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The Apache Commons CSV library provides a simple interface for reading and writing
CSV files of various types.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.csv;
import static org.apache.commons.csv.Constants.BACKSLASH;
import static org.apache.commons.csv.Constants.COMMA;
import static org.apache.commons.csv.Constants.COMMENT;
import static org.apache.commons.csv.Constants.CR;
import static org.apache.commons.csv.Constants.CRLF;
import static org.apache.commons.csv.Constants.DOUBLE_QUOTE_CHAR;
import static org.apache.commons.csv.Constants.EMPTY;
import static org.apache.commons.csv.Constants.LF;
import static org.apache.commons.csv.Constants.PIPE;
import static org.apache.commons.csv.Constants.SP;
import static org.apache.commons.csv.Constants.TAB;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Serializable;
import java.io.StringWriter;
import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/**
* Specifies the format of a CSV file and parses input.
*
* Using predefined formats
*
*
* You can use one of the predefined formats:
*
*
*
* - {@link #DEFAULT}
* - {@link #EXCEL}
* - {@link #INFORMIX_UNLOAD}
* - {@link #INFORMIX_UNLOAD_CSV}
* - {@link #MYSQL}
* - {@link #RFC4180}
* - {@link #ORACLE}
* - {@link #POSTGRESQL_CSV}
* - {@link #POSTGRESQL_TEXT}
* - {@link #TDF}
*
*
*
* For example:
*
*
*
* CSVParser parser = CSVFormat.EXCEL.parse(reader);
*
*
*
* The {@link CSVParser} provides static methods to parse other input types, for example:
*
*
*
* CSVParser parser = CSVParser.parse(file, StandardCharsets.US_ASCII, CSVFormat.EXCEL);
*
*
* Defining formats
*
*
* You can extend a format by calling the {@code with} methods. For example:
*
*
*
* CSVFormat.EXCEL.withNullString("N/A").withIgnoreSurroundingSpaces(true);
*
*
* Defining column names
*
*
* To define the column names you want to use to access records, write:
*
*
*
* CSVFormat.EXCEL.withHeader("Col1", "Col2", "Col3");
*
*
*
* Calling {@link #withHeader(String...)} let's you use the given names to address values in a {@link CSVRecord}, and
* assumes that your CSV source does not contain a first record that also defines column names.
*
* If it does, then you are overriding this metadata with your names and you should skip the first record by calling
* {@link #withSkipHeaderRecord(boolean)} with {@code true}.
*
*
* Parsing
*
*
* You can use a format directly to parse a reader. For example, to parse an Excel file with columns header, write:
*
*
*
* Reader in = ...;
* CSVFormat.EXCEL.withHeader("Col1", "Col2", "Col3").parse(in);
*
*
*
* For other input types, like resources, files, and URLs, use the static methods on {@link CSVParser}.
*
*
* Referencing columns safely
*
*
* If your source contains a header record, you can simplify your code and safely reference columns, by using
* {@link #withHeader(String...)} with no arguments:
*
*
*
* CSVFormat.EXCEL.withHeader();
*
*
*
* This causes the parser to read the first record and use its values as column names.
*
* Then, call one of the {@link CSVRecord} get method that takes a String column name argument:
*
*
*
* String value = record.get("Col1");
*
*
*
* This makes your code impervious to changes in column order in the CSV file.
*
*
* Notes
*
*
* This class is immutable.
*
*/
public final class CSVFormat implements Serializable {
/**
* Predefines formats.
*
* @since 1.2
*/
public enum Predefined {
/**
* @see CSVFormat#DEFAULT
*/
Default(CSVFormat.DEFAULT),
/**
* @see CSVFormat#EXCEL
*/
Excel(CSVFormat.EXCEL),
/**
* @see CSVFormat#INFORMIX_UNLOAD
* @since 1.3
*/
InformixUnload(CSVFormat.INFORMIX_UNLOAD),
/**
* @see CSVFormat#INFORMIX_UNLOAD_CSV
* @since 1.3
*/
InformixUnloadCsv(CSVFormat.INFORMIX_UNLOAD_CSV),
/**
* @see CSVFormat#MONGODB_CSV
* @since 1.7
*/
MongoDBCsv(CSVFormat.MONGODB_CSV),
/**
* @see CSVFormat#MONGODB_TSV
* @since 1.7
*/
MongoDBTsv(CSVFormat.MONGODB_TSV),
/**
* @see CSVFormat#MYSQL
*/
MySQL(CSVFormat.MYSQL),
/**
* @see CSVFormat#ORACLE
*/
Oracle(CSVFormat.ORACLE),
/**
* @see CSVFormat#POSTGRESQL_CSV
* @since 1.5
*/
PostgreSQLCsv(CSVFormat.POSTGRESQL_CSV),
/**
* @see CSVFormat#POSTGRESQL_CSV
*/
PostgreSQLText(CSVFormat.POSTGRESQL_TEXT),
/**
* @see CSVFormat#RFC4180
*/
RFC4180(CSVFormat.RFC4180),
/**
* @see CSVFormat#TDF
*/
TDF(CSVFormat.TDF);
private final CSVFormat format;
Predefined(final CSVFormat format) {
this.format = format;
}
/**
* Gets the format.
*
* @return the format.
*/
public CSVFormat getFormat() {
return format;
}
}
/**
* Standard Comma Separated Value format, as for {@link #RFC4180} but allowing empty lines.
*
*
* Settings are:
*
*
* - {@code withDelimiter(',')}
* - {@code withQuote('"')}
* - {@code withRecordSeparator("\r\n")}
* - {@code withIgnoreEmptyLines(true)}
* - {@code withAllowDuplicateHeaderNames(true)}
*
*
* @see Predefined#Default
*/
public static final CSVFormat DEFAULT = new CSVFormat(COMMA, DOUBLE_QUOTE_CHAR, null, null, null, false, true, CRLF,
null, null, null, false, false, false, false, false, false, true);
/**
* Excel file format (using a comma as the value delimiter). Note that the actual value delimiter used by Excel is
* locale dependent, it might be necessary to customize this format to accommodate to your regional settings.
*
*
* For example for parsing or generating a CSV file on a French system the following format will be used:
*
*
*
* CSVFormat fmt = CSVFormat.EXCEL.withDelimiter(';');
*
*
*
* Settings are:
*
*
* - {@code {@link #withDelimiter(char) withDelimiter(',')}}
* - {@code {@link #withQuote(char) withQuote('"')}}
* - {@code {@link #withRecordSeparator(String) withRecordSeparator("\r\n")}}
* - {@code {@link #withIgnoreEmptyLines(boolean) withIgnoreEmptyLines(false)}}
* - {@code {@link #withAllowMissingColumnNames(boolean) withAllowMissingColumnNames(true)}}
* - {@code {@link #withAllowDuplicateHeaderNames(boolean) withAllowDuplicateHeaderNames(true)}}
*
*
* Note: This is currently like {@link #RFC4180} plus {@link #withAllowMissingColumnNames(boolean)
* withAllowMissingColumnNames(true)} and {@link #withIgnoreEmptyLines(boolean) withIgnoreEmptyLines(false)}.
*
*
* @see Predefined#Excel
*/
// @formatter:off
public static final CSVFormat EXCEL = DEFAULT
.withIgnoreEmptyLines(false)
.withAllowMissingColumnNames();
// @formatter:on
/**
* Default Informix CSV UNLOAD format used by the {@code UNLOAD TO file_name} operation.
