/*
* 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.
*
* 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",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* 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/>.
*/
package org.apache.xerces.dom;
import org.apache.xerces.impl.RevalidationHandler;
import org.apache.xerces.parsers.DOMParserImpl;
import org.apache.xerces.util.ObjectFactory;
import org.apache.xerces.util.XMLChar;
import org.apache.xml.serialize.DOMSerializerImpl;
import org.w3c.dom.DOMException;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.ls.LSParser;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;
/**
* The DOMImplementation class is description of a particular
* implementation of the Document Object Model. As such its data is
* static, shared by all instances of this implementation.
* <P>
* The DOM API requires that it be a real object rather than static
* methods. However, there's nothing that says it can't be a singleton,
* so that's how I've implemented it.
* <P>
* This particular class, along with CoreDocumentImpl, supports the DOM
* Core and Load/Save (Experimental). Optional modules are supported by
* the more complete DOMImplementation class along with DocumentImpl.
* @version $Id: CoreDOMImplementationImpl.java,v 1.28 2003/11/17 13:48:40 venu Exp $
* @since PR-DOM-Level-1-19980818.
*/
public class CoreDOMImplementationImpl
implements DOMImplementation, DOMImplementationLS {
//
// Data
//
// validators pool
private static final int SIZE = 2;
private RevalidationHandler validators[] = new RevalidationHandler[SIZE];
private int freeValidatorIndex = -1;
private int currentSize = SIZE;
// Document and doctype counter. Used to assign order to documents and
// doctypes without owners, on an demand basis. Used for
// compareDocumentPosition
private int docAndDoctypeCounter = 0;
// static
/** Dom implementation singleton. */
static CoreDOMImplementationImpl singleton =
new CoreDOMImplementationImpl();
//
// Public methods
//
/** NON-DOM: Obtain and return the single shared object */
public static DOMImplementation getDOMImplementation() {
return singleton;
}
//
// DOMImplementation methods
//
/**
* Test if the DOM implementation supports a specific "feature" --
* currently meaning language and level thereof.
*
* @param feature The package name of the feature to test.
* In Level 1, supported values are "HTML" and "XML" (case-insensitive).
* At this writing, org.apache.xerces.dom supports only XML.
*
* @param version The version number of the feature being tested.
* This is interpreted as "Version of the DOM API supported for the
* specified Feature", and in Level 1 should be "1.0"
*
* @return true iff this implementation is compatable with the specified
* feature and version.
*/
public boolean hasFeature(String feature, String version) {
// Currently, we support only XML Level 1 version 1.0
boolean anyVersion = version == null || version.length() == 0;
// check if Xalan implementation is around and if yes report true for supporting
// XPath API
if ((feature.equalsIgnoreCase("XPath") || feature.equalsIgnoreCase("+XPath"))&& version.equals("3.0")){
try{
Class xpathClass = ObjectFactory.findProviderClass(
"org.apache.xpath.domapi.XPathEvaluatorImpl",
ObjectFactory.findClassLoader(), true);
}
catch (Exception e){
return false;
}
return true;
}
return (
feature.equalsIgnoreCase("Core")
&& (anyVersion || version.equals("1.0") || version.equals("2.0")))
|| (feature.equalsIgnoreCase("XML")
&& (anyVersion || version.equals("1.0") || version.equals("2.0")))
|| (feature.equalsIgnoreCase("LS")
&& (anyVersion || version.equals("3.0")));
} // hasFeature(String,String):boolean
/**
* Introduced in DOM Level 2. <p>
*
* Creates an empty DocumentType node.
*
* @param qualifiedName The qualified name of the document type to be created.
* @param publicID The document type public identifier.
* @param systemID The document type system identifier.
* @since WD-DOM-Level-2-19990923
*/
public DocumentType createDocumentType( String qualifiedName,
String publicID, String systemID) {
// REVISIT: this might allow creation of invalid name for DOCTYPE
// xmlns prefix.
