KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > vladium > emma > ant > GenericCfg


1 /* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
2  *
3  * This program and the accompanying materials are made available under
4  * the terms of the Common Public License v1.0 which accompanies this distribution,
5  * and is available at http://www.eclipse.org/legal/cpl-v10.html
6  *
7  * $Id: GenericCfg.java,v 1.1.1.1.2.1 2004/07/08 10:52:10 vlad_r Exp $
8  */
9 package com.vladium.emma.ant;
10
11 import java.io.File JavaDoc;
12 import java.io.IOException JavaDoc;
13 import java.util.ArrayList JavaDoc;
14 import java.util.Iterator JavaDoc;
15 import java.util.List JavaDoc;
16 import java.util.Properties JavaDoc;
17
18 import org.apache.tools.ant.BuildException;
19 import org.apache.tools.ant.Task;
20
21 import com.vladium.emma.EMMAProperties;
22 import com.vladium.util.IProperties;
23 import com.vladium.util.Property;
24
25 // ----------------------------------------------------------------------------
26 /**
27  * GenericCfg is a simple container for 'generic' properties, i.e., properties
28  * that are set via generic 'properties=<file>' attribute and <property>
29  * nested elements. This class makes no decision about relative priorities for
30  * propertie set in an external file or via nested elements, leaving this up
31  * to the parent.
32  *
33  * @author Vlad Roubtsov, (C) 2003
34  */
35 public
36 class GenericCfg
37 {
38     // public: ................................................................
39
40
41     public GenericCfg (final Task task)
42     {
43         if (task == null) throw new IllegalArgumentException JavaDoc ("null input: task");
44         
45         m_task = task;
46         m_genericPropertyElements = new ArrayList JavaDoc ();
47     }
48     
49
50     // .properties file attribute [actual file I/O done lazily by getFileSettings()]:
51
52     public void setProperties (final File JavaDoc file)
53     {
54         m_settingsFile = file; // actual file I/O is done in getFileSettings()
55 }
56
57     // generic property element:
58
59     public PropertyElement createProperty ()
60     {
61         m_genericSettings = null;
62         
63         final PropertyElement property = new PropertyElement ();
64         m_genericPropertyElements.add (property);
65         
66         return property;
67     }
68
69     // ACCESSORS:
70
71     public IProperties getFileSettings ()
72     {
73         IProperties fileSettings = m_fileSettings;
74         if ((fileSettings == null) && (m_settingsFile != null))
75         {
76             try
77             {
78                 fileSettings = EMMAProperties.wrap (Property.getPropertiesFromFile (m_settingsFile));
79             }
80             catch (IOException JavaDoc ioe)
81             {
82                 throw (BuildException) SuppressableTask.newBuildException (m_task.getTaskName ()
83                     + ": property file [" + m_settingsFile.getAbsolutePath () + "] could not be read" , ioe, m_task.getLocation ()).fillInStackTrace ();
84             }
85             
86             m_fileSettings = fileSettings;
87             
88             return fileSettings;
89         }
90         
91         return fileSettings;
92     }
93     
94     public IProperties getGenericSettings ()
95     {
96         IProperties genericSettings = m_genericSettings;
97         if (genericSettings == null)
98         {
99             genericSettings = EMMAProperties.wrap (new Properties JavaDoc ());
100             
101             for (Iterator JavaDoc i = m_genericPropertyElements.iterator (); i.hasNext (); )
102             {
103                 final PropertyElement property = (PropertyElement) i.next ();
104                 
105                 final String JavaDoc name = property.getName ();
106                 String JavaDoc value = property.getValue ();
107                 if (value == null) value = "";
108                 
109                 if (name != null)
110                 {
111                     // [assertion: name != null, value != null]
112
113                     final String JavaDoc currentValue = genericSettings.getProperty (name);
114                     if ((currentValue != null) && ! value.equals (currentValue))
115                     {
116                         throw (BuildException) SuppressableTask.newBuildException (m_task.getTaskName ()
117                             + ": conflicting settings for property [" + name + "]: [" + value + "]" , m_task.getLocation ()).fillInStackTrace ();
118                     }
119                     else
120                     {
121                         genericSettings.setProperty (name, value);
122                     }
123                 }
124             }
125             
126             m_genericSettings = genericSettings;
127             
128             return genericSettings;
129         }
130         
131         return genericSettings;
132     }
133     
134     // protected: .............................................................
135
136     // package: ...............................................................
137
138     // private: ...............................................................
139
140     
141     private final Task m_task;
142         
143     private final List JavaDoc /* PropertyElement */ m_genericPropertyElements; // never null
144 private File JavaDoc m_settingsFile; // can be null
145
146     private transient IProperties m_fileSettings; // can be null
147 private transient IProperties m_genericSettings; // can be null
148
149 } // end of class
150 // ----------------------------------------------------------------------------
Popular Tags