com.uber.hoodie.common.util.ReflectionUtils Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 Uber Technologies, Inc. ([email protected])
 *
 * 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 com.uber.hoodie.common.util;

import com.uber.hoodie.common.model.HoodieRecordPayload;
import com.uber.hoodie.exception.HoodieException;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

public class ReflectionUtils {

  private static Map> clazzCache = new HashMap<>();

  public static  T loadClass(String fqcn) {
    try {
      if (clazzCache.get(fqcn) == null) {
        Class clazz = Class.forName(fqcn);
        clazzCache.put(fqcn, clazz);
      }
      return (T) clazzCache.get(fqcn).newInstance();
    } catch (ClassNotFoundException e) {
      throw new HoodieException("Could not load class " + fqcn, e);
    } catch (InstantiationException e) {
      throw new HoodieException("Could not load class " + fqcn, e);
    } catch (IllegalAccessException e) {
      throw new HoodieException("Could not load class " + fqcn, e);
    }
  }

  /**
   * Instantiate a given class with a generic record payload
   */
  public static  T loadPayload(String recordPayloadClass,
      Object[] payloadArgs,
      Class... constructorArgTypes) {
    try {
      if (clazzCache.get(recordPayloadClass) == null) {
        Class clazz = Class.forName(recordPayloadClass);
        clazzCache.put(recordPayloadClass, clazz);
      }
      return (T) clazzCache.get(recordPayloadClass).getConstructor(constructorArgTypes)
          .newInstance(payloadArgs);
    } catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
      throw new HoodieException("Unable to instantiate payload class ", e);
    } catch (ClassNotFoundException e) {
      throw new HoodieException("Unable to instantiate payload class ", e);
    }
  }

}