// also there is no way for a user to turn off error checking.
checkQName(qualifiedName);
return new DocumentTypeImpl(null, qualifiedName, publicID, systemID);
}
final void checkQName(String qname){
int index = qname.indexOf(':');
int lastIndex = qname.lastIndexOf(':');
int length = qname.length();
// it is an error for NCName to have more than one ':'
// check if it is valid QName [Namespace in XML production 6]
if (index == 0 || index == length - 1 || lastIndex != index) {
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"NAMESPACE_ERR",
null);
throw new DOMException(DOMException.NAMESPACE_ERR, msg);
}
int start = 0;
// Namespace in XML production [6]
if (index > 0) {
// check that prefix is NCName
if (!XMLChar.isNCNameStart(qname.charAt(start))) {
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"INVALID_CHARACTER_ERR",
null);
throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
}
for (int i = 1; i < index; i++) {
if (!XMLChar.isNCName(qname.charAt(i))) {
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"INVALID_CHARACTER_ERR",
null);
throw new DOMException(
DOMException.INVALID_CHARACTER_ERR,
msg);
}
}
start = index + 1;
}
// check local part
if (!XMLChar.isNCNameStart(qname.charAt(start))) {
// REVISIT: add qname parameter to the message
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"INVALID_CHARACTER_ERR",
null);
throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
}
for (int i = start + 1; i < length; i++) {
if (!XMLChar.isNCName(qname.charAt(i))) {
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"INVALID_CHARACTER_ERR",
null);
throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
}
}
}
/**
* Introduced in DOM Level 2. <p>
*
* Creates an XML Document object of the specified type with its document
* element.
*
* @param namespaceURI The namespace URI of the document
* element to create, or null.
* @param qualifiedName The qualified name of the document
* element to create.
* @param doctype The type of document to be created or null.<p>
*
* When doctype is not null, its
* Node.ownerDocument attribute is set to
* the document being created.
* @return Document A new Document object.
* @throws DOMException WRONG_DOCUMENT_ERR: Raised if doctype has
* already been used with a different document.
* @since WD-DOM-Level-2-19990923
*/
public Document createDocument(
String namespaceURI,
String qualifiedName,
DocumentType doctype)
throws DOMException {
if (doctype != null && doctype.getOwnerDocument() != null) {
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"WRONG_DOCUMENT_ERR",
null);
throw new DOMException(DOMException.WRONG_DOCUMENT_ERR, msg);
}
CoreDocumentImpl doc = new CoreDocumentImpl(doctype);
Element e = doc.createElementNS(namespaceURI, qualifiedName);
doc.appendChild(e);
return doc;
}
/**
* DOM Level 3 WD - Experimental.
*/
public Object getFeature(String feature, String version) {
if (singleton.hasFeature(feature, version)){
return singleton;
}
return null;
}
// DOM L3 LS
/**
* DOM Level 3 LS CR - Experimental.
* Create a new <code>LSParser</code>. The newly constructed parser may
* then be configured by means of its <code>DOMConfiguration</code>
* object, and used to parse documents by means of its <code>parse</code>
* method.
* @param mode The <code>mode</code> argument is either
* <code>MODE_SYNCHRONOUS</code> or <code>MODE_ASYNCHRONOUS</code>, if
* <code>mode</code> is <code>MODE_SYNCHRONOUS</code> then the
* <code>LSParser</code> that is created will operate in synchronous
* mode, if it's <code>MODE_ASYNCHRONOUS</code> then the
* <code>LSParser</code> that is created will operate in asynchronous
* mode.
* @param schemaType An absolute URI representing the type of the schema
* language used during the load of a <code>Document</code> using the
* newly created <code>LSParser</code>. Note that no lexical checking
* is done on the absolute URI. In order to create a
* <code>LSParser</code> for any kind of schema types (i.e. the
* LSParser will be free to use any schema found), use the value
* <code>null</code>.
* <p ><b>Note:</b> For W3C XML Schema [<a href='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
* , applications must use the value
* <code>"http://www.w3.org/2001/XMLSchema"</code>. For XML DTD [<a href='http://www.w3.org/TR/2000/REC-xml-20001006'>XML 1.0</a>],
* applications must use the value
* <code>"http://www.w3.org/TR/REC-xml"</code>. Other Schema languages
* are outside the scope of the W3C and therefore should recommend an
* absolute URI in order to use this method.
