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.content;
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14 import java.util.HashMap;
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15 import java.util.Map;
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17 import org.simantics.db.Resource;
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20 * terminal <-> connection point
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22 * @author Tuukka Lehtonen
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24 public class TerminalMap {
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26 public static final TerminalMap EMPTY = new TerminalMap(0) {
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27 public void put(Resource terminal, Resource connectionPoint) {
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28 throw new UnsupportedOperationException("immutable TerminalMap");
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32 private final Map<Resource, Resource> leftToRight;
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33 private final Map<Resource, Resource> rightToLeft;
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35 public TerminalMap(int initialCapacity) {
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36 leftToRight = new HashMap<Resource, Resource>(initialCapacity);
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37 rightToLeft = new HashMap<Resource, Resource>(initialCapacity);
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40 public Resource getConnectionPoint(Resource terminal) {
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41 return leftToRight.get(terminal);
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44 public Resource getTerminal(Resource connectionPoint) {
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45 return rightToLeft.get(connectionPoint);
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48 public void put(Resource terminal, Resource connectionPoint) {
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49 leftToRight.put(terminal, connectionPoint);
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50 rightToLeft.put(connectionPoint, terminal);
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