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Package: BasicDetailViewCache$Record
BasicDetailViewCache$Record
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| BasicDetailViewCache.Record(BasicDetailViewCache, EClass, ECPSWTView) |
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| contextDisposed(ViewModelContext) |
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| dispose() |
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| get() |
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Coverage
1: /*******************************************************************************
2: * Copyright (c) 2011-2019 EclipseSource Muenchen GmbH and others.
3: *
4: * All rights reserved. This program and the accompanying materials
5: * are made available under the terms of the Eclipse Public License 2.0
6: * which accompanies this distribution, and is available at
7: * https://www.eclipse.org/legal/epl-2.0/
8: *
9: * SPDX-License-Identifier: EPL-2.0
10: *
11: * Contributors:
12: * Eugen Neufeld - initial API and implementation
13: * Christian W. Damus - bug 527686
14: ******************************************************************************/
15: package org.eclipse.emf.ecp.view.spi.swt.masterdetail;
16:
17: import java.util.ArrayList;
18: import java.util.LinkedHashMap;
19: import java.util.List;
20: import java.util.Map;
21: import java.util.Optional;
22: import java.util.function.Supplier;
23:
24: import org.eclipse.emf.ecore.EClass;
25: import org.eclipse.emf.ecore.EObject;
26: import org.eclipse.emf.ecp.ui.view.swt.ECPSWTView;
27: import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
28: import org.eclipse.emf.ecp.view.spi.context.ViewModelContextDisposeListener;
29:
30: /**
31: * A default implementation of the {@link DetailViewCache} that uses the {@link EClass} as the key.
32: *
33: * @since 1.22
34: */
35: public class BasicDetailViewCache implements DetailViewCache {
36:
37: private final Map<EClass, Record> cache;
38:
39: /**
40: * Creates a cache with maximal 5 entries.
41: */
42: public BasicDetailViewCache() {
43: this(5);
44: }
45:
46: /**
47: * Creates a cache with a custom number of maximal entries.
48: *
49: * @param maxEntries The number of maximal entries to cache
50: */
51: public BasicDetailViewCache(final int maxEntries) {
52: cache = new LinkedHashMap<EClass, Record>(maxEntries + 1, .75F, true) {
53: private static final long serialVersionUID = 1L;
54:
55: // This method is called just after a new entry has been added
56: @Override
57: public boolean removeEldestEntry(Map.Entry<EClass, Record> eldest) {
58: final boolean result = size() > maxEntries;
59: if (result) {
60: eldest.getValue().dispose();
61: }
62: return result;
63: }
64: };
65: }
66:
67: @Override
68: public boolean isCached(EObject selection) {
69: return selection != null && cache.containsKey(selection.eClass());
70: }
71:
72: @Override
73: public ECPSWTView getCachedView(EObject selection) {
74: return getRecord(selection).map(Supplier::get).orElse(null);
75: }
76:
77: private Optional<Record> getRecord(EObject selection) {
78: return Optional.ofNullable(selection).map(EObject::eClass).map(cache::get);
79: }
80:
81: @Override
82: public boolean cacheView(ECPSWTView ecpView) {
83: // Don't attempt to cache a view already disposed
84: if (ecpView == null || ecpView.getSWTControl().isDisposed()) {
85: return false;
86: }
87:
88: final EClass key = ecpView.getViewModelContext().getDomainModel().eClass();
89: final Record existing = cache.get(key);
90:
91: if (existing == null) {
92: // Easy. Add it
93: cache.put(key, new Record(key, ecpView));
94: } else if (existing.get() != ecpView) {
95: // Not the same view. Dispose the old
96: existing.dispose();
97: cache.put(key, new Record(key, ecpView));
98: } // Otherwise we already have cached exactly this view
99:
100: return true;
101: }
102:
103: @Override
104: public void clear() {
105: final List<Record> records = new ArrayList<>(cache.values());
106: cache.clear();
107: records.forEach(Record::dispose);
108: }
109:
110: //
111: // Nested types
112: //
113:
114: /**
115: * Self-disposing record of the caching of a rendered view for some {@link EClass}.
116: * Disposes itself when the view context is disposed.
117: */
118: private final class Record implements ViewModelContextDisposeListener, Supplier<ECPSWTView> {
119:
120: private final EClass eClass;
121: private final ECPSWTView ecpView;
122:
123: Record(EClass eClass, ECPSWTView ecpView) {
124: super();
125:
126: this.eClass = eClass;
127: this.ecpView = ecpView;
128:
129: ecpView.getViewModelContext().registerDisposeListener(this);
130: }
131:
132: void dispose() {
133: ecpView.dispose();
134: }
135:
136: @Override
137: public ECPSWTView get() {
138: return ecpView;
139: }
140:
141: @Override
142: public void contextDisposed(ViewModelContext viewModelContext) {
143: dispose();
144: cache.remove(eClass, this);
145: }
146: }
147:
148: }