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/*******************************************************************************
* Copyright (c) 2010, 2011 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.core.internal.utility;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jpt.common.core.JptCommonCorePlugin;
import org.eclipse.jpt.common.core.internal.JptCommonCoreMessages;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Bundle;
/**
* Utilities for extension point management, validation, etc.
*/
public class XPointTools {
public static String findRequiredAttribute(
IConfigurationElement configElement, String attributeName)
throws XPointException {
String val = configElement.getAttribute(attributeName);
if (val == null) {
logMissingAttribute(configElement, attributeName);
throw new XPointException();
}
return val;
}
public static <T> T instantiate(String pluginId, String extensionPoint, String className, Class<T> interfaze) {
Class<T> clazz = loadClass(pluginId, extensionPoint, className, interfaze);
return (clazz == null) ? null : instantiate(pluginId, extensionPoint, clazz);
}
/**
* Instantiate the specified class.
*/
public static <T> T instantiate(String pluginId, String extensionPoint, Class<T> clazz) {
try {
return clazz.newInstance();
} catch (Exception ex) {
logFailedInstantiation(ex, pluginId, extensionPoint, clazz.getName());
return null;
}
}
/**
* Load the specified class and cast it to the specified interface.
*/
private static <T> Class<T> loadClass(String pluginId, String extensionPoint, String className, Class<T> interfaze) {
Bundle bundle = Platform.getBundle(pluginId);
Class<?> clazz;
try {
clazz = bundle.loadClass(className);
} catch (Exception ex) {
logFailedClassLoad(ex, pluginId, extensionPoint, className);
return null;
}
if (interfaze.isAssignableFrom(clazz)) {
@SuppressWarnings("unchecked")
Class<T> clazzT = (Class<T>) clazz;
return clazzT;
}
logFailedInterfaceAssignment(pluginId, extensionPoint, className, interfaze.getName());
return null;
}
public static void logDuplicateExtension(String extensionPoint, String nodeName, String value) {
log(JptCommonCoreMessages.REGISTRY_DUPLICATE, extensionPoint, nodeName, value);
}
public static void logMissingAttribute(IConfigurationElement configElement, String attributeName) {
log(JptCommonCoreMessages.REGISTRY_MISSING_ATTRIBUTE,
attributeName,
configElement.getName(),
configElement.getDeclaringExtension().getExtensionPointUniqueIdentifier(),
configElement.getContributor().getName());
}
public static void logInvalidValue(
IConfigurationElement configElement, String nodeName, String invalidValue) {
log(JptCommonCoreMessages.REGISTRY_INVALID_VALUE,
invalidValue,
nodeName,
configElement.getDeclaringExtension().getExtensionPointUniqueIdentifier(),
configElement.getContributor().getName());
}
private static void logFailedClassLoad(Exception ex, String pluginId, String extensionPoint, String className) {
log(ex, JptCommonCoreMessages.REGISTRY_FAILED_CLASS_LOAD,
className,
extensionPoint,
pluginId);
}
private static void logFailedInterfaceAssignment(
String pluginId, String extensionPoint, String className, String interfaceName) {
log(JptCommonCoreMessages.REGISTRY_FAILED_INTERFACE_ASSIGNMENT,
className,
extensionPoint,
pluginId,
interfaceName);
}
private static void logFailedInstantiation(Exception ex, String pluginId, String extensionPoint, String className) {
log(ex, JptCommonCoreMessages.REGISTRY_FAILED_INSTANTIATION,
className,
extensionPoint,
pluginId);
}
public static void log(String msg, String... bindings) {
JptCommonCorePlugin.log(NLS.bind(msg, bindings));
}
public static void log(Throwable ex, String msg, String... bindings) {
JptCommonCorePlugin.log(NLS.bind(msg, bindings), ex);
}
public static void log(Throwable ex) {
JptCommonCorePlugin.log(ex);
}
public static final class XPointException extends Exception {
private static final long serialVersionUID = 1L;
}
}
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