author | joehw |
Tue, 14 Feb 2017 10:14:06 -0800 | |
changeset 46005 | 49e2e73f90f6 |
parent 44797 | 8b3b3b911b8a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
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*/ |
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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package com.sun.org.apache.xml.internal.dtm; |
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import com.sun.org.apache.xml.internal.utils.PrefixResolver; |
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import com.sun.org.apache.xml.internal.utils.XMLStringFactory; |
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/** |
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* A DTMManager instance can be used to create DTM and |
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* DTMIterator objects, and manage the DTM objects in the system. |
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* |
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* <p>The system property that determines which Factory implementation |
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* to create is named "com.sun.org.apache.xml.internal.utils.DTMFactory". This |
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* property names a concrete subclass of the DTMFactory abstract |
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* class. If the property is not defined, a platform default is be used.</p> |
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* |
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* <p>An instance of this class <emph>must</emph> be safe to use across |
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* thread instances. It is expected that a client will create a single instance |
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* of a DTMManager to use across multiple threads. This will allow sharing |
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* of DTMs across multiple processes.</p> |
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* |
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* <p>Note: this class is incomplete right now. It will be pretty much |
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* modeled after javax.xml.transform.TransformerFactory in terms of its |
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* factory support.</p> |
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* |
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* <p>State: In progress!!</p> |
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*/ |
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public abstract class DTMManager |
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{ |
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/** |
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* Factory for creating XMLString objects. |
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* %TBD% Make this set by the caller. |
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*/ |
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protected XMLStringFactory m_xsf = null; |
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private boolean _useServicesMechanism; |
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/** |
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* Default constructor is protected on purpose. |
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*/ |
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protected DTMManager(){} |
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/** |
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* Get the XMLStringFactory used for the DTMs. |
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* |
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* |
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* @return a valid XMLStringFactory object, or null if it hasn't been set yet. |
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*/ |
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public XMLStringFactory getXMLStringFactory() |
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{ |
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return m_xsf; |
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} |
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/** |
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* Set the XMLStringFactory used for the DTMs. |
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* |
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* |
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* @param xsf a valid XMLStringFactory object, should not be null. |
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*/ |
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public void setXMLStringFactory(XMLStringFactory xsf) |
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{ |
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m_xsf = xsf; |
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} |
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/** |
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* Obtain a new instance of a <code>DTMManager</code>. |
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* This static method creates a new factory instance |
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* using the default <code>DTMManager</code> implementation, which is |
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* <code>com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault</code>. |
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* </li> |
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* </ul> |
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* |
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* Once an application has obtained a reference to a <code> |
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* DTMManager</code> it can use the factory to configure |
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* and obtain parser instances. |
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* |
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* @return new DTMManager instance, never null. |
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* |
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* @throws DTMException |
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* if the implementation is not available or cannot be instantiated. |
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*/ |
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public static DTMManager newInstance(XMLStringFactory xsf) |
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throws DTMException |
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{ |
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final DTMManager factoryImpl = new com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault(); |
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factoryImpl.setXMLStringFactory(xsf); |
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return factoryImpl; |
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} |
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/** |
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* Get an instance of a DTM, loaded with the content from the |
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* specified source. If the unique flag is true, a new instance will |
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* always be returned. Otherwise it is up to the DTMManager to return a |
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* new instance or an instance that it already created and may be being used |
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* by someone else. |
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* |
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* (More parameters may eventually need to be added for error handling |
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* and entity resolution, and to better control selection of implementations.) |
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* |
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* @param source the specification of the source object, which may be null, |
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* in which case it is assumed that node construction will take |
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* by some other means. |
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* @param unique true if the returned DTM must be unique, probably because it |
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* is going to be mutated. |
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* @param whiteSpaceFilter Enables filtering of whitespace nodes, and may |
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* be null. |
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* @param incremental true if the DTM should be built incrementally, if |
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* possible. |
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* @param doIndexing true if the caller considers it worth it to use |
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* indexing schemes. |
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* |
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* @return a non-null DTM reference. |
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*/ |
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public abstract DTM getDTM(javax.xml.transform.Source source, |
