/*
* Copyright 2001-2004 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: AttributeSet.java,v 1.18 2005/03/23 17:54:04 ytalwar Exp $
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Enumeration;
import java.util.Vector;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKESPECIAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.xalan.xsltc.compiler.util.AttributeSetMethodGenerator;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.Util;
import org.apache.xml.utils.XML11Char;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
final class AttributeSet extends TopLevelElement {
// 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 AttributeSet _mergeSet;
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
final String name = getAttribute("name");
if (!XML11Char.isXML11ValidQName(name)) {
ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, name, this);
parser.reportError(Constants.ERROR, err);
}
_name = parser.getQNameIgnoreDefaultNs(name);
if ((_name == null) || (_name.equals(EMPTYSTRING))) {
ErrorMsg msg = new ErrorMsg(ErrorMsg.UNNAMED_ATTRIBSET_ERR, this);
parser.reportError(Constants.ERROR, msg);
}
// Get any included attribute sets (similar to inheritance...)
final String useSets = getAttribute("use-attribute-sets");
if (useSets.length() > 0) {
if (!Util.isValidQNames(useSets)) {
ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, useSets, this);
parser.reportError(Constants.ERROR, err);
}
_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 if (child instanceof Text) {
// ignore
}
else {
ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_CHILD_ERR, this);
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);
// _mergeSet Point to any previous definition of this attribute set
_mergeSet = stable.addAttributeSet(this);
_method = AttributeSetPrefix + getXSLTC().nextAttributeSetSerial();
if (_useSets != null) _useSets.typeCheck(stable);
typeCheckContents(stable);
return Type.Void;
}
/**
* 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);
// Generate a reference to previous attribute-set definitions with the
// same name first. Those later in the stylesheet take precedence.
if (_mergeSet != null) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final String methodName = _mergeSet.getMethodName();
il.append(classGen.loadTranslet());
il.append(methodGen.loadDOM());
il.append(methodGen.loadIterator());
il.append(methodGen.loadHandler());
final int method = cpg.addMethodref(classGen.getClassName(),
methodName, ATTR_SET_SIG);
il.append(new INVOKESPECIAL(method));
}
// 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()) {
SyntaxTreeNode element = (SyntaxTreeNode)attributes.nextElement();
if (element instanceof XslAttribute) {
final XslAttribute attribute = (XslAttribute)element;
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());
}
public String toString() {
StringBuffer buf = new StringBuffer("attribute-set: ");
// Translate all local attributes
final Enumeration attributes = elements();
while (attributes.hasMoreElements()) {
final XslAttribute attribute =
(XslAttribute)attributes.nextElement();
buf.append(attribute);
}
return(buf.toString());
}
}