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/**
* *******************************************************************************
* Copyright (c) 2009 Mia-Software.
* 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:
*
* Fabien Giquel (Mia-Software) - initial API and implementation
* *******************************************************************************
*
*/
package org.eclipse.papyrus.views.properties.model.xwt.modisco;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Attribute;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.CDATA;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Comment;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.DocumentTypeDeclaration;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Element;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Namespace;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Node;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.ProcessingInstruction;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Root;
import org.eclipse.papyrus.views.properties.model.xwt.xwtxml.Text;
/**
*
* A XML writer dedicated to MoDisco Generic XML models.
*
*/
public class GenericXMLWriter extends PrintWriter {
protected static final String XML_VERSION = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"; //$NON-NLS-1$
private static final int STRING_BUFFER_OFFSET = 10;
/**
* The constructor wraps an outputStream.
*
* @param output
* @throws UnsupportedEncodingException
*/
public GenericXMLWriter(final OutputStream output) throws UnsupportedEncodingException {
super(new OutputStreamWriter(output, "UTF8")); //$NON-NLS-1$
println(GenericXMLWriter.XML_VERSION);
}
/**
* Serializes the element and its sub-elements.
*
* @param element
*/
public final void serialize(final Element element) {
startTag(element);
if (element.getChildren() != null) {
for (Node child : element.getChildren()) {
if (child instanceof Element) {
serialize((Element) child);
} else if (child instanceof CDATA) {
String text = ((CDATA) child).getName();
print("<![CDATA[" + text + "]]>"); //$NON-NLS-1$ //$NON-NLS-2$
} else if (child instanceof Text) {
String text = ((Text) child).getName();
print(GenericXMLWriter.getEscaped(text));
} else if (child instanceof Comment) {
String text = "<!--" + ((Comment) child).getName() + "-->"; //$NON-NLS-1$ //$NON-NLS-2$
print(text);
} else if (child instanceof ProcessingInstruction) {
printPI(((ProcessingInstruction) child));
}
}
}
endTag(element);
}
private void startTag(final Element element) {
if (element instanceof Root) {
Root root = (Root) element;
if (root.getDtd() != null) {
printDTD(root.getDtd());
}
if (root.getLeadingPIs() != null) {
for (ProcessingInstruction pi : root.getLeadingPIs()) {
printPI(pi);
println();
}
}
}
print("<"); //$NON-NLS-1$
print(element.getName());
if (element instanceof Root) {
Root root = (Root) element;
if (root.getNamespaces() != null) {
for (Namespace ns : root.getNamespaces()) {
if (ns.getName().length() > 0) {
printAttribute(GenericXMLHandler.XMLNS + ":" + ns.getName(), //$NON-NLS-1$
ns.getValue());
} else {
printAttribute(GenericXMLHandler.XMLNS, ns.getValue());
}
}
}
}
if (element.getChildren() != null) {
for (Node child : element.getChildren()) {
if (child instanceof Attribute) {
Attribute attr = (Attribute) child;
printAttribute(attr.getName(), attr.getValue());
}
}
}
print(">"); //$NON-NLS-1$
}
private void endTag(final Element element) {
print("</" + element.getName() + ">"); //$NON-NLS-1$ //$NON-NLS-2$
}
private void printAttribute(final String key, final String value) {
print(" "); //$NON-NLS-1$
print(key);
print("=\""); //$NON-NLS-1$
print(GenericXMLWriter.getEscaped(value));
print("\""); //$NON-NLS-1$
}
private void printDTD(final DocumentTypeDeclaration dtd) {
print("\n<!DOCTYPE "); //$NON-NLS-1$
print(dtd.getName());
print("\n\t\""); //$NON-NLS-1$
print(dtd.getPublicID());
print("\"\n\t\""); //$NON-NLS-1$
print(dtd.getSystemID());
print("\">"); //$NON-NLS-1$
}
private void printPI(final ProcessingInstruction pi) {
print("<?"); //$NON-NLS-1$
print(pi.getName());
print(" "); //$NON-NLS-1$
print(pi.getData());
print("?>"); //$NON-NLS-1$
}
private static void appendEscapedChar(final StringBuffer buffer, final char c) {
String replacement = GenericXMLWriter.getReplacement(c);
if (replacement != null) {
buffer.append('&');
buffer.append(replacement);
buffer.append(';');
} else {
buffer.append(c);
}
}
private static String getEscaped(final String s) {
StringBuffer result = new StringBuffer(s.length() + GenericXMLWriter.STRING_BUFFER_OFFSET);
for (int i = 0; i < s.length(); ++i) {
GenericXMLWriter.appendEscapedChar(result, s.charAt(i));
}
return result.toString();
}
private static String getReplacement(final char c) {
// Encode special XML characters into the equivalent character
// references.
// These five are defined by default for all XML documents.
switch (c) {
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"; //$NON-NLS-1$
default:
return null;
}
}
}
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