/** Reset for new run. */
public void reset() {
releaseDTMXRTreeFrags();
// These couldn't be disposed of earlier (see comments in release()); zap them now.
if (m_rtfdtm_stack != null)
for (java.util.Enumeration e = m_rtfdtm_stack.elements(); e.hasMoreElements(); )
m_dtmManager.release((DTM) e.nextElement(), true);
m_rtfdtm_stack = null; // drop our references too
m_which_rtfdtm = -1;
if (m_global_rtfdtm != null) m_dtmManager.release(m_global_rtfdtm, true);
m_global_rtfdtm = null;
m_dtmManager =
DTMManager.newInstance(org.apache.xpath.objects.XMLStringFactoryImpl.getFactory());
m_saxLocations.removeAllElements();
m_axesIteratorStack.removeAllElements();
m_contextNodeLists.removeAllElements();
m_currentExpressionNodes.removeAllElements();
m_currentNodes.removeAllElements();
m_iteratorRoots.RemoveAllNoClear();
m_predicatePos.removeAllElements();
m_predicateRoots.RemoveAllNoClear();
m_prefixResolvers.removeAllElements();
m_prefixResolvers.push(null);
m_currentNodes.push(DTM.NULL);
m_currentExpressionNodes.push(DTM.NULL);
m_saxLocations.push(null);
}
/**
* Default class for the runtime execution context for XPath.
*
* <p>This class extends DTMManager but does not directly implement it.
*
* @xsl.usage advanced
*/
public class XPathContext extends DTMManager // implements ExpressionContext
{
IntStack m_last_pushed_rtfdtm = new IntStack();
/**
* Stack of cached "reusable" DTMs for Result Tree Fragments. This is a kluge to handle the
* problem of starting an RTF before the old one is complete.
*
* <p>%REVIEW% I'm using a Vector rather than Stack so we can reuse the DTMs if the problem occurs
* multiple times. I'm not sure that's really a net win versus discarding the DTM and starting a
* new one... but the retained RTF DTM will have been tail-pruned so should be small.
*/
private Vector m_rtfdtm_stack = null;
/** Index of currently active RTF DTM in m_rtfdtm_stack */
private int m_which_rtfdtm = -1;
/**
* Most recent "reusable" DTM for Global Result Tree Fragments. No stack is required since we're
* never going to pop these.
*/
private SAX2RTFDTM m_global_rtfdtm = null;
/**
* HashMap of cached the DTMXRTreeFrag objects, which are identified by DTM IDs. The object are
* just wrappers for DTMs which are used in XRTreeFrag.
*/
private HashMap m_DTMXRTreeFrags = null;
/** state of the secure processing feature. */
private boolean m_isSecureProcessing = false;
/**
* Though XPathContext context extends the DTMManager, it really is a proxy for this object, which
* is the real DTMManager.
*/
protected DTMManager m_dtmManager =
DTMManager.newInstance(org.apache.xpath.objects.XMLStringFactoryImpl.getFactory());
/**
* Return the DTMManager object. Though XPathContext context extends the DTMManager, it really is
* a proxy for the real DTMManager. If a caller needs to make a lot of calls to the DTMManager, it
* is faster if it gets the real one from this function.
*/
public DTMManager getDTMManager() {
return m_dtmManager;
}
/** Set the state of the secure processing feature */
public void setSecureProcessing(boolean flag) {
m_isSecureProcessing = flag;
}
/** Return the state of the secure processing feature */
public boolean isSecureProcessing() {
return m_isSecureProcessing;
}
/**
* 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. (I
* think more parameters will need to be added for error handling, and entity resolution).
*
* @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 wsfilter Enables filtering of whitespace nodes, and may be null.
* @param incremental true if the construction should try and be incremental.
* @param doIndexing true if the caller considers it worth it to use indexing schemes.
* @return a non-null DTM reference.
*/
public DTM getDTM(
javax.xml.transform.Source source,
boolean unique,
DTMWSFilter wsfilter,
boolean incremental,
boolean doIndexing) {
return m_dtmManager.getDTM(source, unique, wsfilter, incremental, doIndexing);
}
/**
* Get an instance of a DTM that "owns" a node handle.
*
* @param nodeHandle the nodeHandle.
* @return a non-null DTM reference.
