1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.diagram.symbolcontribution;
14 import org.eclipse.core.runtime.IAdaptable;
17 * A basic pair structure that implements IAdaptable. It tries to adapt the
18 * paired objects to the requested class in order (first, second).
20 * @author Tuukka Lehtonen
22 * @param <T1> type of first
23 * @param <T2> type of second
25 final class AdaptablePair<T1, T2> implements IAdaptable {
26 public final T1 first;
27 public final T2 second;
28 private final int hash;
30 public static <T1, T2> AdaptablePair<T1, T2> make(T1 t1, T2 t2) {
31 return new AdaptablePair<T1, T2>(t1, t2);
34 public AdaptablePair(T1 first, T2 second) {
37 this.hash = makeHash();
41 public boolean equals(Object obj) {
44 if (!(obj.getClass().equals(this.getClass())))
46 AdaptablePair<?, ?> other = (AdaptablePair<?, ?>) obj;
47 if (other.first != first && (other.first == null || !other.first.equals(first)))
49 if (other.second != second && (other.second == null || !other.second.equals(second)))
55 public int hashCode() {
60 public String toString() {
61 return "<"+first+", "+second+">";
64 private int makeHash() {
65 return (first == null ? 0 : first.hashCode()) + (second == null ? 0 : second.hashCode())*31;
68 private Object adapt(Object o, Class<?> clazz) {
69 if (clazz.isInstance(o))
71 if (o instanceof IAdaptable)
72 return ((IAdaptable) o).getAdapter(clazz);
76 @SuppressWarnings("rawtypes")
78 public Object getAdapter(Class adapter) {
79 Object o = adapt(first, adapter);
80 return (o == null) ? adapt(second, adapter) : o;