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.g2d.element.handler.impl;
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14 import org.simantics.g2d.diagram.handler.Topology.Terminal;
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15 import org.simantics.g2d.element.IElement;
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16 import org.simantics.g2d.element.handler.TerminalData;
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17 import org.simantics.utils.datastructures.hints.HintContext;
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18 import org.simantics.utils.datastructures.hints.IHintContext;
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19 import org.simantics.utils.datastructures.hints.IHintContext.Key;
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20 import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
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23 * A straight-forward implementation of the {@link TerminalData} element handler
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24 * interface. It uses an element's hint context to store a separate HintContext
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27 * @author Tuukka Lehtonen
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29 public class TerminalDataImpl implements TerminalData {
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31 private static final long serialVersionUID = -2131030904280472077L;
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33 public static final TerminalDataImpl INSTANCE = new TerminalDataImpl();
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35 static class TerminalKey extends KeyOf {
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36 private final Terminal terminal;
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37 public TerminalKey(Terminal terminal) {
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38 super(IHintContext.class);
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39 if (terminal == null)
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40 throw new NullPointerException("null terminal");
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41 this.terminal = terminal;
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44 public int hashCode() {
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45 return terminal.hashCode();
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48 public boolean equals(Object obj) {
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51 if (!(obj instanceof TerminalKey))
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53 TerminalKey other = (TerminalKey) obj;
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54 return terminal.equals(other.terminal);
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57 public String toString() {
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58 return "TERMINAL_DATA(" + terminal + ")";
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63 public <T> T getHint(IElement e, Terminal t, Key key) {
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64 IHintContext context = e.getHint(new TerminalKey(t));
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65 if (context == null)
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67 return context.getHint(key);
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71 public void setHint(IElement e, Terminal t, Key key, Object value) {
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72 Key terminalKey = new TerminalKey(t);
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73 IHintContext context = e.getHint(terminalKey);
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74 if (context == null) {
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75 context = new HintContext();
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76 e.setHint(terminalKey, context);
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78 context.setHint(key, value);
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