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/*******************************************************************************
* Copyright 2016 uniVocity Software Pty Ltd
*
* Licensed 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 com.univocity.parsers.fixed;
import com.univocity.parsers.annotations.*;
import com.univocity.parsers.annotations.helpers.*;
import com.univocity.parsers.common.*;
import java.lang.reflect.*;
import java.util.*;
import java.util.Map.*;
/**
* This class provides the name, length, alignment and padding of each field in a fixed-width record.
*
* @author uniVocity Software Pty Ltd - [email protected]
*/
public class FixedWidthFields implements Cloneable {
private List fieldLengths = new ArrayList();
private List fieldNames = new ArrayList();
private List fieldAlignment = new ArrayList();
private List fieldPadding = new ArrayList();
private boolean noNames = true;
/**
* Defines a sequence of field names used to refer to columns in the input/output text of an entity, along with their lengths.
* The field names defined will be used as headers, having the same effect of a call to {@link FixedWidthParserSettings#setHeaders(String...)}.
*
* @param fields a {@link LinkedHashMap} containing the sequence of fields to be associated with each column in the input/output, with their respective length.
*/
public FixedWidthFields(LinkedHashMap fields) {
if (fields == null || fields.isEmpty()) {
throw new IllegalArgumentException("Map of fields and their lengths cannot be null/empty");
}
for (Entry entry : fields.entrySet()) {
String fieldName = entry.getKey();
Integer fieldLength = entry.getValue();
addField(fieldName, fieldLength);
}
}
/**
* Defines a sequence of field names used to refer to columns in the input/output text of an entity, along with their lengths.
* The field names defined will be used as headers, having the same effect of a call to {@link FixedWidthParserSettings#setHeaders(String...)}.
*
* @param headers the sequence of fields to be associated with each column in the input/output
* @param lengths the sequence of lengths to be associated with each given header. The size of this array must match the number of given headers.
*/
public FixedWidthFields(String[] headers, int[] lengths) {
if (headers == null || headers.length == 0) {
throw new IllegalArgumentException("Headers cannot be null/empty");
}
if (lengths == null || lengths.length == 0) {
throw new IllegalArgumentException("Field lengths cannot be null/empty");
}
if (headers.length != lengths.length) {
throw new IllegalArgumentException("Sequence of headers and their respective lengths must match. Got " + headers.length + " headers but " + lengths.length + " lengths");
}
for (int i = 0; i < headers.length; i++) {
addField(headers[i], lengths[i]);
}
}
/**
* Creates a new instance initialized with the lengths of all fields in a fixed-width record.
*
* @param fieldLengths The number lengths of all fields in a fixed-width record. All lengths must be greater than 0.
*/
public FixedWidthFields(int... fieldLengths) {
for (int i = 0; i < fieldLengths.length; i++) {
addField(fieldLengths[i]);
}
}
/**
* Creates a new instance initialized from {@link FixedWidth} annotations in the fields of a given class. Note that
* all fields should additionally have the {@link Parsed} annotation to configure header names and/or their positions.
*
* @param beanClass the class whose {@link FixedWidth} annotations will be processed to configure this field list.
*/
public FixedWidthFields(Class beanClass) {
if (beanClass == null) {
throw new IllegalArgumentException("Class must not be null.");
}
List fieldSequence = AnnotationHelper.getFieldSequence(beanClass, true);
if (fieldSequence.isEmpty()) {
throw new IllegalArgumentException("Can't derive fixed-width fields from class '" + beanClass.getName() + "'. No @Parsed annotations found.");
}
Set fieldNamesWithoutConfig = new LinkedHashSet();
for (Field field : fieldSequence) {
if (field == null) {
continue;
}
String fieldName = AnnotationHelper.getHeaderName(field);
FixedWidth fw = AnnotationHelper.findAnnotation(field, FixedWidth.class);
if (fw == null) {
fieldNamesWithoutConfig.add(field.getName());
continue;
}
if (fieldName == null) {
addField(fw.value(), fw.alignment(), fw.padding());
} else {
addField(fieldName, fw.value(), fw.alignment(), fw.padding());
}
}
if (fieldNamesWithoutConfig.size() > 0) {
throw new IllegalArgumentException("Can't derive fixed-width fields from class '" + beanClass.getName() + "'. " +
"The following fields don't have a @FixedWidth annotation: " + fieldNamesWithoutConfig);
}
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField(5).addField(6)...
*
* @param length the length of the next field. It must be greater than 0.
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(int length) {
return addField(null, length, FieldAlignment.LEFT, '\0');
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField(5).addField(6)...
*
* @param length the length of the next field. It must be greater than 0.
