/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sun.org.apache.xerces.internal.dom;
import com.sun.org.apache.xerces.internal.impl.RevalidationHandler;
import com.sun.org.apache.xerces.internal.parsers.DOMParserImpl;
import com.sun.org.apache.xerces.internal.util.XMLChar;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
import com.sun.org.apache.xml.internal.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.
*
* @xerces.internal
*
* @version $Id: CoreDOMImplementationImpl.java,v 1.2.6.1 2005/08/30 14:57:58 sunithareddy 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 RevalidationHandler dtdValidators[] = new RevalidationHandler[SIZE];
private int freeValidatorIndex = -1;
private int freeDTDValidatorIndex = -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, com.sun.org.apache.xerces.internal.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) {
boolean anyVersion = version == null || version.length() == 0;
// check if Xalan implementation is around and if yes report true for supporting
// XPath API
// if a plus sign "+" is prepended to any feature name, implementations
// are considered in which the specified feature may not be directly
// castable DOMImplementation.getFeature(feature, version). Without a
// plus, only features whose interfaces are directly castable are considered.
if ((feature.equalsIgnoreCase("+XPath"))
&& (anyVersion || version.equals("3.0"))) {
try {
Class xpathClass = ObjectFactory.findProviderClass(
"com.sun.org.apache.xpath.internal.domapi.XPathEvaluatorImpl",
ObjectFactory.findClassLoader(), true);
// Check if the DOM XPath implementation implements
// the interface org.w3c.dom.XPathEvaluator
Class interfaces[] = xpathClass.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
if (interfaces[i].getName().equals(
"org.w3c.dom.xpath.XPathEvaluator")) {
return true;
}
}
} catch (Exception e) {
return false;
}
return true;
}
if (feature.startsWith("+")) {
feature = feature.substring(1);
}
return (
feature.equalsIgnoreCase("Core")
&& (anyVersion
|| version.equals("1.0")
|| version.equals("2.0")
|| version.equals("3.0")))
|| (feature.equalsIgnoreCase("XML")
&& (anyVersion
|| version.equals("1.0")
|| version.equals("2.0")
|| version.equals("3.0")))
|| (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)) {
if ((feature.equalsIgnoreCase("+XPath"))) {
try {
Class xpathClass = ObjectFactory.findProviderClass(
"com.sun.org.apache.xpath.internal.domapi.XPathEvaluatorImpl",
ObjectFactory.findClassLoader(), true);
// Check if the DOM XPath implementation implements
// the interface org.w3c.dom.XPathEvaluator
Class interfaces[] = xpathClass.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
if (interfaces[i].getName().equals(
"org.w3c.dom.xpath.XPathEvaluator")) {
return xpathClass.newInstance();
}
}
} catch (Exception e) {
return null;
}
} else {
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_SYNCHRONOUS || (schemaType !=null &&
!"http://www.w3.org/2001/XMLSchema".equals(schemaType) &&
!"http://www.w3.org/TR/REC-xml".equals(schemaType))) {
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(
"com.sun.org.apache.xerces.internal.parsers.DTDConfiguration",
schemaType);
}
else {
// create default parser configuration validating against XMLSchemas
return new DOMParserImpl(
"com.sun.org.apache.xerces.internal.parsers.XIncludeAwareParserConfiguration",
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 (schemaType == XMLGrammarDescription.XML_SCHEMA) {
// create new validator - we should not attempt
// to restrict the number of validation handlers being
// requested
if(freeValidatorIndex < 0) {
return (RevalidationHandler) (ObjectFactory
.newInstance(
"com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator",
ObjectFactory.findClassLoader(),
true));
}
// return first available validator
RevalidationHandler val = validators[freeValidatorIndex];
validators[freeValidatorIndex--] = null;
return val;
}
else if(schemaType == XMLGrammarDescription.XML_DTD) {
if(freeDTDValidatorIndex < 0) {
return (RevalidationHandler) (ObjectFactory
.newInstance(
"com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator",
ObjectFactory.findClassLoader(),
true));
}
// return first available validator
RevalidationHandler val = dtdValidators[freeDTDValidatorIndex];
dtdValidators[freeDTDValidatorIndex--] = null;
return val;
}
return null;
}
/** NON-DOM: release validator */
synchronized void releaseValidator(String schemaType,
RevalidationHandler validator) {
// REVISIT: implement support for DTD validators as well
if(schemaType == XMLGrammarDescription.XML_SCHEMA) {
++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;
}
else if(schemaType == XMLGrammarDescription.XML_DTD) {
++freeDTDValidatorIndex;
if (dtdValidators.length == freeDTDValidatorIndex ){
// resize size of the validators
currentSize+=SIZE;
RevalidationHandler newarray[] = new RevalidationHandler[currentSize];
System.arraycopy(dtdValidators, 0, newarray, 0, dtdValidators.length);
dtdValidators = newarray;
}
dtdValidators[freeDTDValidatorIndex]=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
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