org.apache.pig.impl.util.StringUtils 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.pig.impl.util;
import java.util.AbstractCollection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class StringUtils {
public static String unescapeInputString(String input) {
if(input == null){
return "";
}
// Needed variables
// preset the size so our StringBuilders don't have to grow
int inputlength = input.length();
StringBuilder unicode = new StringBuilder(4);
StringBuilder output = new StringBuilder(inputlength) ;
boolean hadSlash = false;
boolean inUnicode = false;
// The main loop
for (int i = 0; i < inputlength; i++) {
char ch = input.charAt(i);
// currently doing unicode mode
if (inUnicode) {
unicode.append(ch);
if (unicode.length() == 4) {
// unicode now contains the four hex digits
try {
int value = Integer.parseInt(unicode.toString(), 0x10);
output.append((char) value) ;
// reuse the StringBuilder
unicode.setLength(0);
inUnicode = false;
hadSlash = false;
} catch (NumberFormatException nfe) {
throw new RuntimeException("Unable to parse unicode value: " + unicode, nfe);
}
}
continue;
}
if (hadSlash) {
// handle an escaped value
hadSlash = false;
switch (ch) {
case '\\':
output.append('\\');
break;
case '\'':
output.append('\'');
break;
case 'r':
output.append('\r');
break;
case 'f':
output.append('\f');
break;
case 't':
output.append('\t');
break;
case 'n':
output.append('\n');
break;
case 'b':
output.append('\b');
break;
case 'u':
{
// switch to unicode mode
inUnicode = true;
break;
}
default :
output.append(ch);
break;
}
continue;
} else if (ch == '\\') {
hadSlash = true;
continue;
}
output.append(ch);
}
return output.toString() ;
}
public static String join(AbstractCollection s, String delimiter) {
if (s.isEmpty()) return "";
Iterator iter = s.iterator();
StringBuffer buffer = new StringBuffer(iter.next());
while (iter.hasNext()) {
buffer.append(delimiter);
buffer.append(iter.next());
}
return buffer.toString();
}
public static String[] getPathStrings(String commaSeparatedPaths) {
int length = commaSeparatedPaths.length();
int curlyOpen = 0;
int pathStart = 0;
boolean globPattern = false;
List pathStrings = new ArrayList();
for (int i=0; i