*/
public DTM getDTM(int nodeHandle) {
return m_dtmManager.getDTM(nodeHandle);
}
/**
* 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 int getDTMHandleFromNode(org.w3c.dom.Node node) {
return m_dtmManager.getDTMHandleFromNode(node);
}
//
//
/** %TBD% Doc */
public int getDTMIdentity(DTM dtm) {
return m_dtmManager.getDTMIdentity(dtm);
}
//
/**
* Creates an empty <code>DocumentFragment</code> object.
*
* @return A new <code>DocumentFragment handle</code>.
*/
public DTM createDocumentFragment() {
return m_dtmManager.createDocumentFragment();
}
//
/**
* 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 boolean release(DTM dtm, boolean shouldHardDelete) {
// %REVIEW% If it's a DTM which may contain multiple Result Tree
// Fragments, we can't discard it unless we know not only that it
// is empty, but that the XPathContext itself is going away. So do
// _not_ accept the request. (May want to do it as part of
// reset(), though.)
if (m_rtfdtm_stack != null && m_rtfdtm_stack.contains(dtm)) {
return false;
}
return m_dtmManager.release(dtm, shouldHardDelete);
}
/**
* 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 DTMIterator createDTMIterator(Object xpathCompiler, int pos) {
return m_dtmManager.createDTMIterator(xpathCompiler, pos);
}
//
/**
* 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 DTMIterator createDTMIterator(String xpathString, PrefixResolver presolver) {
return m_dtmManager.createDTMIterator(xpathString, presolver);
}
//
/**
* Create a new <code>DTMIterator</code> based only on a whatToShow and a DTMFilter. The traversal
* semantics are defined as the descendant access.
*
* @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>TreeWalker</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>NodeIterator</code>.
*/
public DTMIterator createDTMIterator(
int whatToShow, DTMFilter filter, boolean entityReferenceExpansion) {
return m_dtmManager.createDTMIterator(whatToShow, filter, entityReferenceExpansion);
}
/**
* 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 DTMIterator createDTMIterator(int node) {
// DescendantIterator iter = new DescendantIterator();
DTMIterator iter = new org.apache.xpath.axes.OneStepIteratorForward(Axis.SELF);
iter.setRoot(node, this);
return iter;
// return m_dtmManager.createDTMIterator(node);
}
/**
* Create an XPathContext instance. This is equivalent to calling the {@link
* #XPathContext(boolean)} constructor with the value <code>true</code>.
*/
public XPathContext() {
this(true);
}
/**
* Create an XPathContext instance.
*
* @param recursiveVarContext A <code>boolean</code> value indicating whether the XPath context
* needs to support pushing of scopes for variable resolution
*/
public XPathContext(boolean recursiveVarContext) {
m_prefixResolvers.push(null);
m_currentNodes.push(DTM.NULL);
m_currentExpressionNodes.push(DTM.NULL);
m_saxLocations.push(null);
m_variableStacks = recursiveVarContext ? new VariableStack() : new VariableStack(1);
}
/**
* Create an XPathContext instance. This is equivalent to calling the constructor {@link
* #XPathContext(java.lang.Object,boolean)} with the value of the second parameter set to <code>
* true</code>.
*
* @param owner Value that can be retrieved via the getOwnerObject() method.
* @see #getOwnerObject
*/
public XPathContext(Object owner) {
this(owner, true);
}
/**
* Create an XPathContext instance.
*
* @param owner Value that can be retrieved via the getOwnerObject() method.
* @see #getOwnerObject
* @param recursiveVarContext A <code>boolean</code> value indicating whether the XPath context
* needs to support pushing of scopes for variable resolution
*/
public XPathContext(Object owner, boolean recursiveVarContext) {
this(recursiveVarContext);
m_owner = owner;
try {
m_ownerGetErrorListener = m_owner.getClass().getMethod("getErrorListener", new Class[] {});
} catch (NoSuchMethodException nsme) {
}
}
/** Reset for new run. */
public void reset() {
releaseDTMXRTreeFrags();
// These couldn't be disposed of earlier (see comments in release()); zap them now.
