/*
* Copyright 2003-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codehaus.groovy.runtime.m12n;
import groovy.lang.GroovyRuntimeException;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import java.util.logging.Logger;
/**
* A {@link SimpleExtensionModule} implementation which reads extension classes
* metadata from META-INF.
*
* @since 2.0.0
*
* @author Cedric Champeau
*/
public class MetaInfExtensionModule extends SimpleExtensionModule {
private static final Logger LOG = Logger.getLogger(MetaInfExtensionModule.class.getName());
public static final String MODULE_INSTANCE_CLASSES_KEY = "extensionClasses";
public static final String MODULE_STATIC_CLASSES_KEY = "staticExtensionClasses";
private final List<Class> instanceExtensionClasses;
private final List<Class> staticExtensionClasses;
@Override
public List<Class> getInstanceMethodsExtensionClasses() {
return instanceExtensionClasses;
}
@Override
public List<Class> getStaticMethodsExtensionClasses() {
return staticExtensionClasses;
}
private MetaInfExtensionModule(final String moduleName, final String moduleVersion, final List<Class> instanceExtensionClasses, final List<Class> staticExtensionClasses) {
super(moduleName, moduleVersion);
this.instanceExtensionClasses = instanceExtensionClasses;
this.staticExtensionClasses = staticExtensionClasses;
}
public static MetaInfExtensionModule newModule(final Properties properties, final ClassLoader loader) {
String name = properties.getProperty(PropertiesModuleFactory.MODULE_NAME_KEY);
if (name==null) throw new GroovyRuntimeException("Module file hasn't set the module name using key ["+PropertiesModuleFactory.MODULE_NAME_KEY+"]");
String version = properties.getProperty(PropertiesModuleFactory.MODULE_VERSION_KEY);
if (version==null) throw new GroovyRuntimeException("Module file hasn't set the module version using key ["+PropertiesModuleFactory.MODULE_VERSION_KEY+"]");
String[] extensionClasses = properties.getProperty(MODULE_INSTANCE_CLASSES_KEY, "").trim().split("[,; ]");
String[] staticExtensionClasses = properties.getProperty(MODULE_STATIC_CLASSES_KEY, "").trim().split("[,; ]");
List<Class> instanceClasses = new ArrayList<Class>(extensionClasses.length);
List<Class> staticClasses = new ArrayList<Class>(staticExtensionClasses.length);
List<String> errors = new LinkedList<String>();
for (String extensionClass : extensionClasses) {
try {
extensionClass = extensionClass.trim();
if (extensionClass.length()>0) {
instanceClasses.add(loader.loadClass(extensionClass));
}
} catch (ClassNotFoundException e) {
errors.add(extensionClass);
} catch (NoClassDefFoundError e) {
errors.add(extensionClass);
} catch (UnsupportedClassVersionError e) {
errors.add(extensionClass);
}
}
for (String extensionClass : staticExtensionClasses) {
try {
extensionClass = extensionClass.trim();
if (extensionClass.length()>0) {
staticClasses.add(loader.loadClass(extensionClass));
}
} catch (ClassNotFoundException e) {
errors.add(extensionClass);
} catch (NoClassDefFoundError e) {
errors.add(extensionClass);
} catch (UnsupportedClassVersionError e) {
errors.add(extensionClass);
}
}
if (!errors.isEmpty()) {
for (String error : errors) {
LOG.warning("Module ["+name+"] - Unable to load extension class ["+error+"]");
}
}
return new MetaInfExtensionModule(name, version, instanceClasses, staticClasses);
}
}