* @param alignment the alignment of the field
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(int length, FieldAlignment alignment) {
return addField(null, length, alignment, '\0');
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField("field_1", 5).addField("field_2", 6)...
*
* @param name the name of the next field. It is not validated.
* @param length the length of the next field. It must be greater than 0.
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(String name, int length) {
return addField(name, length, FieldAlignment.LEFT, '\0');
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField("field_1", 5).addField("field_2", 6)...
*
* @param name the name of the next field. It is not validated.
* @param length the length of the next field. It must be greater than 0.
* @param alignment the alignment of the field
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(String name, int length, FieldAlignment alignment) {
return addField(name, length, alignment, '\0');
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField(5).addField(6)...
*
* @param length the length of the next field. It must be greater than 0.
* @param padding the representation of unused space in this field
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(int length, char padding) {
return addField(null, length, FieldAlignment.LEFT, padding);
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField(5).addField(6)...
*
* @param length the length of the next field. It must be greater than 0.
* @param alignment the alignment of the field
* @param padding the representation of unused space in this field
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(int length, FieldAlignment alignment, char padding) {
return addField(null, length, alignment, padding);
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField("field_1", 5).addField("field_2", 6)...
*
* @param name the name of the next field. It is not validated.
* @param length the length of the next field. It must be greater than 0.
* @param padding the representation of unused space in this field
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(String name, int length, char padding) {
return addField(name, length, FieldAlignment.LEFT, padding);
}
/**
* Adds the length of the next field in a fixed-width record. This method can be chained like this: addField("field_1", 5).addField("field_2", 6)...
*
* @param name the name of the next field. It is not validated.
* @param length the length of the next field. It must be greater than 0.
* @param alignment the alignment of the field
* @param padding the representation of unused space in this field
*
* @return the FixedWidthFields instance itself for chaining.
*/
public FixedWidthFields addField(String name, int length, FieldAlignment alignment, char padding) {
validateLength(name, length);
fieldLengths.add(length);
fieldNames.add(name);
fieldPadding.add(padding);
if (name != null) {
noNames = false;
}
fieldAlignment.add(alignment);
return this;
}
private void validateLength(String name, int length) {
if (length < 1) {
if (name == null) {
throw new IllegalArgumentException("Invalid field length: " + length + " for field at index " + fieldLengths.size());
} else {
throw new IllegalArgumentException("Invalid field length: " + length + " for field " + name);
}
}
}
/**
* Returns the number of fields in a fixed-width record
*
* @return the number of fields in a fixed-width record
*/
public int getFieldsPerRecord() {
return fieldLengths.size();
}
/**
* Returns the name of each field in a fixed-width record, if any
*
* @return the name of each field in a fixed-width record, or null if no name has been defined.
*/
public String[] getFieldNames() {
if (noNames) {
return null;
}
return fieldNames.toArray(new String[fieldNames.size()]);
}
/**
* Returns a copy of the sequence of field lengths of a fixed-width record
*
* @return a copy of the sequence of field lengths of a fixed-width record
*/
public int[] getFieldLengths() {
return ArgumentUtils.toIntArray(fieldLengths);
}
/**
* Modifies the length of a given field
*
* @param name the name of the field whose length must be altered
* @param newLength the new length of the given field
*/
public void setFieldLength(String name, int newLength) {
if (name == null) {
throw new IllegalArgumentException("Field name cannot be null");
}
int index = fieldNames.indexOf(name);
if (index == -1) {
throw new IllegalArgumentException("Cannot find field with name '" + name + '\'');
}
validateLength(name, newLength);
fieldLengths.set(index, newLength);
}
/**
* Modifies the length of a given field
*
* @param position the position of the field whose length must be altered
* @param newLength the new length of the given field
*/
public void setFieldLength(int position, int newLength) {
validateIndex(position);
validateLength("at index " + position, newLength);
fieldLengths.set(position, newLength);
}
/**
* Applies alignment to a given list of fields
*
* @param alignment the alignment to apply
* @param positions the positions of the fields that should be aligned
*/
public void setAlignment(FieldAlignment alignment, int... positions) {
for (int position : positions) {
setAlignment(position, alignment);
}
}
/**
* Applies alignment to a given list of fields
*
* @param alignment the alignment to apply
* @param names the names of the fields that should be aligned
*/
public void setAlignment(FieldAlignment alignment, String... names) {
for (String name : names) {
int position = indexOf(name);
setAlignment(position, alignment);
}
}
private void validateIndex(int position) {
if (position < 0 && position >= fieldLengths.size()) {
throw new IllegalArgumentException("No field defined at index " + position);
}
}
/**
* Returns the index of a field name. An {@code IllegalArgumentException} will be thrown if no names have been defined.