if (m_rtfdtm_stack != null)
for (java.util.Enumeration e = m_rtfdtm_stack.elements(); e.hasMoreElements(); )
m_dtmManager.release((DTM) e.nextElement(), true);
m_rtfdtm_stack = null; // drop our references too
m_which_rtfdtm = -1;
if (m_global_rtfdtm != null) m_dtmManager.release(m_global_rtfdtm, true);
m_global_rtfdtm = null;
m_dtmManager =
DTMManager.newInstance(org.apache.xpath.objects.XMLStringFactoryImpl.getFactory());
m_saxLocations.removeAllElements();
m_axesIteratorStack.removeAllElements();
m_contextNodeLists.removeAllElements();
m_currentExpressionNodes.removeAllElements();
m_currentNodes.removeAllElements();
m_iteratorRoots.RemoveAllNoClear();
m_predicatePos.removeAllElements();
m_predicateRoots.RemoveAllNoClear();
m_prefixResolvers.removeAllElements();
m_prefixResolvers.push(null);
m_currentNodes.push(DTM.NULL);
m_currentExpressionNodes.push(DTM.NULL);
m_saxLocations.push(null);
}
/** The current stylesheet locator. */
ObjectStack m_saxLocations = new ObjectStack(RECURSIONLIMIT);
/**
* Set the current locater in the stylesheet.
*
* @param location The location within the stylesheet.
*/
public void setSAXLocator(SourceLocator location) {
m_saxLocations.setTop(location);
}
/**
* Set the current locater in the stylesheet.
*
* @param location The location within the stylesheet.
*/
public void pushSAXLocator(SourceLocator location) {
m_saxLocations.push(location);
}
/** Push a slot on the locations stack so that setSAXLocator can be repeatedly called. */
public void pushSAXLocatorNull() {
m_saxLocations.push(null);
}
/** Pop the current locater. */
public void popSAXLocator() {
m_saxLocations.pop();
}
/**
* Get the current locater in the stylesheet.
*
* @return The location within the stylesheet, or null if not known.
*/
public SourceLocator getSAXLocator() {
return (SourceLocator) m_saxLocations.peek();
}
/**
* The owner context of this XPathContext. In the case of XSLT, this will be a Transformer object.
*/
private Object m_owner;
/**
* The owner context of this XPathContext. In the case of XSLT, this will be a Transformer object.
*/
private Method m_ownerGetErrorListener;
/**
* Get the "owner" context of this context, which should be, in the case of XSLT, the Transformer
* object. This is needed so that XSLT functions can get the Transformer.
*
* @return The owner object passed into the constructor, or null.
*/
public Object getOwnerObject() {
return m_owner;
}
// ================ VarStack ===================
/**
* The stack of Variable stacks. A VariableStack will be pushed onto this stack for each template
* invocation.
*/
private VariableStack m_variableStacks;
/**
* Get the variable stack, which is in charge of variables and parameters.
*
* @return the variable stack, which should not be null.
*/
public final VariableStack getVarStack() {
return m_variableStacks;
}
/**
* Get the variable stack, which is in charge of variables and parameters.
*
* @param varStack non-null reference to the variable stack.
*/
public final void setVarStack(VariableStack varStack) {
m_variableStacks = varStack;
}
// ================ SourceTreeManager ===================
/** The source tree manager, which associates Source objects to source tree nodes. */
private SourceTreeManager m_sourceTreeManager = new SourceTreeManager();
/**
* Get the SourceTreeManager associated with this execution context.
*
* @return the SourceTreeManager associated with this execution context.
*/
public final SourceTreeManager getSourceTreeManager() {
return m_sourceTreeManager;
}
/**
* Set the SourceTreeManager associated with this execution context.
*
* @param mgr the SourceTreeManager to be associated with this execution context.
*/
public void setSourceTreeManager(SourceTreeManager mgr) {
m_sourceTreeManager = mgr;
}
// =================================================
/** The ErrorListener where errors and warnings are to be reported. */
private ErrorListener m_errorListener;
/**
* A default ErrorListener in case our m_errorListener was not specified and our owner either does
* not have an ErrorListener or has a null one.
*/
private ErrorListener m_defaultErrorListener;
/**
* Get the ErrorListener where errors and warnings are to be reported.
*
* @return A non-null ErrorListener reference.
