Bug 120598 Refactoring History JAR Export Wizard should allow (de-)selecting refactorings
I20051213-0010 It is currently not possible to deselect single refactorings from the history during the export of a JAR - only refactorings before a certain date can be excluded. I'd suggest adding the possibility of selecting/deselecting refactorings.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/jarpackager/JarPackageData.java
*/
	public IJarDescriptionReader createJarDescriptionReader(InputStream inputStream) {
		return new JarPackageReader(inputStream);
	}
	
	/**
	 * Tells whether this JAR package data can be used to generate
	 * a valid JAR.
	 * 
	 * @return <code>true</code> if the JAR Package info is valid
	 */
	public boolean isValid() {
		return (areGeneratedFilesExported() || areJavaFilesExported())
			&& getElements() != null && getElements().length > 0
			&& getAbsoluteJarLocation() != null
			&& isManifestAccessible()
			&& isMainClassValid(new BusyIndicatorRunnableContext());
	}
	/**
	 * Tells whether a manifest is available.
	 * 
	 * @return <code>true</code> if the manifest is generated or the provided one is accessible
	 */
	public boolean isManifestAccessible() {
		if (isManifestGenerated())
			return true;
		IFile file= getManifestFile();
		return file != null && file.isAccessible();
	}
	/**