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package com.sun.org.apache.xml.internal.dtm;

import com.sun.org.apache.xml.internal.utils.PrefixResolver;
import com.sun.org.apache.xml.internal.utils.XMLStringFactory;

A DTMManager instance can be used to create DTM and DTMIterator objects, and manage the DTM objects in the system.

The system property that determines which Factory implementation to create is named "com.sun.org.apache.xml.internal.utils.DTMFactory". This property names a concrete subclass of the DTMFactory abstract class. If the property is not defined, a platform default is be used.

An instance of this class must be safe to use across thread instances. It is expected that a client will create a single instance of a DTMManager to use across multiple threads. This will allow sharing of DTMs across multiple processes.

Note: this class is incomplete right now. It will be pretty much modeled after javax.xml.transform.TransformerFactory in terms of its factory support.

State: In progress!!

/** * A DTMManager instance can be used to create DTM and * DTMIterator objects, and manage the DTM objects in the system. * * <p>The system property that determines which Factory implementation * to create is named "com.sun.org.apache.xml.internal.utils.DTMFactory". This * property names a concrete subclass of the DTMFactory abstract * class. If the property is not defined, a platform default is be used.</p> * * <p>An instance of this class <emph>must</emph> be safe to use across * thread instances. It is expected that a client will create a single instance * of a DTMManager to use across multiple threads. This will allow sharing * of DTMs across multiple processes.</p> * * <p>Note: this class is incomplete right now. It will be pretty much * modeled after javax.xml.transform.TransformerFactory in terms of its * factory support.</p> * * <p>State: In progress!!</p> */
public abstract class DTMManager {
Factory for creating XMLString objects. %TBD% Make this set by the caller.
/** * Factory for creating XMLString objects. * %TBD% Make this set by the caller. */
protected XMLStringFactory m_xsf = null; private boolean _overrideDefaultParser;
Default constructor is protected on purpose.
/** * Default constructor is protected on purpose. */
protected DTMManager(){}
Get the XMLStringFactory used for the DTMs.
Returns:a valid XMLStringFactory object, or null if it hasn't been set yet.
/** * Get the XMLStringFactory used for the DTMs. * * * @return a valid XMLStringFactory object, or null if it hasn't been set yet. */
public XMLStringFactory getXMLStringFactory() { return m_xsf; }
Set the XMLStringFactory used for the DTMs.
Params:
  • xsf – a valid XMLStringFactory object, should not be null.
/** * Set the XMLStringFactory used for the DTMs. * * * @param xsf a valid XMLStringFactory object, should not be null. */
public void setXMLStringFactory(XMLStringFactory xsf) { m_xsf = xsf; }
Obtain a new instance of a DTMManager. This static method creates a new factory instance using the default DTMManager implementation, which is com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault. Once an application has obtained a reference to a DTMManager it can use the factory to configure and obtain parser instances.
Throws:
  • DTMException – if the implementation is not available or cannot be instantiated.
Returns:new DTMManager instance, never null.
/** * Obtain a new instance of a <code>DTMManager</code>. * This static method creates a new factory instance * using the default <code>DTMManager</code> implementation, which is * <code>com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault</code>. * </li> * </ul> * * Once an application has obtained a reference to a <code> * DTMManager</code> it can use the factory to configure * and obtain parser instances. * * @return new DTMManager instance, never null. * * @throws DTMException * if the implementation is not available or cannot be instantiated. */
public static DTMManager newInstance(XMLStringFactory xsf) throws DTMException { final DTMManager factoryImpl = new com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault(); factoryImpl.setXMLStringFactory(xsf); return factoryImpl; }
Get an instance of a DTM, loaded with the content from the specified source. If the unique flag is true, a new instance will always be returned. Otherwise it is up to the DTMManager to return a new instance or an instance that it already created and may be being used by someone else. (More parameters may eventually need to be added for error handling and entity resolution, and to better control selection of implementations.)
Params:
  • source – the specification of the source object, which may be null, in which case it is assumed that node construction will take by some other means.
  • unique – true if the returned DTM must be unique, probably because it is going to be mutated.
  • whiteSpaceFilter – Enables filtering of whitespace nodes, and may be null.
