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/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: FilterExprIterator.java,v 1.2.4.2 2005/09/14 19:45:22 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.axes;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xpath.internal.Expression;
import com.sun.org.apache.xpath.internal.ExpressionOwner;
import com.sun.org.apache.xpath.internal.XPathVisitor;
import com.sun.org.apache.xpath.internal.objects.XNodeSet;
public class FilterExprIterator extends BasicTestIterator
{
static final long serialVersionUID = 2552176105165737614L;
/** The contained expression. Should be non-null.
* @serial */
private Expression m_expr;
/** The result of executing m_expr. Needs to be deep cloned on clone op. */
transient private XNodeSet m_exprObj;
private boolean m_mustHardReset = false;
private boolean m_canDetachNodeset = true;
/**
* Create a FilterExprIterator object.
*
*/
public FilterExprIterator()
{
super(null);
}
/**
* Create a FilterExprIterator object.
*
*/
public FilterExprIterator(Expression expr)
{
super(null);
m_expr = expr;
}
/**
* Initialize the context values for this expression
* after it is cloned.
*
* @param context The XPath runtime context for this
* transformation.
*/
public void setRoot(int context, Object environment)
{
super.setRoot(context, environment);
m_exprObj = FilterExprIteratorSimple.executeFilterExpr(context,
m_execContext, getPrefixResolver(),
getIsTopLevel(), m_stackFrame, m_expr);
}
/**
* Get the next node via getNextXXX. Bottlenecked for derived class override.
* @return The next node on the axis, or DTM.NULL.
*/
protected int getNextNode()
{
if (null != m_exprObj)
{
m_lastFetched = m_exprObj.nextNode();
}
else
m_lastFetched = DTM.NULL;
return m_lastFetched;
}
/**
* Detaches the walker from the set which it iterated over, releasing
* any computational resources and placing the iterator in the INVALID
* state.
*/
public void detach()
{
super.detach();
m_exprObj.detach();
m_exprObj = null;
}
/**
* 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);
m_expr.fixupVariables(vars, globalsSize);
}
/**
* Get the inner contained expression of this filter.
*/
public Expression getInnerExpression()
{
return m_expr;
}
/**
* Set the inner contained expression of this filter.
*/
public void setInnerExpression(Expression expr)
{
expr.exprSetParent(this);
m_expr = expr;
}
/**
* Get the analysis bits for this walker, as defined in the WalkerFactory.
* @return One of WalkerFactory#BIT_DESCENDANT, etc.
*/
public int getAnalysisBits()
{
if (null != m_expr && m_expr instanceof PathComponent)
{
return ((PathComponent) m_expr).getAnalysisBits();
}
return WalkerFactory.BIT_FILTER;
}
/**
* Returns true if all the nodes in the iteration well be returned in document
* order.
* Warning: This can only be called after setRoot has been called!
*
* @return true as a default.
*/
public boolean isDocOrdered()
{
return m_exprObj.isDocOrdered();
}
class filterExprOwner implements ExpressionOwner
{
/**
* @see ExpressionOwner#getExpression()
*/
public Expression getExpression()
{
return m_expr;
}
/**
* @see ExpressionOwner#setExpression(Expression)
*/
public void setExpression(Expression exp)
{
exp.exprSetParent(FilterExprIterator.this);
m_expr = exp;
}
}
/**
* 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)
{
m_expr.callVisitors(new filterExprOwner(), visitor);
super.callPredicateVisitors(visitor);
}
/**
* @see Expression#deepEquals(Expression)
*/
public boolean deepEquals(Expression expr)
{
if (!super.deepEquals(expr))
return false;
FilterExprIterator fet = (FilterExprIterator) expr;
if (!m_expr.deepEquals(fet.m_expr))
return false;
return true;
}
}
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