/*
* 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: ElemValueOf.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import javax.xml.transform.TransformerException;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xml.dtm.DTM;
import org.apache.xml.serializer.SerializationHandler;
import org.apache.xpath.Expression;
import org.apache.xpath.XPath;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XObject;
import org.xml.sax.SAXException;
/**
* Implement xsl:value-of.
* <pre>
* <!ELEMENT xsl:value-of EMPTY>
* <!ATTLIST xsl:value-of
* select %expr; #REQUIRED
* disable-output-escaping (yes|no) "no"
* >
* </pre>
* @see <a href="http://www.w3.org/TR/xslt#value-of">value-of in XSLT Specification</a>
* @xsl.usage advanced
*/
public class ElemValueOf extends ElemTemplateElement
{
static final long serialVersionUID = 3490728458007586786L;
/**
* The select expression to be executed.
* @serial
*/
private XPath m_selectExpression = null;
/**
* True if the pattern is a simple ".".
* @serial
*/
private boolean m_isDot = false;
/**
* Set the "select" attribute.
* The required select attribute is an expression; this expression
* is evaluated and the resulting object is converted to a
* string as if by a call to the string function.
*
* @param v The value to set for the "select" attribute.
*/
public void setSelect(XPath v)
{
if (null != v)
{
String s = v.getPatternString();
m_isDot = (null != s) && s.equals(".");
}
m_selectExpression = v;
}
/**
* Get the "select" attribute.
* The required select attribute is an expression; this expression
* is evaluated and the resulting object is converted to a
* string as if by a call to the string function.
*
* @return The value of the "select" attribute.
*/
public XPath getSelect()
{
return m_selectExpression;
}
/**
* Tells if this element should disable escaping.
* @serial
*/
private boolean m_disableOutputEscaping = false;
/**
* Set the "disable-output-escaping" attribute.
* Normally, the xml output method escapes & and < (and
* possibly other characters) when outputting text nodes.
* This ensures that the output is well-formed XML. However,
* it is sometimes convenient to be able to produce output
* that is almost, but not quite well-formed XML; for
* example, the output may include ill-formed sections
* which are intended to be transformed into well-formed
* XML by a subsequent non-XML aware process. For this reason,
* XSLT provides a mechanism for disabling output escaping.
* An xsl:value-of or xsl:text element may have a
* disable-output-escaping attribute; the allowed values
* are yes or no; the default is no; if the value is yes,
* then a text node generated by instantiating the xsl:value-of
* or xsl:text element should be output without any escaping.
* @see <a href="http://www.w3.org/TR/xslt#disable-output-escaping">disable-output-escaping in XSLT Specification</a>
*
* @param v The value to set for the "disable-output-escaping" attribute.
*/
public void setDisableOutputEscaping(boolean v)
{
m_disableOutputEscaping = v;
}
/**
* Get the "disable-output-escaping" attribute.
* Normally, the xml output method escapes & and < (and
* possibly other characters) when outputting text nodes.
* This ensures that the output is well-formed XML. However,
* it is sometimes convenient to be able to produce output
* that is almost, but not quite well-formed XML; for
* example, the output may include ill-formed sections
* which are intended to be transformed into well-formed
* XML by a subsequent non-XML aware process. For this reason,
* XSLT provides a mechanism for disabling output escaping.
* An xsl:value-of or xsl:text element may have a
* disable-output-escaping attribute; the allowed values
* are yes or no; the default is no; if the value is yes,
* then a text node generated by instantiating the xsl:value-of
* or xsl:text element should be output without any escaping.
* @see <a href="http://www.w3.org/TR/xslt#disable-output-escaping">disable-output-escaping in XSLT Specification</a>
*
* @return The value of the "disable-output-escaping" attribute.
*/
public boolean getDisableOutputEscaping()
{
return m_disableOutputEscaping;
}
/**
* Get an integer representation of the element type.
*
* @return An integer representation of the element, defined in the
* Constants class.
* @see org.apache.xalan.templates.Constants
*/
public int getXSLToken()
{
return Constants.ELEMNAME_VALUEOF;
}
/**
* This function is called after everything else has been
* recomposed, and allows the template to set remaining
* values that may be based on some other property that
* depends on recomposition.
*
* NEEDSDOC @param sroot
*
* @throws TransformerException
*/
public void compose(StylesheetRoot sroot) throws TransformerException
{
super.compose(sroot);
java.util.Vector vnames = sroot.getComposeState().getVariableNames();
if (null != m_selectExpression)
m_selectExpression.fixupVariables(
vnames, sroot.getComposeState().getGlobalsSize());
}
/**
* Return the node name.
*
* @return The node name
*/
public String getNodeName()
{
return Constants.ELEMNAME_VALUEOF_STRING;
}
/**
* Execute the string expression and copy the text to the
* result tree.
* The required select attribute is an expression; this expression
* is evaluated and the resulting object is converted to a string
* as if by a call to the string function. The string specifies
* the string-value of the created text node. If the string is
* empty, no text node will be created. The created text node will
* be merged with any adjacent text nodes.
* @see <a href="http://www.w3.org/TR/xslt#value-of">value-of in XSLT Specification</a>
*
* @param transformer non-null reference to the the current transform-time state.
*
* @throws TransformerException
*/
public void execute(TransformerImpl transformer) throws TransformerException
{
XPathContext xctxt = transformer.getXPathContext();
SerializationHandler rth = transformer.getResultTreeHandler();
try
{
// Optimize for "."
xctxt.pushNamespaceContext(this);
int current = xctxt.getCurrentNode();
xctxt.pushCurrentNodeAndExpression(current, current);
if (m_disableOutputEscaping)
rth.processingInstruction(
javax.xml.transform.Result.PI_DISABLE_OUTPUT_ESCAPING, "");
try
{
Expression expr = m_selectExpression.getExpression();
expr.executeCharsToContentHandler(xctxt, rth);
}
finally
{
if (m_disableOutputEscaping)
rth.processingInstruction(
javax.xml.transform.Result.PI_ENABLE_OUTPUT_ESCAPING, "");
xctxt.popNamespaceContext();
xctxt.popCurrentNodeAndExpression();
}
}
catch (SAXException se)
{
throw new TransformerException(se);
}
catch (RuntimeException re) {
TransformerException te = new TransformerException(re);
te.setLocator(this);
throw te;
}
}
/**
* Add a child to the child list.
*
* @param newChild Child to add to children list
*
* @return Child just added to children list
*
* @throws DOMException
*/
public ElemTemplateElement appendChild(ElemTemplateElement newChild)
{
error(XSLTErrorResources.ER_CANNOT_ADD,
new Object[]{ newChild.getNodeName(),
this.getNodeName() }); //"Can not add " +((ElemTemplateElement)newChild).m_elemName +
//" to " + this.m_elemName);
return null;
}
/**
* Call the children visitors.
* @param visitor The visitor whose appropriate method will be called.
*/
protected void callChildVisitors(XSLTVisitor visitor, boolean callAttrs)
{
if(callAttrs)
m_selectExpression.getExpression().callVisitors(m_selectExpression, visitor);
super.callChildVisitors(visitor, callAttrs);
}
}