| /******************************************************************************* |
| * 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.core.internal.tasks; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.core.runtime.content.IContentType; |
| import org.eclipse.core.runtime.content.IContentTypeManager; |
| import org.eclipse.wst.sse.core.internal.Logger; |
| import org.eclipse.wst.sse.core.internal.SSECorePlugin; |
| import org.eclipse.wst.sse.core.internal.util.StringUtils; |
| |
| class TaskScannerDelegateRegistryReader { |
| private static final boolean _debugReader = "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.wst.sse.core/tasks/registry")); //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| private String ATT_CLASS = "class"; //$NON-NLS-1$ |
| private String ATT_CONTENT_TYPES = "contentTypeIds"; //$NON-NLS-1$ |
| private String DELEGATE_EXTENSION_POINT_ID = SSECorePlugin.ID + ".taskscanner"; //$NON-NLS-1$ |
| |
| private IConfigurationElement[] fDelegateElements; |
| |
| // a mapping from content types to ITaskScannerDelegate instances |
| private Map fDelegates = null; |
| |
| private String NAME_SCANNER = "scanner"; //$NON-NLS-1$ |
| |
| TaskScannerDelegateRegistryReader() { |
| super(); |
| } |
| |
| public ITaskScannerDelegate[] getTaskScannerDelegates(String contentTypeID) { |
| if (fDelegateElements == null) { |
| readRegistry(); |
| } |
| IContentTypeManager contentTypeManager = Platform.getContentTypeManager(); |
| ITaskScannerDelegate[] delegates = (ITaskScannerDelegate[]) fDelegates.get(contentTypeID); |
| if (delegates == null) { |
| // fine the relevant extensions |
| List elements = new ArrayList(0); |
| IConfigurationElement[] delegateElements = fDelegateElements; |
| IContentType contentType = contentTypeManager.getContentType(contentTypeID); |
| if (contentType != null) { |
| for (int j = 0; j < delegateElements.length; j++) { |
| if (!delegateElements[j].getName().equals(NAME_SCANNER)) |
| continue; |
| String[] contentTypeIds = StringUtils.unpack(delegateElements[j].getAttribute(ATT_CONTENT_TYPES)); |
| IContentType[] contentTypes = new IContentType[contentTypeIds.length]; |
| for (int i = 0; i < contentTypeIds.length; i++) { |
| contentTypes[i] = contentTypeManager.getContentType(contentTypeIds[i].trim()); |
| } |
| for (int k = 0; k < contentTypeIds.length; k++) { |
| // allow wildcards to be returned as well |
| if (contentTypes[k] != null && contentType.isKindOf(contentTypes[k])) { |
| elements.add(delegateElements[j]); |
| } |
| } |
| } |
| // instantiate and save them |
| List delegateList = new ArrayList(elements.size()); |
| for (int i = 0; i < elements.size(); i++) { |
| try { |
| ITaskScannerDelegate delegate = (ITaskScannerDelegate) ((IConfigurationElement) elements.get(i)).createExecutableExtension(ATT_CLASS); |
| if (delegate != null) { |
| delegateList.add(delegate); |
| } |
| } |
| catch (CoreException e) { |
| Logger.logException("Non-fatal exception creating task scanner delegate for " + contentTypeID, e); //$NON-NLS-1$ |
| } |
| } |
| delegates = (ITaskScannerDelegate[]) delegateList.toArray(new ITaskScannerDelegate[delegateList.size()]); |
| fDelegates.put(contentTypeID, delegates); |
| if (_debugReader) { |
| System.out.println("Created " + delegates.length + " task scanner delegate for " + contentTypeID); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| } |
| } |
| return delegates; |
| } |
| |
| private void readRegistry() { |
| fDelegates = new HashMap(); |
| // Just remember the elements, so plugins don't have to be activated, |
| // unless extension attributes match those of interest |
| IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(DELEGATE_EXTENSION_POINT_ID); |
| if (point != null) { |
| fDelegateElements = point.getConfigurationElements(); |
| } |
| } |
| } |