/*
 * 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: LiteralExpr.java,v 1.8 2004/02/16 22:24:29 minchau 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.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));
    }
}