| /******************************************************************************* |
| * Copyright (c) 2001, 2008 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 |
| *******************************************************************************/ |
| package org.eclipse.wst.validation.internal.plugin; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.wst.validation.internal.IProjectValidationHelper; |
| |
| public class ValidationHelperRegistryReader { |
| |
| /** validationHelper - extension point name. */ |
| public static final String VALIDATION_HELPER = "validationHelper"; //$NON-NLS-1$ |
| |
| static final String ATT_ID = "id"; //$NON-NLS-1$ |
| |
| /** helperClass - class that implements the extension. */ |
| static final String ATT_HELPER_CLASS = "helperClass"; //$NON-NLS-1$ |
| |
| private static ValidationHelperRegistryReader INSTANCE = null; |
| private List<IProjectValidationHelper> _validationHelpers; |
| |
| public ValidationHelperRegistryReader() { |
| } |
| |
| public static ValidationHelperRegistryReader getInstance() { |
| if (INSTANCE == null) { |
| INSTANCE = new ValidationHelperRegistryReader(); |
| INSTANCE.readRegistry(); |
| } |
| return INSTANCE; |
| } |
| |
| /** |
| * Read the extension point and parse it. |
| */ |
| public void readRegistry() { |
| IExtensionPoint point = Platform.getExtensionRegistry() |
| .getExtensionPoint(ValidationPlugin.PLUGIN_ID, VALIDATION_HELPER); |
| if (point == null)return; |
| IConfigurationElement[] elements = point.getConfigurationElements(); |
| for (int i = 0; i < elements.length; i++) { |
| internalReadElement(elements[i]); |
| } |
| } |
| |
| private void internalReadElement(IConfigurationElement element) { |
| boolean recognized = this.readElement(element); |
| if (!recognized) { |
| logError(element, "Error processing extension: " + element); //$NON-NLS-1$ |
| } |
| } |
| |
| /* |
| * Logs the error in the desktop log using the provided text and the information in the configuration element. |
| */ |
| protected void logError(IConfigurationElement element, String text) { |
| IExtension extension = element.getDeclaringExtension(); |
| StringBuffer buf = new StringBuffer(); |
| buf.append("Plugin " + extension.getContributor().getName() + ", extension " + extension.getExtensionPointUniqueIdentifier()); //$NON-NLS-1$ //$NON-NLS-2$ |
| buf.append("\n" + text); //$NON-NLS-1$ |
| ValidationPlugin.getPlugin().logMessage(IStatus.ERROR, buf.toString()); |
| } |
| |
| private List<IProjectValidationHelper> getValidationHelpers() { |
| if (_validationHelpers == null) |
| _validationHelpers = new ArrayList<IProjectValidationHelper>(); |
| return _validationHelpers; |
| } |
| |
| public boolean readElement(IConfigurationElement element) { |
| if (!element.getName().equals(VALIDATION_HELPER)) |
| return false; |
| IProjectValidationHelper helper = null; |
| try { |
| helper = (IProjectValidationHelper) element.createExecutableExtension(ATT_HELPER_CLASS); |
| getValidationHelpers().add(helper); |
| return true; |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| return false; |
| } |
| |
| public IProjectValidationHelper getValidationHelper() { |
| if (getValidationHelpers().isEmpty())return null; |
| return getValidationHelpers().get(0); |
| } |
| |
| } |