*
*
* This is a comma-delimited format with a LF character as the line separator. Values are not quoted and special
* characters are escaped with {@code '\'}. The default NULL string is {@code "\\N"}.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter(',')}
* - {@code withEscape('\\')}
* - {@code withQuote("\"")}
* - {@code withRecordSeparator('\n')}
*
*
* @see Predefined#MySQL
* @see
* http://www.ibm.com/support/knowledgecenter/SSBJG3_2.5.0/com.ibm.gen_busug.doc/c_fgl_InOutSql_UNLOAD.htm
* @since 1.3
*/
// @formatter:off
public static final CSVFormat INFORMIX_UNLOAD = DEFAULT
.withDelimiter(PIPE)
.withEscape(BACKSLASH)
.withQuote(DOUBLE_QUOTE_CHAR)
.withRecordSeparator(LF);
// @formatter:on
/**
* Default Informix CSV UNLOAD format used by the {@code UNLOAD TO file_name} operation (escaping is disabled.)
*
*
* This is a comma-delimited format with a LF character as the line separator. Values are not quoted and special
* characters are escaped with {@code '\'}. The default NULL string is {@code "\\N"}.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter(',')}
* - {@code withQuote("\"")}
* - {@code withRecordSeparator('\n')}
*
*
* @see Predefined#MySQL
* @see
* http://www.ibm.com/support/knowledgecenter/SSBJG3_2.5.0/com.ibm.gen_busug.doc/c_fgl_InOutSql_UNLOAD.htm
* @since 1.3
*/
// @formatter:off
public static final CSVFormat INFORMIX_UNLOAD_CSV = DEFAULT
.withDelimiter(COMMA)
.withQuote(DOUBLE_QUOTE_CHAR)
.withRecordSeparator(LF);
// @formatter:on
/**
* Default MongoDB CSV format used by the {@code mongoexport} operation.
*
* Parsing is not supported yet.
*
*
*
* This is a comma-delimited format. Values are double quoted only if needed and special characters are escaped with
* {@code '"'}. A header line with field names is expected.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter(',')}
* - {@code withEscape('"')}
* - {@code withQuote('"')}
* - {@code withQuoteMode(QuoteMode.ALL_NON_NULL)}
* - {@code withSkipHeaderRecord(false)}
*
*
* @see Predefined#MongoDBCsv
* @see MongoDB mongoexport command
* documentation
* @since 1.7
*/
// @formatter:off
public static final CSVFormat MONGODB_CSV = DEFAULT
.withDelimiter(COMMA)
.withEscape(DOUBLE_QUOTE_CHAR)
.withQuote(DOUBLE_QUOTE_CHAR)
.withQuoteMode(QuoteMode.MINIMAL)
.withSkipHeaderRecord(false);
// @formatter:off
/**
* Default MongoDB TSV format used by the {@code mongoexport} operation.
*
* Parsing is not supported yet.
*
*
*
* This is a tab-delimited format. Values are double quoted only if needed and special
* characters are escaped with {@code '"'}. A header line with field names is expected.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter('\t')}
* - {@code withEscape('"')}
* - {@code withQuote('"')}
* - {@code withQuoteMode(QuoteMode.ALL_NON_NULL)}
* - {@code withSkipHeaderRecord(false)}
*
*
* @see Predefined#MongoDBCsv
* @see MongoDB mongoexport command
* documentation
* @since 1.7
*/
// @formatter:off
public static final CSVFormat MONGODB_TSV = DEFAULT
.withDelimiter(TAB)
.withEscape(DOUBLE_QUOTE_CHAR)
.withQuote(DOUBLE_QUOTE_CHAR)
.withQuoteMode(QuoteMode.MINIMAL)
.withSkipHeaderRecord(false);
// @formatter:off
/**
* Default MySQL format used by the {@code SELECT INTO OUTFILE} and {@code LOAD DATA INFILE} operations.
*
*
* This is a tab-delimited format with a LF character as the line separator. Values are not quoted and special
* characters are escaped with {@code '\'}. The default NULL string is {@code "\\N"}.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter('\t')}
* - {@code withEscape('\\')}
* - {@code withIgnoreEmptyLines(false)}
* - {@code withQuote(null)}
* - {@code withRecordSeparator('\n')}
* - {@code withNullString("\\N")}
* - {@code withQuoteMode(QuoteMode.ALL_NON_NULL)}
*
*
* @see Predefined#MySQL
* @see http://dev.mysql.com/doc/refman/5.1/en/load
* -data.html
*/
// @formatter:off
public static final CSVFormat MYSQL = DEFAULT
.withDelimiter(TAB)
.withEscape(BACKSLASH)
.withIgnoreEmptyLines(false)
.withQuote(null)
.withRecordSeparator(LF)
.withNullString("\\N")
.withQuoteMode(QuoteMode.ALL_NON_NULL);
// @formatter:off
/**
* Default Oracle format used by the SQL*Loader utility.
*
*
* This is a comma-delimited format with the system line separator character as the record separator.Values are
* double quoted when needed and special characters are escaped with {@code '"'}. The default NULL string is
* {@code ""}. Values are trimmed.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter(',') // default is {@code FIELDS TERMINATED BY ','}}
* - {@code withEscape('\\')}
* - {@code withIgnoreEmptyLines(false)}
* - {@code withQuote('"') // default is {@code OPTIONALLY ENCLOSED BY '"'}}
* - {@code withNullString("\\N")}
* - {@code withTrim()}
* - {@code withSystemRecordSeparator()}
* - {@code withQuoteMode(QuoteMode.MINIMAL)}
*
*
* @see Predefined#Oracle
* @see Oracle CSV Format Specification
* @since 1.6
*/
// @formatter:off
public static final CSVFormat ORACLE = DEFAULT
.withDelimiter(COMMA)
.withEscape(BACKSLASH)
.withIgnoreEmptyLines(false)
.withQuote(DOUBLE_QUOTE_CHAR)
.withNullString("\\N")
.withTrim()
.withSystemRecordSeparator()
.withQuoteMode(QuoteMode.MINIMAL);
// @formatter:off
/**
* Default PostgreSQL CSV format used by the {@code COPY} operation.
*
*
* This is a comma-delimited format with a LF character as the line separator. Values are double quoted and special
* characters are escaped with {@code '"'}. The default NULL string is {@code ""}.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter(',')}
* - {@code withEscape('"')}
* - {@code withIgnoreEmptyLines(false)}
* - {@code withQuote('"')}
* - {@code withRecordSeparator('\n')}
* - {@code withNullString("")}
* - {@code withQuoteMode(QuoteMode.ALL_NON_NULL)}
*
*
* @see Predefined#MySQL
* @see PostgreSQL COPY command
* documentation
* @since 1.5
*/
// @formatter:off
public static final CSVFormat POSTGRESQL_CSV = DEFAULT
.withDelimiter(COMMA)
.withEscape(DOUBLE_QUOTE_CHAR)
.withIgnoreEmptyLines(false)
.withQuote(DOUBLE_QUOTE_CHAR)
.withRecordSeparator(LF)
.withNullString(EMPTY)
.withQuoteMode(QuoteMode.ALL_NON_NULL);
// @formatter:off
/**
* Default PostgreSQL text format used by the {@code COPY} operation.
*
*
* This is a tab-delimited format with a LF character as the line separator. Values are double quoted and special
* characters are escaped with {@code '"'}. The default NULL string is {@code "\\N"}.
