bundles/org.eclipse.wst.sse.ui/src/org/eclipse/wst/sse/ui/internal/TransferBuilder.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2001, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Jens Lukowski/Innoopract - initial renaming/restructuring
  *
  *******************************************************************************/
 package org.eclipse.wst.sse.ui.internal;


 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.core.runtime.IExtensionRegistry;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.swt.custom.BusyIndicator;
 import org.eclipse.swt.dnd.Transfer;
 import org.eclipse.wst.sse.ui.internal.extension.DropActionProxy;
 import org.eclipse.wst.sse.ui.internal.extension.RegistryReader;
 import org.osgi.framework.Bundle;


 /**
  * Builds drop target transfers, drag source transfers, and drop actions
  */
 public class TransferBuilder extends RegistryReader {

 	public static final String ATT_CLASS = "class"; //$NON-NLS-1$
 	public static final String ATT_ID = "id"; //$NON-NLS-1$
 	public static final String ATT_METHOD = "method"; //$NON-NLS-1$
 	public static final String ATT_PRIORITY = "priority"; //$NON-NLS-1$
 	public static final String ATT_SINGLETON = "singleton"; //$NON-NLS-1$
 	public static final String ATT_TARGET_ID = "targetID"; //$NON-NLS-1$
 	public static final String ATT_TRANSFER_ID = "transferID"; //$NON-NLS-1$

 	private final static boolean debugTime = "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.wst.sse.ui/transferbuilder/time")); //$NON-NLS-1$  //$NON-NLS-2$

 	public static final String PL_DRAG_SOURCE_TRANSFERS = "dragSourceTransfers"; //$NON-NLS-1$
 	public static final String PL_DROP_TARGET_TRANSFERS = "dropTargetTransfers"; //$NON-NLS-1$

 	public static final String PLUGIN_ID = "org.eclipse.wst.sse.ui"; //$NON-NLS-1$

 	public static final String[] PRIORITIES = {"highest", "high", "mid", "low", "lowest"}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$

 	public static final String TAG_DRAG_SOURCE_CONTRIBUTION = "dragSourceContribution"; //$NON-NLS-1$
 	public static final String TAG_DROP_ACTION = "dropAction"; //$NON-NLS-1$
 	public static final String TAG_DROP_TARGET_CONTRIBUTION = "dropTargetContribution"; //$NON-NLS-1$

 	public static final String TAG_TRANSFER = "transfer"; //$NON-NLS-1$

 	public static final String TRUE = "true"; //$NON-NLS-1$

 	/**
 	 * @param element
 	 * @param classAttribute
 	 * @return Object
 	 * @throws CoreException
 	 */
 	static Object createExecutableExtension(final IConfigurationElement element, final String classAttribute) throws CoreException {

 		Object obj = null;

 		String singleton = element.getAttribute(ATT_SINGLETON);
 		String method = element.getAttribute(ATT_METHOD);
 		if (TRUE.equalsIgnoreCase(singleton) && method != null) {
 			try {
 				String name = element.getAttribute(ATT_CLASS);
 				String pluginId = element.getDeclaringExtension().getNamespace();
 				Class cls = Platform.getBundle(pluginId).loadClass(name);
 				Method mtd = cls.getMethod(method, new Class[]{});

 				obj = mtd.invoke(null, null);
 			} catch (ClassNotFoundException e) {
 				obj = null;
 			} catch (NoSuchMethodException e) {
 				obj = null;
 			} catch (IllegalAccessException e) {
 				obj = null;
 			} catch (InvocationTargetException e) {
 				obj = null;
 			}
 		} else {
 			obj = element.createExecutableExtension(classAttribute);
 		}

 		return obj;
 	}

 	/**
 	 * Creates an extension. If the extension plugin has not been loaded a
 	 * busy cursor will be activated during the duration of the load.
 	 *
 	 * @param element
 	 * @param classAttribute
 	 * @return Object
 	 * @throws CoreException
 	 */
 	public static Object createExtension(final IConfigurationElement element, final String classAttribute) {
 		// If plugin has been loaded create extension.
 		// Otherwise, show busy cursor then create extension.
 		final Object[] result = new Object[1];
 		String pluginId = element.getDeclaringExtension().getNamespace();
 		Bundle bundle = Platform.getBundle(pluginId);
 		if (bundle.getState() == Bundle.ACTIVE) {
 			try {
 				return createExecutableExtension(element, classAttribute);
 			} catch (CoreException e) {
 				handleCreateExecutableException(result, e);
 			}
 		} else {
 			BusyIndicator.showWhile(null, new Runnable() {
 				public void run() {
 					try {
 						result[0] = createExecutableExtension(element, classAttribute);
 					} catch (Exception e) {
 						handleCreateExecutableException(result, e);
 					}
 				}
 			});
 		}
 		return result[0];
 	}

