plugins/org.eclipse.epp.installer.core.win32/src/org/eclipse/epp/installer/internal/win32/core/operations/CleanupWin32RegistryOperation.java

package org.eclipse.epp.installer.internal.win32.core.operations;

import java.io.File;
import java.util.Enumeration;

import org.eclipse.epp.installer.core.model.ISequence;
import org.eclipse.epp.installer.core.model.ISingleton;
import org.eclipse.epp.installer.core.operations.CleanupRegisteredProductsOperation;
import org.eclipse.epp.installer.internal.core.operations.ProxyOperation;
import org.eclipse.epp.installer.internal.core.operations.StubOperation;

import com.ice.jni.registry.Registry;
import com.ice.jni.registry.RegistryException;
import com.ice.jni.registry.RegistryKey;

public class CleanupWin32RegistryOperation extends StubOperation implements
		ISequence, ISingleton {

	private static String uninstallKeyString = "UninstallString";

	private static String installLocation = "InstallLocation";

	public CleanupWin32RegistryOperation(ProxyOperation operation) {
		super(operation);
	}

	/**
	 * Add needed sub oprtations to set of Prerequisites.
	 * 
	 * @throws Exception
	 */
	public void prepare() throws Exception {
		String uninstallJarName = ((CleanupRegisteredProductsOperation) this
				.getProxyOperation()).getUninstallJarName();

		String rootKeyPath = Win32RegisterProductOperation.REGISTRY_UNINSTALL_KEY;
		try {
			RegistryKey key = Registry.openSubkey(Registry.HKEY_LOCAL_MACHINE,
					rootKeyPath, RegistryKey.ACCESS_READ);

			for (Enumeration e = key.keyElements(); e.hasMoreElements();) {
				String subKeyName = (String) e.nextElement();

				try {
					RegistryKey subKey = key.openSubKey(subKeyName);

					String uninstallString = subKey
							.getStringValue(uninstallKeyString);
					int ind = uninstallString.indexOf(uninstallJarName);
					if (ind != -1) {
						File uninstaller = new File(uninstallString.substring(
								uninstallString.indexOf(":") - 1, ind)
								+ uninstallJarName);
						if (!uninstaller.exists()) {

							// System.out.println("Bad add/remove entry :"
							// + uninstaller.getAbsolutePath());
							// System.out.println("key name " + subKeyName);
							add(new RemoveRegistryKeyOperation(rootKeyPath,
									subKeyName));
						}
					}
					subKey.closeKey();
				} catch (RegistryException e1) {
				}

			}
			key.closeKey();
		} catch (RegistryException e) {
		}

	}

}