*
*
*
* Settings are:
*
*
* - {@code withDelimiter('\t')}
* - {@code withEscape('\\')}
* - {@code withIgnoreEmptyLines(false)}
* - {@code withQuote('"')}
* - {@code withRecordSeparator('\n')}
* - {@code withNullString("\\N")}
* - {@code withQuoteMode(QuoteMode.ALL_NON_NULL)}
*
*
* @see Predefined#MySQL
* @see PostgreSQL COPY command
* documentation
* @since 1.5
*/
// @formatter:off
public static final CSVFormat POSTGRESQL_TEXT = DEFAULT
.withDelimiter(TAB)
.withEscape(BACKSLASH)
.withIgnoreEmptyLines(false)
.withQuote(DOUBLE_QUOTE_CHAR)
.withRecordSeparator(LF)
.withNullString("\\N")
.withQuoteMode(QuoteMode.ALL_NON_NULL);
// @formatter:off
/**
* Comma separated format as defined by RFC 4180.
*
*
* Settings are:
*
*
* - {@code withDelimiter(',')}
* - {@code withQuote('"')}
* - {@code withRecordSeparator("\r\n")}
* - {@code withIgnoreEmptyLines(false)}
*
*
* @see Predefined#RFC4180
*/
public static final CSVFormat RFC4180 = DEFAULT.withIgnoreEmptyLines(false);
private static final long serialVersionUID = 1L;
/**
* Tab-delimited format.
*
*
* Settings are:
*
*
* - {@code withDelimiter('\t')}
* - {@code withQuote('"')}
* - {@code withRecordSeparator("\r\n")}
* - {@code withIgnoreSurroundingSpaces(true)}
*
*
* @see Predefined#TDF
*/
// @formatter:off
public static final CSVFormat TDF = DEFAULT
.withDelimiter(TAB)
.withIgnoreSurroundingSpaces();
// @formatter:on
/**
* Returns true if the given character is a line break character.
*
* @param c
* the character to check
*
* @return true if {@code c} is a line break character
*/
private static boolean isLineBreak(final char c) {
return c == LF || c == CR;
}
/**
* Returns true if the given character is a line break character.
*
* @param c
* the character to check, may be null
*
* @return true if {@code c} is a line break character (and not null)
*/
private static boolean isLineBreak(final Character c) {
return c != null && isLineBreak(c.charValue());
}
/**
* Creates a new CSV format with the specified delimiter.
*
*
* Use this method if you want to create a CSVFormat from scratch. All fields but the delimiter will be initialized
* with null/false.
*
*
* @param delimiter
* the char used for value separation, must not be a line break character
* @return a new CSV format.
* @throws IllegalArgumentException
* if the delimiter is a line break character
*
* @see #DEFAULT
* @see #RFC4180
* @see #MYSQL
* @see #EXCEL
* @see #TDF
*/
public static CSVFormat newFormat(final char delimiter) {
return new CSVFormat(delimiter, null, null, null, null, false, false, null, null, null, null, false, false,
false, false, false, false, true);
}
/**
* Gets one of the predefined formats from {@link CSVFormat.Predefined}.
*
* @param format
* name
* @return one of the predefined formats
* @since 1.2
*/
public static CSVFormat valueOf(final String format) {
return CSVFormat.Predefined.valueOf(format).getFormat();
}
private final boolean allowDuplicateHeaderNames;
private final boolean allowMissingColumnNames;
private final boolean autoFlush;
private final Character commentMarker; // null if commenting is disabled
private final char delimiter;
private final Character escapeCharacter; // null if escaping is disabled
private final String[] header; // array of header column names
private final String[] headerComments; // array of header comment lines
private final boolean ignoreEmptyLines;
private final boolean ignoreHeaderCase; // should ignore header names case
private final boolean ignoreSurroundingSpaces; // Should leading/trailing spaces be ignored around values?
private final String nullString; // the string to be used for null values
private final Character quoteCharacter; // null if quoting is disabled
private final String quotedNullString;
private final QuoteMode quoteMode;
private final String recordSeparator; // for outputs
private final boolean skipHeaderRecord;
private final boolean trailingDelimiter;
private final boolean trim;
/**
* Creates a customized CSV format.
*
* @param delimiter
* the char used for value separation, must not be a line break character
* @param quoteChar
* the Character used as value encapsulation marker, may be {@code null} to disable
* @param quoteMode
* the quote mode
* @param commentStart
* the Character used for comment identification, may be {@code null} to disable
* @param escape
* the Character used to escape special characters in values, may be {@code null} to disable
* @param ignoreSurroundingSpaces
* {@code true} when whitespaces enclosing values should be ignored
* @param ignoreEmptyLines
* {@code true} when the parser should skip empty lines
* @param recordSeparator
* the line separator to use for output
* @param nullString
* the line separator to use for output
* @param headerComments
* the comments to be printed by the Printer before the actual CSV data
* @param header
* the header
* @param skipHeaderRecord
* TODO
* @param allowMissingColumnNames
* TODO
* @param ignoreHeaderCase
* TODO
* @param trim
* TODO
* @param trailingDelimiter
* TODO
* @param autoFlush
* @throws IllegalArgumentException
* if the delimiter is a line break character
*/
private CSVFormat(final char delimiter, final Character quoteChar, final QuoteMode quoteMode,
final Character commentStart, final Character escape, final boolean ignoreSurroundingSpaces,
final boolean ignoreEmptyLines, final String recordSeparator, final String nullString,
final Object[] headerComments, final String[] header, final boolean skipHeaderRecord,
final boolean allowMissingColumnNames, final boolean ignoreHeaderCase, final boolean trim,
final boolean trailingDelimiter, final boolean autoFlush, final boolean allowDuplicateHeaderNames) {
this.delimiter = delimiter;
this.quoteCharacter = quoteChar;
this.quoteMode = quoteMode;
this.commentMarker = commentStart;
this.escapeCharacter = escape;
this.ignoreSurroundingSpaces = ignoreSurroundingSpaces;
this.allowMissingColumnNames = allowMissingColumnNames;
this.ignoreEmptyLines = ignoreEmptyLines;
this.recordSeparator = recordSeparator;
this.nullString = nullString;
this.headerComments = toStringArray(headerComments);
this.header = header == null ? null : header.clone();
this.skipHeaderRecord = skipHeaderRecord;
this.ignoreHeaderCase = ignoreHeaderCase;
this.trailingDelimiter = trailingDelimiter;
this.trim = trim;
this.autoFlush = autoFlush;
this.quotedNullString = quoteCharacter + nullString + quoteCharacter;
this.allowDuplicateHeaderNames = allowDuplicateHeaderNames;
validate();
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final CSVFormat other = (CSVFormat) obj;
if (delimiter != other.delimiter) {
return false;
}
if (trailingDelimiter != other.trailingDelimiter) {
return false;
}
if (autoFlush != other.autoFlush) {
return false;
}
if (trim != other.trim) {
return false;
}
if (allowMissingColumnNames != other.allowMissingColumnNames) {
return false;
}
if (allowDuplicateHeaderNames != other.allowDuplicateHeaderNames) {
return false;
}
if (ignoreHeaderCase != other.ignoreHeaderCase) {
return false;
}
if (quoteMode != other.quoteMode) {
return false;
}
if (quoteCharacter == null) {
if (other.quoteCharacter != null) {
return false;
}
} else if (!quoteCharacter.equals(other.quoteCharacter)) {
return false;
}
if (commentMarker == null) {
if (other.commentMarker != null) {
return false;
}
} else if (!commentMarker.equals(other.commentMarker)) {
return false;
}
if (escapeCharacter == null) {
if (other.escapeCharacter != null) {
return false;
}
} else if (!escapeCharacter.equals(other.escapeCharacter)) {
return false;
}
if (nullString == null) {
if (other.nullString != null) {
return false;
}
} else if (!nullString.equals(other.nullString)) {
return false;
}
if (!Arrays.equals(header, other.header)) {
return false;
}
if (ignoreSurroundingSpaces != other.ignoreSurroundingSpaces) {
return false;
}
if (ignoreEmptyLines != other.ignoreEmptyLines) {
return false;
}
if (skipHeaderRecord != other.skipHeaderRecord) {
return false;
}
if (recordSeparator == null) {
if (other.recordSeparator != null) {
return false;
}
} else if (!recordSeparator.equals(other.recordSeparator)) {
return false;
}
if (!Arrays.equals(headerComments, other.headerComments)) {
return false;
}
return true;
}
/**
* Formats the specified values.