 	/**
 	 * @param result
 	 * @param e
 	 */
 	protected static void handleCreateExecutableException(Object[] result, Throwable e) {
 		Logger.logException(e);
 		result[0] = null;

 	}

 	protected List cache;
 	protected String targetContributionTag;

 	protected List targetIDs;

 	/**
 	 * @param element
 	 * @return IDropAction
 	 */
 	protected IDropAction createDropAction(IConfigurationElement element) {
 		Object obj = null;
 		obj = createExtension(element, ATT_CLASS);
 		if (obj == null)
 			return null;
 		return (obj instanceof IDropAction) ? (IDropAction) DropActionProxy.newInstance(obj) : null;
 	}

 	/**
 	 * @param transferId
 	 * @return IDropAction[]
 	 */
 	protected IDropAction[] createDropActions(String transferId) {
 		if (cache == null)
 			return new IDropAction[0];

 		final int num = cache.size();
 		if (num == 0)
 			return new IDropAction[0];

 		IDropAction[] as = new IDropAction[num];
 		int j = 0;
 		for (int p = 0; p < PRIORITIES.length; p++) {
 			for (int i = 0; i < num; i++) {
 				Object obj = cache.get(i);
 				if (!(obj instanceof IConfigurationElement))
 					continue;

 				IConfigurationElement element = (IConfigurationElement) obj;
 				if (!(TAG_DROP_ACTION.equals(element.getName())) || !(transferId.equals(element.getAttribute(ATT_TRANSFER_ID))))
 					continue;

 				if (PRIORITIES[p].equals(element.getAttribute(ATT_PRIORITY)) || (p == 2 && element.getAttribute(ATT_PRIORITY) == null)) {
 					IDropAction a = createDropAction(element);
 					if (a != null) {
 						as[j] = a;
 						j++;
 					}
 				}
 			}
 		}

 		if (num == j)
 			return as;

 		IDropAction[] as2 = new IDropAction[j];
 		for (int i = 0; i < j; i++) {
 			as2[i] = as[i];
 		}

 		return as2;
 	}

 	/**
 	 * @param element
 	 * @return Transfer
 	 */
 	protected Transfer createTransfer(IConfigurationElement element) {
 		Object obj = null;
 		obj = createExtension(element, ATT_CLASS);
 		if (obj == null)
 			return null;
 		return (obj instanceof Transfer) ? (Transfer) obj : null;
 	}

 	/**
 	 * @return Transfer[]
 	 */
 	protected Transfer[] createTransfers() {
 		if (cache == null)
 			return new Transfer[0];

 		final int num = cache.size();
 		if (num == 0)
 			return new Transfer[0];

 		Transfer[] ts = new Transfer[num];
 		int j = 0;
 		for (int p = 0; p < PRIORITIES.length; p++) {
 			for (int i = 0; i < num; i++) {
 				Object obj = cache.get(i);
 				if (!(obj instanceof IConfigurationElement))
 					continue;

 				IConfigurationElement element = (IConfigurationElement) obj;
 				if (!TAG_TRANSFER.equals(element.getName()))
 					continue;

 				if (PRIORITIES[p].equals(element.getAttribute(ATT_PRIORITY)) || (p == 2 && element.getAttribute(ATT_PRIORITY) == null)) {
 					Transfer t = createTransfer(element);
 					if (t != null) {
 						ts[j] = t;
 						j++;
 					}
 				}
 			}
 		}

 		if (num == j)
 			return ts;

 		Transfer[] ts2 = new Transfer[j];
 		for (int i = 0; i < j; i++) {
 			ts2[i] = ts[i];
 		}

 		return ts2;
 	}

 	/**
 	 * @param editorId
 	 * @return Transfer[]
 	 */
 	public Transfer[] getDragSourceTransfers(String editorId) {
 		return getDragSourceTransfers(new String[]{editorId});
 	}

 	/**
 	 * @param editorIds
 	 * @return Transfer[]
 	 */
 	public Transfer[] getDragSourceTransfers(String[] editorIds) {
 		long time0 = System.currentTimeMillis();
 		readContributions(editorIds, TAG_DRAG_SOURCE_CONTRIBUTION, PL_DRAG_SOURCE_TRANSFERS);
 		Transfer[] transfers = createTransfers();
 		if (debugTime)
 			System.out.println(getClass().getName() + "#getDragSourceTransfers(" + editorIds + "): " + transfers.length + " transfers created in " + (System.currentTimeMillis() - time0) + "ms"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
 		return transfers;
 	}

