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A set of utilities and tools to speed up and ease programming in Java.
There is a newer version: 0.5
/*
 * (c) 2005 David B. Bracewell
 *
 * 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 com.davidbracewell.reflection;

import com.davidbracewell.config.Config;
import com.davidbracewell.conversion.Cast;
import com.davidbracewell.conversion.Convert;
import com.google.common.collect.Lists;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentSkipListMap;

/**
 * Methods for constructing beans and setting their parameters using value in the {@link Config}
 *
 * @author David B. Bracewell
 */
public class BeanUtils {


  private static final ConcurrentSkipListMap SINGLETONS = new ConcurrentSkipListMap<>();

  private static boolean doCollection(BeanMap beanMap, String configProperty, String propertyName, Class valueType) {
    // Check if we need a Collection
    if (Collection.class.isAssignableFrom(valueType)) {
      String value = Config.get(configProperty).asString();
      Class elementType = Config.get(configProperty + ".elementType").asClass(String.class);
      beanMap.put(propertyName, Convert.convert(value, valueType, elementType));
      return true;
    }
    return false;
  }

  private static boolean doMap(BeanMap beanMap, String configProperty, String propertyName, Class valueType) {
    // Check if we need a Map
    if (Map.class.isAssignableFrom(valueType)) {
      String value = Config.get(configProperty).asString();
      Class mapKeyType = Config.get(configProperty + ".keyType").asClass(String.class);
      Class mapValueType = Config.get(configProperty + ".valueType").asClass(String.class);
      beanMap.put(propertyName, Convert.convert(value, valueType, mapKeyType, mapValueType));
      return true;
    }
    return false;
  }

  private static void doParametrization(BeanMap beanMap, String match) {
    for (String propertyName : beanMap.getSetters()) {
      String configOption = match + propertyName;
      String typeProperty = configOption + ".type";
      if (Config.hasProperty(typeProperty)) {
        Class valueType = Config.get(typeProperty).asClass();
        if (valueType == null) {
          throw new IllegalArgumentException(Config.get(typeProperty).asString() + " is not a valid class");
        }
        if (doCollection(beanMap, configOption, propertyName, valueType) ||
            doMap(beanMap, configOption, propertyName, valueType)) {
          continue;
        }
        beanMap.put(propertyName, Config.get(configOption).as(valueType));
      } else if (Config.hasProperty(configOption)) {
        beanMap.put(propertyName, Config.get(configOption).as(Object.class));
      }
    }
  }

  /**
   * Constructs a new instance of the given class and then sets it properties.
   *
   * @param clazz The class that we want to instantiate
   * @return A new instance of the given class
   */
  public static  T getBean(Class clazz) throws ReflectionException {
    return parameterizeObject(Reflect.onClass(clazz).create().get());
  }

  /**
   * Instantiates a named bean (defined via the Config) which can describe the class (name.class) and properties or
   * can instantiate a bean that is described as a script.
   *
   * @param name  The name of the bean
   * @param clazz The class type of the bean
   * @return The named bean
   */
  public static  T getNamedBean(String name, Class clazz) throws ReflectionException {
    if (SINGLETONS.containsKey(name)) {
      return Cast.as(SINGLETONS.get(name));
    }

    if (Config.valueIsScript(name)) {
      return Config.get(name).as(clazz);
    }

    Reflect reflect;
    if (Config.hasProperty(name + ".class")) {
      reflect = Reflect.onClass(Config.get(name + ".class").asClass());
    } else {
      reflect = Reflect.onClass(clazz);
    }

    boolean isSingleton = Config.get(name + ".singleton").asBoolean(false);

    List> paramTypes = new ArrayList<>();
    List