*
* @param values
* the values to format
* @return the formatted values
*/
public String format(final Object... values) {
final StringWriter out = new StringWriter();
try (CSVPrinter csvPrinter = new CSVPrinter(out, this)) {
csvPrinter.printRecord(values);
return out.toString().trim();
} catch (final IOException e) {
// should not happen because a StringWriter does not do IO.
throw new IllegalStateException(e);
}
}
/**
* Returns true if and only if duplicate names are allowed in the headers.
*
* @return whether duplicate header names are allowed
* @since 1.7
*/
public boolean getAllowDuplicateHeaderNames() {
return allowDuplicateHeaderNames;
}
/**
* Specifies whether missing column names are allowed when parsing the header line.
*
* @return {@code true} if missing column names are allowed when parsing the header line, {@code false} to throw an
* {@link IllegalArgumentException}.
*/
public boolean getAllowMissingColumnNames() {
return allowMissingColumnNames;
}
/**
* Returns whether to flush on close.
*
* @return whether to flush on close.
* @since 1.6
*/
public boolean getAutoFlush() {
return autoFlush;
}
/**
* Returns the character marking the start of a line comment.
*
* @return the comment start marker, may be {@code null}
*/
public Character getCommentMarker() {
return commentMarker;
}
/**
* Returns the character delimiting the values (typically ';', ',' or '\t').
*
* @return the delimiter character
*/
public char getDelimiter() {
return delimiter;
}
/**
* Returns the escape character.
*
* @return the escape character, may be {@code null}
*/
public Character getEscapeCharacter() {
return escapeCharacter;
}
/**
* Returns a copy of the header array.
*
* @return a copy of the header array; {@code null} if disabled, the empty array if to be read from the file
*/
public String[] getHeader() {
return header != null ? header.clone() : null;
}
/**
* Returns a copy of the header comment array.
*
* @return a copy of the header comment array; {@code null} if disabled.
*/
public String[] getHeaderComments() {
return headerComments != null ? headerComments.clone() : null;
}
/**
* Specifies whether empty lines between records are ignored when parsing input.
*
* @return {@code true} if empty lines between records are ignored, {@code false} if they are turned into empty
* records.
*/
public boolean getIgnoreEmptyLines() {
return ignoreEmptyLines;
}
/**
* Specifies whether header names will be accessed ignoring case.
*
* @return {@code true} if header names cases are ignored, {@code false} if they are case sensitive.
* @since 1.3
*/
public boolean getIgnoreHeaderCase() {
return ignoreHeaderCase;
}
/**
* Specifies whether spaces around values are ignored when parsing input.
*
* @return {@code true} if spaces around values are ignored, {@code false} if they are treated as part of the value.
*/
public boolean getIgnoreSurroundingSpaces() {
return ignoreSurroundingSpaces;
}
/**
* Gets the String to convert to and from {@code null}.
*
* - Reading: Converts strings equal to the given {@code nullString} to {@code null} when reading
* records.
* - Writing: Writes {@code null} as the given {@code nullString} when writing records.
*
*
* @return the String to convert to and from {@code null}. No substitution occurs if {@code null}
*/
public String getNullString() {
return nullString;
}
/**
* Returns the character used to encapsulate values containing special characters.
*
* @return the quoteChar character, may be {@code null}
*/
public Character getQuoteCharacter() {
return quoteCharacter;
}
/**
* Returns the quote policy output fields.
*
* @return the quote policy
*/
public QuoteMode getQuoteMode() {
return quoteMode;
}
/**
* Returns the record separator delimiting output records.
*
* @return the record separator
*/
public String getRecordSeparator() {
return recordSeparator;
}
/**
* Returns whether to skip the header record.
*
* @return whether to skip the header record.
*/
public boolean getSkipHeaderRecord() {
return skipHeaderRecord;
}
/**
* Returns whether to add a trailing delimiter.
*
* @return whether to add a trailing delimiter.
* @since 1.3
*/
public boolean getTrailingDelimiter() {
return trailingDelimiter;
}
/**
* Returns whether to trim leading and trailing blanks.
* This is used by {@link #print(Object, Appendable, boolean)}
* Also by {@link CSVParser#addRecordValue(boolean)}
*
* @return whether to trim leading and trailing blanks.
*/
public boolean getTrim() {
return trim;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + delimiter;
result = prime * result + ((quoteMode == null) ? 0 : quoteMode.hashCode());
result = prime * result + ((quoteCharacter == null) ? 0 : quoteCharacter.hashCode());
result = prime * result + ((commentMarker == null) ? 0 : commentMarker.hashCode());
result = prime * result + ((escapeCharacter == null) ? 0 : escapeCharacter.hashCode());
result = prime * result + ((nullString == null) ? 0 : nullString.hashCode());
result = prime * result + (ignoreSurroundingSpaces ? 1231 : 1237);
result = prime * result + (ignoreHeaderCase ? 1231 : 1237);
result = prime * result + (ignoreEmptyLines ? 1231 : 1237);
result = prime * result + (skipHeaderRecord ? 1231 : 1237);
result = prime * result + (allowDuplicateHeaderNames ? 1231 : 1237);
result = prime * result + (trim ? 1231 : 1237);
result = prime * result + (autoFlush ? 1231 : 1237);
result = prime * result + (trailingDelimiter ? 1231 : 1237);
result = prime * result + (allowMissingColumnNames ? 1231 : 1237);
result = prime * result + ((recordSeparator == null) ? 0 : recordSeparator.hashCode());
result = prime * result + Arrays.hashCode(header);
result = prime * result + Arrays.hashCode(headerComments);
return result;
}
/**
* Specifies whether comments are supported by this format.
*
* Note that the comment introducer character is only recognized at the start of a line.
*
* @return {@code true} is comments are supported, {@code false} otherwise
*/
public boolean isCommentMarkerSet() {
return commentMarker != null;
}
/**
* Returns whether escape are being processed.
*
* @return {@code true} if escapes are processed
*/
public boolean isEscapeCharacterSet() {
return escapeCharacter != null;
}
/**
* Returns whether a nullString has been defined.
*
* @return {@code true} if a nullString is defined
*/
public boolean isNullStringSet() {
return nullString != null;
}
/**
* Returns whether a quoteChar has been defined.
*
* @return {@code true} if a quoteChar is defined
*/
public boolean isQuoteCharacterSet() {
return quoteCharacter != null;
}
/**
* Parses the specified content.
*
*
* See also the various static parse methods on {@link CSVParser}.
*
*
* @param in
* the input stream
* @return a parser over a stream of {@link CSVRecord}s.
