org.apache.solr.common.util.StrUtils Maven / Gradle / Ivy
/*
* 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.solr.common.util;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import org.apache.solr.common.SolrException;
/**
*
*/
public class StrUtils {
public static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
public static List splitSmart(String s, char separator) {
ArrayList lst = new ArrayList<>(4);
splitSmart(s, separator, lst);
return lst;
}
static final String DELIM_CHARS = "/:;.,%#";
public static List split(String s, char sep) {
if (DELIM_CHARS.indexOf(s.charAt(0)) > -1) {
sep = s.charAt(0);
}
return splitSmart(s, sep, true);
}
public static List splitSmart(String s, char separator, boolean trimEmpty) {
List l = splitSmart(s, separator);
if (trimEmpty) {
if (l.size() > 0 && l.get(0).isEmpty()) l.remove(0);
}
return l;
}
/**
* Split a string based on a separator, but don't split if it's inside
* a string. Assume '\' escapes the next char both inside and
* outside strings.
*/
public static void splitSmart(String s, char separator, List lst) {
int pos = 0, start = 0, end = s.length();
char inString = 0;
char ch = 0;
while (pos < end) {
char prevChar = ch;
ch = s.charAt(pos++);
if (ch == '\\') { // skip escaped chars
pos++;
} else if (inString != 0 && ch == inString) {
inString = 0;
} else if (ch == '\'' || ch == '"') {
// If char is directly preceeded by a number or letter
// then don't treat it as the start of a string.
// Examples: 50" TV, or can't
if (!Character.isLetterOrDigit(prevChar)) {
inString = ch;
}
} else if (ch == separator && inString == 0) {
lst.add(s.substring(start, pos - 1));
start = pos;
}
}
if (start < end) {
lst.add(s.substring(start, end));
}
/***
if (SolrCore.log.isLoggable(Level.FINEST)) {
SolrCore.log.trace("splitCommand={}", lst);
}
***/
}
/**
* Splits a backslash escaped string on the separator.
*
* Current backslash escaping supported:
*
\n \t \r \b \f are escaped the same as a Java String
*
Other characters following a backslash are produced verbatim (\c => c)
*
* @param s the string to split
* @param separator the separator to split on
* @param decode decode backslash escaping
* @return not null
*/
public static List splitSmart(String s, String separator, boolean decode) {
ArrayList lst = new ArrayList<>(2);
StringBuilder sb = new StringBuilder();
int pos = 0, end = s.length();
while (pos < end) {
if (s.startsWith(separator, pos)) {
if (sb.length() > 0) {
lst.add(sb.toString());
sb = new StringBuilder();
}
pos += separator.length();
continue;
}
char ch = s.charAt(pos++);
if (ch == '\\') {
if (!decode) sb.append(ch);
if (pos >= end) break; // ERROR, or let it go?
ch = s.charAt(pos++);
if (decode) {
switch (ch) {
case 'n':
ch = '\n';
break;
case 't':
ch = '\t';
break;
case 'r':
ch = '\r';
break;
case 'b':
ch = '\b';
break;
case 'f':
ch = '\f';
break;
}
}
}
sb.append(ch);
}
if (sb.length() > 0) {
lst.add(sb.toString());
}
return lst;
}
/**
* Splits file names separated by comma character.
* File names can contain comma characters escaped by backslash '\'
*
* @param fileNames the string containing file names
* @return a list of file names with the escaping backslashed removed
*/
public static List splitFileNames(String fileNames) {
if (fileNames == null)
return Collections.emptyList();
List result = new ArrayList<>();
for (String file : fileNames.split("(? items, char separator) {
if (items == null) return "";
StringBuilder sb = new StringBuilder(items.size() << 3);
boolean first = true;
for (Object o : items) {
String item = String.valueOf(o);
if (first) {
first = false;
} else {
sb.append(separator);
}
appendEscapedTextToBuilder(sb, item, separator);
}
return sb.toString();
}
public static List splitWS(String s, boolean decode) {
ArrayList lst = new ArrayList<>(2);
StringBuilder sb = new StringBuilder();
int pos = 0, end = s.length();
while (pos < end) {
char ch = s.charAt(pos++);
if (Character.isWhitespace(ch)) {
if (sb.length() > 0) {
lst.add(sb.toString());
sb = new StringBuilder();
}
continue;
}
if (ch == '\\') {
if (!decode) sb.append(ch);
if (pos >= end) break; // ERROR, or let it go?
