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1
11 package org.eclipse.jdt.internal.ui.navigator;
12
13
14 import org.eclipse.jface.viewers.IStructuredContentProvider;
15 import org.eclipse.jface.viewers.ITreeContentProvider;
16 import org.eclipse.jface.viewers.StructuredViewer;
17 import org.eclipse.jface.viewers.Viewer;
18 import org.eclipse.jface.viewers.ViewerFilter;
19
20 import org.eclipse.ui.navigator.CommonViewer;
21 import org.eclipse.ui.navigator.IExtensionStateModel;
22 import org.eclipse.ui.navigator.INavigatorContentService;
23
24 import org.eclipse.jdt.core.IPackageFragment;
25 import org.eclipse.jdt.core.JavaModelException;
26
27
33 public abstract class NonEssentialElementsFilter extends ViewerFilter {
34
35 private static final String  JAVA_EXTENSION_ID = "org.eclipse.jdt.java.ui.javaContent";
37 private boolean isStateModelInitialized = false;
38 private IExtensionStateModel fStateModel = null;
39
40 private INavigatorContentService fContentService;
41
42 private ViewerFilter fDelegateFilter;
43
44 protected NonEssentialElementsFilter(ViewerFilter delegateFilter) {
45 fDelegateFilter = delegateFilter;
46 }
47
48
51 public boolean select(Viewer viewer, Object parent, Object element) {
52 if (!isStateModelInitialized) {
53 initStateModel(viewer);
54 }
55 if (fContentService == null || fStateModel == null) {
56 return true;
57 } else if (element instanceof IPackageFragment) {
58 if (isApplicable() && viewer instanceof StructuredViewer) {
59 boolean isHierarchicalLayout= !fStateModel.getBooleanProperty(IExtensionStateConstants.Values.IS_LAYOUT_FLAT);
60 try {
61 IPackageFragment fragment = (IPackageFragment) element;
62 if (isHierarchicalLayout && !fragment.isDefaultPackage() && fragment.hasSubpackages()) {
63 return hasFilteredChildren((StructuredViewer) viewer, fragment);
64 }
65 } catch (JavaModelException e) {
66 return false;
67 }
68 }
69 }
70 return doSelect(viewer, parent, element);
71 }
72
73 private boolean hasFilteredChildren(StructuredViewer viewer, IPackageFragment fragment) {
74 Object [] children= getRawChildren(viewer, fragment);
75 ViewerFilter[] filters= viewer.getFilters();
76 for (int i= 0; i < filters.length; i++) {
77 children= filters[i].filter(viewer, fragment, children);
78 if (children.length == 0)
79 return false;
80 }
81 return true;
82 }
83
84 private Object [] getRawChildren(StructuredViewer viewer, IPackageFragment fragment) {
85 IStructuredContentProvider provider = (IStructuredContentProvider) viewer.getContentProvider();
86 if (provider instanceof ITreeContentProvider) {
87 return ((ITreeContentProvider)provider).getChildren(fragment);
88 }
89 return provider.getElements(fragment);
90 }
91
92 protected boolean doSelect(Viewer viewer, Object parent, Object element) {
93 return fDelegateFilter.select(viewer, parent, element);
94 }
95
96 private boolean isApplicable() {
97 return fContentService != null && fContentService.isVisible(JAVA_EXTENSION_ID) && fContentService.isActive(JAVA_EXTENSION_ID);
98 }
99
100 private synchronized void initStateModel(Viewer viewer) {
101 if (!isStateModelInitialized) {
102 if (viewer instanceof CommonViewer) {
103
104 CommonViewer commonViewer = (CommonViewer) viewer;
105 fContentService = commonViewer.getNavigatorContentService();
106 fStateModel = fContentService.findStateModel(JAVA_EXTENSION_ID);
107
108 isStateModelInitialized = true;
109 }
110 }
111 }
112 }
113 |
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