src/share/jaxws_classes/com/sun/tools/internal/xjc/generator/util/LazyBlockReference.java

/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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.
 *
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package com.sun.tools.internal.xjc.generator.util;

import com.sun.codemodel.internal.JBlock;

/**
 * Lazy block reference.
 *
 * @author
 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public abstract class LazyBlockReference implements BlockReference {

    private JBlock block = null;

    /**
     * Called when a block needs to be created.
     * Only called once in the whole life time of this object.
     */
    protected abstract JBlock create();

    public JBlock get(boolean create) {
        if(!create)     return block;
        if(block==null)
            block = create();
        return block;
    }

}