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This project provides common utitlities to for POJOs.
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/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0 */
package net.sf.mmm.util.pojo.base;

import java.lang.reflect.Type;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.inject.Inject;

import net.sf.mmm.util.collection.base.HashKey;
import net.sf.mmm.util.component.base.AbstractComponent;
import net.sf.mmm.util.filter.api.Filter;
import net.sf.mmm.util.pojo.api.PojoUtil;
import net.sf.mmm.util.pojo.descriptor.api.PojoDescriptor;
import net.sf.mmm.util.pojo.descriptor.api.PojoDescriptorBuilder;
import net.sf.mmm.util.pojo.descriptor.api.PojoDescriptorBuilderFactory;
import net.sf.mmm.util.pojo.descriptor.api.PojoPropertyDescriptor;
import net.sf.mmm.util.pojo.descriptor.api.accessor.PojoPropertyAccessorNonArg;
import net.sf.mmm.util.pojo.descriptor.api.accessor.PojoPropertyAccessorNonArgMode;
import net.sf.mmm.util.pojo.descriptor.impl.PojoDescriptorBuilderFactoryImpl;

/**
 * This class is a collection of utility functions for dealing with {@link java.lang.reflect reflection}.
 *
 * @see #getInstance()
 *
 * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
 * @since 7.1.0
 */
public class PojoUtilImpl extends AbstractComponent implements PojoUtil {

  private static PojoUtil instance;

  private PojoDescriptorBuilderFactory pojoDescriptorBuilderFactory;

  private PojoDescriptorBuilder pojoDescriptorBuilder;

  /**
   * The constructor.
   */
  public PojoUtilImpl() {

    super();
  }

  /**
   * This method gets the singleton instance of this {@link PojoUtil}. 

   * ATTENTION:

   * Please prefer dependency-injection instead of using this method.
   *
   * @return the singleton instance.
   */
  public static PojoUtil getInstance() {

    if (instance == null) {
      PojoUtilImpl impl = null;
      synchronized (PojoUtilImpl.class) {
        if (instance == null) {
          impl = new PojoUtilImpl();
          impl.initialize();
          instance = impl;
        }
      }
    }
    return instance;
  }

  @Override
  protected void doInitialized() {

    super.doInitialized();
    if (instance == null) {
      instance = this;
    }
  }

  @Override
  protected void doInitialize() {

    super.doInitialize();
    if (this.pojoDescriptorBuilderFactory == null) {
      this.pojoDescriptorBuilderFactory = PojoDescriptorBuilderFactoryImpl.getInstance();
    }
    if (this.pojoDescriptorBuilder == null) {
      this.pojoDescriptorBuilder = this.pojoDescriptorBuilderFactory.createPrivateFieldDescriptorBuilder();
    }
  }

  /**
   * @return the instance of {@link PojoDescriptorBuilderFactory}.
   */
  protected PojoDescriptorBuilderFactory getPojoDescriptorBuilderFactory() {

    return this.pojoDescriptorBuilderFactory;
  }

  /**
   * @param pojoDescriptorBuilderFactory is the instance of {@link PojoDescriptorBuilderFactory} to
   *        {@link Inject}.
   */
  @Inject
  public void setPojoDescriptorBuilderFactory(PojoDescriptorBuilderFactory pojoDescriptorBuilderFactory) {

    getInitializationState().requireNotInitilized();
    this.pojoDescriptorBuilderFactory = pojoDescriptorBuilderFactory;
  }

  /**
   * @return the {@link PojoDescriptorBuilder}.
   */
  protected PojoDescriptorBuilder getPojoDescriptorBuilder() {

    return this.pojoDescriptorBuilder;
  }

  /**
   * @param pojoDescriptorBuilder is the {@link PojoDescriptorBuilder} to set.
   */
  public void setPojoDescriptorBuilder(PojoDescriptorBuilder pojoDescriptorBuilder) {

    this.pojoDescriptorBuilder = pojoDescriptorBuilder;
  }

  @Override
  public void visitObjectRecursive(Object object, Filter