001: /*--
002:
003: Copyright (C) 2002-2005 Adrian Price.
004: All rights reserved.
005:
006: Redistribution and use in source and binary forms, with or without
007: modification, are permitted provided that the following conditions
008: are met:
009:
010: 1. Redistributions of source code must retain the above copyright
011: notice, this list of conditions, and the following disclaimer.
012:
013: 2. Redistributions in binary form must reproduce the above copyright
014: notice, this list of conditions, and the disclaimer that follows
015: these conditions in the documentation and/or other materials
016: provided with the distribution.
017:
018: 3. The names "OBE" and "Open Business Engine" must not be used to
019: endorse or promote products derived from this software without prior
020: written permission. For written permission, please contact
021: adrianprice@sourceforge.net.
022:
023: 4. Products derived from this software may not be called "OBE" or
024: "Open Business Engine", nor may "OBE" or "Open Business Engine"
025: appear in their name, without prior written permission from
026: Adrian Price (adrianprice@users.sourceforge.net).
027:
028: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
029: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
030: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
031: DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
032: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
033: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
034: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
035: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
036: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
037: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
038: POSSIBILITY OF SUCH DAMAGE.
039:
040: For more information on OBE, please see
041: <http://obe.sourceforge.net/>.
042:
043: */
044:
045: package org.obe.server.util;
046:
047: import java.io.*;
048:
049: /**
050: * @author Adrian Price
051: */
052: public class ObjectUtil {
053: public static byte[] serializeToByteArray(Serializable obj)
054: throws IOException {
055:
056: ByteArrayOutputStream bos = null;
057: ObjectOutputStream oos = null;
058: try {
059: bos = new ByteArrayOutputStream();
060: oos = new ObjectOutputStream(bos);
061: oos.writeObject(obj);
062: return bos.toByteArray();
063: } finally {
064: if (oos != null) {
065: try {
066: oos.close();
067: } catch (IOException e) {
068: // Ignore, because we did write the stream successfully.
069: }
070: }
071: if (bos != null) {
072: try {
073: bos.close();
074: } catch (IOException e) {
075: // Ignore, because we did write the stream successfully.
076: }
077: }
078: }
079: }
080:
081: public static Serializable deserializeFromByteArray(byte[] ba)
082: throws IOException, ClassNotFoundException {
083:
084: ByteArrayInputStream bis = null;
085: ObjectInputStream ois = null;
086: try {
087: bis = new ByteArrayInputStream(ba);
088: ois = new ObjectInputStream(bis);
089: return (Serializable) ois.readObject();
090: } finally {
091: if (ois != null) {
092: try {
093: ois.close();
094: } catch (IOException e) {
095: // Ignore, because we did read the stream successfully.
096: }
097: }
098: if (bis != null) {
099: try {
100: bis.close();
101: } catch (IOException e) {
102: // Ignore, because we did read the stream successfully.
103: }
104: }
105: }
106: }
107:
108: public static InputStream serializeToInputStream(Serializable obj)
109: throws IOException {
110:
111: return new ByteArrayInputStream(serializeToByteArray(obj));
112: }
113:
114: public static Serializable deserializeFromInputStream(InputStream in)
115: throws ClassNotFoundException, IOException {
116:
117: ObjectInputStream ois = null;
118: try {
119: ois = new ObjectInputStream(in);
120: return (Serializable) ois.readObject();
121: } finally {
122: if (ois != null) {
123: try {
124: ois.close();
125: } catch (IOException e) {
126: // Ignore, because we did read the stream successfully.
127: }
128: }
129: }
130: }
131:
132: /**
133: * Computes the hashcode of an array by XORing the hashcodes of all its
134: * elements.
135: *
136: * @param array Input array.
137: * @return The array's hashcode.
138: */
139: public static int hashcode(Object[] array) {
140: if (array == null)
141: throw new IllegalArgumentException("array cannot be null");
142: return hashcode(array, array.length);
143: }
144:
145: /**
146: * Computes the hashcode of an array by XORing the hashcodes of a subset of
147: * its elements.
148: *
149: * @param array Input array.
150: * @param count The number of elements of <code>array</code> to include in
151: * the computation.
152: * @return The array's hashcode.
153: */
154: public static int hashcode(Object[] array, int count) {
155: if (array == null)
156: throw new IllegalArgumentException("array cannot be null");
157: if (count > array.length) {
158: throw new IllegalArgumentException(
159: "count cannot exceed array.length");
160: }
161:
162: int hashcode = 0;
163: if (array != null) {
164: for (int i = 0; i < count; i++) {
165: Object o = array[i];
166: if (o != null)
167: hashcode ^= o.hashCode();
168: }
169: }
170: return hashcode;
171: }
172:
173: private ObjectUtil() {
174: }
175: }
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