/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.uima.impl;
import java.util.Map;
import org.apache.uima.ResourceFactory;
import org.apache.uima.resource.CustomResourceSpecifier;
import org.apache.uima.resource.Resource;
import org.apache.uima.resource.ResourceInitializationException;
import org.apache.uima.resource.ResourceManager;
import org.apache.uima.resource.ResourceSpecifier;
/**
* Resource Factory that handles {@link CustomResourceSpecifier} elements.
*/
public class CustomResourceFactory_impl implements ResourceFactory {
/**
* @see org.apache.uima.ResourceFactory#produceResource(java.lang.Class,
* org.apache.uima.resource.ResourceSpecifier, java.util.Map)
*/
public Resource produceResource(Class aResourceClass, ResourceSpecifier aSpecifier,
Map aAdditionalParams) throws ResourceInitializationException {
if (aSpecifier instanceof CustomResourceSpecifier) {
String className = ((CustomResourceSpecifier)aSpecifier).getResourceClassName();
//check additional params map for ResourceManager, and use the UIMA extension ClassLoader
//if one exists
ClassLoader loader = null;
ResourceManager resMgr = null;
if (aAdditionalParams != null) {
resMgr = (ResourceManager)aAdditionalParams.get(Resource.PARAM_RESOURCE_MANAGER);
}
if (resMgr != null) {
loader = resMgr.getExtensionClassLoader();
}
if (loader == null) {
loader = this.getClass().getClassLoader();
}
//load the Resourceclass
Class resourceClass;
try {
resourceClass = Class.forName(className, true, loader);
} catch (ClassNotFoundException e) {
throw new ResourceInitializationException(
ResourceInitializationException.CLASS_NOT_FOUND, new Object[] { className,
aSpecifier.getSourceUrlString() }, e);
}
//check that the class implements the required interface
if (!aResourceClass.isAssignableFrom(resourceClass)) {
throw new ResourceInitializationException(
ResourceInitializationException.RESOURCE_DOES_NOT_IMPLEMENT_INTERFACE,
new Object[] { className, aResourceClass.getName(),
aSpecifier.getSourceUrlString() });
}
// instantiate this Resource Class
Resource resource;
try {
resource = (Resource) resourceClass.newInstance();
} catch (InstantiationException e) {
throw new ResourceInitializationException(
ResourceInitializationException.COULD_NOT_INSTANTIATE, new Object[] { className,
aSpecifier.getSourceUrlString() }, e);
} catch (IllegalAccessException e) {
throw new ResourceInitializationException(
ResourceInitializationException.COULD_NOT_INSTANTIATE, new Object[] { className,
aSpecifier.getSourceUrlString() }, e);
}
// attempt to initialize it
if (resource.initialize(aSpecifier, aAdditionalParams)) {
// success!
return resource;
} else
// failure, for some unknown reason :(
{
throw new ResourceInitializationException(
ResourceInitializationException.ERROR_INITIALIZING_FROM_DESCRIPTOR, new Object[] {
className, aSpecifier.getSourceUrlString() });
}
}
//unsupported ResourceSpecifier type
return null;
}
}