* @throws IOException
* If an I/O error occurs
*/
public CSVParser parse(final Reader in) throws IOException {
return new CSVParser(in, this);
}
/**
* Prints to the specified output.
*
*
* See also {@link CSVPrinter}.
*
*
* @param out
* the output.
* @return a printer to an output.
* @throws IOException
* thrown if the optional header cannot be printed.
*/
public CSVPrinter print(final Appendable out) throws IOException {
return new CSVPrinter(out, this);
}
/**
* Prints to the specified output.
*
*
* See also {@link CSVPrinter}.
*
*
* @param out
* the output.
* @param charset
* A charset.
* @return a printer to an output.
* @throws IOException
* thrown if the optional header cannot be printed.
* @since 1.5
*/
@SuppressWarnings("resource")
public CSVPrinter print(final File out, final Charset charset) throws IOException {
// The writer will be closed when close() is called.
return new CSVPrinter(new OutputStreamWriter(new FileOutputStream(out), charset), this);
}
/**
* Prints the {@code value} as the next value on the line to {@code out}. The value will be escaped or encapsulated
* as needed. Useful when one wants to avoid creating CSVPrinters.
* Trims the value if {@link #getTrim()} is true
* @param value
* value to output.
* @param out
* where to print the value.
* @param newRecord
* if this a new record.
* @throws IOException
* If an I/O error occurs.
* @since 1.4
*/
public void print(final Object value, final Appendable out, final boolean newRecord) throws IOException {
// null values are considered empty
// Only call CharSequence.toString() if you have to, helps GC-free use cases.
CharSequence charSequence;
if (value == null) {
// https://issues.apache.org/jira/browse/CSV-203
if (null == nullString) {
charSequence = EMPTY;
} else {
if (QuoteMode.ALL == quoteMode) {
charSequence = quotedNullString;
} else {
charSequence = nullString;
}
}
} else {
if (value instanceof CharSequence) {
charSequence = (CharSequence) value;
} else if (value instanceof Reader) {
print((Reader) value, out, newRecord);
return;
} else {
charSequence = value.toString();
}
}
charSequence = getTrim() ? trim(charSequence) : charSequence;
print(value, charSequence, out, newRecord);
}
private void print(final Object object, final CharSequence value, final Appendable out, final boolean newRecord)
throws IOException {
final int offset = 0;
final int len = value.length();
if (!newRecord) {
out.append(getDelimiter());
}
if (object == null) {
out.append(value);
} else if (isQuoteCharacterSet()) {
// the original object is needed so can check for Number
printWithQuotes(object, value, out, newRecord);
} else if (isEscapeCharacterSet()) {
printWithEscapes(value, out);
} else {
out.append(value, offset, len);
}
}
/**
* Prints to the specified output.
*
*
* See also {@link CSVPrinter}.
*
*
* @param out
* the output.
* @param charset
* A charset.
* @return a printer to an output.
* @throws IOException
* thrown if the optional header cannot be printed.
* @since 1.5
*/
public CSVPrinter print(final Path out, final Charset charset) throws IOException {
return print(Files.newBufferedWriter(out, charset));
}
private void print(final Reader reader, final Appendable out, final boolean newRecord) throws IOException {
// Reader is never null
if (!newRecord) {
out.append(getDelimiter());
}
if (isQuoteCharacterSet()) {
printWithQuotes(reader, out);
} else if (isEscapeCharacterSet()) {
printWithEscapes(reader, out);
} else if (out instanceof Writer) {
IOUtils.copyLarge(reader, (Writer) out);
} else {
IOUtils.copy(reader, out);
}
}
/**
* Prints to the {@link System#out}.
*
*
* See also {@link CSVPrinter}.
*
*
* @return a printer to {@link System#out}.
* @throws IOException
* thrown if the optional header cannot be printed.
* @since 1.5
*/
public CSVPrinter printer() throws IOException {
return new CSVPrinter(System.out, this);
}
/**
* Outputs the trailing delimiter (if set) followed by the record separator (if set).
*
* @param out
* where to write
* @throws IOException
* If an I/O error occurs
* @since 1.4
*/
public void println(final Appendable out) throws IOException {
if (getTrailingDelimiter()) {
out.append(getDelimiter());
}
if (recordSeparator != null) {
out.append(recordSeparator);
}
}
/**
* Prints the given {@code values} to {@code out} as a single record of delimiter separated values followed by the
* record separator.
*
*
* The values will be quoted if needed. Quotes and new-line characters will be escaped. This method adds the record
* separator to the output after printing the record, so there is no need to call {@link #println(Appendable)}.
*
*
* @param out
* where to write.
* @param values
* values to output.
* @throws IOException
* If an I/O error occurs.
* @since 1.4
*/
public void printRecord(final Appendable out, final Object... values) throws IOException {
for (int i = 0; i < values.length; i++) {
print(values[i], out, i == 0);
}
println(out);
}
/*
* Note: must only be called if escaping is enabled, otherwise will generate NPE
*/
private void printWithEscapes(final CharSequence value, final Appendable out) throws IOException {
int start = 0;
int pos = 0;
final int len = value.length();
final int end = len;
final char delim = getDelimiter();
final char escape = getEscapeCharacter().charValue();
while (pos < end) {
char c = value.charAt(pos);
if (c == CR || c == LF || c == delim || c == escape) {
// write out segment up until this char
if (pos > start) {
out.append(value, start, pos);
}
if (c == LF) {
c = 'n';
} else if (c == CR) {
c = 'r';
}
out.append(escape);
out.append(c);
start = pos + 1; // start on the current char after this one
}
pos++;
}
// write last segment
if (pos > start) {
out.append(value, start, pos);
}
}
private void printWithEscapes(final Reader reader, final Appendable out) throws IOException {
int start = 0;
int pos = 0;
final char delim = getDelimiter();
final char escape = getEscapeCharacter().charValue();
final StringBuilder builder = new StringBuilder(IOUtils.DEFAULT_BUFFER_SIZE);
int c;
while (-1 != (c = reader.read())) {
builder.append((char) c);
if (c == CR || c == LF || c == delim || c == escape) {
// write out segment up until this char
if (pos > start) {
out.append(builder.substring(start, pos));
builder.setLength(0);
}
if (c == LF) {
c = 'n';
} else if (c == CR) {
c = 'r';
}
out.append(escape);
out.append((char) c);
start = pos + 1; // start on the current char after this one
}
pos++;
}
// write last segment
if (pos > start) {
out.append(builder.substring(start, pos));
}
}
/*
* Note: must only be called if quoting is enabled, otherwise will generate NPE
*/
// the original object is needed so can check for Number
private void printWithQuotes(final Object object, final CharSequence value, final Appendable out,
final boolean newRecord) throws IOException {
boolean quote = false;
int start = 0;
int pos = 0;
final int len = value.length();
final int end = len;
final char delimChar = getDelimiter();
final char quoteChar = getQuoteCharacter().charValue();
// If escape char not specified, default to the quote char
// This avoids having to keep checking whether there is an escape character
// at the cost of checking against quote twice
final char escapeChar = isEscapeCharacterSet() ? getEscapeCharacter().charValue() : quoteChar;
QuoteMode quoteModePolicy = getQuoteMode();
if (quoteModePolicy == null) {
quoteModePolicy = QuoteMode.MINIMAL;
}
switch (quoteModePolicy) {
case ALL:
case ALL_NON_NULL:
quote = true;
break;
case NON_NUMERIC:
quote = !(object instanceof Number);
break;
case NONE:
// Use the existing escaping code
printWithEscapes(value, out);
return;
case MINIMAL:
if (len <= 0) {
// always quote an empty token that is the first
// on the line, as it may be the only thing on the
// line. If it were not quoted in that case,
// an empty line has no tokens.
