Mega Code Archive
DOM writer
<![CDATA[
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/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
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* 4. The names "Xerces" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
* A sample DOM writer. This sample program illustrates how to
* traverse a DOM tree in order to print a document that is parsed.
*
* @author Andy Clark, IBM
*
* @version $Id: DOMWriter.java,v 1.2 2007/07/19 04:35:46 ofung Exp $
*/
public class DOMWriter {
//
// Constants
//
// feature ids
/** Namespaces feature id (http://xml.org/sax/features/namespaces). */
protected static final String NAMESPACES_FEATURE_ID = "http://xml.org/sax/features/namespaces";
/** Validation feature id (http://xml.org/sax/features/validation). */
protected static final String VALIDATION_FEATURE_ID = "http://xml.org/sax/features/validation";
/** Schema validation feature id (http://apache.org/xml/features/validation/schema). */
protected static final String SCHEMA_VALIDATION_FEATURE_ID = "http://apache.org/xml/features/validation/schema";
/** Schema full checking feature id (http://apache.org/xml/features/validation/schema-full-checking). */
protected static final String SCHEMA_FULL_CHECKING_FEATURE_ID = "http://apache.org/xml/features/validation/schema-full-checking";
// property ids
/** Lexical handler property id (http://xml.org/sax/properties/lexical-handler). */
protected static final String LEXICAL_HANDLER_PROPERTY_ID = "http://xml.org/sax/properties/lexical-handler";
// default settings
/** Default parser name. */
protected static final String DEFAULT_PARSER_NAME = "dom.wrappers.Xerces";
/** Default namespaces support (true). */
protected static final boolean DEFAULT_NAMESPACES = true;
/** Default validation support (false). */
protected static final boolean DEFAULT_VALIDATION = false;
/** Default Schema validation support (false). */
protected static final boolean DEFAULT_SCHEMA_VALIDATION = false;
/** Default Schema full checking support (false). */
protected static final boolean DEFAULT_SCHEMA_FULL_CHECKING = false;
/** Default canonical output (false). */
protected static final boolean DEFAULT_CANONICAL = false;
//
// Data
//
/** Print writer. */
protected PrintWriter fOut;
/** Canonical output. */
protected boolean fCanonical;
/** Processing XML 1.1 document. */
protected boolean fXML11;
//
// Constructors
//
/** Default constructor. */
public DOMWriter() {
} // <init>()
public DOMWriter(boolean canonical) {
fCanonical = canonical;
} // <init>(boolean)
public DOMWriter( OutputStream out, String encoding ) throws UnsupportedEncodingException {
this();
setOutput(out,encoding);
}
//
// Public methods
//
/** Sets whether output is canonical. */
public void setCanonical(boolean canonical) {
fCanonical = canonical;
} // setCanonical(boolean)
/** Sets the output stream for printing. */
public void setOutput(OutputStream stream, String encoding)
throws UnsupportedEncodingException {
if (encoding == null) {
encoding = "UTF8";
}
java.io.Writer writer = new OutputStreamWriter(stream, encoding);
fOut = new PrintWriter(writer);
} // setOutput(OutputStream,String)
/** Sets the output writer. */
public void setOutput(java.io.Writer writer) {
fOut = writer instanceof PrintWriter
? (PrintWriter)writer : new PrintWriter(writer);
} // setOutput(java.io.Writer)
/** Writes the specified node, recursively. */
public void write(Node node) {
// is there anything to do?
if (node == null) {
return;
}
short type = node.getNodeType();
switch (type) {
case Node.DOCUMENT_NODE: {
Document document = (Document)node;
fXML11 = "1.1".equals(getVersion(document));
if (!fCanonical) {
if (fXML11) {
fOut.println("<?xml version=\"1.1\" encoding=\"UTF-8\"?>");
}
else {
fOut.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
}
fOut.flush();
write(document.getDoctype());
}
write(document.getDocumentElement());
break;
}
case Node.DOCUMENT_TYPE_NODE: {
DocumentType doctype = (DocumentType)node;
fOut.print("<!DOCTYPE ");
fOut.print(doctype.getName());
String publicId = doctype.getPublicId();
String systemId = doctype.getSystemId();
if (publicId != null) {
fOut.print(" PUBLIC '");
fOut.print(publicId);
fOut.print("' '");
fOut.print(systemId);
fOut.print('\'');
}
else if (systemId != null) {
fOut.print(" SYSTEM '");
fOut.print(systemId);
fOut.print('\'');
}
String internalSubset = doctype.getInternalSubset();
if (internalSubset != null) {
fOut.println(" [");
fOut.print(internalSubset);
fOut.print(']');
}
fOut.println('>');
break;
}
case Node.ELEMENT_NODE: {
fOut.print('<');
fOut.print(node.getNodeName());
Attr attrs[] = sortAttributes(node.getAttributes());
for (int i = 0; i < attrs.length; i++) {
Attr attr = attrs[i];
fOut.print(' ');
fOut.print(attr.getNodeName());
fOut.print("=\"");
normalizeAndPrint(attr.getNodeValue(), true);
fOut.print('"');
}
fOut.print('>');
fOut.flush();
Node child = node.getFirstChild();
while (child != null) {
write(child);
child = child.getNextSibling();
}
break;
}
case Node.ENTITY_REFERENCE_NODE: {
if (fCanonical) {
Node child = node.getFirstChild();
while (child != null) {
write(child);
child = child.getNextSibling();
}
}
else {
fOut.print('&');
fOut.print(node.getNodeName());
fOut.print(';');
fOut.flush();
