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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/*
* $Id: PredicatedNodeTest.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.axes;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xpath.Expression;
import org.apache.xpath.ExpressionOwner;
import org.apache.xpath.XPathContext;
import org.apache.xpath.XPathVisitor;
import org.apache.xpath.compiler.Compiler;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.patterns.NodeTest;
public abstract class PredicatedNodeTest extends NodeTest implements SubContextList
{
static final long serialVersionUID = -6193530757296377351L;
/**
* Construct an AxesWalker using a LocPathIterator.
*
* @param locPathIterator non-null reference to the parent iterator.
*/
PredicatedNodeTest(LocPathIterator locPathIterator)
{
m_lpi = locPathIterator;
}
/**
* Construct an AxesWalker. The location path iterator will have to be set
* before use.
*/
PredicatedNodeTest()
{
}
/**
* Read the object from a serialization stream.
*
* @param stream Input stream to read from
*
* @throws java.io.IOException
* @throws javax.xml.transform.TransformerException
*/
private void readObject(java.io.ObjectInputStream stream)
throws java.io.IOException, javax.xml.transform.TransformerException
{
try
{
stream.defaultReadObject();
m_predicateIndex = -1;
resetProximityPositions();
}
catch (ClassNotFoundException cnfe)
{
throw new javax.xml.transform.TransformerException(cnfe);
}
}
/**
* Get a cloned PrdicatedNodeTest.
*
* @return A new PredicatedNodeTest that can be used without mutating this one.
*
* @throws CloneNotSupportedException
*/
public Object clone() throws CloneNotSupportedException
{
// Do not access the location path itterator during this operation!
PredicatedNodeTest clone = (PredicatedNodeTest) super.clone();
if ((null != this.m_proximityPositions)
&& (this.m_proximityPositions == clone.m_proximityPositions))
{
clone.m_proximityPositions = new int[this.m_proximityPositions.length];
System.arraycopy(this.m_proximityPositions, 0,
clone.m_proximityPositions, 0,
this.m_proximityPositions.length);
}
if(clone.m_lpi == this)
clone.m_lpi = (LocPathIterator)clone;
return clone;
}
// Only for clones for findLastPos. See bug4638.
protected int m_predCount = -1;
/**
* Get the number of predicates that this walker has.
*
* @return the number of predicates that this walker has.
*/
public int getPredicateCount()
{
if(-1 == m_predCount)
return (null == m_predicates) ? 0 : m_predicates.length;
else
return m_predCount;
}
/**
* Set the number of predicates that this walker has. This does more
* that one would think, as it creates a new predicate array of the
* size of the count argument, and copies count predicates into the new
* one from the old, and then reassigns the predicates value. All this
* to keep from having to have a predicate count value.
*
* @param count The number of predicates, which must be equal or less
* than the existing count.
*/
public void setPredicateCount(int count)
{
if(count > 0)
{
Expression[] newPredicates = new Expression[count];
for (int i = 0; i < count; i++)
{
newPredicates[i] = m_predicates[i];
}
m_predicates = newPredicates;
}
else
m_predicates = null;
}
/**
* Init predicate info.
*
* @param compiler The Compiler object that has information about this
* walker in the op map.
* @param opPos The op code position of this location step.
*
* @throws javax.xml.transform.TransformerException
*/
protected void initPredicateInfo(Compiler compiler, int opPos)
throws javax.xml.transform.TransformerException
{
int pos = compiler.getFirstPredicateOpPos(opPos);
if(pos > 0)
{
m_predicates = compiler.getCompiledPredicates(pos);
if(null != m_predicates)
{
for(int i = 0; i < m_predicates.length; i++)
{
m_predicates[i].exprSetParent(this);
}
}
}
}
/**
* Get a predicate expression at the given index.
*
*
* @param index Index of the predicate.
*
* @return A predicate expression.
*/
public Expression getPredicate(int index)
{
return m_predicates[index];
}
/**
* Get the current sub-context position.
*
* @return The node position of this walker in the sub-context node list.
*/
public int getProximityPosition()
{
// System.out.println("getProximityPosition - m_predicateIndex: "+m_predicateIndex);
return getProximityPosition(m_predicateIndex);
}
/**
* Get the current sub-context position.
*
* @param xctxt The XPath runtime context.
*
* @return The node position of this walker in the sub-context node list.
*/
public int getProximityPosition(XPathContext xctxt)
{
return getProximityPosition();
}
/**
* Get the index of the last node that can be itterated to.
*
*
* @param xctxt XPath runtime context.
*
* @return the index of the last node that can be itterated to.
*/
public abstract int getLastPos(XPathContext xctxt);
/**
* Get the current sub-context position.
*
* @param predicateIndex The index of the predicate where the proximity
* should be taken from.
*
* @return The node position of this walker in the sub-context node list.
