/*

 */

/*

 * 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: 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 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;

import java.util.List;

/**

 * @author Morten Jorgensen

 */

final class UnsupportedElement extends SyntaxTreeNode {

    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) {

        List<SyntaxTreeNode> children = getContents();

        if (children != null) {

            final int count = children.size();

            for (int i = 0; i < count; i++) {

                SyntaxTreeNode child = children.get(i);

                if (child instanceof Fallback) {

                    Fallback fallback = (Fallback)child;

                    fallback.activate();

                    fallback.parseContents(parser);

                    if (_fallbacks == null) {

                    }

                }

            }

        }

    }

    /**

     * 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.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.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));

        }

    }

}