}
break;
}
case Node.CDATA_SECTION_NODE: {
if (fCanonical) {
normalizeAndPrint(node.getNodeValue(), false);
}
else {
fOut.print("<![CDATA[");
fOut.print(node.getNodeValue());
fOut.print("]]>");
}
fOut.flush();
break;
}
case Node.TEXT_NODE: {
normalizeAndPrint(node.getNodeValue(), false);
fOut.flush();
break;
}
case Node.PROCESSING_INSTRUCTION_NODE: {
fOut.print("<?");
fOut.print(node.getNodeName());
String data = node.getNodeValue();
if (data != null && data.length() > 0) {
fOut.print(' ');
fOut.print(data);
}
fOut.print("?>");
fOut.flush();
break;
}
case Node.COMMENT_NODE: {
if (!fCanonical) {
fOut.print("<!--");
String comment = node.getNodeValue();
if (comment != null && comment.length() > 0) {
fOut.print(comment);
}
fOut.print("-->");
fOut.flush();
}
}
}
if (type == Node.ELEMENT_NODE) {
fOut.print("</");
fOut.print(node.getNodeName());
fOut.print('>');
fOut.flush();
}
} // write(Node)
/** Returns a sorted list of attributes. */
protected Attr[] sortAttributes(NamedNodeMap attrs) {
int len = (attrs != null) ? attrs.getLength() : 0;
Attr array[] = new Attr[len];
for (int i = 0; i < len; i++) {
array[i] = (Attr)attrs.item(i);
}
for (int i = 0; i < len - 1; i++) {
String name = array[i].getNodeName();
int index = i;
for (int j = i + 1; j < len; j++) {
String curName = array[j].getNodeName();
if (curName.compareTo(name) < 0) {
name = curName;
index = j;
}
}
if (index != i) {
Attr temp = array[i];
array[i] = array[index];
array[index] = temp;
}
}
return array;
} // sortAttributes(NamedNodeMap):Attr[]
//
// Protected methods
//
/** Normalizes and prints the given string. */
protected void normalizeAndPrint(String s, boolean isAttValue) {
int len = (s != null) ? s.length() : 0;
for (int i = 0; i < len; i++) {
char c = s.charAt(i);
normalizeAndPrint(c, isAttValue);
}
} // normalizeAndPrint(String,boolean)
/** Normalizes and print the given character. */
protected void normalizeAndPrint(char c, boolean isAttValue) {
switch (c) {
case '<': {
fOut.print("<");
break;
}
case '>': {
fOut.print(">");
break;
}
case '&': {
fOut.print("&");
break;
}
case '"': {
// A '"' that appears in character data
// does not need to be escaped.
if (isAttValue) {
fOut.print(""");
}
else {
fOut.print("\"");
}
break;
}
case '\r': {
// If CR is part of the document's content, it
// must not be printed as a literal otherwise
// it would be normalized to LF when the document
// is reparsed.
fOut.print("
");
break;
}
case '\n': {
if (fCanonical) {
fOut.print("
");
break;
}
// else, default print char
}
default: {
// In XML 1.1, control chars in the ranges [#x1-#x1F, #x7F-#x9F] must be escaped.
//
// Escape space characters that would be normalized to #x20 in attribute values
// when the document is reparsed.
//
// Escape NEL (0x85) and LSEP (0x2028) that appear in content
// if the document is XML 1.1, since they would be normalized to LF
// when the document is reparsed.
if (fXML11 && ((c >= 0x01 && c <= 0x1F && c != 0x09 && c != 0x0A)
|| (c >= 0x7F && c <= 0x9F) || c == 0x2028)
|| isAttValue && (c == 0x09 || c == 0x0A)) {
fOut.print("&#x");
fOut.print(Integer.toHexString(c).toUpperCase());
fOut.print(";");
}
else {
fOut.print(c);
}
}
}
} // normalizeAndPrint(char,boolean)
/** Extracts the XML version from the Document. */
protected String getVersion(Document document) {
if (document == null) {
return null;
}
String version = null;
Method getXMLVersion = null;
try {
getXMLVersion = document.getClass().getMethod("getXmlVersion", new Class[]{});
// If Document class implements DOM L3, this method will exist.
if (getXMLVersion != null) {
version = (String) getXMLVersion.invoke(document, null);
}
}
catch (Exception e) {
// Either this locator object doesn't have
// this method, or we're on an old JDK.
}
return version;
} // getVersion(Document)
//
// Private static methods
//
/** Prints the usage. */
private static void printUsage() {
System.err.println("usage: java dom.Writer (options) uri ...");
System.err.println();
System.err.println("options:");
System.err.println(" -p name Select parser by name.");
System.err.println(" -n | -N Turn on/off namespace processing.");
System.err.println(" -v | -V Turn on/off validation.");
System.err.println(" -s | -S Turn on/off Schema validation support.");
System.err.println(" NOTE: Not supported by all parsers.");
System.err.println(" -f | -F Turn on/off Schema full checking.");
System.err.println(" NOTE: Requires use of -s and not supported by all parsers.");
System.err.println(" -c | -C Turn on/off Canonical XML output.");
System.err.println(" NOTE: This is not W3C canonical output.");
System.err.println(" -h This help screen.");
System.err.println();
System.err.println("defaults:");
System.err.println(" Parser: "+DEFAULT_PARSER_NAME);
System.err.print(" Namespaces: ");
System.err.println(DEFAULT_NAMESPACES ? "on" : "off");
System.err.print(" Validation: ");
System.err.println(DEFAULT_VALIDATION ? "on" : "off");
System.err.print(" Schema: ");
System.err.println(DEFAULT_SCHEMA_VALIDATION ? "on" : "off");
System.err.print(" Schema full checking: ");
System.err.println(DEFAULT_SCHEMA_FULL_CHECKING ? "on" : "off");
System.err.print(" Canonical: ");
System.err.println(DEFAULT_CANONICAL ? "on" : "off");
} // printUsage()
} // class Writer
]]>