com.metamx.common.Pair Maven / Gradle / Ivy
/*
* Copyright 2011,2012 Metamarkets Group Inc.
*
* 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.metamx.common;
import com.google.common.base.Function;
import java.util.Comparator;
/**
*/
public class Pair
{
public static Pair of(T1 lhs, T2 rhs) {
return new Pair<>(lhs, rhs);
}
public final T1 lhs;
public final T2 rhs;
public Pair(T1 lhs, T2 rhs)
{
this.lhs = lhs;
this.rhs = rhs;
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Pair pair = (Pair) o;
if (lhs != null ? !lhs.equals(pair.lhs) : pair.lhs != null) {
return false;
}
if (rhs != null ? !rhs.equals(pair.rhs) : pair.rhs != null) {
return false;
}
return true;
}
@Override
public int hashCode()
{
int result = lhs != null ? lhs.hashCode() : 0;
result = 31 * result + (rhs != null ? rhs.hashCode() : 0);
return result;
}
@Override
public String toString()
{
return "Pair{" +
"lhs=" + lhs +
", rhs=" + rhs +
'}';
}
public static Function, T1> lhsFn()
{
return new Function, T1>()
{
@Override
public T1 apply(Pair input)
{
return input.lhs;
}
};
}
public static Function, T2> rhsFn()
{
return new Function, T2>()
{
@Override
public T2 apply(Pair input)
{
return input.rhs;
}
};
}
public static Comparator> lhsComparator(final Comparator comparator)
{
return new Comparator>()
{
@Override
public int compare(Pair o1, Pair o2)
{
return comparator.compare(o1.lhs, o2.lhs);
}
};
}
}