ai.platon.pulsar.skeleton.signature.SignatureComparator Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 ai.platon.pulsar.skeleton.signature;
import java.nio.ByteBuffer;
import java.util.Comparator;
public class SignatureComparator implements Comparator {
public static int compare(byte[] data1, byte[] data2) {
if (data1 == null && data2 == null)
return 0;
if (data1 == null)
return -1;
if (data2 == null)
return 1;
return _compare(data1, 0, data1.length, data2, 0, data2.length);
}
public static int compare(ByteBuffer buf1, ByteBuffer buf2) {
if (buf1 == null && buf2 == null)
return 0;
if (buf1 == null)
return -1;
if (buf2 == null)
return 1;
return _compare(buf1.array(), buf1.arrayOffset() + buf1.position(),
buf1.remaining(), buf2.array(), buf2.arrayOffset() + buf2.position(),
buf2.remaining());
}
public static int _compare(Object o1, Object o2) {
if (o1 == null && o2 == null)
return 0;
if (o1 == null)
return -1;
if (o2 == null)
return 1;
if (!(o1 instanceof byte[]))
return -1;
if (!(o2 instanceof byte[]))
return 1;
byte[] data1 = (byte[]) o1;
byte[] data2 = (byte[]) o2;
return _compare(data1, 0, data1.length, data2, 0, data2.length);
}
public static int _compare(byte[] data1, int s1, int l1, byte[] data2,
int s2, int l2) {
if (l2 > l1)
return -1;
if (l2 < l1)
return 1;
int res = 0;
for (int i = 0; i < l1; i++) {
res = (data1[s1 + i] - data2[s2 + i]);
if (res != 0)
return res;
}
return 0;
}
public int compare(Object o1, Object o2) {
return _compare(o1, o2);
}
}