/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * 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.

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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.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.MethodGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 */

final class LiteralExpr extends Expression {

    private final String _value;

    private final String _namespace;

    /**

     * Creates a new literal expression node.

     * @param value the literal expression content/value.

     */

    public LiteralExpr(String value) {

        _value = value;

        _namespace = null;

    }

    /**

     * Creates a new literal expression node.

     * @param value the literal expression content/value.

     * @param namespace the namespace in which the expression exists.

     */

    public LiteralExpr(String value, String namespace) {

        _value = value;

        _namespace = namespace.equals(Constants.EMPTYSTRING) ? null : namespace;

    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

        return _type = Type.String;

    }

    public String toString() {

        return "literal-expr(" + _value + ')';

    }

    protected boolean contextDependent() {

        return false;

    }

    protected String getValue() {

        return _value;

    }

    protected String getNamespace() {

        return _namespace;

    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

        final ConstantPoolGen cpg = classGen.getConstantPool();

        final InstructionList il = methodGen.getInstructionList();

        il.append(new PUSH(cpg, _value));

    }

}