*/
public final ErrorListener getErrorListener() {
if (null != m_errorListener) return m_errorListener;
ErrorListener retval = null;
try {
if (null != m_ownerGetErrorListener)
retval = (ErrorListener) m_ownerGetErrorListener.invoke(m_owner, new Object[] {});
} catch (Exception e) {
}
if (null == retval) {
if (null == m_defaultErrorListener)
m_defaultErrorListener = new org.apache.xml.utils.DefaultErrorHandler();
retval = m_defaultErrorListener;
}
return retval;
}
/**
* Set the ErrorListener where errors and warnings are to be reported.
*
* @param listener A non-null ErrorListener reference.
*/
public void setErrorListener(ErrorListener listener) throws IllegalArgumentException {
if (listener == null)
throw new IllegalArgumentException(
XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_NULL_ERROR_HANDLER, null)); // "Null error handler");
m_errorListener = listener;
}
// =================================================
/**
* The TrAX URI Resolver for resolving URIs from the document(...) function to source tree nodes.
*/
private URIResolver m_uriResolver;
/**
* Get the URIResolver associated with this execution context.
*
* @return a URI resolver, which may be null.
*/
public final URIResolver getURIResolver() {
return m_uriResolver;
}
/**
* Set the URIResolver associated with this execution context.
*
* @param resolver the URIResolver to be associated with this execution context, may be null to
* clear an already set resolver.
*/
public void setURIResolver(URIResolver resolver) {
m_uriResolver = resolver;
}
// =================================================
/** The reader of the primary source tree. */
public XMLReader m_primaryReader;
/**
* Get primary XMLReader associated with this execution context.
*
* @return The reader of the primary source tree.
*/
public final XMLReader getPrimaryReader() {
return m_primaryReader;
}
/**
* Set primary XMLReader associated with this execution context.
*
* @param reader The reader of the primary source tree.
*/
public void setPrimaryReader(XMLReader reader) {
m_primaryReader = reader;
}
// =================================================
/** Misnamed string manager for XPath messages. */
// private static XSLMessages m_XSLMessages = new XSLMessages();
/**
* Tell the user of an assertion error, and probably throw an exception.
*
* @param b If false, a TransformerException will be thrown.
* @param msg The assertion message, which should be informative.
* @throws javax.xml.transform.TransformerException if b is false.
*/
private void assertion(boolean b, String msg) throws javax.xml.transform.TransformerException {
if (!b) {
ErrorListener errorHandler = getErrorListener();
if (errorHandler != null) {
errorHandler.fatalError(
new TransformerException(
XSLMessages.createMessage(
XPATHErrorResources.ER_INCORRECT_PROGRAMMER_ASSERTION, new Object[] {msg}),
(SAXSourceLocator) this.getSAXLocator()));
}
}
}
// ==========================================================
// SECTION: Execution context state tracking
// ==========================================================
/** The current context node list. */
private Stack m_contextNodeLists = new Stack();
public Stack getContextNodeListsStack() {
return m_contextNodeLists;
}
public void setContextNodeListsStack(Stack s) {
m_contextNodeLists = s;
}
/**
* Get the current context node list.
*
* @return the <a href="http://www.w3.org/TR/xslt#dt-current-node-list">current node list</a>,
* also refered to here as a <term>context node list</term>.
*/
public final DTMIterator getContextNodeList() {
if (m_contextNodeLists.size() > 0) return (DTMIterator) m_contextNodeLists.peek();
else return null;
}
/**
* Set the current context node list.
*
* @param nl the <a href="http://www.w3.org/TR/xslt#dt-current-node-list">current node list</a>,
* also refered to here as a <term>context node list</term>.
* @xsl.usage internal
*/
public final void pushContextNodeList(DTMIterator nl) {
m_contextNodeLists.push(nl);
}
/**
* Pop the current context node list.
*
* @xsl.usage internal
*/
public final void popContextNodeList() {
if (m_contextNodeLists.isEmpty())
System.err.println("Warning: popContextNodeList when stack is empty!");
else m_contextNodeLists.pop();
}
/** The ammount to use for stacks that record information during the recursive execution. */
public static final int RECURSIONLIMIT = (1024 * 4);
/**
* The stack of <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a> objects. Not
* to be confused with the current node list. %REVIEW% Note that there are no bounds check and
* resize for this stack, so if it is blown, it's all over.
*/
private IntStack m_currentNodes = new IntStack(RECURSIONLIMIT);
// private NodeVector m_currentNodes = new NodeVector();
public IntStack getCurrentNodeStack() {
return m_currentNodes;
}
public void setCurrentNodeStack(IntStack nv) {
m_currentNodes = nv;
}
/**
* Get the current context node.
