/*
* 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: UnsupportedElement.java,v 1.2.4.1 2005/09/05 09:26:51 pvedula Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import java.util.Vector;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.PUSH;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
/**
* @author Morten Jorgensen
*/
final class UnsupportedElement extends SyntaxTreeNode {
private Vector _fallbacks = null;
private ErrorMsg _message = null;
private boolean _isExtension = false;
/**
* Basic consutrcor - stores element uri/prefix/localname
*/
public UnsupportedElement(String uri, String prefix, String local, boolean isExtension) {
super(uri, prefix, local);
_isExtension = isExtension;
}
/**
* There are different categories of unsupported elements (believe it
* or not): there are elements within the XSLT namespace (these would
* be elements that are not yet implemented), there are extensions of
* other XSLT processors and there are unrecognised extension elements
* of this XSLT processor. The error message passed to this method
* should describe the unsupported element itself and what category
* the element belongs in.
*/
public void setErrorMessage(ErrorMsg message) {
_message = message;
}
/**
* Displays the contents of this element
*/
public void display(int indent) {
indent(indent);
Util.println("Unsupported element = " + _qname.getNamespace() +
":" + _qname.getLocalPart());
displayContents(indent + IndentIncrement);
}
/**
* Scan and process all fallback children of the unsupported element.
*/
private void processFallbacks(Parser parser) {
Vector children = getContents();
if (children != null) {
final int count = children.size();
for (int i = 0; i < count; i++) {
SyntaxTreeNode child = (SyntaxTreeNode)children.elementAt(i);
if (child instanceof Fallback) {
Fallback fallback = (Fallback)child;
fallback.activate();
fallback.parseContents(parser);
if (_fallbacks == null) {
_fallbacks = new Vector();
}
_fallbacks.addElement(child);
}
}
}
}
/**
* Find any fallback in the descendant nodes; then activate & parse it
*/
public void parseContents(Parser parser) {
processFallbacks(parser);
}
/**
* Run type check on the fallback element (if any).
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_fallbacks != null) {
int count = _fallbacks.size();
for (int i = 0; i < count; i++) {
Fallback fallback = (Fallback)_fallbacks.elementAt(i);
fallback.typeCheck(stable);
}
}
return Type.Void;
}
/**
* Translate the fallback element (if any).
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
if (_fallbacks != null) {
int count = _fallbacks.size();
for (int i = 0; i < count; i++) {
Fallback fallback = (Fallback)_fallbacks.elementAt(i);
fallback.translate(classGen, methodGen);
}
}
// We only go into the else block in forward-compatibility mode, when
// the unsupported element has no fallback.
else {
// If the unsupported element does not have any fallback child, then
// at runtime, a runtime error should be raised when the unsupported
// element is instantiated. Otherwise, no error is thrown.
ConstantPoolGen cpg = classGen.getConstantPool();
InstructionList il = methodGen.getInstructionList();
final int unsupportedElem = cpg.addMethodref(BASIS_LIBRARY_CLASS, "unsupported_ElementF",
"(" + STRING_SIG + "Z)V");
il.append(new PUSH(cpg, getQName().toString()));
il.append(new PUSH(cpg, _isExtension));
il.append(new INVOKESTATIC(unsupportedElem));
}
}
}