io.servicefabric.transport.utils.KVPair Maven / Gradle / Ivy

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package io.servicefabric.transport.utils;

/**
 * Generic class that represent key-value pair of two different values.
 * Two pair is equal when both its key and value are equal. It is immutable.
 *
 * @param  type of key
 * @param  type of value
 */
public class KVPair {

	private final K key;
	private final V value;

	public KVPair(K key, V value) {
		this.key = key;
		this.value = value;
	}

	/**
	 *
	 * @return first value
	 */
	public K getKey() {
		return key;
	}

	/**
	 *
	 * @return second value
	 */
	public V getValue() {
		return value;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		KVPair pair = (KVPair) o;

		if (key != null ? !key.equals(pair.key) : pair.key != null)
			return false;
		if (value != null ? !value.equals(pair.value) : pair.value != null)
			return false;

		return true;
	}

	@Override
	public int hashCode() {
		int result = key != null ? key.hashCode() : 0;
		result = 31 * result + (value != null ? value.hashCode() : 0);
		return result;
	}

	@Override
	public String toString() {
		final StringBuilder sb = new StringBuilder("Pair{");
		sb.append("first=").append(key);
		sb.append(", second=").append(value);
		sb.append('}');
		return sb.toString();
	}
}