/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xindice" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999-2001, The dbXML
* Group, L.L.C., http://www.dbxmlgroup.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package net.jxta.impl.xindice.core.data;
/**
* Key extends Value by providing a hash value for the Key.
*/
public final class Key extends Value {
private int hash = 0;
public Key(Value value) {
super(value);
}
public Key(byte[] data) {
super(data);
}
public Key(byte[] data, int pos, int len) {
super(data, pos, len);
}
public Key(String data) {
super(data);
}
// TODO: This has to be revisited
private void calculateHash() {
hash = 0;
int pl = pos + len;
for (int i = pos; i < pl; i++) {
hash = (hash << 5) ^ data[i];
hash = hash % 1234567891;
}
hash = Math.abs(hash);
}
public int getHash() {
if (hash == 0) {
calculateHash();
}
return hash;
}
@Override
public boolean equals(Value value) {
if (value instanceof Key) {
Key key = (Key) value;
return getHash() == key.getHash() && compareTo(key) == 0;
} else {
return super.equals(value);
}
}
@Override
public int hashCode() {
return getHash();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Key) {
return equals((Key) obj);
} else {
return super.equals(obj);
}
}
}