if (newRecord) {
quote = true;
}
} else {
char c = value.charAt(pos);
if (c <= COMMENT) {
// Some other chars at the start of a value caused the parser to fail, so for now
// encapsulate if we start in anything less than '#'. We are being conservative
// by including the default comment char too.
quote = true;
} else {
while (pos < end) {
c = value.charAt(pos);
if (c == LF || c == CR || c == quoteChar || c == delimChar || c == escapeChar) {
quote = true;
break;
}
pos++;
}
if (!quote) {
pos = end - 1;
c = value.charAt(pos);
// Some other chars at the end caused the parser to fail, so for now
// encapsulate if we end in anything less than ' '
if (c <= SP) {
quote = true;
}
}
}
}
if (!quote) {
// no encapsulation needed - write out the original value
out.append(value, start, end);
return;
}
break;
default:
throw new IllegalStateException("Unexpected Quote value: " + quoteModePolicy);
}
if (!quote) {
// no encapsulation needed - write out the original value
out.append(value, start, end);
return;
}
// we hit something that needed encapsulation
out.append(quoteChar);
// Pick up where we left off: pos should be positioned on the first character that caused
// the need for encapsulation.
while (pos < end) {
final char c = value.charAt(pos);
if (c == quoteChar || c == escapeChar) {
// write out the chunk up until this point
out.append(value, start, pos);
out.append(escapeChar); // now output the escape
start = pos; // and restart with the matched char
}
pos++;
}
// write the last segment
out.append(value, start, pos);
out.append(quoteChar);
}
/**
* Always use quotes unless QuoteMode is NONE, so we not have to look ahead.
*
* @throws IOException
*/
private void printWithQuotes(final Reader reader, final Appendable out) throws IOException {
if (getQuoteMode() == QuoteMode.NONE) {
printWithEscapes(reader, out);
return;
}
int pos = 0;
final char quote = getQuoteCharacter().charValue();
final StringBuilder builder = new StringBuilder(IOUtils.DEFAULT_BUFFER_SIZE);
out.append(quote);
int c;
while (-1 != (c = reader.read())) {
builder.append((char) c);
if (c == quote) {
// write out segment up until this char
if (pos > 0) {
out.append(builder.substring(0, pos));
builder.setLength(0);
pos = -1;
}
out.append(quote);
out.append((char) c);
}
pos++;
}
// write last segment
if (pos > 0) {
out.append(builder.substring(0, pos));
}
out.append(quote);
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("Delimiter=<").append(delimiter).append('>');
if (isEscapeCharacterSet()) {
sb.append(' ');
sb.append("Escape=<").append(escapeCharacter).append('>');
}
if (isQuoteCharacterSet()) {
sb.append(' ');
sb.append("QuoteChar=<").append(quoteCharacter).append('>');
}
if (quoteMode != null) {
sb.append(' ');
sb.append("QuoteMode=<").append(quoteMode).append('>');
}
if (isCommentMarkerSet()) {
sb.append(' ');
sb.append("CommentStart=<").append(commentMarker).append('>');
}
if (isNullStringSet()) {
sb.append(' ');
sb.append("NullString=<").append(nullString).append('>');
}
if (recordSeparator != null) {
sb.append(' ');
sb.append("RecordSeparator=<").append(recordSeparator).append('>');
}
if (getIgnoreEmptyLines()) {
sb.append(" EmptyLines:ignored");
}
if (getIgnoreSurroundingSpaces()) {
sb.append(" SurroundingSpaces:ignored");
}
if (getIgnoreHeaderCase()) {
sb.append(" IgnoreHeaderCase:ignored");
}
sb.append(" SkipHeaderRecord:").append(skipHeaderRecord);
if (headerComments != null) {
sb.append(' ');
sb.append("HeaderComments:").append(Arrays.toString(headerComments));
}
if (header != null) {
sb.append(' ');
sb.append("Header:").append(Arrays.toString(header));
}
return sb.toString();
}
private String[] toStringArray(final Object[] values) {
if (values == null) {
return null;
}
final String[] strings = new String[values.length];
for (int i = 0; i < values.length; i++) {
final Object value = values[i];
strings[i] = value == null ? null : value.toString();
}
return strings;
}
private CharSequence trim(final CharSequence charSequence) {
if (charSequence instanceof String) {
return ((String) charSequence).trim();
}
final int count = charSequence.length();
int len = count;
int pos = 0;
while (pos < len && charSequence.charAt(pos) <= SP) {
pos++;
}
while (pos < len && charSequence.charAt(len - 1) <= SP) {
len--;
}
return pos > 0 || len < count ? charSequence.subSequence(pos, len) : charSequence;
}
/**
* Verifies the consistency of the parameters and throws an IllegalArgumentException if necessary.
*
* @throws IllegalArgumentException
*/
private void validate() throws IllegalArgumentException {
if (isLineBreak(delimiter)) {
throw new IllegalArgumentException("The delimiter cannot be a line break");
}
if (quoteCharacter != null && delimiter == quoteCharacter.charValue()) {
throw new IllegalArgumentException(
"The quoteChar character and the delimiter cannot be the same ('" + quoteCharacter + "')");
}
if (escapeCharacter != null && delimiter == escapeCharacter.charValue()) {
throw new IllegalArgumentException(
"The escape character and the delimiter cannot be the same ('" + escapeCharacter + "')");
}
if (commentMarker != null && delimiter == commentMarker.charValue()) {
throw new IllegalArgumentException(
"The comment start character and the delimiter cannot be the same ('" + commentMarker + "')");
}
if (quoteCharacter != null && quoteCharacter.equals(commentMarker)) {
throw new IllegalArgumentException(
"The comment start character and the quoteChar cannot be the same ('" + commentMarker + "')");
}
if (escapeCharacter != null && escapeCharacter.equals(commentMarker)) {
throw new IllegalArgumentException(
"The comment start and the escape character cannot be the same ('" + commentMarker + "')");
}
if (escapeCharacter == null && quoteMode == QuoteMode.NONE) {
throw new IllegalArgumentException("No quotes mode set but no escape character is set");
}
// validate header
if (header != null && !allowDuplicateHeaderNames) {
final Set dupCheck = new HashSet<>();
for (final String hdr : header) {
if (!dupCheck.add(hdr)) {
throw new IllegalArgumentException(
"The header contains a duplicate entry: '" + hdr + "' in " + Arrays.toString(header));
}
}
}
}
/**
* Returns a new {@code CSVFormat} that allows duplicate header names.
*
* @return a new {@code CSVFormat} that allows duplicate header names
* @since 1.7
*/
public CSVFormat withAllowDuplicateHeaderNames() {
return withAllowDuplicateHeaderNames(true);
}
/**
* Returns a new {@code CSVFormat} with duplicate header names behavior set to the given value.
*
* @param allowDuplicateHeaderNames the duplicate header names behavior, true to allow, false to disallow.
* @return a new {@code CSVFormat} with duplicate header names behavior set to the given value.
* @since 1.7
*/
public CSVFormat withAllowDuplicateHeaderNames(final boolean allowDuplicateHeaderNames) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the missing column names behavior of the format set to {@code true}
*
* @return A new CSVFormat that is equal to this but with the specified missing column names behavior.
