/*
* 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: AVTPart.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import org.apache.xml.utils.FastStringBuffer;
import org.apache.xpath.XPathContext;
/**
* Class to hold a part, either a string or XPath,
* of an Attribute Value Template.
* @xsl.usage internal
*/
public abstract class AVTPart implements java.io.Serializable, XSLTVisitable
{
static final long serialVersionUID = -1747749903613916025L;
/**
* Construct a part.
*/
public AVTPart(){}
/**
* Get the AVT part as the original string.
*
* @return the AVT part as the original string.
*/
public abstract String getSimpleString();
/**
* Write the evaluated value into the given
* string buffer.
*
* @param xctxt The XPath context to use to evaluate this AVT.
* @param buf Buffer to write into.
* @param context The current source tree context.
* @param nsNode The current namespace context (stylesheet tree context).
*
* @throws javax.xml.transform.TransformerException
*/
public abstract void evaluate(
XPathContext xctxt, FastStringBuffer buf, int context,
org.apache.xml.utils.PrefixResolver nsNode)
throws javax.xml.transform.TransformerException;
/**
* Set the XPath support.
*
* @param support XPathContext to set.
*/
public void setXPathSupport(XPathContext support){}
/**
* 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()
{
return false;
}
/**
* 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 abstract void fixupVariables(java.util.Vector vars, int globalsSize);
}