* @return The newly created <code>LSParser</code> object. This
* <code>LSParser</code> is either synchronous or asynchronous
* depending on the value of the <code>mode</code> argument.
* <p ><b>Note:</b> By default, the newly created <code>LSParser</code>
* does not contain a <code>DOMErrorHandler</code>, i.e. the value of
* the "<a href='http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030609/core.html#parameter-error-handler'>
* error-handler</a>" configuration parameter is <code>null</code>. However, implementations
* may provide a default error handler at creation time. In that case,
* the initial value of the <code>"error-handler"</code> configuration
* parameter on the new created <code>LSParser</code> contains a
* reference to the default error handler.
* @exception DOMException
* NOT_SUPPORTED_ERR: Raised if the requested mode or schema type is
* not supported.
*/
public LSParser createLSParser(short mode, String schemaType)
throws DOMException {
if (mode == DOMImplementationLS.MODE_ASYNCHRONOUS) {
String msg =
DOMMessageFormatter.formatMessage(
DOMMessageFormatter.DOM_DOMAIN,
"NOT_SUPPORTED_ERR",
null);
throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
}
if (schemaType != null
&& schemaType.equals("http://www.w3.org/TR/REC-xml")) {
return new DOMParserImpl(
"org.apache.xerces.parsers.DTDConfiguration",
schemaType);
}
else {
// create default parser configuration validating against XMLSchemas
return new DOMParserImpl(
"org.apache.xerces.parsers.XML11Configuration",
schemaType);
}
}
/**
* DOM Level 3 LS CR - Experimental.
* Create a new <code>LSSerializer</code> object.
* @return The newly created <code>LSSerializer</code> object.
* <p ><b>Note:</b> By default, the newly created
* <code>LSSerializer</code> has no <code>DOMErrorHandler</code>,
* i.e. the value of the <code>"error-handler"</code> configuration
* parameter is <code>null</code>. However, implementations may
* provide a default error handler at creation time. In that case, the
* initial value of the <code>"error-handler"</code> configuration
* parameter on the new created <code>LSSerializer</code> contains a
* reference to the default error handler.
*/
public LSSerializer createLSSerializer() {
return new DOMSerializerImpl();
}
/**
* DOM Level 3 LS CR - Experimental.
* Create a new empty input source.
* @return The newly created input object.
*/
public LSInput createLSInput() {
return new DOMInputImpl();
}
//
// Protected methods
//
/** NON-DOM: retrieve validator. */
synchronized RevalidationHandler getValidator(String schemaType) {
// REVISIT: implement retrieving DTD validator
if (freeValidatorIndex < 0) {
// create new validator - we should not attempt
// to restrict the number of validation handlers being
// requested
return (RevalidationHandler) (ObjectFactory
.newInstance(
"org.apache.xerces.impl.xs.XMLSchemaValidator",
ObjectFactory.findClassLoader(),
true));
}
// return first available validator
RevalidationHandler val = validators[freeValidatorIndex];
validators[freeValidatorIndex--] = null;
return val;
}
/** NON-DOM: release validator */
synchronized void releaseValidator(String schemaType,
RevalidationHandler validator) {
// REVISIT: implement support for DTD validators as well
++freeValidatorIndex;
if (validators.length == freeValidatorIndex ){
// resize size of the validators
currentSize+=SIZE;
RevalidationHandler newarray[] = new RevalidationHandler[currentSize];
System.arraycopy(validators, 0, newarray, 0, validators.length);
validators = newarray;
}
validators[freeValidatorIndex]=validator;
}
/** NON-DOM: increment document/doctype counter */
protected synchronized int assignDocumentNumber() {
return ++docAndDoctypeCounter;
}
/** NON-DOM: increment document/doctype counter */
protected synchronized int assignDocTypeNumber() {
return ++docAndDoctypeCounter;
}
/* DOM Level 3 LS CR - Experimental.
*
* Create a new empty output destination object where
* <code>LSOutput.characterStream</code>,
* <code>LSOutput.byteStream</code>, <code>LSOutput.systemId</code>,
* <code>LSOutput.encoding</code> are null.
* @return The newly created output object.
*/
public LSOutput createLSOutput() {
return new DOMOutputImpl();
}
} // class DOMImplementationImpl