/*
* Mojito Distributed Hash Table (Mojito DHT)
* Copyright (C) 2006-2007 LimeWire LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.limewire.mojito.db.impl;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import org.limewire.mojito.db.DHTValue;
import org.limewire.mojito.db.DHTValueType;
import org.limewire.mojito.routing.Version;
import org.limewire.mojito.util.ArrayUtils;
/**
* A <code>DHTValue</code> is a {@link DHTValueType}, {@link Version} and value triple.
*/
public class DHTValueImpl implements DHTValue {
private static final long serialVersionUID = -7381830963268622187L;
/**
* An empty byte array
*/
private static final byte[] EMPTY = new byte[0];
/**
* The type of the value
*/
private final DHTValueType valueType;
/**
* The version of the value
*/
private final Version version;
/**
* The actual value
*/
private final byte[] value;
/**
* The hash code of this value
*/
private final int hashCode;
public DHTValueImpl(DHTValueType valueType,
Version version, byte[] value) {
this.valueType = valueType;
this.version = version;
if (value == null || value.length == 0) {
value = EMPTY;
}
this.value = value;
this.hashCode = Arrays.hashCode(value);
}
/* (non-Javadoc)
* @see org.limewire.mojito.db.DHTValue#getValueType()
*/
public DHTValueType getValueType() {
return valueType;
}
/* (non-Javadoc)
* @see org.limewire.mojito.db.DHTValue#getVersion()
*/
public Version getVersion() {
return version;
}
/* (non-Javadoc)
* @see org.limewire.mojito.db.DHTValue#writeValue(java.io.OutputStream)
*/
public void write(OutputStream out) throws IOException {
out.write(value, 0, value.length);
}
/* (non-Javadoc)
* @see org.limewire.mojito.db.DHTValue#getValue()
*/
public byte[] getValue() {
byte[] copy = new byte[value.length];
System.arraycopy(value, 0, copy, 0, value.length);
return copy;
}
/*
* (non-Javadoc)
* @see org.limewire.mojito.db.DHTValue#size()
*/
public int size() {
return value.length;
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
} else if (!(o instanceof DHTValue)) {
return false;
}
DHTValue other = (DHTValue)o;
return valueType.equals(other.getValueType())
&& version.equals(other.getVersion())
&& Arrays.equals(value, other.getValue());
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("DHTValueType: ").append(getValueType()).append("\n");
buffer.append("Version: ").append(getVersion()).append("\n");
buffer.append("Value: ");
if (size() == 0) {
buffer.append("This is an empty value (REMOVE operation)");
} else {
try {
if (valueType.equals(DHTValueType.TEXT)
|| valueType.equals(DHTValueType.TEST)) {
buffer.append(new String(getValue(), "UTF-8")).append("\n");
} else {
buffer.append(ArrayUtils.toHexString(getValue())).append("\n");
}
} catch (UnsupportedEncodingException err) {
throw new RuntimeException(err);
}
}
return buffer.toString();
}
}