 	/**
 	 * @param editorId
 	 * @param className
 	 * @return IDropAction[]
 	 */
 	public IDropAction[] getDropActions(String editorId, String transferClassName) {
 		return getDropActions(new String[]{editorId}, transferClassName);
 	}

 	/**
 	 * @param editorId
 	 * @param className
 	 * @return IDropAction[]
 	 */
 	public IDropAction[] getDropActions(String[] editorIds, String transferClassName) {
 		long time0 = System.currentTimeMillis();
 		readContributions(editorIds, TAG_DROP_TARGET_CONTRIBUTION, PL_DROP_TARGET_TRANSFERS);
 		String transferId = getTransferIdOfClassName(transferClassName);
 		IDropAction[] actions = createDropActions(transferId);
 		if (debugTime)
 			System.out.println(getClass().getName() + "#getDropActions(" + editorIds + "): " + actions.length + " drop actions created in " + (System.currentTimeMillis() - time0) + "ms"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
 		return actions;
 	}

 	/**
 	 * @param editorId
 	 * @return Transfer[]
 	 */
 	public Transfer[] getDropTargetTransfers(String editorId) {
 		return getDropTargetTransfers(new String[]{editorId});
 	}

 	/**
 	 * @param editorIds
 	 * @return Transfer[]
 	 */
 	public Transfer[] getDropTargetTransfers(String[] editorIds) {
 		long time0 = System.currentTimeMillis();
 		readContributions(editorIds, TAG_DROP_TARGET_CONTRIBUTION, PL_DROP_TARGET_TRANSFERS);
 		Transfer[] transfers = createTransfers();
 		if (debugTime) {
 			String idlist = ""; //$NON-NLS-1$
 			if (editorIds.length > 0) {
 				for (int i = 0; i < editorIds.length; i++) {
 					idlist += editorIds[i];
 					if (i < editorIds.length - 1)
 						idlist += ","; //$NON-NLS-1$
 				}
 			}
 			System.out.println(getClass().getName() + "#getDropTargetTransfers(" + idlist + "): " + transfers.length + " transfers created in " + (System.currentTimeMillis() - time0) + "ms"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
 		}
 		return transfers;
 	}

 	/**
 	 * Returns the name of the part ID attribute that is expected in the
 	 * target extension.
 	 *
 	 * @param element
 	 * @return String
 	 */
 	protected String getTargetID(IConfigurationElement element) {
 		String value = element.getAttribute(ATT_TARGET_ID);
 		return value != null ? value : "???"; //$NON-NLS-1$
 	}

 	/**
 	 * @param className
 	 * @return String
 	 */
 	private String getTransferIdOfClassName(String className) {
 		String id = ""; //$NON-NLS-1$
 		final int num = cache.size();
 		if (className == null || cache == null || num == 0)
 			return id;

 		for (int i = 0; i < num; i++) {
 			Object obj = cache.get(i);
 			if (obj instanceof IConfigurationElement) {
 				IConfigurationElement element = (IConfigurationElement) obj;
 				if (className.equals(element.getAttribute(ATT_CLASS))) {
 					id = element.getAttribute(ATT_ID);
 					break;
 				}
 			}
 		}

 		return (id.length() != 0 ? id : className);
 	}

 	/**
 	 * Reads the contributions from the registry for the provided workbench
 	 * part and the provided extension point ID.
 	 *
 	 * @param id
 	 * @param tag
 	 * @param extensionPoint
 	 */
 	protected void readContributions(String[] ids, String tag, String extensionPoint) {
 		cache = null;
 		targetIDs = Arrays.asList(ids);
 		targetContributionTag = tag;
 		IExtensionRegistry registry = Platform.getExtensionRegistry();
 		readRegistry(registry, PLUGIN_ID, extensionPoint);
 	}

 	protected boolean readElement(IConfigurationElement element) {
 		String tag = element.getName();
 		if (tag.equals(targetContributionTag)) {
 			String id = getTargetID(element);
 			if (id == null || !targetIDs.contains(id)) {
 				// This is not of interest to us - don't go deeper
 				return true;
 			}
 		} else if (tag.equals(TAG_TRANSFER)) {
 			if (cache == null)
 				cache = new ArrayList();
 			cache.add(element);
 			return true; // just cache the element - don't go into it
 		} else if (tag.equals(TAG_DROP_ACTION)) {
 			if (cache == null)
 				cache = new ArrayList();
 			//cache.add(createActionDescriptor(element));
 			cache.add(element);
 			return true; // just cache the action - don't go into
 		} else {
 			return false;
 		}