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boolean unique, DTMWSFilter whiteSpaceFilter, |
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boolean incremental, boolean doIndexing); |
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/** |
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* Get the instance of DTM that "owns" a node handle. |
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* |
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* @param nodeHandle the nodeHandle. |
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* |
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* @return a non-null DTM reference. |
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*/ |
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public abstract DTM getDTM(int nodeHandle); |
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/** |
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* Given a W3C DOM node, try and return a DTM handle. |
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* Note: calling this may be non-optimal. |
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* |
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* @param node Non-null reference to a DOM node. |
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* |
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* @return a valid DTM handle. |
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*/ |
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public abstract int getDTMHandleFromNode(org.w3c.dom.Node node); |
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/** |
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* Creates a DTM representing an empty <code>DocumentFragment</code> object. |
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* @return a non-null DTM reference. |
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*/ |
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public abstract DTM createDocumentFragment(); |
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/** |
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* Release a DTM either to a lru pool, or completely remove reference. |
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* DTMs without system IDs are always hard deleted. |
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* State: experimental. |
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* |
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* @param dtm The DTM to be released. |
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* @param shouldHardDelete True if the DTM should be removed no matter what. |
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* @return true if the DTM was removed, false if it was put back in a lru pool. |
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*/ |
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public abstract boolean release(DTM dtm, boolean shouldHardDelete); |
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/** |
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* Create a new <code>DTMIterator</code> based on an XPath |
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* <a href="http://www.w3.org/TR/xpath#NT-LocationPath>LocationPath</a> or |
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* a <a href="http://www.w3.org/TR/xpath#NT-UnionExpr">UnionExpr</a>. |
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* |
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* @param xpathCompiler ??? Somehow we need to pass in a subpart of the |
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* expression. I hate to do this with strings, since the larger expression |
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* has already been parsed. |
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* |
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* @param pos The position in the expression. |
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* @return The newly created <code>DTMIterator</code>. |
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*/ |
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public abstract DTMIterator createDTMIterator(Object xpathCompiler, |
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int pos); |
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/** |
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* Create a new <code>DTMIterator</code> based on an XPath |
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* <a href="http://www.w3.org/TR/xpath#NT-LocationPath>LocationPath</a> or |
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* a <a href="http://www.w3.org/TR/xpath#NT-UnionExpr">UnionExpr</a>. |
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* |
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* @param xpathString Must be a valid string expressing a |
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* <a href="http://www.w3.org/TR/xpath#NT-LocationPath>LocationPath</a> or |
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* a <a href="http://www.w3.org/TR/xpath#NT-UnionExpr">UnionExpr</a>. |
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* |
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* @param presolver An object that can resolve prefixes to namespace URLs. |
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* |
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* @return The newly created <code>DTMIterator</code>. |
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*/ |
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public abstract DTMIterator createDTMIterator(String xpathString, |
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PrefixResolver presolver); |
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/** |
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* Create a new <code>DTMIterator</code> based only on a whatToShow |
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* and a DTMFilter. The traversal semantics are defined as the |
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* descendant access. |
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* <p> |
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* Note that DTMIterators may not be an exact match to DOM |
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* NodeIterators. They are initialized and used in much the same way |
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* as a NodeIterator, but their response to document mutation is not |
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* currently defined. |
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* |
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* @param whatToShow This flag specifies which node types may appear in |
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* the logical view of the tree presented by the iterator. See the |
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* description of <code>NodeFilter</code> for the set of possible |
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* <code>SHOW_</code> values.These flags can be combined using |
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* <code>OR</code>. |
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* @param filter The <code>NodeFilter</code> to be used with this |
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* <code>DTMFilter</code>, or <code>null</code> to indicate no filter. |
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* @param entityReferenceExpansion The value of this flag determines |
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* whether entity reference nodes are expanded. |
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* |
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* @return The newly created <code>DTMIterator</code>. |
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*/ |
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public abstract DTMIterator createDTMIterator(int whatToShow, |
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DTMFilter filter, boolean entityReferenceExpansion); |
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/** |
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* Create a new <code>DTMIterator</code> that holds exactly one node. |
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* |
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* @param node The node handle that the DTMIterator will iterate to. |
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* |
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* @return The newly created <code>DTMIterator</code>. |
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*/ |
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public abstract DTMIterator createDTMIterator(int node); |
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/* Flag indicating whether an incremental transform is desired */ |
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public boolean m_incremental = false; |
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/* |
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* Flag set by FEATURE_SOURCE_LOCATION. |
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* This feature specifies whether the transformation phase should |
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* keep track of line and column numbers for the input source |
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* document. |
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*/ |
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public boolean m_source_location = false; |
