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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.conversion.Cast;
import com.davidbracewell.conversion.Convert;
import com.davidbracewell.logging.Logger;
import com.davidbracewell.tuple.Tuple2;
import com.google.common.base.Preconditions;

import java.lang.reflect.Method;
import java.util.*;
import java.util.stream.Collectors;

/**
 *  A Map based interface for accessing the properties of a bean object. 
  Property information is cached
 * using the {@link BeanDescriptorCache}. 
 *
 * @author David B. Bracewell
 */
public class BeanMap extends AbstractMap {

  private static final Logger log = Logger.getLogger(BeanMap.class);
  private final Object bean;
  private final BeanDescriptor beanDescriptor;

  /**
   * Constructs a bean map for a given bean
   *
   * @param bean The bean
   */
  public BeanMap(Object bean) {
    this.bean = Preconditions.checkNotNull(bean);
    this.beanDescriptor = BeanDescriptorCache.getInstance().get(bean.getClass());
  }


  /**
   * @return The names of the setter methods
   */
  public Set getSetters() {
    return beanDescriptor.getWriteMethodNames();
  }

  /**
   * @return The bean in the bean map
   */
  public Object getBean() {
    return bean;
  }

  @Override
  public boolean containsKey(Object arg0) {
    return beanDescriptor.hasReadMethod(arg0.toString());
  }

  @Override
  public boolean containsValue(Object arg0) {
    for (String key : keySet()) {
      if (arg0.equals(get(key))) {
        return true;
      }
    }
    return false;
  }

  @Override
  public Set> entrySet() {
    return this.keySet().stream()
        .map(key -> Cast.>as(Tuple2.of(key, get(key))))
        .collect(Collectors.toSet());
  }

  @Override
  public Object get(Object arg0) {
    Method m = beanDescriptor.getReadMethod(arg0.toString());
    if (m != null) {
      try {
        return m.invoke(bean);
      } catch (Exception e) {
        log.finest(e);
      }
    }
    return null;
  }

  /**
   * Gets the type of the parameter on the setter method.
   *
   * @param key The setter method
   * @return A Class representing the parameter type of the setter method
   */
  public Class getType(String key) {
    if (beanDescriptor.hasReadMethod(key)) {
      return beanDescriptor.getReadMethod(key).getReturnType();
    } else if (beanDescriptor.hasWriteMethod(key)) {
      Class[] paramTypes = beanDescriptor.getWriteMethod(key).getParameterTypes();
      if (paramTypes.length > 0) {
        return paramTypes[0];
      }
    }
    return null;
  }

  @Override
  public boolean isEmpty() {
    return beanDescriptor.numberOfReadMethods() == 0;
  }

  @Override
  public Set keySet() {
    return beanDescriptor.getReadMethodNames();
  }

  @Override
  public Object put(String arg0, Object arg1) {
    Method m = beanDescriptor.getWriteMethod(arg0);
    if (m != null) {
      try {
        Class clazz = getType(arg0);
        if (clazz.isAssignableFrom(arg1.getClass())) {
          return m.invoke(bean, arg1);
        }
        if (Map.class.isAssignableFrom(clazz)) {
          return m.invoke(bean, Convert.convert(arg1, clazz, Object.class, Object.class));
        } else if (Collection.class.isAssignableFrom(clazz)) {
          return m.invoke(bean, Convert.convert(arg1, clazz, Object.class));
        }
        return m.invoke(bean, Convert.convert(arg1, clazz));
      } catch (Exception e) {
        log.warn(e);
      }
    } else {
      log.finest("{0} is not a setter on {1}.", arg0, bean.getClass());
    }
    return null;
  }

  @Override
  public int size() {
    return beanDescriptor.numberOfReadMethods();
  }

  @Override
  public Collection