ch = s.charAt(pos++);
if (decode) {
switch (ch) {
case 'n':
ch = '\n';
break;
case 't':
ch = '\t';
break;
case 'r':
ch = '\r';
break;
case 'b':
ch = '\b';
break;
case 'f':
ch = '\f';
break;
}
}
}
sb.append(ch);
}
if (sb.length() > 0) {
lst.add(sb.toString());
}
return lst;
}
public static List toLower(List strings) {
ArrayList ret = new ArrayList<>(strings.size());
for (String str : strings) {
ret.add(str.toLowerCase(Locale.ROOT));
}
return ret;
}
/**
* Return if a string starts with '1', 't', or 'T'
* and return false otherwise.
*/
public static boolean parseBoolean(String s) {
char ch = s.length() > 0 ? s.charAt(0) : 0;
return (ch == '1' || ch == 't' || ch == 'T');
}
/**
* how to transform a String into a boolean... more flexible than
* Boolean.parseBoolean() to enable easier integration with html forms.
*/
public static boolean parseBool(String s) {
if (s != null) {
if (s.startsWith("true") || s.startsWith("on") || s.startsWith("yes")) {
return true;
}
if (s.startsWith("false") || s.startsWith("off") || s.equals("no")) {
return false;
}
}
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "invalid boolean value: " + s);
}
/**
* {@link NullPointerException} and {@link SolrException} free version of {@link #parseBool(String)}
*
* @return parsed boolean value (or def, if s is null or invalid)
*/
public static boolean parseBool(String s, boolean def) {
if (s != null) {
if (s.startsWith("true") || s.startsWith("on") || s.startsWith("yes")) {
return true;
}
if (s.startsWith("false") || s.startsWith("off") || s.equals("no")) {
return false;
}
}
return def;
}
/**
* URLEncodes a value, replacing only enough chars so that
* the URL may be unambiguously pasted back into a browser.
*
* Characters with a numeric value less than 32 are encoded.
* &,=,%,+,space are encoded.
*/
public static void partialURLEncodeVal(Appendable dest, String val) throws IOException {
for (int i = 0; i < val.length(); i++) {
char ch = val.charAt(i);
if (ch < 32) {
dest.append('%');
if (ch < 0x10) dest.append('0');
dest.append(Integer.toHexString(ch));
} else {
switch (ch) {
case ' ':
dest.append('+');
break;
case '&':
dest.append("%26");
break;
case '%':
dest.append("%25");
break;
case '=':
dest.append("%3D");
break;
case '+':
dest.append("%2B");
break;
default:
dest.append(ch);
break;
}
}
}
}
/**
* Creates a new copy of the string with the separator backslash escaped.
*
* @see #join
*/
public static String escapeTextWithSeparator(String item, char separator) {
StringBuilder sb = new StringBuilder(item.length() * 2);
appendEscapedTextToBuilder(sb, item, separator);
return sb.toString();
}
/**
* writes chars from item to out, backslash escaping as needed based on separator --
* but does not append the separator itself
*/
public static void appendEscapedTextToBuilder(StringBuilder out,
String item,
char separator) {
for (int i = 0; i < item.length(); i++) {
char ch = item.charAt(i);
if (ch == '\\' || ch == separator) {
out.append('\\');
}
out.append(ch);
}
}
/**
* Format using {@link MessageFormat} but with the ROOT locale
*/
public static String formatString(String pattern, Object... args) {
return new MessageFormat(pattern, Locale.ROOT).format(args);
}
}