  • incremental – true if the DTM should be built incrementally, if possible.
  • doIndexing – true if the caller considers it worth it to use indexing schemes.
Returns:a non-null DTM reference.
/** * Get an instance of a DTM, loaded with the content from the * specified source. If the unique flag is true, a new instance will * always be returned. Otherwise it is up to the DTMManager to return a * new instance or an instance that it already created and may be being used * by someone else. * * (More parameters may eventually need to be added for error handling * and entity resolution, and to better control selection of implementations.) * * @param source the specification of the source object, which may be null, * in which case it is assumed that node construction will take * by some other means. * @param unique true if the returned DTM must be unique, probably because it * is going to be mutated. * @param whiteSpaceFilter Enables filtering of whitespace nodes, and may * be null. * @param incremental true if the DTM should be built incrementally, if * possible. * @param doIndexing true if the caller considers it worth it to use * indexing schemes. * * @return a non-null DTM reference. */
public abstract DTM getDTM(javax.xml.transform.Source source, boolean unique, DTMWSFilter whiteSpaceFilter, boolean incremental, boolean doIndexing);
Get the instance of DTM that "owns" a node handle.
Params:
  • nodeHandle – the nodeHandle.
Returns:a non-null DTM reference.
/** * Get the instance of DTM that "owns" a node handle. * * @param nodeHandle the nodeHandle. * * @return a non-null DTM reference. */
public abstract DTM getDTM(int nodeHandle);
Given a W3C DOM node, try and return a DTM handle. Note: calling this may be non-optimal.
Params:
  • node – Non-null reference to a DOM node.
Returns:a valid DTM handle.
/** * Given a W3C DOM node, try and return a DTM handle. * Note: calling this may be non-optimal. * * @param node Non-null reference to a DOM node. * * @return a valid DTM handle. */
public abstract int getDTMHandleFromNode(org.w3c.dom.Node node);
Creates a DTM representing an empty DocumentFragment object.
Returns:a non-null DTM reference.
/** * Creates a DTM representing an empty <code>DocumentFragment</code> object. * @return a non-null DTM reference. */
public abstract DTM createDocumentFragment();
Release a DTM either to a lru pool, or completely remove reference. DTMs without system IDs are always hard deleted. State: experimental.
Params:
  • dtm – The DTM to be released.
  • shouldHardDelete – True if the DTM should be removed no matter what.
Returns:true if the DTM was removed, false if it was put back in a lru pool.
/** * Release a DTM either to a lru pool, or completely remove reference. * DTMs without system IDs are always hard deleted. * State: experimental. * * @param dtm The DTM to be released. * @param shouldHardDelete True if the DTM should be removed no matter what. * @return true if the DTM was removed, false if it was put back in a lru pool. */
public abstract boolean release(DTM dtm, boolean shouldHardDelete);
Create a new DTMIterator based on an XPath UnionExpr.
Params:
  • xpathCompiler – ??? Somehow we need to pass in a subpart of the expression. I hate to do this with strings, since the larger expression has already been parsed.
  • pos – The position in the expression.
Returns:The newly created DTMIterator.
/** * Create a new <code>DTMIterator</code> based on an XPath * <a href="http://www.w3.org/TR/xpath#NT-LocationPath>LocationPath</a> or * a <a href="http://www.w3.org/TR/xpath#NT-UnionExpr">UnionExpr</a>. * * @param xpathCompiler ??? Somehow we need to pass in a subpart of the * expression. I hate to do this with strings, since the larger expression * has already been parsed. * * @param pos The position in the expression. * @return The newly created <code>DTMIterator</code>. */
public abstract DTMIterator createDTMIterator(Object xpathCompiler, int pos);
Create a new DTMIterator based on an XPath UnionExpr.
Params:
  • xpathString – Must be a valid string expressing a UnionExpr.
  • presolver – An object that can resolve prefixes to namespace URLs.
Returns:The newly created DTMIterator.
/** * Create a new <code>DTMIterator</code> based on an XPath * <a href="http://www.w3.org/TR/xpath#NT-LocationPath>LocationPath</a> or * a <a href="http://www.w3.org/TR/xpath#NT-UnionExpr">UnionExpr</a>. * * @param xpathString Must be a valid string expressing a * <a href="http://www.w3.org/TR/xpath#NT-LocationPath>LocationPath</a> or * a <a href="http://www.w3.org/TR/xpath#NT-UnionExpr">UnionExpr</a>. * * @param presolver An object that can resolve prefixes to namespace URLs. * * @return The newly created <code>DTMIterator</code>. */
public abstract DTMIterator createDTMIterator(String xpathString, PrefixResolver presolver);
Create a new DTMIterator based only on a whatToShow and a DTMFilter. The traversal semantics are defined as the descendant access.

