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/*******************************************************************************
* Copyright (c) 2003, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
/*
* Created on May 20, 2004
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Generation - Code and Comments
*/
package org.eclipse.wst.common.internal.emf.resource;
/**
* @author mdelder
*
*/
public class XMLEncoderDecoder {
/**
*
*/
public XMLEncoderDecoder() {
super();
}
/**
* Identifies the last printable character in the Unicode range that is supported by the
* encoding used with this serializer. For 8-bit encodings this will be either 0x7E or 0xFF. For
* 16-bit encodings this will be 0xFFFF. Characters that are not printable will be escaped using
* character references.
*/
private int _lastPrintable = 0x7E;
protected static XMLEncoderDecoder _singleton;
/**
* Returns a decoded version of the value.
*/
public String decode(String value) {
// NOT_IMPLEMENTED
return value;
}
/**
* Escapes a string so it may be printed as text content or attribute value. Non printable
* characters are escaped using character references. Where the format specifies a deault entity
* reference, that reference is used (e.g. <tt>&lt;</tt>).
*
* @param source
* The string to escape
*/
public char[] encode(char[] value) {
boolean unmodified = true;
StringBuffer sbuf = new StringBuffer(value.length);
String charRef = null;
char ch;
for (int i = 0; i < value.length; ++i) {
ch = value[i];
// If there is a suitable entity reference for this
// character, print it. The list of available entity
// references is almost but not identical between
// XML and HTML.
charRef = getEntityRef(ch);
if (charRef != null) {
sbuf.append('&');
sbuf.append(charRef);
sbuf.append(';');
unmodified = false;
} else if ((ch >= ' ' && ch <= _lastPrintable && ch != 0xF7) || ch == '\n' || ch == '\r' || ch == '\t') {
// If the character is not printable, print as character
// reference.
// Non printables are below ASCII space but not tab or line
// terminator, ASCII delete, or above a certain Unicode
// threshold.
sbuf.append(ch);
} else {
sbuf.append("&#");//$NON-NLS-1$
sbuf.append(Integer.toString(ch));
sbuf.append(';');
unmodified = false;
}
}
if (unmodified)
return value;
char[] result = new char[sbuf.length()];
sbuf.getChars(0, sbuf.length(), result, 0);
return result;
}
/**
* Escapes a string so it may be printed as text content or attribute value. Non printable
* characters are escaped using character references. Where the format specifies a deault entity
* reference, that reference is used (e.g. <tt>&lt;</tt>).
*
* @param source
* The string to escape
*/
public String encode(String value) {
StringBuffer sbuf = new StringBuffer(value.length());
String charRef = null;
char ch;
for (int i = 0; i < value.length(); ++i) {
ch = value.charAt(i);
// If there is a suitable entity reference for this
// character, print it. The list of available entity
// references is almost but not identical between
// XML and HTML.
charRef = getEntityRef(ch);
if (charRef != null) {
sbuf.append('&');
sbuf.append(charRef);
sbuf.append(';');
} else if ((ch >= ' ' && ch <= _lastPrintable && ch != 0xF7) || ch == '\n' || ch == '\r' || ch == '\t') {
// If the character is not printable, print as character
// reference.
// Non printables are below ASCII space but not tab or line
// terminator, ASCII delete, or above a certain Unicode
// threshold.
sbuf.append(ch);
} else {
sbuf.append("&#");//$NON-NLS-1$
sbuf.append(Integer.toString(ch));
sbuf.append(';');
}
}
return sbuf.toString();
}
public static String escape(String value) {
if (_singleton == null) {
_singleton = new XMLEncoderDecoder();
}
return _singleton.encode(value);
}
/**
* Returns the suitable entity reference for this character value, or null if no such entity
* exists. Calling this method with <tt>'&'</tt> will return <tt>"&amp;"</tt>.
*
* @param ch
* Character value
* @return Character entity name, or null
*/
protected String getEntityRef(char ch) {
// Encode special XML characters into the equivalent character
// references.
// These five are defined by default for all XML documents.
switch (ch) {
case '<' :
return "lt";//$NON-NLS-1$
case '>' :
return "gt";//$NON-NLS-1$
case '"' :
return "quot";//$NON-NLS-1$
case '\'' :
return "apos";//$NON-NLS-1$
case '&' :
return "amp";//$NON-NLS-1$
}
return null;
}
}
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