 		readElementChildren(element);
 		return true;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2001, 2004 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	* Jens Lukowski/Innoopract - initial renaming/restructuring
	*
	*******************************************************************************/
	package org.eclipse.wst.sse.ui.internal;



	import java.lang.reflect.InvocationTargetException;
	import java.lang.reflect.Method;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;

	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IConfigurationElement;
	import org.eclipse.core.runtime.IExtensionRegistry;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.swt.custom.BusyIndicator;
	import org.eclipse.swt.dnd.Transfer;
	import org.eclipse.wst.sse.ui.internal.extension.DropActionProxy;
	import org.eclipse.wst.sse.ui.internal.extension.RegistryReader;
	import org.osgi.framework.Bundle;


	/**
	* Builds drop target transfers, drag source transfers, and drop actions
	*/
	public class TransferBuilder extends RegistryReader {

	public static final String ATT_CLASS = "class"; //$NON-NLS-1$
	public static final String ATT_ID = "id"; //$NON-NLS-1$
	public static final String ATT_METHOD = "method"; //$NON-NLS-1$
	public static final String ATT_PRIORITY = "priority"; //$NON-NLS-1$
	public static final String ATT_SINGLETON = "singleton"; //$NON-NLS-1$
	public static final String ATT_TARGET_ID = "targetID"; //$NON-NLS-1$
	public static final String ATT_TRANSFER_ID = "transferID"; //$NON-NLS-1$

	private final static boolean debugTime = "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.wst.sse.ui/transferbuilder/time")); //$NON-NLS-1$ //$NON-NLS-2$

	public static final String PL_DRAG_SOURCE_TRANSFERS = "dragSourceTransfers"; //$NON-NLS-1$
	public static final String PL_DROP_TARGET_TRANSFERS = "dropTargetTransfers"; //$NON-NLS-1$

	public static final String PLUGIN_ID = "org.eclipse.wst.sse.ui"; //$NON-NLS-1$

	public static final String[] PRIORITIES = {"highest", "high", "mid", "low", "lowest"}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$

	public static final String TAG_DRAG_SOURCE_CONTRIBUTION = "dragSourceContribution"; //$NON-NLS-1$
	public static final String TAG_DROP_ACTION = "dropAction"; //$NON-NLS-1$
	public static final String TAG_DROP_TARGET_CONTRIBUTION = "dropTargetContribution"; //$NON-NLS-1$

	public static final String TAG_TRANSFER = "transfer"; //$NON-NLS-1$

	public static final String TRUE = "true"; //$NON-NLS-1$

	/**
	* @param element
	* @param classAttribute
	* @return Object
	* @throws CoreException
	*/
	static Object createExecutableExtension(final IConfigurationElement element, final String classAttribute) throws CoreException {

	Object obj = null;

	String singleton = element.getAttribute(ATT_SINGLETON);
	String method = element.getAttribute(ATT_METHOD);
	if (TRUE.equalsIgnoreCase(singleton) && method != null) {
	try {
	String name = element.getAttribute(ATT_CLASS);
	String pluginId = element.getDeclaringExtension().getNamespace();
	Class cls = Platform.getBundle(pluginId).loadClass(name);
	Method mtd = cls.getMethod(method, new Class[]{});

	obj = mtd.invoke(null, null);
	} catch (ClassNotFoundException e) {
	obj = null;
	} catch (NoSuchMethodException e) {
	obj = null;
	} catch (IllegalAccessException e) {
	obj = null;
	} catch (InvocationTargetException e) {
	obj = null;
	}
	} else {
	obj = element.createExecutableExtension(classAttribute);
	}

	return obj;
	}

	/**
	* Creates an extension. If the extension plugin has not been loaded a
	* busy cursor will be activated during the duration of the load.
	*
	* @param element
	* @param classAttribute
	* @return Object
	* @throws CoreException
	*/
	public static Object createExtension(final IConfigurationElement element, final String classAttribute) {
	// If plugin has been loaded create extension.
	// Otherwise, show busy cursor then create extension.
	final Object[] result = new Object[1];
	String pluginId = element.getDeclaringExtension().getNamespace();
	Bundle bundle = Platform.getBundle(pluginId);
	if (bundle.getState() == Bundle.ACTIVE) {
	try {
	return createExecutableExtension(element, classAttribute);
	} catch (CoreException e) {
	handleCreateExecutableException(result, e);
	}
	} else {
	BusyIndicator.showWhile(null, new Runnable() {
	public void run() {
	try {
	result[0] = createExecutableExtension(element, classAttribute);
	} catch (Exception e) {
	handleCreateExecutableException(result, e);
	}
	}
	});
	}
	return result[0];
	}

