org.apache.xpath.objects.XRTreeFragSelectWrapper Maven / Gradle / Ivy
/*
* 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: XRTreeFragSelectWrapper.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.objects;
import org.apache.xalan.res.XSLMessages;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.utils.XMLString;
import org.apache.xpath.Expression;
import org.apache.xpath.XPathContext;
import org.apache.xpath.res.XPATHErrorResources;
/**
* This class makes an select statement act like an result tree fragment.
*/
public class XRTreeFragSelectWrapper extends XRTreeFrag implements Cloneable
{
static final long serialVersionUID = -6526177905590461251L;
public XRTreeFragSelectWrapper(Expression expr)
{
super(expr);
}
/**
* 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)
{
((Expression)m_obj).fixupVariables(vars, globalsSize);
}
/**
* For support of literal objects in xpaths.
*
* @param xctxt The XPath execution context.
*
* @return the result of executing the select expression
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt)
throws javax.xml.transform.TransformerException
{
XObject m_selected;
m_selected = ((Expression)m_obj).execute(xctxt);
m_selected.allowDetachToRelease(m_allowRelease);
if (m_selected.getType() == CLASS_STRING)
return m_selected;
else
return new XString(m_selected.str());
}
/**
* Detaches the DTMIterator from the set which it iterated
* over, releasing any computational resources and placing the iterator
* in the INVALID state. After detach has been invoked,
* calls to nextNode or previousNode will
* raise a runtime exception.
*
* In general, detach should only be called once on the object.
*/
public void detach()
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_DETACH_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"detach() not supported by XRTreeFragSelectWrapper!");
}
/**
* Cast result object to a number.
*
* @return The result tree fragment as a number or NaN
*/
public double num()
throws javax.xml.transform.TransformerException
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NUM_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"num() not supported by XRTreeFragSelectWrapper!");
}
/**
* Cast result object to an XMLString.
*
* @return The document fragment node data or the empty string.
*/
public XMLString xstr()
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_XSTR_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"xstr() not supported by XRTreeFragSelectWrapper!");
}
/**
* Cast result object to a string.
*
* @return The document fragment node data or the empty string.
*/
public String str()
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_STR_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"str() not supported by XRTreeFragSelectWrapper!");
}
/**
* Tell what kind of class this is.
*
* @return the string type
*/
public int getType()
{
return CLASS_STRING;
}
/**
* Cast result object to a result tree fragment.
*
* @return The document fragment this wraps
*/
public int rtf()
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_RTF_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"rtf() not supported by XRTreeFragSelectWrapper!");
}
/**
* Cast result object to a DTMIterator.
*
* @return The document fragment as a DTMIterator
*/
public DTMIterator asNodeIterator()
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_RTF_NOT_SUPPORTED_XRTREEFRAGSELECTWRAPPER, null)); //"asNodeIterator() not supported by XRTreeFragSelectWrapper!");
}
}