Source Code Cross Referenced for ExtensionInfo.java in  » 6.0-JDK-Modules » j2me » sun » misc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » sun.misc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)ExtensionInfo.java	1.11 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package sun.misc;
029:
030:        import java.util.StringTokenizer;
031:        import java.util.jar.Attributes;
032:        import java.util.jar.Attributes.Name;
033:
034:        /**
035:         * This class holds all necessary information to install or
036:         * upgrade a extension on the user's disk
037:         *
038:         * @author  Jerome Dochez
039:         * @version 1.5, 02/02/00
040:         */
041:        public class ExtensionInfo {
042:
043:            /**
044:             * <p>
045:             * public static values returned by the isCompatible method
046:             * </p>
047:             */
048:            public static final int COMPATIBLE = 0;
049:            public static final int REQUIRE_SPECIFICATION_UPGRADE = 1;
050:            public static final int REQUIRE_IMPLEMENTATION_UPGRADE = 2;
051:            public static final int REQUIRE_VENDOR_SWITCH = 3;
052:            public static final int INCOMPATIBLE = 4;
053:
054:            /**
055:             * <p>
056:             * attributes fully describer an extension. The underlying described 
057:             * extension may be installed and requested.
058:             * <p>
059:             */
060:            public String title;
061:            public String name;
062:            public String specVersion;
063:            public String specVendor;
064:            public String implementationVersion;
065:            public String vendor;
066:            public String vendorId;
067:            public String url;
068:
069:            /**
070:             * <p>
071:             * Create a new unintialized extension information object
072:             * </p>
073:             */
074:            public ExtensionInfo() {
075:            }
076:
077:            /**
078:             * <p>
079:             * Create and initialize an extension information object.
080:             * The initialization uses the attributes passed as being
081:             * the content of a manifest file to load the extension
082:             * information from.
083:             * Since manifest file may contain information on several
084:             * extension they may depend on, the extension key parameter
085:             * is prepanded to the attribute name to make the key used
086:             * to retrieve the attribute from the manifest file
087:             * <p>
088:             * @param extensionKey unique extension key in the manifest
089:             * @param attr Attributes of a manifest file
090:             */
091:            public ExtensionInfo(String extensionKey, Attributes attr)
092:                    throws NullPointerException {
093:                String s;
094:                if (extensionKey != null) {
095:                    s = extensionKey + "-";
096:                } else {
097:                    s = "";
098:                }
099:                String attrKey = s + Name.EXTENSION_NAME.toString();
100:                name = attr.getValue(attrKey);
101:                attrKey = s + Name.SPECIFICATION_TITLE.toString();
102:                title = attr.getValue(attrKey);
103:                attrKey = s + Name.SPECIFICATION_VERSION.toString();
104:                specVersion = attr.getValue(attrKey);
105:                attrKey = s + Name.SPECIFICATION_VERSION.toString();
106:                specVersion = attr.getValue(attrKey);
107:                attrKey = s + Name.IMPLEMENTATION_VERSION.toString();
108:                implementationVersion = attr.getValue(attrKey);
109:                attrKey = s + Name.IMPLEMENTATION_VENDOR.toString();
110:                vendor = attr.getValue(attrKey);
111:                attrKey = s + Name.IMPLEMENTATION_VENDOR_ID.toString();
112:                vendorId = attr.getValue(attrKey);
113:                attrKey = s + Name.IMPLEMENTATION_URL.toString();
114:                url = attr.getValue(attrKey);
115:            }
116:
117:            /**
118:             * <p>
119:             * @return true if the extension described by this extension information
120:             * is compatible with the extension described by the extension 
121:             * information passed as a parameter
122:             * </p>
123:             *
124:             * @param the requested extension information to compare to
125:             */
126:            public int isCompatibleWith(ExtensionInfo ei) {
127:
128:                if (name == null || ei.name == null)
129:                    return INCOMPATIBLE;
130:                if (name.compareTo(ei.name) == 0) {
131:                    System.out.println("Potential match");
132:
133:                    // is this true, if not spec version is specified, we consider 
134:                    // the value as being "any".
135:                    if (specVersion == null || ei.specVersion == null)
136:                        return COMPATIBLE;
137:
138:                    int version = compareExtensionVersion(specVersion,
139:                            ei.specVersion);
140:                    if (version < 0) {
141:                        // this extension specification is "older"
142:                        if (vendorId != null && ei.vendorId != null) {
143:                            if (vendorId.compareTo(ei.vendorId) != 0) {
144:                                return REQUIRE_VENDOR_SWITCH;
145:                            }
146:                        }
147:                        return REQUIRE_SPECIFICATION_UPGRADE;
148:                    } else {
149:                        // the extension spec is compatible, let's look at the 
150:                        // implementation attributes
151:                        if (vendorId != null && ei.vendorId != null) {
152:                            // They care who provides the extension
153:                            if (vendorId.compareTo(ei.vendorId) != 0) {
154:                                // They want to use another vendor implementation
155:                                return REQUIRE_VENDOR_SWITCH;
156:                            } else {
157:                                // Vendor matches, let's see the implementation version
158:                                if (implementationVersion != null
159:                                        && ei.implementationVersion != null) {
160:                                    // they care about the implementation version 
161:                                    version = compareExtensionVersion(
162:                                            implementationVersion,
163:                                            ei.implementationVersion);
164:                                    if (version < 0) {
165:                                        // This extension is an older implementation
166:                                        return REQUIRE_IMPLEMENTATION_UPGRADE;
167:                                    }
168:                                }
169:                            }
170:                        }
171:                        // All othe cases, we consider the extensions to be compatible
172:                        return COMPATIBLE;
173:                    }
174:                }
175:                return INCOMPATIBLE;
176:            }
177:
178:            /**
179:             * <p>
180:             * helper method to print sensible information on the undelying described 
181:             * extension
182:             * </p>
183:             */
184:            public String toString() {
185:                return "Extension : " + title + "(" + name + "), spec version("
186:                        + specVersion + "), impl version("
187:                        + implementationVersion + ") from " + vendor + "("
188:                        + vendorId + ")";
189:            }
190:
191:            /*
192:             * <p>
193:             * helper method to compare two versions. 
194:             * version are in the x.y.z.t pattern.
195:             * </p>
196:             * @param source version to compare to
197:             * @param target version used to compare against
198:             * @return < 0 if source < version
199:             *         > 0 if source > version
200:             *         = 0 if source = version
201:             */
202:            private int compareExtensionVersion(String source, String target)
203:                    throws NumberFormatException {
204:                StringTokenizer stk = new StringTokenizer(source, ".,");
205:                StringTokenizer ttk = new StringTokenizer(target, ".,");
206:
207:                while (stk.hasMoreTokens() || ttk.hasMoreTokens()) {
208:                    int sver, tver;
209:
210:                    if (stk.hasMoreTokens())
211:                        sver = Integer.parseInt(stk.nextToken());
212:                    else
213:                        sver = 0;
214:
215:                    if (ttk.hasMoreTokens())
216:                        tver = Integer.parseInt(ttk.nextToken());
217:                    else
218:                        tver = 0;
219:
220:                    if (sver < tver)
221:                        return -1;
222:                    if (sver > tver)
223:                        return 1;
224:                    // equality, continue with the next version number
225:                }
226:                // complete equality
227:                return 0;
228:            }
229:
230:        }
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