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| <TITLE>Comparing launch configurations</TITLE> |
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| <h4>Comparing launch configurations</h4> |
| <p>We've seen how a plug-in can use named attributes and values to store important data with a |
| launch configuration. Since the interpretation of a plug-in's attributes are not known by the platform, |
| an extension point is provided that allows you to supply a comparator for a specific attribute. |
| This comparator is used to determine whether attributes of the specified name are |
| equal. In many cases, the simple string compare provided by |
| java.lang.Object.equals(Object) is suitable for comparing attributes. This |
| technique will be used if no comparator has been provided. However, some attribute values |
| may require special handling, such as stripping white space values from text |
| before comparing for equality. </p> |
| <p>Comparators are contributed using the <a href="../reference/extension-points/org_eclipse_debug_core_launchConfigurationComparators.html"><b>org.eclipse.debug.core.launchConfigurationComparators</b></a> |
| extension point. </p> |
| <p>The Java tools supply launch configuration comparators for comparing program |
| source paths and class paths.</p> |
| <pre><extension point = "org.eclipse.debug.core.launchConfigurationComparators"> |
| <launchConfigurationComparator |
| id = "org.eclipse.jdt.launching.classpathComparator" |
| class = "org.eclipse.jdt.internal.launching.RuntimeClasspathEntryListComparator" |
| attribute = "org.eclipse.jdt.launching.CLASSPATH"/> |
| <launchConfigurationComparator |
| id = "org.eclipse.jdt.launching.sourcepathComparator" |
| class = "org.eclipse.jdt.internal.launching.RuntimeClasspathEntryListComparator" |
| attribute = "org.eclipse.jdt.launching.SOURCE_PATH"/> |
| </extension></pre> |
| <p>Comparators must implement the interface <b>java.util.Comparator</b>.</p> |
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