	/**
	* @param result
	* @param e
	*/
	protected static void handleCreateExecutableException(Object[] result, Throwable e) {
	Logger.logException(e);
	result[0] = null;

	}

	protected List cache;
	protected String targetContributionTag;

	protected List targetIDs;

	/**
	* @param element
	* @return IDropAction
	*/
	protected IDropAction createDropAction(IConfigurationElement element) {
	Object obj = null;
	obj = createExtension(element, ATT_CLASS);
	if (obj == null)
	return null;
	return (obj instanceof IDropAction) ? (IDropAction) DropActionProxy.newInstance(obj) : null;
	}

	/**
	* @param transferId
	* @return IDropAction[]
	*/
	protected IDropAction[] createDropActions(String transferId) {
	if (cache == null)
	return new IDropAction[0];

	final int num = cache.size();
	if (num == 0)
	return new IDropAction[0];

	IDropAction[] as = new IDropAction[num];
	int j = 0;
	for (int p = 0; p < PRIORITIES.length; p++) {
	for (int i = 0; i < num; i++) {
	Object obj = cache.get(i);
	if (!(obj instanceof IConfigurationElement))
	continue;

	IConfigurationElement element = (IConfigurationElement) obj;
	if (!(TAG_DROP_ACTION.equals(element.getName())) \|\| !(transferId.equals(element.getAttribute(ATT_TRANSFER_ID))))
	continue;

	if (PRIORITIES[p].equals(element.getAttribute(ATT_PRIORITY)) \|\| (p == 2 && element.getAttribute(ATT_PRIORITY) == null)) {
	IDropAction a = createDropAction(element);
	if (a != null) {
	as[j] = a;
	j++;
	}
	}
	}
	}

	if (num == j)
	return as;

	IDropAction[] as2 = new IDropAction[j];
	for (int i = 0; i < j; i++) {
	as2[i] = as[i];
	}

	return as2;
	}

	/**
	* @param element
	* @return Transfer
	*/
	protected Transfer createTransfer(IConfigurationElement element) {
	Object obj = null;
	obj = createExtension(element, ATT_CLASS);
	if (obj == null)
	return null;
	return (obj instanceof Transfer) ? (Transfer) obj : null;
	}

	/**
	* @return Transfer[]
	*/
	protected Transfer[] createTransfers() {
	if (cache == null)
	return new Transfer[0];

	final int num = cache.size();
	if (num == 0)
	return new Transfer[0];

	Transfer[] ts = new Transfer[num];
	int j = 0;
	for (int p = 0; p < PRIORITIES.length; p++) {
	for (int i = 0; i < num; i++) {
	Object obj = cache.get(i);
	if (!(obj instanceof IConfigurationElement))
	continue;

	IConfigurationElement element = (IConfigurationElement) obj;
	if (!TAG_TRANSFER.equals(element.getName()))
	continue;

	if (PRIORITIES[p].equals(element.getAttribute(ATT_PRIORITY)) \|\| (p == 2 && element.getAttribute(ATT_PRIORITY) == null)) {
	Transfer t = createTransfer(element);
	if (t != null) {
	ts[j] = t;
	j++;
	}
	}
	}
	}

	if (num == j)
	return ts;

	Transfer[] ts2 = new Transfer[j];
	for (int i = 0; i < j; i++) {
	ts2[i] = ts[i];
	}

	return ts2;
	}

	/**
	* @param editorId
	* @return Transfer[]
	*/
	public Transfer[] getDragSourceTransfers(String editorId) {
	return getDragSourceTransfers(new String[]{editorId});
	}

	/**
	* @param editorIds
	* @return Transfer[]
	*/
	public Transfer[] getDragSourceTransfers(String[] editorIds) {
	long time0 = System.currentTimeMillis();
	readContributions(editorIds, TAG_DRAG_SOURCE_CONTRIBUTION, PL_DRAG_SOURCE_TRANSFERS);
	Transfer[] transfers = createTransfers();
	if (debugTime)
	System.out.println(getClass().getName() + "#getDragSourceTransfers(" + editorIds + "): " + transfers.length + " transfers created in " + (System.currentTimeMillis() - time0) + "ms"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
	return transfers;
	}

