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1
56 package org.objectstyle.cayenne.project;
57
58 import java.util.Collection  ;
59
60 import org.objectstyle.cayenne.conf.Configuration;
61
62
66 abstract class ApplicationUpgradeHandler {
67 private static final ApplicationUpgradeHandler sharedInstance =
68 new UpgradeHandler_1_1();
69
70 static ApplicationUpgradeHandler sharedHandler() {
71 return sharedInstance;
72 }
73
74 abstract String supportedVersion();
75
76 abstract boolean checkForUpgrades(Configuration project, Collection appendMessages);
77
78 abstract void performUpgrade(ApplicationProject project) throws ProjectException;
79
80 int compareVersion(String version) {
81 double supported = decodeVersion(supportedVersion());
82 double newVersion = decodeVersion(version);
83 return supported < newVersion ? -1 : (supported == newVersion) ? 0 : 1;
84 }
85
86 static double decodeVersion(String version) {
87 if (version == null || version.trim().length() == 0) {
88 return 0;
89 }
90
91 StringBuffer buffer = new StringBuffer (version.length());
94 boolean dotProcessed = false;
95 for (int i = 0; i < version.length(); i++) {
96 char nextChar = version.charAt(i);
97 if (nextChar == '.' && !dotProcessed) {
98 dotProcessed = true;
99 buffer.append('.');
100 }
101 else if (Character.isDigit(nextChar)) {
102 buffer.append(nextChar);
103 }
104 }
105
106 return Double.parseDouble(buffer.toString());
107 }
108
109 static class UpgradeHandler_1_1 extends ApplicationUpgradeHandler {
110 String supportedVersion() {
111 return "1.1";
112 }
113
114 void performUpgrade(ApplicationProject project) throws ProjectException {
115 project.setModified(true);
116 project.getConfiguration().setProjectVersion(supportedVersion());
117 project.save();
118 }
119
120 boolean checkForUpgrades(Configuration project, Collection appendMessages) {
121 String loadedVersion = project.getProjectVersion();
122 int versionState = compareVersion(loadedVersion);
123 if (versionState < 0) {
124 String versionLabel = (loadedVersion != null) ? loadedVersion : "?";
125 appendMessages.add(
126 "Newer Project Version Detected: \"" + versionLabel + "\"");
127 return true;
128 }
129 else if (versionState > 0) {
130 String versionLabel = (loadedVersion != null) ? loadedVersion : "?";
131 appendMessages.add(
132 "Older Project Version Detected: \"" + versionLabel + "\"");
133 return true;
134 }
135 else {
136 return false;
137 }
138 }
139 }
140 }
141 |
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