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Copy pathHasher.java
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120 lines (97 loc) · 2.94 KB
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/*
* Copyright (c) 2012 Jan Kotek
*
* 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 org.mapdb;
import java.util.Arrays;
/**
* Calculates hash from an object. It also provides `equals` method.
* Provides an alternative hashing method for {@link org.mapdb.HTreeMap}
*
* @author Jan Kotek
*/
public interface Hasher<K> {
int hashCode(K k);
boolean equals(K k1, K k2);
Hasher BASIC = new Hasher() {
@Override
public final int hashCode( Object k) {
return k.hashCode();
}
@Override
public boolean equals(Object k1, Object k2) {
return k1.equals(k2);
}
};
Hasher<byte[]> BYTE_ARRAY = new Hasher<byte[]>() {
@Override
public final int hashCode( byte[] k) {
return Arrays.hashCode(k);
}
@Override
public boolean equals(byte[] k1, byte[] k2) {
return Arrays.equals(k1,k2);
}
};
Hasher<char[]> CHAR_ARRAY = new Hasher<char[]>() {
@Override
public final int hashCode( char[] k) {
return Arrays.hashCode(k);
}
@Override
public boolean equals(char[] k1, char[] k2) {
return Arrays.equals(k1,k2);
}
};
Hasher<int[]> INT_ARRAY = new Hasher<int[]>() {
@Override
public final int hashCode( int[] k) {
return Arrays.hashCode(k);
}
@Override
public boolean equals(int[] k1, int[] k2) {
return Arrays.equals(k1,k2);
}
};
Hasher<long[]> LONG_ARRAY = new Hasher<long[]>() {
@Override
public final int hashCode( long[] k) {
return Arrays.hashCode(k);
}
@Override
public boolean equals(long[] k1, long[] k2) {
return Arrays.equals(k1,k2);
}
};
Hasher<double[]> DOUBLE_ARRAY = new Hasher<double[]>() {
@Override
public final int hashCode( double[] k) {
return Arrays.hashCode(k);
}
@Override
public boolean equals(double[] k1, double[] k2) {
return Arrays.equals(k1,k2);
}
};
Hasher<Object[]> ARRAY = new Hasher<Object[]>() {
@Override
public final int hashCode( Object[] k) {
return Arrays.hashCode(k);
}
@Override
public boolean equals(Object[] k1, Object[] k2) {
return Arrays.equals(k1,k2);
}
};
}