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19
20 package org.netbeans.modules.debugger.jpda.ui.actions;
21
22 import java.awt.event.ActionEvent  ;
23 import java.beans.PropertyChangeEvent ;
24 import java.beans.PropertyChangeListener ;
25 import java.lang.ref.Reference ;
26 import java.lang.ref.WeakReference ;
27 import javax.swing.AbstractAction ;
28 import javax.swing.Action ;
29 import javax.swing.SwingUtilities ;
30 import org.netbeans.api.debugger.DebuggerEngine;
31 import org.netbeans.api.debugger.DebuggerManager;
32 import org.netbeans.api.debugger.DebuggerManagerAdapter;
33 import org.netbeans.api.debugger.jpda.JPDADebugger;
34 import org.netbeans.modules.debugger.jpda.ui.Evaluator;
35 import org.openide.util.HelpCtx;
36 import org.openide.util.NbBundle;
37 import org.openide.util.actions.CallableSystemAction;
38
39
44 public class EvaluateAction extends AbstractAction implements PropertyChangeListener ,
45 Runnable {
46
47 private EnableListener listener;
48 private transient Reference lastDebuggerRef = new WeakReference (null);
49
50 public EvaluateAction () {
51 listener = new EnableListener (this);
52 DebuggerManager.getDebuggerManager().addDebuggerListener(
53 DebuggerManager.PROP_CURRENT_ENGINE,
54 listener);
55 putValue (
56 Action.NAME,
57 NbBundle.getMessage(EvaluateAction.class, "CTL_Evaluate") );
59 checkEnabled();
60 }
61
62 private synchronized boolean canBeEnabled() {
63 DebuggerEngine de = DebuggerManager.getDebuggerManager().getCurrentEngine();
64 if (de == null) return false;
65 JPDADebugger debugger = (JPDADebugger) de.lookupFirst(null, JPDADebugger.class);
66 JPDADebugger lastDebugger = (JPDADebugger) lastDebuggerRef.get();
67 if (lastDebugger != null && debugger != lastDebugger) {
68 lastDebugger.removePropertyChangeListener(
69 JPDADebugger.PROP_CURRENT_THREAD,
70 this);
71 lastDebuggerRef = new WeakReference (null);
72 }
73 if (debugger != null) {
74 lastDebuggerRef = new WeakReference (debugger);
75 debugger.addPropertyChangeListener(
76 JPDADebugger.PROP_CURRENT_THREAD,
77 this);
78 return (debugger.getCurrentThread() != null);
79 } else {
80 return false;
81 }
82 }
83
84 private void checkEnabled() {
85 SwingUtilities.invokeLater(this);
86 }
87
88 public void run() {
89 setEnabled(canBeEnabled());
90 }
91
92 public void actionPerformed (ActionEvent evt) {
93 DebuggerEngine de = DebuggerManager.getDebuggerManager().getCurrentEngine();
94 if (de == null) return ;
95 JPDADebugger debugger = (JPDADebugger) de.lookupFirst(null, JPDADebugger.class);
96 if (debugger == null) return ;
97 Evaluator.open(debugger);
98 }
99
100 public void propertyChange(PropertyChangeEvent propertyChangeEvent) {
101 SwingUtilities.invokeLater(new Runnable () {
102 public void run() {
103 synchronized (this) {
104 JPDADebugger lastDebugger = (JPDADebugger) lastDebuggerRef.get();
105 if (lastDebugger != null) {
106 setEnabled(lastDebugger.getCurrentThread() != null);
107 }
108 }
109 }
110 });
111 }
112
113 protected void finalize() throws Throwable {
114 DebuggerManager.getDebuggerManager().removeDebuggerListener(
115 DebuggerManager.PROP_CURRENT_ENGINE,
116 listener);
117 }
118
119
120 private static class EnableListener extends DebuggerManagerAdapter {
121
122 private Reference actionRef;
123
124 public EnableListener(EvaluateAction action) {
125 actionRef = new WeakReference (action);
126 }
127
128 public void propertyChange(PropertyChangeEvent evt) {
129 EvaluateAction action = (EvaluateAction) actionRef.get();
130 if (action != null) {
131 action.checkEnabled();
132 }
133 }
134
135 }
136
137 }
138 |
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