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package com.sun.javafx.runtime.location; |
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import java.lang.ref.WeakReference; |
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import java.util.*; |
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36 | 11557 | public abstract class AbstractLocation implements Location { |
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private boolean isValid, mustRemoveDependencies; |
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protected List<ChangeListener> listeners; |
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protected List<WeakReference<Location>> dependentLocations; |
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private WeakReference<Location> weakMe; |
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private int iterationDepth; |
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private List<WeakReference<Location>> deferredDependencies; |
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public boolean isValid() { |
59 | 40987 | return isValid; |
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} |
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public boolean isMutable() { |
63 | 0 | return true; |
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} |
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protected void setValid() { |
67 | 28951 | isValid = true; |
68 | 28951 | } |
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public void invalidate() { |
71 | 5864 | isValid = false; |
72 | 5864 | doInvalidateDependencies(); |
73 | 5864 | } |
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protected void invalidateDependencies() { |
81 | 26049 | doInvalidateDependencies(); |
82 | 26049 | } |
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private void purgeDeadDependencies() { |
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86 | 5478 | if (dependentLocations != null) { |
87 | 5455 | for (Iterator<WeakReference<Location>> iterator = dependentLocations.iterator(); iterator.hasNext();) { |
88 | 19846 | WeakReference<Location> locationRef = iterator.next(); |
89 | 19846 | Location loc = locationRef.get(); |
90 | 19846 | if (loc == null) |
91 | 29 | iterator.remove(); |
92 | 19846 | } |
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} |
94 | 5478 | } |
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private void doInvalidateDependencies() { |
97 | 31913 | notifyChangeListeners(); |
98 | 31913 | if (dependentLocations != null) { |
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try { |
101 | 1535 | ++iterationDepth; |
102 | 1535 | for (WeakReference<Location> locationRef : dependentLocations) { |
103 | 2236 | Location loc = locationRef.get(); |
104 | 2236 | if (loc == null) |
105 | 11 | mustRemoveDependencies = true; |
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else { |
107 | 2225 | loc.invalidate(); |
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110 | 2225 | if (locationRef.get() == null) |
111 | 3 | mustRemoveDependencies = true; |
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} |
113 | 2236 | } |
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} |
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finally { |
116 | 1535 | --iterationDepth; |
117 | 1535 | if (iterationDepth == 0) { |
118 | 1535 | if (deferredDependencies != null && deferredDependencies.size() > 0) { |
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120 | 7 | purgeDeadDependencies(); |
121 | 7 | dependentLocations.addAll(deferredDependencies); |
122 | 7 | deferredDependencies.clear(); |
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} |
124 | 1535 | if (mustRemoveDependencies) { |
125 | 14 | purgeDeadDependencies(); |
126 | 14 | mustRemoveDependencies = false; |
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} |
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} |
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} |
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} |
131 | 31913 | } |
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private void notifyChangeListeners() { |
136 | 31913 | if (listeners != null) { |
137 | 466 | for (Iterator<ChangeListener> iterator = listeners.iterator(); iterator.hasNext();) { |
138 | 473 | ChangeListener listener = iterator.next(); |
139 | 473 | if (!listener.onChange()) |
140 | 3 | iterator.remove(); |
141 | 473 | } |
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} |
143 | 31913 | } |
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public void addDependentLocation(WeakReference<Location> locationRef) { |
146 | 5412 | if (dependentLocations == null) |
147 | 4802 | dependentLocations = new ArrayList<WeakReference<Location>>(); |
148 | 5412 | if (iterationDepth > 0) { |
149 | 9 | if (deferredDependencies == null) |
150 | 5 | deferredDependencies = new ArrayList<WeakReference<Location>>(); |
151 | 9 | deferredDependencies.add(locationRef); |
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} |
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else { |
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155 | 5403 | purgeDeadDependencies(); |
156 | 5403 | dependentLocations.add(locationRef); |
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} |
158 | 5412 | } |
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public void addChangeListener(ChangeListener listener) { |
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164 | 122 | if (listeners == null) |
165 | 117 | listeners = new ArrayList<ChangeListener>(); |
166 | 122 | listeners.add(listener); |
167 | 122 | } |
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public void addWeakListener(ChangeListener listener) { |
170 | 2 | addChangeListener(new WeakListener(listener)); |
171 | 2 | } |
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public void addDependencies(Location... dependencies) { |
174 | 5544 | if (dependencies.length > 0) { |
175 | 2499 | WeakReference<Location> wr = new WeakReference<Location>(this); |
176 | 7067 | for (Location dep : dependencies) |
177 | 4568 | dep.addDependentLocation(wr); |
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} |
179 | 5544 | } |
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public void addDynamicDependency(Location location) { |
182 | 1100 | if (weakMe == null) |
183 | 1097 | weakMe = new WeakReference<Location>(this); |
184 | 1100 | location.addDependentLocation(weakMe); |
185 | 1100 | } |
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public void clearDynamicDependencies() { |
188 | 1098 | if (weakMe != null) { |
189 | 588 | weakMe.clear(); |
190 | 588 | weakMe = null; |
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} |
192 | 1098 | } |
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public <T extends Location> T addDynamicDependent(T dep) { |
195 | 0 | addDynamicDependency(dep); |
196 | 0 | return dep; |
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} |
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public <T extends Location> T addStaticDependent(T dep) { |
200 | 0 | addDependencies(dep); |
201 | 0 | return dep; |
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} |
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public Collection<ChangeListener> getListeners() { |
205 | 80 | if (listeners == null) |
206 | 16 | return Collections.emptySet(); |
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else |
208 | 64 | return Collections.unmodifiableCollection(listeners); |
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} |
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public void update() { |
212 | 0 | } |
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int getListenerCount() { |
216 | 54 | purgeDeadDependencies(); |
217 | 54 | return (listeners == null ? 0 : listeners.size()) |
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+ (dependentLocations == null ? 0 : dependentLocations.size()); |
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} |
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} |
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class WeakListener extends WeakReference<ChangeListener> implements ChangeListener { |
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public WeakListener(ChangeListener referent) { |
224 | 2 | super(referent); |
225 | 2 | } |
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public boolean onChange() { |
228 | 6 | ChangeListener listener = get(); |
229 | 6 | return listener == null ? false : listener.onChange(); |
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} |
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} |
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