*
* @return the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
*/
public final int getCurrentNode() {
return m_currentNodes.peek();
}
/**
* Set the current context node and expression node.
*
* @param cn the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
* @param en the sub-expression context node.
*/
public final void pushCurrentNodeAndExpression(int cn, int en) {
m_currentNodes.push(cn);
m_currentExpressionNodes.push(cn);
}
/** Set the current context node. */
public final void popCurrentNodeAndExpression() {
m_currentNodes.quickPop(1);
m_currentExpressionNodes.quickPop(1);
}
/**
* Push the current context node, expression node, and prefix resolver.
*
* @param cn the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
* @param en the sub-expression context node.
* @param nc the namespace context (prefix resolver.
*/
public final void pushExpressionState(int cn, int en, PrefixResolver nc) {
m_currentNodes.push(cn);
m_currentExpressionNodes.push(cn);
m_prefixResolvers.push(nc);
}
/** Pop the current context node, expression node, and prefix resolver. */
public final void popExpressionState() {
m_currentNodes.quickPop(1);
m_currentExpressionNodes.quickPop(1);
m_prefixResolvers.pop();
}
/**
* Set the current context node.
*
* @param n the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
*/
public final void pushCurrentNode(int n) {
m_currentNodes.push(n);
}
/** Pop the current context node. */
public final void popCurrentNode() {
m_currentNodes.quickPop(1);
}
/** Set the current predicate root. */
public final void pushPredicateRoot(int n) {
m_predicateRoots.push(n);
}
/** Pop the current predicate root. */
public final void popPredicateRoot() {
m_predicateRoots.popQuick();
}
/** Get the current predicate root. */
public final int getPredicateRoot() {
return m_predicateRoots.peepOrNull();
}
/** Set the current location path iterator root. */
public final void pushIteratorRoot(int n) {
m_iteratorRoots.push(n);
}
/** Pop the current location path iterator root. */
public final void popIteratorRoot() {
m_iteratorRoots.popQuick();
}
/** Get the current location path iterator root. */
public final int getIteratorRoot() {
return m_iteratorRoots.peepOrNull();
}
/** A stack of the current sub-expression nodes. */
private NodeVector m_iteratorRoots = new NodeVector();
/** A stack of the current sub-expression nodes. */
private NodeVector m_predicateRoots = new NodeVector();
/** A stack of the current sub-expression nodes. */
private IntStack m_currentExpressionNodes = new IntStack(RECURSIONLIMIT);
public IntStack getCurrentExpressionNodeStack() {
return m_currentExpressionNodes;
}
public void setCurrentExpressionNodeStack(IntStack nv) {
m_currentExpressionNodes = nv;
}
private IntStack m_predicatePos = new IntStack();
public final int getPredicatePos() {
return m_predicatePos.peek();
}
public final void pushPredicatePos(int n) {
m_predicatePos.push(n);
}
public final void popPredicatePos() {
m_predicatePos.pop();
}
/**
* Get the current node that is the expression's context (i.e. for current() support).
*
* @return The current sub-expression node.
*/
public final int getCurrentExpressionNode() {
return m_currentExpressionNodes.peek();
}
/**
* Set the current node that is the expression's context (i.e. for current() support).
*
* @param n The sub-expression node to be current.
*/
public final void pushCurrentExpressionNode(int n) {
m_currentExpressionNodes.push(n);
}
/** Pop the current node that is the expression's context (i.e. for current() support). */
public final void popCurrentExpressionNode() {
m_currentExpressionNodes.quickPop(1);
}
private ObjectStack m_prefixResolvers = new ObjectStack(RECURSIONLIMIT);
/**
* Get the current namespace context for the xpath.
*
* @return the current prefix resolver for resolving prefixes to namespace URLs.
*/
public final PrefixResolver getNamespaceContext() {
return (PrefixResolver) m_prefixResolvers.peek();
}
/**
* Get the current namespace context for the xpath.
*
* @param pr the prefix resolver to be used for resolving prefixes to namespace URLs.
*/
public final void setNamespaceContext(PrefixResolver pr) {
m_prefixResolvers.setTop(pr);
}
/**
* Push a current namespace context for the xpath.
