/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.github.ggrandes.kvstore.holders;
import java.nio.ByteBuffer;
import java.util.Arrays;
import com.github.ggrandes.kvstore.structures.hash.FixedIntHashMap;
/**
* Example Holder for byte[8] values
*
* @author Guillermo Grandes / guillermo.grandes[at]gmail.com
*/
public final class ByteArray8Holder extends DataHolder<ByteArray8Holder> {
private static final FixedIntHashMap<ByteArray8Holder> cache = new FixedIntHashMap<ByteArray8Holder>(
4096, ByteArray8Holder.class);
private final byte[] value;
public static ByteArray8Holder valueOf(final byte[] value) {
final int hash = Arrays.hashCode(value);
final ByteArray8Holder cachedKey = cache.get(hash);
if (cachedKey != null) {
if (cachedKey.value == value) {
return cachedKey;
}
}
final ByteArray8Holder newKey = new ByteArray8Holder(value);
cache.put(hash, newKey);
return newKey;
}
/**
* Constructor necesario para la deserializacion
*/
public ByteArray8Holder() {
this(null);
};
private ByteArray8Holder(final byte[] value) {
this.value = value;
}
public byte[] getValue() {
return value;
}
// ========= Basic Object methods =========
@Override
public String toString() {
return getHex(value); // Arrays.toString(value);
}
@Override
public int hashCode() {
return Arrays.hashCode(value);
}
private static final String HEXES = "0123456789ABCDEF";
public static String getHex(final byte[] raw) {
if (raw == null) {
return null;
}
final StringBuilder hex = new StringBuilder(2 * raw.length);
for (final byte b : raw) {
hex.append(HEXES.charAt((b & 0xF0) >> 4)).append(HEXES.charAt((b & 0x0F)));
}
return hex.toString();
}
// ========= Comparable =========
@Override
public boolean equals(final Object obj) {
if (obj instanceof ByteArray8Holder) {
return Arrays.equals(value, ((ByteArray8Holder) obj).getValue());
}
return false;
}
@Override
public int compareTo(final ByteArray8Holder anotherLong) {
final byte[] thisVal = this.value;
final byte[] anotherVal = anotherLong.value;
return compare(thisVal, anotherVal);
}
private final static int compare(final byte[] left, final byte[] right) {
for (int i = 0, j = 0; i < left.length && j < right.length; i++, j++) {
int a = (left[i] & 0xff);
int b = (right[j] & 0xff);
if (a != b) {
return a - b;
}
}
return left.length - right.length;
}
// ========= Serialization =========
@Override
public final int byteLength() {
return 8;
}
@Override
public void serialize(final ByteBuffer buf) {
buf.put(value, 0, Math.min(byteLength(), value.length));
}
@Override
public ByteArray8Holder deserialize(final ByteBuffer buf) {
final byte[] newvalue = new byte[byteLength()];
buf.get(newvalue, 0, newvalue.length);
return valueOf(newvalue);
}
// =========
/**
* Simple Test
*/
public static void main(final String[] args) {
ByteArray8Holder b1 = new ByteArray8Holder(new byte[] {
0, 0, 0, 0, 0, 0, 0, 1
});
ByteArray8Holder b2 = new ByteArray8Holder(new byte[] {
0, 0, 0, 0, 0, 0, 0, 2
});
ByteArray8Holder b2b = new ByteArray8Holder(new byte[] {
0, 0, 0, 0, 0, 0, 0, 2
});
System.out.println("compareTo=" + Integer.valueOf(0).compareTo(Integer.valueOf(1)));
System.out.println("b1.compareTo(b2)=" + b1.compareTo(b2));
System.out.println("b1.equals(b2)=" + b1.equals(b2));
System.out.println("b2.equals(b2b)=" + b2.equals(b2b));
System.out.println("b1.hashCode()=" + b1.hashCode());
System.out.println("b2.hashCode()=" + b2.hashCode());
System.out.println("b2b.hashCode()=" + b2b.hashCode());
System.out.println("b2b.toString()=" + b2b.toString());
}
}