org.nd4j.common.primitives.Pair Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.common.primitives;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
import java.util.Arrays;
import org.nd4j.common.base.Preconditions;
/**
* Simple pair implementation
*
* @author [email protected]
*/
@AllArgsConstructor
@Data
@NoArgsConstructor
@Builder
public class Pair implements Serializable {
private static final long serialVersionUID = 119L;
protected K key;
protected V value;
@Override
public String toString() {
return "Pair{" +
"key=" + (key instanceof int[] ? Arrays.toString((int[]) key) : key) +
", value=" + (value instanceof int[] ? Arrays.toString((int[]) value) : value) +
'}';
}
public K getLeft() {
return key;
}
public V getRight() {
return value;
}
public K getFirst() {
return key;
}
public V getSecond() {
return value;
}
public void setFirst(K first) {
key = first;
}
public void setSecond(V second) {
value = second;
}
public static Pair of(T key, E value) {
return new Pair(key, value);
}
public static Pair makePair(T key, E value) {
return new Pair(key, value);
}
public static Pair create(T key, E value) {
return new Pair(key, value);
}
public static Pair pairOf(T key, E value) {
return new Pair(key, value);
}
public static Pair fromArray(T[] arr){
Preconditions.checkArgument(arr.length == 2,
"Can only create a pair from an array with two values, got %s", arr.length);
return new Pair<>(arr[0], arr[1]);
}
}