src/org/apache/xalan/xsltc/compiler/LiteralExpr.java

/*
 * @(#)$Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Sun
 * Microsystems., http://www.sun.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 *
 */

package org.apache.xalan.xsltc.compiler;

import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.bcel.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;

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));
    }
}