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The source code/* * Copyright (C) The Apache Software Foundation. All rights reserved. * * This software is published under the terms of the Apache Software * License version 1.1, a copy of which has been included with this * distribution in the LICENSE.txt file. */ package org.apache.log4j.helpers; import org.apache.log4j.spi.LoggingEvent; import org.apache.log4j.spi.LocationInfo; /** Utility class for transforming strings. @author Ceki Gülcü @author Michael A. McAngus */ public class Transform { private static final String CDATA_START = ""; private static final String CDATA_PSEUDO_END = "]]>"; private static final String CDATA_EMBEDED_END = CDATA_END + CDATA_PSEUDO_END + CDATA_START; private static final int CDATA_END_LEN = CDATA_END.length(); /** * This method takes a string which may contain HTML tags (ie, * <b>, <table>, etc) and replaces any '<' and '>' * characters with respective predefined entity references. * * @param input The text to be converted. * @return The input string with the characters '<' and '>' replaced with * < and > respectively. * */ static public String escapeTags(String input) { //Check if the string is null or zero length -- if so, return //what was sent in. if( input == null || input.length() == 0 ) { return input; } //Use a StringBuffer in lieu of String concatenation -- it is //much more efficient this way. StringBuffer buf = new StringBuffer(input.length() + 6); char ch = ' '; int len = input.length(); for(int i=0; i < len; i++) { ch = input.charAt(i); if(ch == '<') { buf.append("<"); } else if(ch == '>') { buf.append(">"); } else { buf.append(ch); } } return buf.toString(); } /** * Ensures that embeded CDEnd strings (]]>) are handled properly * within message, NDC and throwable tag text. * * @param buf StringBuffer holding the XML data to this point. The * initial CDStart () of the CDATA * section are the responsibility of the calling method. * @param str The String that is inserted into an existing CDATA Section within buf. * */ static public void appendEscapingCDATA(StringBuffer buf, String str) { if(str == null) { buf.append(""); return; } int end = str.indexOf(CDATA_END); if (end < 0) { buf.append(str); return; } int start = 0; while (end > -1) { buf.append(str.substring(start,end)); buf.append(CDATA_EMBEDED_END); start = end + CDATA_END_LEN; if (start < str.length()) { end = str.indexOf(CDATA_END, start); } else { return; } } buf.append(str.substring(start)); } } |
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