Pair.java

// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.utils;

public class Pair<T, U> {
    T t;
    U u;
    
    protected Pair() {
    	
    }
    
    public Pair(T t, U u) {
        this.t = t;
        this.u = u;
    }
    
    public T first() {
        return t;
    }
    
    public U second() {
        return u;
    }
    
    public U second(U value) {
    	u = value;
    	return u;
    }
    
    public T first(T value) {
    	t = value;
    	return t;
    }
    
    public void set(T t, U u) {
        this.t = t;
        this.u = u;
    }
    
    @Override
    // Note: This means any two pairs with null for both values will match each
    // other but what can I do?  This is due to stupid type erasure.
    public int hashCode() {
        return (t != null ? t.hashCode() : 0) | (u != null ? u.hashCode() : 0);
    }
    
    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Pair)) {
            return false;
        }
        Pair<?, ?> that = (Pair<?, ?>)obj;
        return (t != null ? t.equals(that.t) : that.t == null) && (u != null ? u.equals(that.u) : that.u == null);
    }
    
    @Override
    public String toString() {
        StringBuilder b = new StringBuilder("P[");
        b.append((t != null) ? t.toString() : "null");
        b.append(":");
        b.append((u != null) ? u.toString() : "null");
        b.append("]");
        return b.toString();
    }
}