Java String Unescape unescape(String str)

Description

Unescapes the given XML string.

License

Open Source License

Parameter

Parameter	Description
str	The source string.

Return

The escaped string.

Declaration

public static String unescape(String str) 

Method Source Code

//package com.java2s;
// are made available under the terms of the Eclipse Public License v1.0

public class Main {
    /**// w  ww .  j av a 2s  .c om
     * XML Escape characters.
     */
    public final static String XML_AMP = "&";
    public final static String XML_APOS = "'";
    public final static String XML_CR = "
";
    public final static String XML_GT = ">";
    public final static String XML_LT = "<";
    public final static String XML_LF = "
";
    public final static String XML_QUOT = """;

    /**
     * Unescapes the given XML string.
     * 
     * @param str
     *            The source string.
     * @return The escaped string.
     */
    public static String unescape(String str) {
        if (str == null || str.length() == 0)
            return ""; //$NON-NLS-1$
        StringBuffer sb = new StringBuffer();
        int len = str.length();
        for (int i = 0; i < len; i++) {
            char ch = str.charAt(i);
            switch (ch) {
            case '&':
                if (str.startsWith(XML_LT, i)) {
                    sb.append('<');
                    i += 3;
                } else if (str.startsWith(XML_GT, i)) {
                    sb.append('>');
                    i += 3;
                } else if (str.startsWith(XML_AMP, i)) {
                    sb.append('&');
                    i += 4;
                } else if (str.startsWith(XML_QUOT, i)) {
                    sb.append('"');
                    i += 5;
                } else if (str.startsWith(XML_APOS, i)) {
                    sb.append("\'"); //$NON-NLS-1$
                    i += 5;
                } else if (str.startsWith(XML_CR, i)) {
                    sb.append('\r');
                    i += 4;
                } else if (str.startsWith(XML_LF, i)) {
                    sb.append('\n');
                    i += 4;
                } else {
                    sb.append(ch);
                }
                break;
            default:
                sb.append(ch);
                break;
            }
        }
        return sb.toString();
    }
}

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