1 /*******************************************************************************
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2 * Copyright (c) 2007, 2012 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.browsing.ui.swt.widgets.impl;
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14 import org.eclipse.jface.viewers.ISelection;
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15 import org.simantics.db.ReadGraph;
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16 import org.simantics.db.common.request.UnaryRead;
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17 import org.simantics.db.common.utils.Logger;
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18 import org.simantics.db.exception.DatabaseException;
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19 import org.simantics.db.management.ISessionContext;
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20 import org.simantics.db.procedure.Listener;
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21 import org.simantics.utils.ReflectionUtils;
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22 import org.simantics.utils.datastructures.Pair;
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23 import org.simantics.utils.ui.ISelectionUtils;
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26 * @author Antti Villberg
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28 * @param <Input> expected and checked input type
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29 * @param <Output> result type of factory
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31 public abstract class ReadFactoryImpl<Input, Output> implements ReadFactory<Input, Output> {
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33 final Class<?> inputClass;
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36 protected ReadFactoryImpl() {
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40 protected ReadFactoryImpl(boolean sync) {
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41 inputClass = ReflectionUtils.getSingleParameterType(getClass());
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45 public Object getIdentity(Object inputContents) {
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46 return new Pair<Object, Class<?>>(inputContents, getClass());
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49 private Object getInputContents(Object input, Class<?> inputClass) {
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50 if (inputClass.isInstance(input))
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52 if (input instanceof ISelection)
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53 return ISelectionUtils.filterSingleSelection(input, inputClass);
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58 public void listen(ISessionContext context, Object input, Listener<Output> listener) {
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59 final Object inputContents = getInputContents(input, inputClass);
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60 if (inputContents != null) {
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61 UnaryRead<Object, Output> read = new UnaryRead<Object, Output>(getIdentity(inputContents)) {
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62 @SuppressWarnings("unchecked")
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64 public Output perform(ReadGraph graph) throws DatabaseException {
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65 return ReadFactoryImpl.this.perform(graph, (Input) inputContents);
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68 public String toString() {
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69 return getIdentity(inputContents).toString();
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74 Output out = context.getSession().syncRequest(read, listener);
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75 listener.execute(out);
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76 } catch (DatabaseException e) {
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77 Logger.defaultLogError(e);
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80 context.getSession().asyncRequest(read, listener);
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84 abstract public Output perform(ReadGraph graph, Input input) throws DatabaseException;
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