T2.java

/* This program is free software: you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public License
 as published by the Free Software Foundation, either version 3 of
 the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

package org.opentripplanner.common.model;

import java.io.Serializable;

/**
 * An ordered pair of objects of potentially different types
 *
 */
public class T2<E1, E2> implements Serializable {

    private static final long serialVersionUID = 1L;

    private final E1 _first;

    private final E2 _second;

    public T2(E1 first, E2 second) {
        _first = first;
        _second = second;
    }

    public E1 getFirst() {
        return _first;
    }

    public E2 getSecond() {
        return _second;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((_first == null) ? 0 : _first.hashCode());
        result = prime * result + ((_second == null) ? 0 : _second.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        T2<?, ?> other = (T2<?, ?>) obj;
        if (_first == null) {
            if (other._first != null)
                return false;
        } else if (!_first.equals(other._first))
            return false;
        if (_second == null) {
            if (other._second != null)
                return false;
        } else if (!_second.equals(other._second))
            return false;
        return true;
    }
    
    public String toString() {
        return "T2(" + _first + ", " + _second + ")";
    }
}