*/
protected int getProximityPosition(int predicateIndex)
{
return (predicateIndex >= 0) ? m_proximityPositions[predicateIndex] : 0;
}
/**
* Reset the proximity positions counts.
*/
public void resetProximityPositions()
{
int nPredicates = getPredicateCount();
if (nPredicates > 0)
{
if (null == m_proximityPositions)
m_proximityPositions = new int[nPredicates];
for (int i = 0; i < nPredicates; i++)
{
try
{
initProximityPosition(i);
}
catch(Exception e)
{
// TODO: Fix this...
throw new org.apache.xml.utils.WrappedRuntimeException(e);
}
}
}
}
/**
* Init the proximity position to zero for a forward axes.
*
* @param i The index into the m_proximityPositions array.
*
* @throws javax.xml.transform.TransformerException
*/
public void initProximityPosition(int i) throws javax.xml.transform.TransformerException
{
m_proximityPositions[i] = 0;
}
/**
* Count forward one proximity position.
*
* @param i The index into the m_proximityPositions array, where the increment
* will occur.
*/
protected void countProximityPosition(int i)
{
// Note that in the case of a UnionChildIterator, this may be a
// static object and so m_proximityPositions may indeed be null!
int[] pp = m_proximityPositions;
if ((null != pp) && (i < pp.length))
pp[i]++;
}
/**
* Tells if this is a reverse axes.
*
* @return false, unless a derived class overrides.
*/
public boolean isReverseAxes()
{
return false;
}
/**
* Get which predicate is executing.
*
* @return The current predicate index, or -1 if no predicate is executing.
*/
public int getPredicateIndex()
{
return m_predicateIndex;
}
/**
* Process the predicates.
*
* @param context The current context node.
* @param xctxt The XPath runtime context.
*
* @return the result of executing the predicate expressions.
*
* @throws javax.xml.transform.TransformerException
*/
boolean executePredicates(int context, XPathContext xctxt)
throws javax.xml.transform.TransformerException
{
int nPredicates = getPredicateCount();
// System.out.println("nPredicates: "+nPredicates);
if (nPredicates == 0)
return true;
PrefixResolver savedResolver = xctxt.getNamespaceContext();
try
{
m_predicateIndex = 0;
xctxt.pushSubContextList(this);
xctxt.pushNamespaceContext(m_lpi.getPrefixResolver());
xctxt.pushCurrentNode(context);
for (int i = 0; i < nPredicates; i++)
{
// System.out.println("Executing predicate expression - waiting count: "+m_lpi.getWaitingCount());
XObject pred = m_predicates[i].execute(xctxt);
// System.out.println("\nBack from executing predicate expression - waiting count: "+m_lpi.getWaitingCount());
// System.out.println("pred.getType(): "+pred.getType());
if (XObject.CLASS_NUMBER == pred.getType())
{
if (DEBUG_PREDICATECOUNTING)
{
System.out.flush();
System.out.println("\n===== start predicate count ========");
System.out.println("m_predicateIndex: " + m_predicateIndex);
// System.out.println("getProximityPosition(m_predicateIndex): "
// + getProximityPosition(m_predicateIndex));
System.out.println("pred.num(): " + pred.num());
}
int proxPos = this.getProximityPosition(m_predicateIndex);
int predIndex = (int) pred.num();
if (proxPos != predIndex)
{
if (DEBUG_PREDICATECOUNTING)
{
System.out.println("\nnode context: "+nodeToString(context));
System.out.println("index predicate is false: "+proxPos);
System.out.println("\n===== end predicate count ========");
}
return false;
}
else if (DEBUG_PREDICATECOUNTING)
{
System.out.println("\nnode context: "+nodeToString(context));
System.out.println("index predicate is true: "+proxPos);
System.out.println("\n===== end predicate count ========");
}
// If there is a proximity index that will not change during the
// course of itteration, then we know there can be no more true
// occurances of this predicate, so flag that we're done after
// this.
//
// bugzilla 14365
// We can't set m_foundLast = true unless we're sure that -all-
// remaining parameters are stable, or else last() fails. Fixed so
// only sets m_foundLast if on the last predicate
if(m_predicates[i].isStableNumber() && i == nPredicates - 1)
{
m_foundLast = true;
}
}
else if (!pred.bool())
return false;
countProximityPosition(++m_predicateIndex);
}
}
finally
{
xctxt.popCurrentNode();
xctxt.popNamespaceContext();
xctxt.popSubContextList();
m_predicateIndex = -1;
}
return true;
}
/**
* This function is used to fixup variables from QNames to stack frame
* indexes at stylesheet build time.
* @param vars List of QNames that correspond to variables. This list
* should be searched backwards for the first qualified name that
* corresponds to the variable reference qname. The position of the
* QName in the vector from the start of the vector will be its position
* in the stack frame (but variables above the globalsTop value will need
* to be offset to the current stack frame).