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/** |
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* Get a flag indicating whether an incremental transform is desired |
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* @return incremental boolean. |
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* |
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*/ |
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public boolean getIncremental() |
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{ |
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return m_incremental; |
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} |
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/** |
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* Set a flag indicating whether an incremental transform is desired |
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* This flag should have the same value as the FEATURE_INCREMENTAL feature |
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* which is set by the TransformerFactory.setAttribut() method before a |
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* DTMManager is created |
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* @param incremental boolean to use to set m_incremental. |
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* |
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*/ |
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public void setIncremental(boolean incremental) |
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{ |
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m_incremental = incremental; |
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} |
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/** |
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* Get a flag indicating whether the transformation phase should |
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* keep track of line and column numbers for the input source |
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* document. |
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* @return source location boolean |
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* |
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*/ |
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public boolean getSource_location() |
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{ |
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return m_source_location; |
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} |
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/** |
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* Set a flag indicating whether the transformation phase should |
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* keep track of line and column numbers for the input source |
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* document. |
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* This flag should have the same value as the FEATURE_SOURCE_LOCATION feature |
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* which is set by the TransformerFactory.setAttribut() method before a |
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* DTMManager is created |
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* @param sourceLocation boolean to use to set m_source_location |
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*/ |
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public void setSource_location(boolean sourceLocation){ |
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m_source_location = sourceLocation; |
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} |
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/** |
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* Return the state of the services mechanism feature. |
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*/ |
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public boolean useServicesMechnism() { |
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return _useServicesMechanism; |
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} |
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/** |
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* Set the state of the services mechanism feature. |
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*/ |
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public void setServicesMechnism(boolean flag) { |
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_useServicesMechanism = flag; |
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} |
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// -------------------- private methods -------------------- |
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/** This value, set at compile time, controls how many bits of the |
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* DTM node identifier numbers are used to identify a node within a |
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* document, and thus sets the maximum number of nodes per |
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* document. The remaining bits are used to identify the DTM |
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* document which contains this node. |
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* |
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* If you change IDENT_DTM_NODE_BITS, be sure to rebuild _ALL_ the |
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* files which use it... including the IDKey testcases. |
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* |
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* (FuncGenerateKey currently uses the node identifier directly and |
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* thus is affected when this changes. The IDKEY results will still be |
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* _correct_ (presuming no other breakage), but simple equality |
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* comparison against the previous "golden" files will probably |
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* complain.) |
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* */ |
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public static final int IDENT_DTM_NODE_BITS = 16; |
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/** When this bitmask is ANDed with a DTM node handle number, the result |
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* is the low bits of the node's index number within that DTM. To obtain |
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* the high bits, add the DTM ID portion's offset as assigned in the DTM |
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* Manager. |
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*/ |
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public static final int IDENT_NODE_DEFAULT = (1<<IDENT_DTM_NODE_BITS)-1; |
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/** When this bitmask is ANDed with a DTM node handle number, the result |
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* is the DTM's document identity number. |
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*/ |
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public static final int IDENT_DTM_DEFAULT = ~IDENT_NODE_DEFAULT; |
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/** This is the maximum number of DTMs available. The highest DTM is |
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* one less than this. |
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*/ |
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public static final int IDENT_MAX_DTMS = (IDENT_DTM_DEFAULT >>> IDENT_DTM_NODE_BITS) + 1; |
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/** |
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* %TBD% Doc |
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* |
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* NEEDSDOC @param dtm |
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* |
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* NEEDSDOC ($objectName$) @return |
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*/ |
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public abstract int getDTMIdentity(DTM dtm); |
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/** |
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* %TBD% Doc |
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* |
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* NEEDSDOC ($objectName$) @return |
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*/ |
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public int getDTMIdentityMask() |
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{ |
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return IDENT_DTM_DEFAULT; |
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} |
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/** |
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* %TBD% Doc |
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* |
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* NEEDSDOC ($objectName$) @return |
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*/ |
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public int getNodeIdentityMask() |
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{ |
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return IDENT_NODE_DEFAULT; |
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} |
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} |