/*
 * 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.accumulo.core.summary;

import java.io.IOException;

import org.apache.accumulo.core.client.summary.Summarizer;
import org.apache.accumulo.core.client.summary.SummarizerConfiguration;
import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.start.classloader.vfs.AccumuloVFSClassLoader;

public class SummarizerFactory {
  private ClassLoader classloader;
  private String context;

  public SummarizerFactory() {
    this.classloader = SummarizerFactory.class.getClassLoader();
  }

  public SummarizerFactory(ClassLoader classloader) {
    this.classloader = classloader;
  }

  public SummarizerFactory(AccumuloConfiguration tableConfig) {
    this.context = tableConfig.get(Property.TABLE_CLASSPATH);
  }

  private Summarizer newSummarizer(String classname) throws ClassNotFoundException, IOException, InstantiationException, IllegalAccessException {
    if (classloader != null) {
      return classloader.loadClass(classname).asSubclass(Summarizer.class).newInstance();
    } else {
      if (context != null && !context.equals(""))
        return AccumuloVFSClassLoader.getContextManager().loadClass(context, classname, Summarizer.class).newInstance();
      else
        return AccumuloVFSClassLoader.loadClass(classname, Summarizer.class).newInstance();
    }
  }

  public Summarizer getSummarizer(SummarizerConfiguration conf) {
    try {
      Summarizer summarizer = newSummarizer(conf.getClassName());
      return summarizer;
    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | IOException e) {
      throw new RuntimeException(e);
    }
  }
}