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