*/
public void fixupVariables(java.util.Vector vars, int globalsSize)
{
super.fixupVariables(vars, globalsSize);
int nPredicates = getPredicateCount();
for (int i = 0; i < nPredicates; i++)
{
m_predicates[i].fixupVariables(vars, globalsSize);
}
}
/**
* Diagnostics.
*
* @param n Node to give diagnostic information about, or null.
*
* @return Informative string about the argument.
*/
protected String nodeToString(int n)
{
if(DTM.NULL != n)
{
DTM dtm = m_lpi.getXPathContext().getDTM(n);
return dtm.getNodeName(n) + "{" + (n+1) + "}";
}
else
{
return "null";
}
}
//=============== NodeFilter Implementation ===============
/**
* Test whether a specified node is visible in the logical view of a
* TreeWalker or NodeIterator. This function will be called by the
* implementation of TreeWalker and NodeIterator; it is not intended to
* be called directly from user code.
* @param n The node to check to see if it passes the filter or not.
* @return a constant to determine whether the node is accepted,
* rejected, or skipped, as defined above .
*/
public short acceptNode(int n)
{
XPathContext xctxt = m_lpi.getXPathContext();
try
{
xctxt.pushCurrentNode(n);
XObject score = execute(xctxt, n);
// System.out.println("\n::acceptNode - score: "+score.num()+"::");
if (score != NodeTest.SCORE_NONE)
{
if (getPredicateCount() > 0)
{
countProximityPosition(0);
if (!executePredicates(n, xctxt))
return DTMIterator.FILTER_SKIP;
}
return DTMIterator.FILTER_ACCEPT;
}
}
catch (javax.xml.transform.TransformerException se)
{
// TODO: Fix this.
throw new RuntimeException(se.getMessage());
}
finally
{
xctxt.popCurrentNode();
}
return DTMIterator.FILTER_SKIP;
}
/**
* Get the owning location path iterator.
*
* @return the owning location path iterator, which should not be null.
*/
public LocPathIterator getLocPathIterator()
{
return m_lpi;
}
/**
* Set the location path iterator owner for this walker. Besides
* initialization, this function is called during cloning operations.
*
* @param li non-null reference to the owning location path iterator.
*/
public void setLocPathIterator(LocPathIterator li)
{
m_lpi = li;
if(this != li)
li.exprSetParent(this);
}
/**
* Tell if this expression or it's subexpressions can traverse outside
* the current subtree.
*
* @return true if traversal outside the context node's subtree can occur.
*/
public boolean canTraverseOutsideSubtree()
{
int n = getPredicateCount();
for (int i = 0; i < n; i++)
{
if(getPredicate(i).canTraverseOutsideSubtree())
return true;
}
return false;
}
/**
* This will traverse the heararchy, calling the visitor for
* each member. If the called visitor method returns
* false, the subtree should not be called.
*
* @param visitor The visitor whose appropriate method will be called.
*/
public void callPredicateVisitors(XPathVisitor visitor)
{
if (null != m_predicates)
{
int n = m_predicates.length;
for (int i = 0; i < n; i++)
{
ExpressionOwner predOwner = new PredOwner(i);
if (visitor.visitPredicate(predOwner, m_predicates[i]))
{
m_predicates[i].callVisitors(predOwner, visitor);
}
}
}
}
/**
* @see Expression#deepEquals(Expression)
*/
public boolean deepEquals(Expression expr)
{
if (!super.deepEquals(expr))
return false;
PredicatedNodeTest pnt = (PredicatedNodeTest) expr;
if (null != m_predicates)
{
int n = m_predicates.length;
if ((null == pnt.m_predicates) || (pnt.m_predicates.length != n))
return false;
for (int i = 0; i < n; i++)
{
if (!m_predicates[i].deepEquals(pnt.m_predicates[i]))
return false;
}
}
else if (null != pnt.m_predicates)
return false;
return true;
}
/** This is true if nextNode returns null. */
transient protected boolean m_foundLast = false;
/** The owning location path iterator.
* @serial */
protected LocPathIterator m_lpi;
/**
* Which predicate we are executing.
*/
transient int m_predicateIndex = -1;
/** The list of predicate expressions. Is static and does not need
* to be deep cloned.
* @serial
*/
private Expression[] m_predicates;
/**
* An array of counts that correspond to the number
* of predicates the step contains.
*/
transient protected int[] m_proximityPositions;
/** If true, diagnostic messages about predicate execution will be posted. */
static final boolean DEBUG_PREDICATECOUNTING = false;
class PredOwner implements ExpressionOwner
{
int m_index;
PredOwner(int index)
{
m_index = index;
}
/**
* @see ExpressionOwner#getExpression()
*/
public Expression getExpression()
{
return m_predicates[m_index];
}
/**
* @see ExpressionOwner#setExpression(Expression)
*/
public void setExpression(Expression exp)
{
exp.exprSetParent(PredicatedNodeTest.this);
m_predicates[m_index] = exp;
}
}
}
