001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.messaging.persistence;
022
023 import java.io.Externalizable;
024 import java.io.IOException;
025 import java.io.ObjectInput;
026 import java.io.ObjectOutput;
027 import java.util.Collection;
028
029 /**
030 * @author Franck WOLFF
031 */
032 public abstract class AbstractExternalizablePersistentCollection implements Externalizable {
033
034 private static final long serialVersionUID = 1L;
035
036 private static final Object[] OBJECT_0 = new Object[0];
037
038 protected boolean initialized;
039 protected String metadata;
040 protected boolean dirty;
041 protected Object[] content;
042
043 public AbstractExternalizablePersistentCollection() {
044 this(OBJECT_0, true, false);
045 }
046
047 public AbstractExternalizablePersistentCollection(Object[] content, boolean initialized, boolean dirty) {
048 this.content = content;
049 this.initialized = initialized;
050 this.dirty = dirty;
051 }
052
053 public boolean isInitialized() {
054 return initialized;
055 }
056 protected void setInitialized(boolean initialized) {
057 this.initialized = initialized;
058 }
059
060 public String getMetadata() {
061 return metadata;
062 }
063
064 public void setMetadata(String metadata) {
065 this.metadata = metadata;
066 }
067
068 public boolean isDirty() {
069 return dirty;
070 }
071 public void setDirty(boolean dirty) {
072 this.dirty = dirty;
073 }
074
075 public Object[] getContent() {
076 return content;
077 }
078 public void setContent(Object[] content) {
079 this.content = content;
080 }
081
082 public void writeExternal(ObjectOutput out) throws IOException {
083 out.writeObject(Boolean.valueOf(initialized));
084 out.writeObject(metadata);
085 if (initialized) {
086 out.writeObject(Boolean.valueOf(dirty));
087 out.writeObject(content);
088 }
089 }
090
091 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
092 initialized = ((Boolean)in.readObject()).booleanValue();
093 metadata = (String)in.readObject();
094 if (initialized) {
095 dirty = ((Boolean)in.readObject()).booleanValue();
096
097 Object o = in.readObject();
098 if (o != null) {
099 if (o instanceof Collection<?>)
100 content = ((Collection<?>)o).toArray();
101 else if (o.getClass().isArray())
102 content = (Object[])o;
103 else
104 content = new Object[]{o}; // should never happened...
105 }
106 }
107 }
108 }