| /******************************************************************************* |
| * Copyright (c) 2008, 2015 Freescale Semiconductor and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Freescale Semiconductor - initial API and implementation |
| * IBM Corporation - ongoing development |
| * James Blackburn (Broadcom Corp.) - ongoing development |
| * Lars Vogel <Lars.Vogel@vogella.com> - Bug 473427 |
| *******************************************************************************/ |
| package org.eclipse.core.internal.resources; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.eclipse.core.internal.utils.Messages; |
| import org.eclipse.core.internal.utils.Policy; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.resources.ResourcesPlugin; |
| import org.eclipse.core.resources.variableresolvers.PathVariableResolver; |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.osgi.util.NLS; |
| |
| /** |
| * Repository for all variable providers available through the extension points. |
| * @since 3.6 |
| */ |
| public class ProjectVariableProviderManager { |
| |
| public static class Descriptor { |
| PathVariableResolver provider = null; |
| String name = null; |
| String value = null; |
| |
| public Descriptor(IExtension extension, IConfigurationElement element) throws RuntimeException, CoreException { |
| name = element.getAttribute("variable"); //$NON-NLS-1$ |
| value = element.getAttribute("value"); //$NON-NLS-1$ |
| try { |
| String classAttribute = "class"; //$NON-NLS-1$ |
| if (element.getAttribute(classAttribute) != null) |
| provider = (PathVariableResolver) element.createExecutableExtension(classAttribute); |
| } catch (CoreException e) { |
| Policy.log(e); |
| } |
| if (name == null) |
| fail(NLS.bind(Messages.mapping_invalidDef, extension.getUniqueIdentifier())); |
| } |
| |
| protected void fail(String reason) throws CoreException { |
| throw new ResourceException(new Status(IStatus.ERROR, ResourcesPlugin.PI_RESOURCES, 1, reason, null)); |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public String getValue(String variable, IResource resource) { |
| if (value != null) |
| return value; |
| return provider.getValue(variable, resource); |
| } |
| |
| public String[] getVariableNames(String variable, IResource resource) { |
| if (provider != null) |
| return provider.getVariableNames(variable, resource); |
| if (name.equals(variable)) |
| return new String[] {variable}; |
| return null; |
| } |
| } |
| |
| private static Map<String, Descriptor> descriptors; |
| private static Descriptor[] descriptorsArray; |
| private static ProjectVariableProviderManager instance = new ProjectVariableProviderManager(); |
| |
| public static ProjectVariableProviderManager getDefault() { |
| return instance; |
| } |
| |
| public Descriptor[] getDescriptors() { |
| lazyInitialize(); |
| return descriptorsArray; |
| } |
| |
| protected void lazyInitialize() { |
| if (descriptors != null) |
| return; |
| IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(ResourcesPlugin.PI_RESOURCES, ResourcesPlugin.PT_VARIABLE_PROVIDERS); |
| IExtension[] extensions = point.getExtensions(); |
| descriptors = new HashMap<>(extensions.length * 2 + 1); |
| for (IExtension extension : extensions) { |
| IConfigurationElement[] elements = extension.getConfigurationElements(); |
| int count = elements.length; |
| for (int j = 0; j < count; j++) { |
| IConfigurationElement element = elements[j]; |
| String elementName = element.getName(); |
| if (elementName.equalsIgnoreCase("variableResolver")) { //$NON-NLS-1$ |
| Descriptor desc = null; |
| try { |
| desc = new Descriptor(extension, element); |
| } catch (CoreException e) { |
| Policy.log(e); |
| } |
| if (desc != null) |
| descriptors.put(desc.getName(), desc); |
| } |
| } |
| } |
| descriptorsArray = descriptors.values().toArray(new Descriptor[descriptors.size()]); |
| } |
| |
| public Descriptor findDescriptor(String name) { |
| lazyInitialize(); |
| Descriptor result = descriptors.get(name); |
| return result; |
| } |
| } |