	/**
	* @param editorId
	* @param className
	* @return IDropAction[]
	*/
	public IDropAction[] getDropActions(String editorId, String transferClassName) {
	return getDropActions(new String[]{editorId}, transferClassName);
	}

	/**
	* @param editorId
	* @param className
	* @return IDropAction[]
	*/
	public IDropAction[] getDropActions(String[] editorIds, String transferClassName) {
	long time0 = System.currentTimeMillis();
	readContributions(editorIds, TAG_DROP_TARGET_CONTRIBUTION, PL_DROP_TARGET_TRANSFERS);
	String transferId = getTransferIdOfClassName(transferClassName);
	IDropAction[] actions = createDropActions(transferId);
	if (debugTime)
	System.out.println(getClass().getName() + "#getDropActions(" + editorIds + "): " + actions.length + " drop actions created in " + (System.currentTimeMillis() - time0) + "ms"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
	return actions;
	}

	/**
	* @param editorId
	* @return Transfer[]
	*/
	public Transfer[] getDropTargetTransfers(String editorId) {
	return getDropTargetTransfers(new String[]{editorId});
	}

	/**
	* @param editorIds
	* @return Transfer[]
	*/
	public Transfer[] getDropTargetTransfers(String[] editorIds) {
	long time0 = System.currentTimeMillis();
	readContributions(editorIds, TAG_DROP_TARGET_CONTRIBUTION, PL_DROP_TARGET_TRANSFERS);
	Transfer[] transfers = createTransfers();
	if (debugTime) {
	String idlist = ""; //$NON-NLS-1$
	if (editorIds.length > 0) {
	for (int i = 0; i < editorIds.length; i++) {
	idlist += editorIds[i];
	if (i < editorIds.length - 1)
	idlist += ","; //$NON-NLS-1$
	}
	}
	System.out.println(getClass().getName() + "#getDropTargetTransfers(" + idlist + "): " + transfers.length + " transfers created in " + (System.currentTimeMillis() - time0) + "ms"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
	}
	return transfers;
	}

	/**
	* Returns the name of the part ID attribute that is expected in the
	* target extension.
	*
	* @param element
	* @return String
	*/
	protected String getTargetID(IConfigurationElement element) {
	String value = element.getAttribute(ATT_TARGET_ID);
	return value != null ? value : "???"; //$NON-NLS-1$
	}

	/**
	* @param className
	* @return String
	*/
	private String getTransferIdOfClassName(String className) {
	String id = ""; //$NON-NLS-1$
	final int num = cache.size();
	if (className == null \|\| cache == null \|\| num == 0)
	return id;

	for (int i = 0; i < num; i++) {
	Object obj = cache.get(i);
	if (obj instanceof IConfigurationElement) {
	IConfigurationElement element = (IConfigurationElement) obj;
	if (className.equals(element.getAttribute(ATT_CLASS))) {
	id = element.getAttribute(ATT_ID);
	break;
	}
	}
	}

	return (id.length() != 0 ? id : className);
	}

	/**
	* Reads the contributions from the registry for the provided workbench
	* part and the provided extension point ID.
	*
	* @param id
	* @param tag
	* @param extensionPoint
	*/
	protected void readContributions(String[] ids, String tag, String extensionPoint) {
	cache = null;
	targetIDs = Arrays.asList(ids);
	targetContributionTag = tag;
	IExtensionRegistry registry = Platform.getExtensionRegistry();
	readRegistry(registry, PLUGIN_ID, extensionPoint);
	}

	protected boolean readElement(IConfigurationElement element) {
	String tag = element.getName();
	if (tag.equals(targetContributionTag)) {
	String id = getTargetID(element);
	if (id == null \|\| !targetIDs.contains(id)) {
	// This is not of interest to us - don't go deeper
	return true;
	}
	} else if (tag.equals(TAG_TRANSFER)) {
	if (cache == null)
	cache = new ArrayList();
	cache.add(element);
	return true; // just cache the element - don't go into it
	} else if (tag.equals(TAG_DROP_ACTION)) {
	if (cache == null)
	cache = new ArrayList();
	//cache.add(createActionDescriptor(element));
	cache.add(element);
	return true; // just cache the action - don't go into
	} else {
	return false;
	}

	readElementChildren(element);
	return true;
	}
	}