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87 package org.codehaus.loom.components.extensions.pkgmgr.impl;
88
89 import java.util.Comparator  ;
90
91 import org.codehaus.loom.components.extensions.pkgmgr.OptionalPackage;
92 import org.codehaus.loom.extension.DeweyDecimal;
93 import org.codehaus.loom.extension.Extension;
94
95
103 class OptionalPackageComparator
104 implements Comparator
105 {
106
107 private final String m_name;
108
109 public OptionalPackageComparator( final String name )
110 {
111 if( null == name )
112 {
113 throw new NullPointerException ( "name" );
114 }
115
116 m_name = name;
117 }
118
119 public int compare( final Object o1,
120 final Object o2 )
121 {
122 final OptionalPackage pkg1 = (OptionalPackage)o1;
123 final OptionalPackage pkg2 = (OptionalPackage)o2;
124 final Extension e1 = getMatchingExtension( pkg1 );
125 final Extension e2 = getMatchingExtension( pkg2 );
126 int result = compareSpecVersion( e1, e2 );
127 if( 0 != result )
128 {
129 return result;
130 }
131 else
132 {
133 return compareImplVersion( e1, e2 );
134 }
135 }
136
137 private Extension getMatchingExtension( final OptionalPackage pkg )
138 {
139 final Extension[] extensions = pkg.getAvailableExtensions();
140 for( int i = 0; i < extensions.length; i++ )
141 {
142 final Extension extension = extensions[ i ];
143 if( extension.getExtensionName().equals( m_name ) )
144 {
145 return extension;
146 }
147 }
148
149 final String message = "Unable to locate extension " +
150 m_name + " in package " + pkg;
151 throw new IllegalStateException ( message );
152 }
153
154 private int compareImplVersion( final Extension e1, final Extension e2 )
155 {
156 final String implVersion1 = e1.getImplementationVersion();
157 final String implVersion2 = e2.getImplementationVersion();
158 if( null == implVersion1 && null == implVersion2 )
159 {
160 return 0;
161 }
162 else if( null != implVersion1 && null == implVersion2 )
163 {
164 return -1;
165 }
166 else if( null == implVersion1 && null != implVersion2 )
167 {
168 return 1;
169 }
170 else
171 {
172 return -implVersion1.compareTo( implVersion2 );
173 }
174 }
175
176 private int compareSpecVersion( final Extension e1,
177 final Extension e2 )
178 {
179 final DeweyDecimal specVersion1 = e1.getSpecificationVersion();
180 final DeweyDecimal specVersion2 = e2.getSpecificationVersion();
181 if( null == specVersion1 && null == specVersion2 )
182 {
183 return 0;
184 }
185 else if( null != specVersion1 && null == specVersion2 )
186 {
187 return -1;
188 }
189 else if( null == specVersion1 && null != specVersion2 )
190 {
191 return 1;
192 }
193 else
194 {
195 if( specVersion1.isEqual( specVersion2 ) )
196 {
197 return 0;
198 }
199 else if( specVersion1.isGreaterThan( specVersion2 ) )
200 {
201 return -1;
202 }
203 else
204 {
205 return 1;
206 }
207 }
208 }
209 }
210 |
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