*
* @param fieldName the name of the field to be searched
*
* @return the index of the field, or -1 if it does not exist.
*/
public int indexOf(String fieldName) {
if (noNames) {
throw new IllegalArgumentException("No field names defined");
}
if (fieldName == null || fieldName.trim().isEmpty()) {
throw new IllegalArgumentException("Field name cannot be null/empty");
}
fieldName = ArgumentUtils.normalize(fieldName);
int i = 0;
for (String name : this.fieldNames) {
name = ArgumentUtils.normalize(name);
if (name.equals(fieldName)) {
return i;
}
i++;
}
return -1;
}
private void setAlignment(int position, FieldAlignment alignment) {
if (alignment == null) {
throw new IllegalArgumentException("Alignment cannot be null");
}
validateIndex(position);
this.fieldAlignment.set(position, alignment);
}
/**
* Returns the alignment of a given field.
*
* @param position the index of the field whose alignment will be returned
*
* @return the alignment of the field
*/
public FieldAlignment getAlignment(int position) {
validateIndex(position);
return fieldAlignment.get(position);
}
/**
* Returns the alignment of a given field. An {@code IllegalArgumentException} will be thrown if no names have been defined.
*
* @param fieldName the name of the field whose alignment will be returned
*
* @return the alignment of the given field
*/
public FieldAlignment getAlignment(String fieldName) {
int index = indexOf(fieldName);
if (index == -1) {
throw new IllegalArgumentException("Field '" + fieldName + "' does not exist. Available field names are: " + this.fieldNames);
}
return getAlignment(index);
}
/**
* Returns a copy of the sequence of alignment settings to apply over each field in the fixed-width record.
*
* @return the sequence of alignment settings to apply over each field in the fixed-width record.
*/
public FieldAlignment[] getFieldAlignments() {
return fieldAlignment.toArray(new FieldAlignment[fieldAlignment.size()]);
}
/**
* Returns a copy of the sequence of padding characters to apply over each field in the fixed-width record.
*
* The null character ({@code '\0'}) is used to inform no padding has been explicitly set for a field, and that the
* default padding character defined in {@link FixedWidthFormat#getPadding()} should be used.
*
* @return the sequence of padding characters to apply over each field in the fixed-width record.
*/
public char[] getFieldPaddings() {
return ArgumentUtils.toCharArray(fieldPadding);
}
char[] getFieldPaddings(FixedWidthFormat format) {
char[] out = getFieldPaddings();
for (int i = 0; i < out.length; i++) {
if (out[i] == '\0') {
out[i] = format.getPadding();
}
}
return out;
}
/**
* Applies a custom padding character to a given list of fields
*
* @param padding the padding to apply
* @param positions the positions of the fields that should use the given padding character
*/
public void setPadding(char padding, int... positions) {
for (int position : positions) {
setPadding(position, padding);
}
}
/**
* Applies a custom padding character to a given list of fields
*
* @param padding the padding to apply
* @param names the names of the fields that should use the given padding character
*/
public void setPadding(char padding, String... names) {
for (String name : names) {
int position = indexOf(name);
setPadding(position, padding);
}
}
private void setPadding(int position, char padding) {
if (padding == '\0') {
throw new IllegalArgumentException("Cannot use the null character as padding");
}
validateIndex(position);
fieldPadding.set(position, padding);
}
@Override
public String toString() {
StringBuilder out = new StringBuilder();
int i = 0;
for (Integer length : fieldLengths) {
out.append("\n\t\t").append(i + 1).append('\t');
if (i < fieldNames.size()) {
out.append(fieldNames.get(i));
}
out.append("length: ").append(length);
out.append(", align: ").append(fieldAlignment.get(i));
out.append(", padding: ").append(fieldPadding.get(i));
i++;
}
return out.toString();
}
static void setHeadersIfPossible(FixedWidthFields fieldLengths, CommonSettings settings) {
if (fieldLengths != null && settings.getHeaders() == null) {
String[] headers = fieldLengths.getFieldNames();
if (headers != null) {
int[] lengths = fieldLengths.getFieldLengths();
if (lengths.length == headers.length) {
settings.setHeaders(headers);
}
}
}
}
@Override
protected FixedWidthFields clone() {
try {
FixedWidthFields out = (FixedWidthFields) super.clone();
out.fieldLengths = new ArrayList(fieldLengths);
out.fieldNames = new ArrayList(fieldNames);
out.fieldAlignment = new ArrayList(fieldAlignment);
out.fieldPadding = new ArrayList(fieldPadding);
return out;
} catch (CloneNotSupportedException e) {
throw new IllegalStateException(e);
}
}
}
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