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org.apache.commons.jelly.task.AntJellyContext	0%	0%

1		/*
2		* Copyright 2002,2004 The Apache Software Foundation.
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 org.apache.commons.jelly.task;
18
19		import java.util.HashMap;
20		import java.util.Iterator;
21		import java.util.Map;
22
23		import org.apache.commons.jelly.JellyContext;
24		import org.apache.commons.logging.Log;
25		import org.apache.commons.logging.LogFactory;
26		import org.apache.tools.ant.Project;
27
28		/** <p><code>AntJellyContext</code> represents the Jelly context from inside Ant.</p>
29		*
30		* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
31		* @version $Revision: 155420 $
32		*/
33
34		public class AntJellyContext extends JellyContext {
35
36		/** The Ant project which contains the variables */
37		private Project project;
38
39		/** The Log to which logging calls will be made. */
40	0	private Log log = LogFactory.getLog(AntJellyContext.class);
41
42		public AntJellyContext(Project project, JellyContext parentJellyContext) {
43	0	super( parentJellyContext );
44	0	this.project = project;
45	0	}
46
47		/** @return the value of the given variable name */
48		public Object getVariable(String name) {
49		// look in parent first
50	0	Object answer = super.getVariable(name);
51	0	if (answer == null) {
52	0	answer = project.getProperty(name);
53		}
54
55	0	if ( log.isDebugEnabled() ) {
56	0	log.debug( "Looking up variable: " + name + " answer: " + answer );
57		}
58
59	0	return answer;
60		}
61
62		/** Sets the value of the given variable name */
63		public void setVariable(String name, Object value) {
64	0	if ( log.isDebugEnabled() ) {
65	0	log.debug( "Setting variable: " + name + " to: " + value );
66		}
67
68	0	super.setVariable( name, value );
69
70		// only export string values back to Ant?
71	0	if ( value instanceof String ) {
72	0	project.setProperty(name, (String) value);
73		}
74	0	}
75
76		/** Removes the given variable */
77		public void removeVariable(String name) {
78	0	super.removeVariable( name );
79	0	project.setProperty(name, null);
80	0	}
81
82		/**
83		* @return an Iterator over the current variable names in this
84		* context
85		*/
86		public Iterator getVariableNames() {
87	0	return getVariables().keySet().iterator();
88		}
89
90		/**
91		* @return the Map of variables in this scope
92		*/
93		public Map getVariables() {
94		// we should add all the Project's properties
95	0	Map map = new HashMap( project.getProperties() );
96
97		// override any local properties
98	0	map.putAll( super.getVariables() );
99	0	return map;
100		}
101
102		/**
103		* Sets the Map of variables to use
104		*/
105
106		public void setVariables(Map variables) {
107	0	super.setVariables(variables);
108
109		// export any Ant properties
110	0	for ( Iterator iter = variables.entrySet().iterator(); iter.hasNext(); ) {
111	0	Map.Entry entry = (Map.Entry) iter.next();
112	0	String key = (String) entry.getKey();
113	0	Object value = entry.getValue();
114	0	if ( value instanceof String ) {
115	0	project.setProperty(key, (String)value);
116		}
117		}
118	0	}
119
120
121		// Implementation methods
122		//-------------------------------------------------------------------------
123
124		/**
125		* Factory method to create a new child of this context
126		*/
127		protected JellyContext createChildContext() {
128	0	return new AntJellyContext(project, this);
129		}
130
131		}

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