*
* @param pr the prefix resolver to be used for resolving prefixes to namespace URLs.
*/
public final void pushNamespaceContext(PrefixResolver pr) {
m_prefixResolvers.push(pr);
}
/**
* Just increment the namespace contest stack, so that setNamespaceContext can be used on the
* slot.
*/
public final void pushNamespaceContextNull() {
m_prefixResolvers.push(null);
}
/** Pop the current namespace context for the xpath. */
public final void popNamespaceContext() {
m_prefixResolvers.pop();
}
// ==========================================================
// SECTION: Current TreeWalker contexts (for internal use)
// ==========================================================
/** Stack of AxesIterators. */
private Stack m_axesIteratorStack = new Stack();
public Stack getAxesIteratorStackStacks() {
return m_axesIteratorStack;
}
public void setAxesIteratorStackStacks(Stack s) {
m_axesIteratorStack = s;
}
/**
* Push a TreeWalker on the stack.
*
* @param iter A sub-context AxesWalker.
* @xsl.usage internal
*/
public final void pushSubContextList(SubContextList iter) {
m_axesIteratorStack.push(iter);
}
/**
* Pop the last pushed axes iterator.
*
* @xsl.usage internal
*/
public final void popSubContextList() {
m_axesIteratorStack.pop();
}
/**
* Get the current axes iterator, or return null if none.
*
* @return the sub-context node list.
* @xsl.usage internal
*/
public SubContextList getSubContextList() {
return m_axesIteratorStack.isEmpty() ? null : (SubContextList) m_axesIteratorStack.peek();
}
/**
* Get the <a href="http://www.w3.org/TR/xslt#dt-current-node-list">current node list</a> as
* defined by the XSLT spec.
*
* @return the <a href="http://www.w3.org/TR/xslt#dt-current-node-list">current node list</a>.
* @xsl.usage internal
*/
public org.apache.xpath.axes.SubContextList getCurrentNodeList() {
return m_axesIteratorStack.isEmpty() ? null : (SubContextList) m_axesIteratorStack.elementAt(0);
}
// ==========================================================
// SECTION: Implementation of ExpressionContext interface
// ==========================================================
/**
* Get the current context node.
*
* @return The current context node.
*/
public final int getContextNode() {
return this.getCurrentNode();
}
/**
* Get the current context node list.
*
* @return An iterator for the current context list, as defined in XSLT.
*/
public final DTMIterator getContextNodes() {
try {
DTMIterator cnl = getContextNodeList();
if (null != cnl) return cnl.cloneWithReset();
else return null; // for now... this might ought to be an empty iterator.
} catch (CloneNotSupportedException cnse) {
return null; // error reporting?
}
}
XPathExpressionContext expressionContext = new XPathExpressionContext();
/**
* The the expression context for extensions for this context.
*
* @return An object that implements the ExpressionContext.
*/
public ExpressionContext getExpressionContext() {
return expressionContext;
}
public class XPathExpressionContext implements ExpressionContext {
/**
* Return the XPathContext associated with this XPathExpressionContext. Extensions should use
* this judiciously and only when special processing requirements cannot be met another way.
* Consider requesting an enhancement to the ExpressionContext interface to avoid having to call
* this method.
*
* @return the XPathContext associated with this XPathExpressionContext.
*/
public XPathContext getXPathContext() {
return XPathContext.this;
}
/**
* Return the DTMManager object. Though XPathContext context extends the DTMManager, it really
* is a proxy for the real DTMManager. If a caller needs to make a lot of calls to the
* DTMManager, it is faster if it gets the real one from this function.
*/
public DTMManager getDTMManager() {
return m_dtmManager;
}
/**
* Get the current context node.
*
* @return The current context node.
*/
public org.w3c.dom.Node getContextNode() {
int context = getCurrentNode();
return getDTM(context).getNode(context);
}
/**
* Get the current context node list.
*
* @return An iterator for the current context list, as defined in XSLT.
*/
public org.w3c.dom.traversal.NodeIterator getContextNodes() {
return new org.apache.xml.dtm.ref.DTMNodeIterator(getContextNodeList());
}
/**
* Get the error listener.
*
* @return The registered error listener.
*/
public ErrorListener getErrorListener() {
return XPathContext.this.getErrorListener();
}
/**
* Get the value of a node as a number.