* @see #withAllowMissingColumnNames(boolean)
* @since 1.1
*/
public CSVFormat withAllowMissingColumnNames() {
return this.withAllowMissingColumnNames(true);
}
/**
* Returns a new {@code CSVFormat} with the missing column names behavior of the format set to the given value.
*
* @param allowMissingColumnNames
* the missing column names behavior, {@code true} to allow missing column names in the header line,
* {@code false} to cause an {@link IllegalArgumentException} to be thrown.
* @return A new CSVFormat that is equal to this but with the specified missing column names behavior.
*/
public CSVFormat withAllowMissingColumnNames(final boolean allowMissingColumnNames) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with whether to flush on close.
*
* @param autoFlush
* whether to flush on close.
*
* @return A new CSVFormat that is equal to this but with the specified autoFlush setting.
* @since 1.6
*/
public CSVFormat withAutoFlush(final boolean autoFlush) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the comment start marker of the format set to the specified character.
*
* Note that the comment start character is only recognized at the start of a line.
*
* @param commentMarker
* the comment start marker
* @return A new CSVFormat that is equal to this one but with the specified character as the comment start marker
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withCommentMarker(final char commentMarker) {
return withCommentMarker(Character.valueOf(commentMarker));
}
/**
* Returns a new {@code CSVFormat} with the comment start marker of the format set to the specified character.
*
* Note that the comment start character is only recognized at the start of a line.
*
* @param commentMarker
* the comment start marker, use {@code null} to disable
* @return A new CSVFormat that is equal to this one but with the specified character as the comment start marker
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withCommentMarker(final Character commentMarker) {
if (isLineBreak(commentMarker)) {
throw new IllegalArgumentException("The comment start marker character cannot be a line break");
}
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the delimiter of the format set to the specified character.
*
* @param delimiter
* the delimiter character
* @return A new CSVFormat that is equal to this with the specified character as delimiter
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withDelimiter(final char delimiter) {
if (isLineBreak(delimiter)) {
throw new IllegalArgumentException("The delimiter cannot be a line break");
}
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the escape character of the format set to the specified character.
*
* @param escape
* the escape character
* @return A new CSVFormat that is equal to his but with the specified character as the escape character
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withEscape(final char escape) {
return withEscape(Character.valueOf(escape));
}
/**
* Returns a new {@code CSVFormat} with the escape character of the format set to the specified character.
*
* @param escape
* the escape character, use {@code null} to disable
* @return A new CSVFormat that is equal to this but with the specified character as the escape character
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withEscape(final Character escape) {
if (isLineBreak(escape)) {
throw new IllegalArgumentException("The escape character cannot be a line break");
}
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escape, ignoreSurroundingSpaces,
ignoreEmptyLines, recordSeparator, nullString, headerComments, header, skipHeaderRecord,
allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} using the first record as header.
*
*
* Calling this method is equivalent to calling:
*
*
*
* CSVFormat format = aFormat.withHeader().withSkipHeaderRecord();
*
*
* @return A new CSVFormat that is equal to this but using the first record as header.
* @see #withSkipHeaderRecord(boolean)
* @see #withHeader(String...)
* @since 1.3
*/
public CSVFormat withFirstRecordAsHeader() {
return withHeader().withSkipHeaderRecord();
}
/**
* Returns a new {@code CSVFormat} with the header of the format defined by the enum class.
*
*
* Example:
*
*
*
* public enum Header {
* Name, Email, Phone
* }
*
* CSVFormat format = aformat.withHeader(Header.class);
*
*
* The header is also used by the {@link CSVPrinter}.
*
*
* @param headerEnum
* the enum defining the header, {@code null} if disabled, empty if parsed automatically, user specified
* otherwise.
*
* @return A new CSVFormat that is equal to this but with the specified header
* @see #withHeader(String...)
* @see #withSkipHeaderRecord(boolean)
* @since 1.3
*/
public CSVFormat withHeader(final Class> headerEnum) {
String[] header = null;
if (headerEnum != null) {
final Enum[] enumValues = headerEnum.getEnumConstants();
header = new String[enumValues.length];
for (int i = 0; i < enumValues.length; i++) {
header[i] = enumValues[i].name();
}
}
return withHeader(header);
}
/**
* Returns a new {@code CSVFormat} with the header of the format set from the result set metadata. The header can
* either be parsed automatically from the input file with:
*
*
* CSVFormat format = aformat.withHeader();
*
*
* or specified manually with:
*
*
* CSVFormat format = aformat.withHeader(resultSet);
*
*
* The header is also used by the {@link CSVPrinter}.
*
*
* @param resultSet
* the resultSet for the header, {@code null} if disabled, empty if parsed automatically, user specified
* otherwise.
*
* @return A new CSVFormat that is equal to this but with the specified header
* @throws SQLException
* SQLException if a database access error occurs or this method is called on a closed result set.
* @since 1.1
*/
public CSVFormat withHeader(final ResultSet resultSet) throws SQLException {
return withHeader(resultSet != null ? resultSet.getMetaData() : null);
}
/**
* Returns a new {@code CSVFormat} with the header of the format set from the result set metadata. The header can
* either be parsed automatically from the input file with:
*
*
* CSVFormat format = aformat.withHeader();
*
*
* or specified manually with:
*
*
* CSVFormat format = aformat.withHeader(metaData);
*
*
* The header is also used by the {@link CSVPrinter}.
*
*
* @param metaData
* the metaData for the header, {@code null} if disabled, empty if parsed automatically, user specified
* otherwise.
*
* @return A new CSVFormat that is equal to this but with the specified header
* @throws SQLException
* SQLException if a database access error occurs or this method is called on a closed result set.
* @since 1.1
*/
public CSVFormat withHeader(final ResultSetMetaData metaData) throws SQLException {
String[] labels = null;
if (metaData != null) {
final int columnCount = metaData.getColumnCount();
labels = new String[columnCount];
for (int i = 0; i < columnCount; i++) {
labels[i] = metaData.getColumnLabel(i + 1);
}
}
return withHeader(labels);
}
/**
* Returns a new {@code CSVFormat} with the header of the format set to the given values. The header can either be
* parsed automatically from the input file with:
*
*
* CSVFormat format = aformat.withHeader();
*
*
* or specified manually with:
*
*
* CSVFormat format = aformat.withHeader("name", "email", "phone");
*
*
* The header is also used by the {@link CSVPrinter}.
*
*
* @param header
* the header, {@code null} if disabled, empty if parsed automatically, user specified otherwise.
*
* @return A new CSVFormat that is equal to this but with the specified header
* @see #withSkipHeaderRecord(boolean)
*/
public CSVFormat withHeader(final String... header) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the header comments of the format set to the given values. The comments will
* be printed first, before the headers. This setting is ignored by the parser.
*
*
* CSVFormat format = aformat.withHeaderComments("Generated by Apache Commons CSV 1.1.", new Date());
*
*
* @param headerComments
* the headerComments which will be printed by the Printer before the actual CSV data.
*
* @return A new CSVFormat that is equal to this but with the specified header
* @see #withSkipHeaderRecord(boolean)
* @since 1.1
*/
public CSVFormat withHeaderComments(final Object... headerComments) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the empty line skipping behavior of the format set to {@code true}.
*
* @return A new CSVFormat that is equal to this but with the specified empty line skipping behavior.
* @since {@link #withIgnoreEmptyLines(boolean)}
* @since 1.1
*/
public CSVFormat withIgnoreEmptyLines() {
return this.withIgnoreEmptyLines(true);
}
/**
* Returns a new {@code CSVFormat} with the empty line skipping behavior of the format set to the given value.
