geode-core/src/main/java/org/apache/geode/management/internal/configuration/domain/DeclarableTypeInstantiator.java

/*
 * 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.geode.management.internal.configuration.domain;

import java.util.Properties;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.Declarable;
import org.apache.geode.cache.configuration.ClassNameType;
import org.apache.geode.cache.configuration.DeclarableType;
import org.apache.geode.cache.configuration.ObjectType;
import org.apache.geode.cache.configuration.ParameterType;
import org.apache.geode.internal.classloader.ClassPathLoader;
import org.apache.geode.management.configuration.ClassName;

public abstract class DeclarableTypeInstantiator {

  public static <T extends Declarable> T newInstance(DeclarableType declarableType, Cache cache) {
    try {
      Class<T> loadedClass =
          (Class<T>) ClassPathLoader.getLatest().forName(declarableType.getClassName());
      T declarable = loadedClass.newInstance();
      Properties initProperties = new Properties();
      for (ParameterType parameter : declarableType.getParameters()) {
        initProperties.put(parameter.getName(), newInstance(parameter, cache));
      }
      declarable.initialize(cache, initProperties);
      return declarable;
    } catch (Exception e) {
      throw new RuntimeException(
          "Error instantiating class: <" + declarableType.getClassName() + ">", e);
    }
  }


  public static <T> T newInstance(ObjectType objectType, Cache cache) {
    if (objectType.getString() != null) {
      return (T) objectType.getString();
    }

    if (objectType.getDeclarable() != null) {
      return newInstance(objectType.getDeclarable(), cache);
    }

    return null;
  }

  public static <V> V newInstance(ClassName type, Cache cache) {
    try {
      Class<V> loadedClass = (Class<V>) ClassPathLoader.getLatest().forName(type.getClassName());
      V object = loadedClass.newInstance();
      if (object instanceof Declarable) {
        Declarable declarable = (Declarable) object;
        declarable.initialize(cache, type.getInitProperties());
        declarable.init(type.getInitProperties()); // for backwards compatibility
      }
      return object;
    } catch (Exception e) {
      throw new RuntimeException("Error instantiating class: <" + type.getClassName() + ">", e);
    }
  }

  public static <V> V newInstance(ClassNameType className) {
    try {
      Class<V> loadedClass =
          (Class<V>) ClassPathLoader.getLatest().forName(className.getClassName());
      return loadedClass.newInstance();
    } catch (Exception e) {
      throw new RuntimeException("Error instantiating class: <" + className.getClassName() + ">",
          e);
    }
  }
}