*
* @param n Node to be converted to a number. May be null.
* @return value of n as a number.
*/
public double toNumber(org.w3c.dom.Node n) {
// %REVIEW% You can't get much uglier than this...
int nodeHandle = getDTMHandleFromNode(n);
DTM dtm = getDTM(nodeHandle);
XString xobj = (XString) dtm.getStringValue(nodeHandle);
return xobj.num();
}
/**
* Get the value of a node as a string.
*
* @param n Node to be converted to a string. May be null.
* @return value of n as a string, or an empty string if n is null.
*/
public String toString(org.w3c.dom.Node n) {
// %REVIEW% You can't get much uglier than this...
int nodeHandle = getDTMHandleFromNode(n);
DTM dtm = getDTM(nodeHandle);
XMLString strVal = dtm.getStringValue(nodeHandle);
return strVal.toString();
}
/**
* Get a variable based on it's qualified name.
*
* @param qname The qualified name of the variable.
* @return The evaluated value of the variable.
* @throws javax.xml.transform.TransformerException
*/
public final XObject getVariableOrParam(org.apache.xml.utils.QName qname)
throws javax.xml.transform.TransformerException {
return m_variableStacks.getVariableOrParam(XPathContext.this, qname);
}
}
/**
* Get a DTM to be used as a container for a global Result Tree Fragment. This will always be an
* instance of (derived from? equivalent to?) SAX2DTM, since each RTF is constructed by
* temporarily redirecting our SAX output to it. It may be a single DTM containing for multiple
* fragments, if the implementation supports that.
*
* <p>Note: The distinction between this method and getRTFDTM() is that the latter allocates space
* from the dynamic variable stack (m_rtfdtm_stack), which may be pruned away again as the
* templates which defined those variables are exited. Global variables may be bound late (see
* XUnresolvedVariable), and never want to be discarded, hence we need to allocate them separately
* and don't actually need a stack to track them.
*
* @return a non-null DTM reference.
*/
public DTM getGlobalRTFDTM() {
// We probably should _NOT_ be applying whitespace filtering at this stage!
//
// Some magic has been applied in DTMManagerDefault to recognize this set of options
// and generate an instance of DTM which can contain multiple documents
// (SAX2RTFDTM). Perhaps not the optimal way of achieving that result, but
// I didn't want to change the manager API at this time, or expose
// too many dependencies on its internals. (Ideally, I'd like to move
// isTreeIncomplete all the way up to DTM, so we wouldn't need to explicitly
// specify the subclass here.)
// If it doesn't exist, or if the one already existing is in the middle of
// being constructed, we need to obtain a new DTM to write into. I'm not sure
// the latter will ever arise, but I'd rather be just a bit paranoid..
if (m_global_rtfdtm == null || m_global_rtfdtm.isTreeIncomplete()) {
m_global_rtfdtm = (SAX2RTFDTM) m_dtmManager.getDTM(null, true, null, false, false);
}
return m_global_rtfdtm;
}
/**
* Get a DTM to be used as a container for a dynamic Result Tree Fragment. This will always be an
* instance of (derived from? equivalent to?) SAX2DTM, since each RTF is constructed by
* temporarily redirecting our SAX output to it. It may be a single DTM containing for multiple
* fragments, if the implementation supports that.
*
* @return a non-null DTM reference.
*/
public DTM getRTFDTM() {
SAX2RTFDTM rtfdtm;
// We probably should _NOT_ be applying whitespace filtering at this stage!
//
// Some magic has been applied in DTMManagerDefault to recognize this set of options
// and generate an instance of DTM which can contain multiple documents
// (SAX2RTFDTM). Perhaps not the optimal way of achieving that result, but
// I didn't want to change the manager API at this time, or expose
// too many dependencies on its internals. (Ideally, I'd like to move
// isTreeIncomplete all the way up to DTM, so we wouldn't need to explicitly
// specify the subclass here.)