*
* @param ignoreEmptyLines
* the empty line skipping behavior, {@code true} to ignore the empty lines between the records,
* {@code false} to translate empty lines to empty records.
* @return A new CSVFormat that is equal to this but with the specified empty line skipping behavior.
*/
public CSVFormat withIgnoreEmptyLines(final boolean ignoreEmptyLines) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the header ignore case behavior set to {@code true}.
*
* @return A new CSVFormat that will ignore case header name.
* @see #withIgnoreHeaderCase(boolean)
* @since 1.3
*/
public CSVFormat withIgnoreHeaderCase() {
return this.withIgnoreHeaderCase(true);
}
/**
* Returns a new {@code CSVFormat} with whether header names should be accessed ignoring case.
*
* @param ignoreHeaderCase
* the case mapping behavior, {@code true} to access name/values, {@code false} to leave the mapping as
* is.
* @return A new CSVFormat that will ignore case header name if specified as {@code true}
* @since 1.3
*/
public CSVFormat withIgnoreHeaderCase(final boolean ignoreHeaderCase) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the parser trimming behavior of the format set to {@code true}.
*
* @return A new CSVFormat that is equal to this but with the specified parser trimming behavior.
* @see #withIgnoreSurroundingSpaces(boolean)
* @since 1.1
*/
public CSVFormat withIgnoreSurroundingSpaces() {
return this.withIgnoreSurroundingSpaces(true);
}
/**
* Returns a new {@code CSVFormat} with the parser trimming behavior of the format set to the given value.
*
* @param ignoreSurroundingSpaces the parser trimming behavior, {@code true} to remove the surrounding spaces,
* {@code false} to leave the spaces as is.
* @return A new CSVFormat that is equal to this but with the specified trimming behavior.
*/
public CSVFormat withIgnoreSurroundingSpaces(final boolean ignoreSurroundingSpaces) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with conversions to and from null for strings on input and output.
*
* - Reading: Converts strings equal to the given {@code nullString} to {@code null} when reading
* records.
* - Writing: Writes {@code null} as the given {@code nullString} when writing records.
*
*
* @param nullString
* the String to convert to and from {@code null}. No substitution occurs if {@code null}
*
* @return A new CSVFormat that is equal to this but with the specified null conversion string.
*/
public CSVFormat withNullString(final String nullString) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the quoteChar of the format set to the specified character.
*
* @param quoteChar
* the quoteChar character
* @return A new CSVFormat that is equal to this but with the specified character as quoteChar
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withQuote(final char quoteChar) {
return withQuote(Character.valueOf(quoteChar));
}
/**
* Returns a new {@code CSVFormat} with the quoteChar of the format set to the specified character.
*
* @param quoteChar
* the quoteChar character, use {@code null} to disable
* @return A new CSVFormat that is equal to this but with the specified character as quoteChar
* @throws IllegalArgumentException
* thrown if the specified character is a line break
*/
public CSVFormat withQuote(final Character quoteChar) {
if (isLineBreak(quoteChar)) {
throw new IllegalArgumentException("The quoteChar cannot be a line break");
}
return new CSVFormat(delimiter, quoteChar, quoteMode, commentMarker, escapeCharacter, ignoreSurroundingSpaces,
ignoreEmptyLines, recordSeparator, nullString, headerComments, header, skipHeaderRecord,
allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the output quote policy of the format set to the specified value.
*
* @param quoteModePolicy
* the quote policy to use for output.
*
* @return A new CSVFormat that is equal to this but with the specified quote policy
*/
public CSVFormat withQuoteMode(final QuoteMode quoteModePolicy) {
return new CSVFormat(delimiter, quoteCharacter, quoteModePolicy, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the record separator of the format set to the specified character.
*
*
* Note: This setting is only used during printing and does not affect parsing. Parsing currently
* only works for inputs with '\n', '\r' and "\r\n"
*
*
* @param recordSeparator
* the record separator to use for output.
*
* @return A new CSVFormat that is equal to this but with the specified output record separator
*/
public CSVFormat withRecordSeparator(final char recordSeparator) {
return withRecordSeparator(String.valueOf(recordSeparator));
}
/**
* Returns a new {@code CSVFormat} with the record separator of the format set to the specified String.
*
*
* Note: This setting is only used during printing and does not affect parsing. Parsing currently
* only works for inputs with '\n', '\r' and "\r\n"
*
*
* @param recordSeparator
* the record separator to use for output.
*
* @return A new CSVFormat that is equal to this but with the specified output record separator
* @throws IllegalArgumentException
* if recordSeparator is none of CR, LF or CRLF
*/
public CSVFormat withRecordSeparator(final String recordSeparator) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with skipping the header record set to {@code true}.
*
* @return A new CSVFormat that is equal to this but with the specified skipHeaderRecord setting.
* @see #withSkipHeaderRecord(boolean)
* @see #withHeader(String...)
* @since 1.1
*/
public CSVFormat withSkipHeaderRecord() {
return this.withSkipHeaderRecord(true);
}
/**
* Returns a new {@code CSVFormat} with whether to skip the header record.
*
* @param skipHeaderRecord
* whether to skip the header record.
*
* @return A new CSVFormat that is equal to this but with the specified skipHeaderRecord setting.
* @see #withHeader(String...)
*/
public CSVFormat withSkipHeaderRecord(final boolean skipHeaderRecord) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} with the record separator of the format set to the operating system's line
* separator string, typically CR+LF on Windows and LF on Linux.
*
*
* Note: This setting is only used during printing and does not affect parsing. Parsing currently
* only works for inputs with '\n', '\r' and "\r\n"
*
*
* @return A new CSVFormat that is equal to this but with the operating system's line separator string.
* @since 1.6
*/
public CSVFormat withSystemRecordSeparator() {
return withRecordSeparator(System.getProperty("line.separator"));
}
/**
* Returns a new {@code CSVFormat} to add a trailing delimiter.
*
* @return A new CSVFormat that is equal to this but with the trailing delimiter setting.
* @since 1.3
*/
public CSVFormat withTrailingDelimiter() {
return withTrailingDelimiter(true);
}
/**
* Returns a new {@code CSVFormat} with whether to add a trailing delimiter.
*
* @param trailingDelimiter
* whether to add a trailing delimiter.
*
* @return A new CSVFormat that is equal to this but with the specified trailing delimiter setting.
* @since 1.3
*/
public CSVFormat withTrailingDelimiter(final boolean trailingDelimiter) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
/**
* Returns a new {@code CSVFormat} to trim leading and trailing blanks.
* See {@link #getTrim()} for details of where this is used.
*
* @return A new CSVFormat that is equal to this but with the trim setting on.
* @since 1.3
*/
public CSVFormat withTrim() {
return withTrim(true);
}
/**
* Returns a new {@code CSVFormat} with whether to trim leading and trailing blanks.
* See {@link #getTrim()} for details of where this is used.
*
* @param trim
* whether to trim leading and trailing blanks.
*
* @return A new CSVFormat that is equal to this but with the specified trim setting.
* @since 1.3
*/
public CSVFormat withTrim(final boolean trim) {
return new CSVFormat(delimiter, quoteCharacter, quoteMode, commentMarker, escapeCharacter,
ignoreSurroundingSpaces, ignoreEmptyLines, recordSeparator, nullString, headerComments, header,
skipHeaderRecord, allowMissingColumnNames, ignoreHeaderCase, trim, trailingDelimiter, autoFlush,
allowDuplicateHeaderNames);
}
}
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