/*
 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.sun.tools.internal.xjc.model;

import com.sun.codemodel.internal.JExpression;
import com.sun.tools.internal.xjc.outline.Outline;
import com.sun.xml.internal.xsom.XmlString;

/**
 * Object that computes the default value expression lazily.
 *
 * The computation is done lazily because often the default value
 * needs to refer to things (such as enum classes) that are only generated
 * after some of the outline is built.
 *
 * @author Kohsuke Kawaguchi
 */
public abstract class CDefaultValue {
    public abstract JExpression compute(Outline outline);

    /**
     * Creates a new {@link CDefaultValue} that computes the default value
     * by applying a lexical representation to a {@link TypeUse}.
     */
    public static CDefaultValue create(final TypeUse typeUse, final XmlString defaultValue) {
        return new CDefaultValue() {
            public JExpression compute(Outline outline) {
                return typeUse.createConstant(outline,defaultValue);
            }
        };
    }
}