KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > eclipse > jdt > internal > ui > viewsupport > SourcePositionComparator


1 /*******************************************************************************
2  * Copyright (c) 2000, 2006 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.ui.viewsupport;
12
13 import org.eclipse.jface.viewers.Viewer;
14 import org.eclipse.jface.viewers.ViewerComparator;
15
16 import org.eclipse.jdt.core.Flags;
17 import org.eclipse.jdt.core.IClassFile;
18 import org.eclipse.jdt.core.ICompilationUnit;
19 import org.eclipse.jdt.core.IJavaElement;
20 import org.eclipse.jdt.core.IMember;
21 import org.eclipse.jdt.core.ISourceRange;
22 import org.eclipse.jdt.core.ISourceReference;
23 import org.eclipse.jdt.core.IType;
24 import org.eclipse.jdt.core.JavaModelException;
25
26
27 /**
28  * Viewer sorter which sorts the Java elements like
29  * they appear in the source.
30  *
31  * @since 3.2
32  */
33 public class SourcePositionComparator extends ViewerComparator {
34
35     /*
36      * @see org.eclipse.jface.viewers.ViewerSorter#compare(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
37      */
38     public int compare(Viewer viewer, Object JavaDoc e1, Object JavaDoc e2) {
39         if (!(e1 instanceof ISourceReference))
40             return 0;
41         if (!(e2 instanceof ISourceReference))
42             return 0;
43         
44         IJavaElement parent1= ((IJavaElement)e1).getParent();
45         if (parent1 == null || !parent1.equals(((IJavaElement)e2).getParent())) {
46                 IType t1= getOutermostDeclaringType(e1);
47                 if (t1 == null)
48                     return 0;
49                 
50                 IType t2= getOutermostDeclaringType(e2);
51                 try {
52                     if (!t1.equals(t2)) {
53                         if (t2 == null)
54                             return 0;
55
56                         if (Flags.isPublic(t1.getFlags()) && Flags.isPublic(t2.getFlags()))
57                             return 0;
58
59                         if (!t1.getPackageFragment().equals(t2.getPackageFragment()))
60                             return 0;
61
62                         ICompilationUnit cu1= (ICompilationUnit)((IJavaElement)e1).getAncestor(IJavaElement.COMPILATION_UNIT);
63                         if (cu1 != null) {
64                             if (!cu1.equals(((IJavaElement)e2).getAncestor(IJavaElement.COMPILATION_UNIT)))
65                                 return 0;
66                         } else {
67                             IClassFile cf1= (IClassFile)((IJavaElement)e1).getAncestor(IJavaElement.CLASS_FILE);
68                             if (cf1 == null)
69                                 return 0;
70                             IClassFile cf2= (IClassFile)((IJavaElement)e2).getAncestor(IJavaElement.CLASS_FILE);
71                             String JavaDoc source1= cf1.getSource();
72                             if (source1 != null && !source1.equals(cf2.getSource()))
73                                 return 0;
74                         }
75                     }
76                 } catch (JavaModelException e3) {
77                     return 0;
78                 }
79         }
80         
81         try {
82             ISourceRange sr1= ((ISourceReference)e1).getSourceRange();
83             ISourceRange sr2= ((ISourceReference)e2).getSourceRange();
84             if (sr1 == null || sr2 == null)
85                 return 0;
86             
87             return sr1.getOffset() - sr2.getOffset();
88             
89         } catch (JavaModelException e) {
90             return 0;
91         }
92     }
93
94     private IType getOutermostDeclaringType(Object JavaDoc element) {
95         if (!(element instanceof IMember))
96             return null;
97         
98         IType declaringType;
99         if (element instanceof IType)
100             declaringType= (IType)element;
101         else {
102             declaringType= ((IMember)element).getDeclaringType();
103             if (declaringType == null)
104                 return null;
105         }
106         
107         IType declaringTypeDeclaringType= declaringType.getDeclaringType();
108         while (declaringTypeDeclaringType != null) {
109             declaringType= declaringTypeDeclaringType;
110             declaringTypeDeclaringType= declaringType.getDeclaringType();
111         }
112         return declaringType;
113     }
114 }
115
Popular Tags