Note that DTMIterators may not be an exact match to DOM NodeIterators. They are initialized and used in much the same way as a NodeIterator, but their response to document mutation is not currently defined.

Params:
  • whatToShow – This flag specifies which node types may appear in the logical view of the tree presented by the iterator. See the description of NodeFilter for the set of possible SHOW_ values.These flags can be combined using OR.
  • filter – The NodeFilter to be used with this DTMFilter, or null to indicate no filter.
  • entityReferenceExpansion – The value of this flag determines whether entity reference nodes are expanded.
Returns:The newly created DTMIterator.
/** * Create a new <code>DTMIterator</code> based only on a whatToShow * and a DTMFilter. The traversal semantics are defined as the * descendant access. * <p> * Note that DTMIterators may not be an exact match to DOM * NodeIterators. They are initialized and used in much the same way * as a NodeIterator, but their response to document mutation is not * currently defined. * * @param whatToShow This flag specifies which node types may appear in * the logical view of the tree presented by the iterator. See the * description of <code>NodeFilter</code> for the set of possible * <code>SHOW_</code> values.These flags can be combined using * <code>OR</code>. * @param filter The <code>NodeFilter</code> to be used with this * <code>DTMFilter</code>, or <code>null</code> to indicate no filter. * @param entityReferenceExpansion The value of this flag determines * whether entity reference nodes are expanded. * * @return The newly created <code>DTMIterator</code>. */
public abstract DTMIterator createDTMIterator(int whatToShow, DTMFilter filter, boolean entityReferenceExpansion);
Create a new DTMIterator that holds exactly one node.
Params:
  • node – The node handle that the DTMIterator will iterate to.
Returns:The newly created DTMIterator.
/** * Create a new <code>DTMIterator</code> that holds exactly one node. * * @param node The node handle that the DTMIterator will iterate to. * * @return The newly created <code>DTMIterator</code>. */
public abstract DTMIterator createDTMIterator(int node); /* Flag indicating whether an incremental transform is desired */ public boolean m_incremental = false; /* * Flag set by FEATURE_SOURCE_LOCATION. * This feature specifies whether the transformation phase should * keep track of line and column numbers for the input source * document. */ public boolean m_source_location = false;
Get a flag indicating whether an incremental transform is desired
Returns:incremental boolean.
/** * Get a flag indicating whether an incremental transform is desired * @return incremental boolean. * */
public boolean getIncremental() { return m_incremental; }
Set a flag indicating whether an incremental transform is desired This flag should have the same value as the FEATURE_INCREMENTAL feature which is set by the TransformerFactory.setAttribut() method before a DTMManager is created
Params:
  • incremental – boolean to use to set m_incremental.
/** * Set a flag indicating whether an incremental transform is desired * This flag should have the same value as the FEATURE_INCREMENTAL feature * which is set by the TransformerFactory.setAttribut() method before a * DTMManager is created * @param incremental boolean to use to set m_incremental. * */
public void setIncremental(boolean incremental) { m_incremental = incremental; }
Get a flag indicating whether the transformation phase should keep track of line and column numbers for the input source document.
Returns:source location boolean
/** * Get a flag indicating whether the transformation phase should * keep track of line and column numbers for the input source * document. * @return source location boolean * */
public boolean getSource_location() { return m_source_location; }
Set a flag indicating whether the transformation phase should keep track of line and column numbers for the input source document. This flag should have the same value as the FEATURE_SOURCE_LOCATION feature which is set by the TransformerFactory.setAttribut() method before a DTMManager is created
