Source Code Cross Referenced for MarshalledValue.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » invocation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » server » org.jboss.invocation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.invocation;
023:
024:        import java.io.ByteArrayInputStream;
025:        import java.io.ByteArrayOutputStream;
026:        import java.io.IOException;
027:        import java.io.ObjectInput;
028:        import java.io.ObjectOutput;
029:
030:        import java.util.Arrays;
031:
032:        /**
033:         * A simple replacement for the RMI MarshalledObject that uses the thread
034:         * context class loader for resolving classes and proxies. This currently does
035:         * not support class annotations and dynamic class loading.
036:         *
037:         * @author Scott.Stark@jboss.org
038:         * @version $Revision: 57209 $
039:         */
040:        public class MarshalledValue implements  java.io.Externalizable {
041:            /** Serial Version Identifier. */
042:            private static final long serialVersionUID = -1527598981234110311L;
043:
044:            /**
045:             * The serialized form of the value. If <code>serializedForm</code> is
046:             * <code>null</code> then the object marshalled was a <code>null</code>
047:             * reference.
048:             */
049:            private byte[] serializedForm;
050:
051:            /**
052:             * The RMI MarshalledObject hash of the serializedForm array
053:             */
054:            private int hashCode;
055:
056:            /**
057:             * Exposed for externalization.
058:             */
059:            public MarshalledValue() {
060:                super ();
061:            }
062:
063:            public MarshalledValue(Object obj) throws IOException {
064:                ByteArrayOutputStream baos = new ByteArrayOutputStream();
065:                MarshalledValueOutputStream mvos = new MarshalledValueOutputStream(
066:                        baos);
067:                mvos.writeObject(obj);
068:                mvos.flush();
069:                serializedForm = baos.toByteArray();
070:                mvos.close();
071:                // Use the java.rmi.MarshalledObject hash code calculation
072:                int hash = 0;
073:                for (int i = 0; i < serializedForm.length; i++) {
074:                    hash = 31 * hash + serializedForm[i];
075:                }
076:
077:                hashCode = hash;
078:            }
079:
080:            public Object get() throws IOException, ClassNotFoundException {
081:                if (serializedForm == null)
082:                    return null;
083:
084:                ByteArrayInputStream bais = new ByteArrayInputStream(
085:                        serializedForm);
086:                MarshalledValueInputStream mvis = new MarshalledValueInputStream(
087:                        bais);
088:                Object retValue = mvis.readObject();
089:                mvis.close();
090:                return retValue;
091:            }
092:
093:            public byte[] toByteArray() {
094:                return serializedForm;
095:            }
096:
097:            public int size() {
098:                int size = serializedForm != null ? serializedForm.length : 0;
099:                return size;
100:            }
101:
102:            /**
103:             * Return a hash code for the serialized form of the value.
104:             *
105:             * @return the serialized form value hash.
106:             */
107:            public int hashCode() {
108:                return hashCode;
109:            }
110:
111:            public boolean equals(Object obj) {
112:                if (this  == obj)
113:                    return true;
114:
115:                boolean equals = false;
116:                if (obj instanceof  MarshalledValue) {
117:                    MarshalledValue mv = (MarshalledValue) obj;
118:                    if (serializedForm == mv.serializedForm) {
119:                        equals = true;
120:                    } else {
121:                        equals = Arrays.equals(serializedForm,
122:                                mv.serializedForm);
123:                    }
124:                }
125:                return equals;
126:            }
127:
128:            /**
129:             * The object implements the readExternal method to restore its
130:             * contents by calling the methods of DataInput for primitive
131:             * types and readObject for objects, strings and arrays.  The
132:             * readExternal method must read the values in the same sequence
133:             * and with the same types as were written by writeExternal.
134:             *
135:             * @param in the stream to read data from in order to restore the object
136:             *
137:             * @throws IOException              if I/O errors occur
138:             * @throws ClassNotFoundException   If the class for an object being
139:             *                                  restored cannot be found.
140:             */
141:            public void readExternal(ObjectInput in) throws IOException,
142:                    ClassNotFoundException {
143:                int length = in.readInt();
144:                serializedForm = null;
145:                if (length > 0) {
146:                    serializedForm = new byte[length];
147:                    in.readFully(serializedForm);
148:                }
149:                hashCode = in.readInt();
150:            }
151:
152:            /**
153:             * The object implements the writeExternal method to save its contents
154:             * by calling the methods of DataOutput for its primitive values or
155:             * calling the writeObject method of ObjectOutput for objects, strings,
156:             * and arrays.
157:             *
158:             * @serialData Overriding methods should use this tag to describe
159:             *            the data layout of this Externalizable object.
160:             *            List the sequence of element types and, if possible,
161:             *            relate the element to a public/protected field and/or
162:             *            method of this Externalizable class.
163:             *
164:             * @param out    the stream to write the object to
165:             *
166:             * @throws IOException   Includes any I/O exceptions that may occur
167:             */
168:            public void writeExternal(ObjectOutput out) throws IOException {
169:                int length = serializedForm != null ? serializedForm.length : 0;
170:                out.writeInt(length);
171:                if (length > 0) {
172:                    out.write(serializedForm);
173:                }
174:                out.writeInt(hashCode);
175:            }
176:        }
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