/*
* 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: UnaryOperation.java,v 1.2.4.1 2005/09/14 21:31:44 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.operations;
import com.sun.org.apache.xpath.internal.Expression;
import com.sun.org.apache.xpath.internal.ExpressionOwner;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.XPathVisitor;
import com.sun.org.apache.xpath.internal.objects.XObject;
/**
* The unary operation base class.
*/
public abstract class UnaryOperation extends Expression implements ExpressionOwner
{
static final long serialVersionUID = 6536083808424286166L;
/** The operand for the operation.
* @serial */
protected Expression m_right;
/**
* 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)
{
m_right.fixupVariables(vars, globalsSize);
}
/**
* 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()
{
if (null != m_right && m_right.canTraverseOutsideSubtree())
return true;
return false;
}
/**
* Set the expression operand for the operation.
*
*
* @param r The expression operand to which the unary operation will be
* applied.
*/
public void setRight(Expression r)
{
m_right = r;
r.exprSetParent(this);
}
/**
* Execute the operand and apply the unary operation to the result.
*
*
* @param xctxt The runtime execution context.
*
* @return An XObject that represents the result of applying the unary
* operation to the evaluated operand.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
return operate(m_right.execute(xctxt));
}
/**
* Apply the operation to two operands, and return the result.
*
*
* @param right non-null reference to the evaluated right operand.
*
* @return non-null reference to the XObject that represents the result of the operation.
*
* @throws javax.xml.transform.TransformerException
*/
public abstract XObject operate(XObject right)
throws javax.xml.transform.TransformerException;
/** @return the operand of unary operation, as an Expression.
*/
public Expression getOperand(){
return m_right;
}
/**
* @see com.sun.org.apache.xpath.internal.XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)
*/
public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
{
if(visitor.visitUnaryOperation(owner, this))
{
m_right.callVisitors(this, visitor);
}
}
/**
* @see ExpressionOwner#getExpression()
*/
public Expression getExpression()
{
return m_right;
}
/**
* @see ExpressionOwner#setExpression(Expression)
*/
public void setExpression(Expression exp)
{
exp.exprSetParent(this);
m_right = exp;
}
/**
* @see Expression#deepEquals(Expression)
*/
public boolean deepEquals(Expression expr)
{
if(!isSameClass(expr))
return false;
if(!m_right.deepEquals(((UnaryOperation)expr).m_right))
return false;
return true;
}
}