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With inspiration from other libraries
/*
* [The "BSD license"]
* Copyright (c) 2011, abego Software GmbH, Germany (http://www.abego.org)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of the abego Software GmbH nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.abego.treelayout.internal.util.java.lang.string;
public class StringUtil {
/**
* Returns a quoted version of a given string, i.e. as a Java String
* Literal.
*
* @param s
* [nullable] the string to quote
* @param nullResult
* [default="null"] the String to be returned for null values.
* @return the nullResult when s is null, otherwise s as a quoted string
* (i.e. Java String Literal)
*
*/
public static String quote(String s, String nullResult) {
if (s == null) {
return nullResult;
}
StringBuffer result = new StringBuffer();
result.append('"');
int length = s.length();
for (int i = 0; i < length; i++) {
char c = s.charAt(i);
switch (c) {
case '\b': {
result.append("\\b");
break;
}
case '\f': {
result.append("\\f");
break;
}
case '\n': {
result.append("\\n");
break;
}
case '\r': {
result.append("\\r");
break;
}
case '\t': {
result.append("\\t");
break;
}
case '\\': {
result.append("\\\\");
break;
}
case '"': {
result.append("\\\"");
break;
}
default: {
if (c < ' ' || c >= '\u0080') {
String n = Integer.toHexString(c);
result.append("\\u");
result.append("0000".substring(n.length()));
result.append(n);
} else {
result.append(c);
}
}
}
}
result.append('"');
return result.toString();
}
/**
* see {@link #quote(String, String)}
*
* @param s the string to quote
* @return nullable
*/
public static String quote(String s) {
return quote(s, "null");
}
}