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Java API for handling configuration files in Windows .ini format. The library includes its own Map based API, Java Preferences API and Java Beans API for handling .ini files. Additionally, the library includes a feature rich (variable/macro substitution, multiply property values, etc) java.util.Properties replacement.

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/**
 * Copyright 2005,2009 Ivan SZKIBA
 * 
 * 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 org.ini4j;

public class EscapeTool
{
    private static final char[] HEX = "0123456789abcdef".toCharArray();
    private static final EscapeTool _instance = ServiceFinder.findService(EscapeTool.class);

    public static EscapeTool getInstance()
    {
        return _instance;
    }

    public String escape(String line)
    {
        int len = line.length();
        StringBuilder buffer = new StringBuilder(len * 2);

        for (int i = 0; i < len; i++)
        {
            char c = line.charAt(i);
            int idx = "\\\t\n\f".indexOf(c);

            if (idx >= 0)
            {
                buffer.append('\\');
                buffer.append("\\tnf".charAt(idx));
            }
            else
            {
                if ((c < 0x0020) || (c > 0x007e))
                {
                    buffer.append("\\u");
                    buffer.append(HEX[(c >>> 12) & 0x0f]);
                    buffer.append(HEX[(c >>> 8) & 0x0f]);
                    buffer.append(HEX[(c >>> 4) & 0x0f]);
                    buffer.append(HEX[c & 0x0f]);
                }
                else
                {
                    buffer.append(c);
                }
            }
        }

        return buffer.toString();
    }

    public String unescape(String line)
    {
        int n = line.length();
        StringBuilder buffer = new StringBuilder(n);

        for (int i = 0; i < n;)
        {
            char c = line.charAt(i++);

            if (c == '\\')
            {
                c = line.charAt(i++);
                if (c == 'u')
                {
                    try
                    {
                        c = (char) Integer.parseInt(line.substring(i, i += 4), 16);
                    }
                    catch (RuntimeException x)
                    {
                        throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
                    }
                }
                else
                {
                    int idx = "\\tnf".indexOf(c);

                    if (idx >= 0)
                    {
                        c = "\\\t\n\f".charAt(idx);
                    }
                }
            }

            buffer.append(c);
        }

        return buffer.toString();
    }
}