CallLocation


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    *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation
10   *          (report 36180: Callers/Callees view)
11   *******************************************************************************/
12  package org.eclipse.jdt.internal.corext.callhierarchy;
13  
14  import org.eclipse.core.runtime.IAdaptable;
15  
16  import org.eclipse.jdt.core.IBuffer;
17  import org.eclipse.jdt.core.IJavaElement;
18  import org.eclipse.jdt.core.IMember;
19  import org.eclipse.jdt.core.IOpenable;
20  import org.eclipse.jdt.core.JavaModelException;
21  
22  import org.eclipse.jface.text.BadLocationException;
23  import org.eclipse.jface.text.Document;
24  
25  import org.eclipse.jdt.internal.ui.JavaPlugin;
26  
27  public class CallLocation implements IAdaptable {
28      public static final int UNKNOWN_LINE_NUMBER= -1;
29      private IMember fMember;
30      private IMember fCalledMember;
31      private int fStart;
32      private int fEnd;
33  
34      private String   fCallText;
35      private int fLineNumber;
36  
37      public CallLocation(IMember member, IMember calledMember, int start, int end, int lineNumber) {
38          this.fMember = member;
39          this.fCalledMember = calledMember;
40          this.fStart = start;
41          this.fEnd = end;
42          this.fLineNumber= lineNumber;
43      }
44  
45      /**
46       * @return IMethod
47       */
48      public IMember getCalledMember() {
49          return fCalledMember;
50      }
51  
52      /**
53       *
54       */
55      public int getEnd() {
56          return fEnd;
57      }
58  
59      public IMember getMember() {
60          return fMember;
61      }
62  
63      /**
64       *
65       */
66      public int getStart() {
67          return fStart;
68      }
69  
70      public int getLineNumber() {
71          initCallTextAndLineNumber();
72          return fLineNumber;
73      }
74      
75      public String   getCallText() {
76          initCallTextAndLineNumber();
77          return fCallText;
78      }
79  
80      private void initCallTextAndLineNumber() {
81          if (fCallText != null)
82              return;
83          
84          IBuffer buffer= getBufferForMember();
85          if (buffer == null || buffer.getLength() < fEnd) { //binary, without source attachment || buffer contents out of sync (bug 121900)
86              fCallText= ""; //$NON-NLS-1$
87              fLineNumber= UNKNOWN_LINE_NUMBER;
88              return;
89          }
90  
91          fCallText= buffer.getText(fStart, (fEnd - fStart));
92          
93          if (fLineNumber == UNKNOWN_LINE_NUMBER) {
94              Document document= new Document(buffer.getContents());
95              try {
96                  fLineNumber= document.getLineOfOffset(fStart) + 1;
97              } catch (BadLocationException e) {
98                  JavaPlugin.log(e);
99              }
100         }
101     }
102     
103     /**
104      * Returns the IBuffer for the IMember represented by this CallLocation.
105      * 
106      * @return IBuffer for the IMember or null if the member doesn't have a buffer (for
107      *          example if it is a binary file without source attachment).
108      */
109     private IBuffer getBufferForMember() {
110         IBuffer buffer = null;
111         try {
112             IOpenable openable = fMember.getOpenable();
113             if (openable != null && fMember.exists()) {
114                 buffer = openable.getBuffer();
115             }
116         } catch (JavaModelException e) {
117             JavaPlugin.log(e);
118         }
119         return buffer;
120     }
121 
122     public String   toString() {
123         return getCallText();
124     }
125     
126     public Object   getAdapter(Class   adapter) {
127         if (IJavaElement.class.isAssignableFrom(adapter)) {
128             return getMember();
129         }
130 
131         return null;
132     }
133 }
134
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