Source Code Cross Referenced for ExtensionPointItemCreator.java in  » GIS » udig-1.1 » net » refractions » udig » core » internal » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.core.internal 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         *    uDig - User Friendly Desktop Internet GIS client
03:         *    http://udig.refractions.net
04:         *    (C) 2004, Refractions Research Inc.
05:         *
06:         *    This library is free software; you can redistribute it and/or
07:         *    modify it under the terms of the GNU Lesser General Public
08:         *    License as published by the Free Software Foundation;
09:         *    version 2.1 of the License.
10:         *
11:         *    This library is distributed in the hope that it will be useful,
12:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14:         *    Lesser General Public License for more details.
15:         *
16:         */
17:        package net.refractions.udig.core.internal;
18:
19:        import java.util.List;
20:
21:        import org.eclipse.core.runtime.IConfigurationElement;
22:        import org.eclipse.core.runtime.IExtension;
23:
24:        /**
25:         * Process an Extention Point into items for a List.
26:         * <p>
27:         * This interface works with a different set of assumptions then Jesse's origional. It is influenced
28:         * by the guidelines in "Contributing to Eclipse", and is focused on Object (possibly proxy)
29:         * creation.
30:         * </p>
31:         * <p>
32:         * Assumptions:
33:         * <ul>
34:         * <li>Most of the time client code just wants to create an Object, or Proxy
35:         * <li>Good Fences Rule / Safe Platform Rule - processor makes sure to trap any exceptions, so a
36:         * single extention point cannot hinder others
37:         * <li>Conformance Rule - contributions must conform to expected interfaces, we can use Java 5
38:         * generics to force this point
39:         * <li>Is an abstract class allowing safe api extention in the future.
40:         * </ul>
41:         * </p>
42:         * <p>
43:         * Example Use:
44:         * 
45:         * <pre><code>
46:         *  List&lt;Thingy&gt; stuff = ExtentionPointUtil.list( new ExtentionPointProcessor2(){
47:         *     public Object process( IExtention extention, IConfigurationElement element ){
48:         *         return new Thingy( element );
49:         *     }
50:         *  }
51:         * </code></pre>
52:         * 
53:         * </p>
54:         * 
55:         * @author jgarnett
56:         * @since 0.6
57:         */
58:        public abstract class ExtensionPointItemCreator {
59:            /**
60:             * Process this extention point into a List.
61:             * 
62:             * @param xpid Extention point to process
63:             * @return List of items created
64:             */
65:            public List process(String xpid) {
66:                return ExtensionPointUtil.list(xpid, this );
67:            }
68:
69:            /**
70:             * Method called to create a List item from an extention point. This is a callback method for
71:             * the ExtensionPointUtil class.
72:             * 
73:             * @param extension An extension that extends the Extension point id specified in the
74:             *        ExtensionPointUtil.process() call.
75:             * @param element One of the configuration element of the extension. The process method is
76:             *        called once for each configuration element
77:             * @return Created Object (often a Proxy), throws an Exception if extention could not be
78:             *         processed returns true if this methods wants the ExtensionPointUtil#process() method
79:             *         to continue calling this method. false if no more calls need to be made.
80:             * @throws Exception If extention point could not be processed, a ExtentionPointUtil will create
81:             *         the appropriate log message
82:             */
83:            public abstract Object createItem(IExtension extension,
84:                    IConfigurationElement element) throws Exception;
85:
86:        }
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