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Java > Open Source Codes > com > jeantessier > dependency > LinkMinimizer


1 /*
2  * Copyright (c) 2001-2005, Jean Tessier
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * * Neither the name of Jean Tessier nor the names of his contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 package com.jeantessier.dependency;
34
35 import java.util.*;
36
37 public class LinkMinimizer extends VisitorBase {
38     public LinkMinimizer() {
39         super();
40
41         getStrategy().setPreOutboundTraversal(false);
42         getStrategy().setPreInboundTraversal(false);
43         getStrategy().setPostOutboundTraversal(false);
44         getStrategy().setPostInboundTraversal(false);
45     }
46
47     public LinkMinimizer(TraversalStrategy strategy) {
48         super(strategy);
49
50         getStrategy().setPreOutboundTraversal(false);
51         getStrategy().setPreInboundTraversal(false);
52         getStrategy().setPostOutboundTraversal(false);
53         getStrategy().setPostInboundTraversal(false);
54     }
55
56     protected void postprocessPackageNode(PackageNode node) {
57         traverseOutbound(node.getOutboundDependencies());
58
59         super.postprocessPackageNode(node);
60     }
61     
62     protected void postprocessClassNode(ClassNode node) {
63         Iterator i = getStrategy().order(node.getOutboundDependencies()).iterator();
64         while (i.hasNext()) {
65             Node outbound = (Node) i.next();
66
67             node.getPackageNode().removeDependency(outbound);
68
69             outbound.acceptOutbound(this);
70             
71             pushNode(node.getPackageNode());
72             outbound.acceptOutbound(this);
73             popNode();
74         }
75
76         super.postprocessClassNode(node);
77     }
78
79     public void visitOutboundClassNode(ClassNode node) {
80         getCurrentNode().removeDependency(node.getPackageNode());
81     }
82     
83     protected void postprocessFeatureNode(FeatureNode node) {
84         Iterator i = getStrategy().order(node.getOutboundDependencies()).iterator();
85         while (i.hasNext()) {
86             Node outbound = (Node) i.next();
87
88             node.getClassNode().removeDependency(outbound);
89             node.getClassNode().getPackageNode().removeDependency(outbound);
90
91             outbound.acceptOutbound(this);
92     
93             pushNode(node.getClassNode());
94             outbound.acceptOutbound(this);
95             popNode();
96     
97             pushNode(node.getClassNode().getPackageNode());
98             outbound.acceptOutbound(this);
99             popNode();
100         }
101
102         super.postprocessFeatureNode(node);
103     }
104
105     public void visitOutboundFeatureNode(FeatureNode node) {
106         getCurrentNode().removeDependency(node.getClassNode());
107         getCurrentNode().removeDependency(node.getClassNode().getPackageNode());
108     }
109 }
110
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