1 /* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.tools.internal.xjc.generator.util; 27 28 import com.sun.codemodel.internal.JBlock; 29 30 /** 31 * Lazy block reference. 32 * 33 * @author 34 * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com) 35 */ 36 public abstract class LazyBlockReference implements BlockReference { 37 38 private JBlock block = null; 39 40 /** 41 * Called when a block needs to be created. 42 * Only called once in the whole life time of this object. 43 */ 44 protected abstract JBlock create(); 45 46 public JBlock get(boolean create) { 47 if(!create) return block; 48 if(block==null) 49 block = create(); 50 return block; 51 } 52 53 }