if (m_rtfdtm_stack == null) {
m_rtfdtm_stack = new Vector();
rtfdtm = (SAX2RTFDTM) m_dtmManager.getDTM(null, true, null, false, false);
m_rtfdtm_stack.addElement(rtfdtm);
++m_which_rtfdtm;
} else if (m_which_rtfdtm < 0) {
rtfdtm = (SAX2RTFDTM) m_rtfdtm_stack.elementAt(++m_which_rtfdtm);
} else {
rtfdtm = (SAX2RTFDTM) m_rtfdtm_stack.elementAt(m_which_rtfdtm);
// It might already be under construction -- the classic example would be
// an xsl:variable which uses xsl:call-template as part of its value. To
// handle this recursion, we have to start a new RTF DTM, pushing the old
// one onto a stack so we can return to it. This is not as uncommon a case
// as we might wish, unfortunately, as some folks insist on coding XSLT
// as if it were a procedural language...
if (rtfdtm.isTreeIncomplete()) {
if (++m_which_rtfdtm < m_rtfdtm_stack.size())
rtfdtm = (SAX2RTFDTM) m_rtfdtm_stack.elementAt(m_which_rtfdtm);
else {
rtfdtm = (SAX2RTFDTM) m_dtmManager.getDTM(null, true, null, false, false);
m_rtfdtm_stack.addElement(rtfdtm);
}
}
}
return rtfdtm;
}
/**
* Push the RTFDTM's context mark, to allows discarding RTFs added after this point. (If it
* doesn't exist we don't push, since we might still be able to get away with not creating it.
* That requires that excessive pops be harmless.)
*/
public void pushRTFContext() {
m_last_pushed_rtfdtm.push(m_which_rtfdtm);
if (null != m_rtfdtm_stack) ((SAX2RTFDTM) (getRTFDTM())).pushRewindMark();
}
/**
* Pop the RTFDTM's context mark. This discards any RTFs added after the last mark was set.
*
* <p>If there is no RTF DTM, there's nothing to pop so this becomes a no-op. If pushes were
* issued before this was called, we count on the fact that popRewindMark is defined such that
* overpopping just resets to empty.
*
* <p>Complicating factor: We need to handle the case of popping back to a previous RTF DTM, if
* one of the weird produce-an-RTF-to-build-an-RTF cases arose. Basically: If pop says this DTM is
* now empty, then return to the previous if one exists, in whatever state we left it in. UGLY,
* but hopefully the situation which forces us to consider this will arise exceedingly rarely.
*/
public void popRTFContext() {
int previous = m_last_pushed_rtfdtm.pop();
if (null == m_rtfdtm_stack) return;
if (m_which_rtfdtm == previous) {
if (previous >= 0) // guard against none-active
{
boolean isEmpty = ((SAX2RTFDTM) (m_rtfdtm_stack.elementAt(previous))).popRewindMark();
}
} else
while (m_which_rtfdtm != previous) {
// Empty each DTM before popping, so it's ready for reuse
// _DON'T_ pop the previous, since it's still open (which is why we
// stacked up more of these) and did not receive a mark.
boolean isEmpty = ((SAX2RTFDTM) (m_rtfdtm_stack.elementAt(m_which_rtfdtm))).popRewindMark();
--m_which_rtfdtm;
}
}
/**
* Gets DTMXRTreeFrag object if one has already been created. Creates new DTMXRTreeFrag object and
* adds to m_DTMXRTreeFrags HashMap, otherwise.
*
* @param dtmIdentity
* @return DTMXRTreeFrag
*/
public DTMXRTreeFrag getDTMXRTreeFrag(int dtmIdentity) {
if (m_DTMXRTreeFrags == null) {
m_DTMXRTreeFrags = new HashMap();
}
if (m_DTMXRTreeFrags.containsKey(new Integer(dtmIdentity))) {
return (DTMXRTreeFrag) m_DTMXRTreeFrags.get(new Integer(dtmIdentity));
} else {
final DTMXRTreeFrag frag = new DTMXRTreeFrag(dtmIdentity, this);
m_DTMXRTreeFrags.put(new Integer(dtmIdentity), frag);
return frag;
}
}
/** Cleans DTMXRTreeFrag objects by removing references to DTM and XPathContext objects. */
private final void releaseDTMXRTreeFrags() {
if (m_DTMXRTreeFrags == null) {
return;
}
final Iterator iter = (m_DTMXRTreeFrags.values()).iterator();
while (iter.hasNext()) {
DTMXRTreeFrag frag = (DTMXRTreeFrag) iter.next();
frag.destruct();
iter.remove();
}
m_DTMXRTreeFrags = null;
}
}