Pair.java

/*
Copyright (c) 2008 Arno Haase.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/epl-v10.html

Contributors:
    Arno Haase - initial API and implementation
 */
package org.eclipse.xtend.backend.util;


/**
 * 
 * @author Arno Haase (http://www.haase-consulting.com)
 */
public final class Pair<T1, T2> {
    private final T1 _o1;
    private final T2 _o2;
    
    public Pair (T1 o1, T2 o2) {
        _o1 = o1;
        _o2 = o2;
    }

    public T1 getFirst() {
        return _o1;
    }

    public T2 getSecond() {
        return _o2;
    }
    
    public Object getFirstAsObject () {
    	return _o1;
    }
    
    public Object getSecondAsObject () {
    	return _o2;
    }

    @Override
    public String toString () {
        return "[" + _o1 + ", " + _o2 + "]";
    }
    
    @Override
    public int hashCode() {
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + ((_o1 == null) ? 0 : _o1.hashCode());
        result = PRIME * result + ((_o2 == null) ? 0 : _o2.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;
        final Pair<?, ?> other = (Pair<?, ?>) obj;
        if (_o1 == null) {
            if (other._o1 != null)
                return false;
        } else if (!_o1.equals(other._o1))
            return false;
        if (_o2 == null) {
            if (other._o2 != null)
                return false;
        } else if (!_o2.equals(other._o2))
            return false;
        return true;
    }
}