aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.xml.internal.bind.v2.runtime.reflect;
aoqi@0: 
aoqi@0: import com.sun.xml.internal.bind.api.AccessorException;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * {@link Accessor} wrapper that replaces a null with an empty collection.
aoqi@0:  *
aoqi@0:  * <p>
aoqi@0:  * This is so that JAX-WS property accessor will work like an ordinary getter.
aoqi@0:  *
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi
aoqi@0:  */
aoqi@0: public class NullSafeAccessor<B,V,P> extends Accessor<B,V> {
aoqi@0:     private final Accessor<B,V> core;
aoqi@0:     private final Lister<B,V,?,P> lister;
aoqi@0: 
aoqi@0:     public NullSafeAccessor(Accessor<B,V> core, Lister<B,V,?,P> lister) {
aoqi@0:         super(core.getValueType());
aoqi@0:         this.core = core;
aoqi@0:         this.lister = lister;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public V get(B bean) throws AccessorException {
aoqi@0:         V v = core.get(bean);
aoqi@0:         if(v==null) {
aoqi@0:             // creates a new object
aoqi@0:             P pack = lister.startPacking(bean,core);
aoqi@0:             lister.endPacking(pack,bean,core);
aoqi@0:             v = core.get(bean);
aoqi@0:         }
aoqi@0:         return v;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void set(B bean, V value) throws AccessorException {
aoqi@0:         core.set(bean,value);
aoqi@0:     }
aoqi@0: }