Package com.sun.org.apache.xalan.internal.xsltc.compiler

Source Code of com.sun.org.apache.xalan.internal.xsltc.compiler.Fallback

/*
* Copyright (c) 2007-2012, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/*
* 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: Fallback.java,v 1.2.4.1 2005/09/01 14:22:25 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.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
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;

/**
* @author Morten Jorgensen
*/
final class Fallback extends Instruction {

    private boolean _active = false;

    /**
     * This element never produces any data on the stack
     */
    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        if (_active) {
            return(typeCheckContents(stable));
        }
        else {
            return Type.Void;
        }
    }

    /**
     * Activate this fallback element
     */
    public void activate() {
        _active = true;
    }

    public String toString() {
        return("fallback");
    }

    /**
     * Parse contents only if this fallback element is put in place of
     * some unsupported element or non-XSLTC extension element
     */
    public void parseContents(Parser parser) {
        if (_active) parseChildren(parser);
    }

    /**
     * Translate contents only if this fallback element is put in place of
     * some unsupported element or non-XSLTC extension element
     */
    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();

        if (_active) translateContents(classGen, methodGen);
    }
}
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