/*
* @(#)$Id$
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Vector;
import java.util.Enumeration;
import java.util.StringTokenizer;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.apache.xalan.xsltc.compiler.util.Type;
import de.fub.bytecode.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;
final class AttributeSet extends TopLevelElement {
// Error messages
private static final String NO_NAME_ERROR =
"Attribute set missing 'name' attribute.";
private static final String BASTARD_ERROR =
"Attribute sets can only have <xsl:attribute> child elements.";
// This prefix is used for the method name of attribute set methods
private static final String AttributeSetPrefix = "%as";
// Element contents
private QName _name;
private UseAttributeSets _useSets;
private String _method;
private boolean _ignore = false;
/**
* Returns the QName of this attribute set
*/
public QName getName() {
return _name;
}
/**
* Returns the method name of this attribute set. This method name is
* generated by the compiler (XSLTC)
*/
public String getMethodName() {
return _method;
}
/**
* Call this method to prevent a method for being compiled for this set.
* This is used in case several <xsl:attribute-set...> elements constitute
* a single set (with one name). The last element will merge itself with
* any previous set(s) with the same name and disable the other set(s).
*/
public void ignore() {
_ignore = true;
}
/**
* Parse the contents of this attribute set. Recognised attributes are
* "name" (required) and "use-attribute-sets" (optional).
*/
public void parseContents(Parser parser) {
// Get this attribute set's name
_name = parser.getQName(getAttribute("name"));
if ((_name == null) || (_name.equals(Constants.EMPTYSTRING))) {
final ErrorMsg msg = new ErrorMsg(NO_NAME_ERROR, getLineNumber());
parser.reportError(Constants.ERROR, msg);
}
// Get any included attribute sets (similar to inheritance...)
final String useSets = getAttribute("use-attribute-sets");
if (useSets.length() > 0) {
_useSets = new UseAttributeSets(useSets, parser);
}
// Parse the contents of this node. All child elements must be
// <xsl:attribute> elements. Other elements cause an error.
final Vector contents = getContents();
final int count = contents.size();
for (int i=0; i<count; i++) {
SyntaxTreeNode child = (SyntaxTreeNode)contents.elementAt(i);
if (child instanceof XslAttribute) {
parser.getSymbolTable().setCurrentNode(child);
child.parseContents(parser);
}
else {
final ErrorMsg msg =
new ErrorMsg(BASTARD_ERROR, getLineNumber());
parser.reportError(Constants.ERROR, msg);
}
}
// Point the symbol table back at us...
parser.getSymbolTable().setCurrentNode(this);
}
/**
* Type check the contents of this element
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_ignore) return (Type.Void);
final AttributeSet other = stable.addAttributeSet(this);
if (other != null) {
_method = other.getMethodName();
merge(other);
other.ignore();
}
else {
_method = AttributeSetPrefix + getXSLTC().nextAttributeSetSerial();
}
if (_useSets != null) _useSets.typeCheck(stable);
typeCheckContents(stable);
return Type.Void;
}
/**
* Merge this attribute set with some other one
*/
private void merge(AttributeSet other) {
// Both attribute sets may inherit from other sets...
if (_useSets == null)
_useSets = other._useSets;
else
_useSets.addAttributeSets(other.getAttribute("use-attribute-sets"));
// Merge the contents of the two attribute sets...
final Enumeration attributes = other.elements();
while (attributes.hasMoreElements())
setFirstElement((XslAttribute)attributes.nextElement());
}
/**
* Compile a method that outputs the attributes in this set
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
if (_ignore) return;
// Create a new method generator for an attribute set method
methodGen = new AttributeSetMethodGenerator(_method, classGen);
// Translate other used attribute sets first, as local attributes
// take precedence (last attributes overrides first)
if (_useSets != null) _useSets.translate(classGen, methodGen);
// Translate all local attributes
final Enumeration attributes = elements();
while (attributes.hasMoreElements()) {
final XslAttribute attribute =
(XslAttribute)attributes.nextElement();
attribute.translate(classGen, methodGen);
}
final InstructionList il = methodGen.getInstructionList();
il.append(RETURN);
methodGen.stripAttributes(true);
methodGen.setMaxLocals();
methodGen.setMaxStack();
methodGen.removeNOPs();
classGen.addMethod(methodGen.getMethod());
}
}