Params:
  • sourceLocation – boolean to use to set m_source_location
/** * Set a flag indicating whether the transformation phase should * keep track of line and column numbers for the input source * document. * This flag should have the same value as the FEATURE_SOURCE_LOCATION feature * which is set by the TransformerFactory.setAttribut() method before a * DTMManager is created * @param sourceLocation boolean to use to set m_source_location */
public void setSource_location(boolean sourceLocation){ m_source_location = sourceLocation; }
Return the state of the services mechanism feature.
/** * Return the state of the services mechanism feature. */
public boolean overrideDefaultParser() { return _overrideDefaultParser; }
Set the state of the services mechanism feature.
/** * Set the state of the services mechanism feature. */
public void setOverrideDefaultParser(boolean flag) { _overrideDefaultParser = flag; } // -------------------- private methods --------------------
This value, set at compile time, controls how many bits of the DTM node identifier numbers are used to identify a node within a document, and thus sets the maximum number of nodes per document. The remaining bits are used to identify the DTM document which contains this node. If you change IDENT_DTM_NODE_BITS, be sure to rebuild _ALL_ the files which use it... including the IDKey testcases. (FuncGenerateKey currently uses the node identifier directly and thus is affected when this changes. The IDKEY results will still be _correct_ (presuming no other breakage), but simple equality comparison against the previous "golden" files will probably complain.)
/** This value, set at compile time, controls how many bits of the * DTM node identifier numbers are used to identify a node within a * document, and thus sets the maximum number of nodes per * document. The remaining bits are used to identify the DTM * document which contains this node. * * If you change IDENT_DTM_NODE_BITS, be sure to rebuild _ALL_ the * files which use it... including the IDKey testcases. * * (FuncGenerateKey currently uses the node identifier directly and * thus is affected when this changes. The IDKEY results will still be * _correct_ (presuming no other breakage), but simple equality * comparison against the previous "golden" files will probably * complain.) * */
public static final int IDENT_DTM_NODE_BITS = 16;
When this bitmask is ANDed with a DTM node handle number, the result is the low bits of the node's index number within that DTM. To obtain the high bits, add the DTM ID portion's offset as assigned in the DTM Manager.
/** When this bitmask is ANDed with a DTM node handle number, the result * is the low bits of the node's index number within that DTM. To obtain * the high bits, add the DTM ID portion's offset as assigned in the DTM * Manager. */
public static final int IDENT_NODE_DEFAULT = (1<<IDENT_DTM_NODE_BITS)-1;
When this bitmask is ANDed with a DTM node handle number, the result is the DTM's document identity number.
/** When this bitmask is ANDed with a DTM node handle number, the result * is the DTM's document identity number. */
public static final int IDENT_DTM_DEFAULT = ~IDENT_NODE_DEFAULT;
This is the maximum number of DTMs available. The highest DTM is one less than this.
/** This is the maximum number of DTMs available. The highest DTM is * one less than this. */
public static final int IDENT_MAX_DTMS = (IDENT_DTM_DEFAULT >>> IDENT_DTM_NODE_BITS) + 1;
%TBD% Doc NEEDSDOC @param dtm NEEDSDOC ($objectName$) @return
/** * %TBD% Doc * * NEEDSDOC @param dtm * * NEEDSDOC ($objectName$) @return */
public abstract int getDTMIdentity(DTM dtm);
%TBD% Doc NEEDSDOC ($objectName$) @return
/** * %TBD% Doc * * NEEDSDOC ($objectName$) @return */
public int getDTMIdentityMask() { return IDENT_DTM_DEFAULT; }
%TBD% Doc NEEDSDOC ($objectName$) @return
/** * %TBD% Doc * * NEEDSDOC ($objectName$) @return */
public int getNodeIdentityMask() { return IDENT_NODE_DEFAULT; } }