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1
11
12 package org.eclipse.ui.internal.navigator.dnd;
13
14 import java.util.HashMap  ;
15 import java.util.Iterator ;
16 import java.util.LinkedHashSet ;
17 import java.util.Map ;
18 import java.util.Set ;
19
20 import org.eclipse.jface.util.LocalSelectionTransfer;
21 import org.eclipse.jface.viewers.IStructuredSelection;
22 import org.eclipse.swt.dnd.TransferData;
23 import org.eclipse.ui.internal.navigator.NavigatorContentService;
24 import org.eclipse.ui.internal.navigator.extensions.CommonDragAssistantDescriptor;
25 import org.eclipse.ui.internal.navigator.extensions.NavigatorViewerDescriptor;
26 import org.eclipse.ui.navigator.CommonDragAdapterAssistant;
27 import org.eclipse.ui.navigator.CommonDropAdapterAssistant;
28 import org.eclipse.ui.navigator.INavigatorContentService;
29 import org.eclipse.ui.navigator.INavigatorDnDService;
30
31
44 public class NavigatorDnDService implements INavigatorDnDService {
45
46 private static final CommonDropAdapterAssistant[] NO_ASSISTANTS = new CommonDropAdapterAssistant[0];
47
48 private NavigatorContentService contentService;
49
50 private CommonDragAdapterAssistant[] dragAssistants;
51
52 private final Map dropAssistants = new HashMap ();
53
54
59 public NavigatorDnDService(NavigatorContentService aContentService) {
60 contentService = aContentService;
61 }
62
63 public synchronized CommonDragAdapterAssistant[] getCommonDragAssistants() {
64
65 if (dragAssistants == null)
66 initializeDragAssistants();
67 return dragAssistants;
68 }
69
70 private void initializeDragAssistants() {
71 int i = 0;
72 Set dragDescriptors = ((NavigatorViewerDescriptor) contentService
73 .getViewerDescriptor()).getDragAssistants();
74 dragAssistants = new CommonDragAdapterAssistant[dragDescriptors
75 .size()];
76 for (Iterator iter = dragDescriptors.iterator(); iter.hasNext();) {
77 CommonDragAssistantDescriptor descriptor = (CommonDragAssistantDescriptor) iter
78 .next();
79 dragAssistants[i++] = descriptor.createDragAssistant();
80 }
81 }
82
83
84 public synchronized void bindDragAssistant(CommonDragAdapterAssistant anAssistant) {
85 if(dragAssistants == null)
86 initializeDragAssistants();
87 CommonDragAdapterAssistant[] newDragAssistants = new CommonDragAdapterAssistant[dragAssistants.length + 1];
88 System.arraycopy(dragAssistants, 0, newDragAssistants, 0, dragAssistants.length);
89 newDragAssistants[dragAssistants.length] = anAssistant;
90 dragAssistants = newDragAssistants;
91 }
92
93 public CommonDropAdapterAssistant[] findCommonDropAdapterAssistants(
94 Object aDropTarget, TransferData aTransferType) {
95
96 CommonDropAdapterDescriptor[] descriptors = CommonDropDescriptorManager
98 .getInstance().findCommonDropAdapterAssistants(aDropTarget,
99 contentService);
100
101 if (descriptors.length == 0) {
102 return NO_ASSISTANTS;
103 }
104
105 if (LocalSelectionTransfer.getTransfer().isSupportedType(aTransferType)
106 && LocalSelectionTransfer.getTransfer().getSelection() instanceof IStructuredSelection) {
107 return getAssistantsBySelection(descriptors, (IStructuredSelection) LocalSelectionTransfer.getTransfer().getSelection());
108 }
109 return getAssistantsByTransferData(descriptors, aTransferType);
110 }
111
112
113 public CommonDropAdapterAssistant[] findCommonDropAdapterAssistants(
114 Object aDropTarget, IStructuredSelection theDragSelection) {
115
116 CommonDropAdapterDescriptor[] descriptors = CommonDropDescriptorManager
118 .getInstance().findCommonDropAdapterAssistants(aDropTarget,
119 contentService);
120
121 if (descriptors.length == 0) {
122 return NO_ASSISTANTS;
123 }
124
125 return getAssistantsBySelection(descriptors, theDragSelection);
126 }
127
128 private CommonDropAdapterAssistant[] getAssistantsByTransferData(
129 CommonDropAdapterDescriptor[] descriptors,
130 TransferData aTransferType) {
131
132 Set assistants = new LinkedHashSet ();
133 for (int i = 0; i < descriptors.length; i++) {
134 CommonDropAdapterAssistant asst = getAssistant(descriptors[i]);
135 if (asst.isSupportedType(aTransferType)) {
136 assistants.add(asst);
137 }
138 }
139 return (CommonDropAdapterAssistant[]) assistants
140 .toArray(new CommonDropAdapterAssistant[assistants.size()]);
141
142 }
143
144 private CommonDropAdapterAssistant[] getAssistantsBySelection(
145 CommonDropAdapterDescriptor[] descriptors, IStructuredSelection aSelection) {
146
147 Set assistants = new LinkedHashSet ();
148
149 for (int i = 0; i < descriptors.length; i++) {
150 if(descriptors[i].areDragElementsSupported(aSelection)) {
151 assistants.add(getAssistant(descriptors[i]));
152 }
153 }
154
155 return (CommonDropAdapterAssistant[]) assistants
156 .toArray(new CommonDropAdapterAssistant[assistants.size()]);
157 }
158
159 private CommonDropAdapterAssistant getAssistant(
160 CommonDropAdapterDescriptor descriptor) {
161 CommonDropAdapterAssistant asst = (CommonDropAdapterAssistant) dropAssistants
162 .get(descriptor);
163 if (asst != null) {
164 return asst;
165 }
166 synchronized (dropAssistants) {
167 asst = (CommonDropAdapterAssistant) dropAssistants.get(descriptor);
168 if (asst == null) {
169 dropAssistants.put(descriptor, (asst = descriptor
170 .createDropAssistant()));
171 asst.init(contentService);
172 }
173 }
174 return asst;
175 }
176
177 }
178 |
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