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Java > Open Source Codes > com > google > inject > util > StackTraceElements


1 /**
2  * Copyright (C) 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */

16
17 package com.google.inject.util;
18
19 import com.google.inject.spi.SourceProviders;
20 import static com.google.inject.util.ReferenceType.SOFT;
21 import static com.google.inject.util.ReferenceType.WEAK;
22 import java.io.IOException JavaDoc;
23 import java.lang.reflect.Constructor JavaDoc;
24 import java.lang.reflect.Member JavaDoc;
25 import java.util.Map JavaDoc;
26
27 /**
28  * Creates stack trace elements for members.
29  *
30  * @author crazybob@google.com (Bob Lee)
31  */

32 public class StackTraceElements {
33
34   static final Map JavaDoc<Class JavaDoc<?>, LineNumbers> lineNumbersCache
35       = new ReferenceCache<Class JavaDoc<?>, LineNumbers>(WEAK, SOFT) {
36     protected LineNumbers create(Class JavaDoc<?> key) {
37       try {
38         return new LineNumbers(key);
39       }
40       catch (IOException JavaDoc e) {
41         throw new RuntimeException JavaDoc(e);
42       }
43     }
44   };
45
46   public static Object JavaDoc forMember(Member JavaDoc member) {
47     if (member == null) {
48       return SourceProviders.UNKNOWN_SOURCE;
49     }
50
51     Class JavaDoc declaringClass = member.getDeclaringClass();
52     LineNumbers lineNumbers = lineNumbersCache.get(declaringClass);
53     Integer JavaDoc lineNumber = lineNumbers.getLineNumber(member);
54     String JavaDoc memberName
55         = member instanceof Constructor JavaDoc ? "<init>" : member.getName();
56     StackTraceElement JavaDoc element = new StackTraceElement JavaDoc(
57       declaringClass.getName(), memberName, lineNumbers.getSource(),
58         lineNumber == null ? lineNumbers.getFirstLine() : lineNumber);
59     return element;
60   }
61
62   public static Object JavaDoc forType(Class JavaDoc<?> implementation) {
63     LineNumbers lineNumbers = lineNumbersCache.get(implementation);
64     return new StackTraceElement JavaDoc(
65         implementation.getName(),
66         "class",
67         lineNumbers.getSource(),
68         lineNumbers.getFirstLine());
69   }
70 }
71
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