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Core contains the base concepts of our approach to RESTful development in Java.

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/**
 * Copyright 2012 Jason Rose 
 *
 * 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.praxissoftware.rest.core;

import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

/**
 * An AbstractMapEntity is a bean that presents the API of a Map. It allows libraries to interact with subclasses either as the subclass type or as a Map type to facilitate reuse.
 * 
 * @see Data is data
 * @author Jason Rose
 * 
 */
public abstract class AbstractMapEntity implements Map {

  private final Map delegate;

  public AbstractMapEntity() {
    this(Maps. newHashMap());
  }

  public AbstractMapEntity(final Map source) {
    if( source instanceof ImmutableMap ) {
      delegate = source;
    } else if( source instanceof SortedMap ) {
      delegate = Maps.newTreeMap((SortedMap) source);
    } else {
      delegate = Maps.newHashMap(source);
    }
  }

  @Override
  public void clear() {
    delegate.clear();
  }

  @Override
  public boolean containsKey(final Object arg0) {
    return delegate.containsKey(arg0);
  }

  @Override
  public boolean containsValue(final Object arg0) {
    return delegate.containsValue(arg0);
  }

  @Override
  public Set> entrySet() {
    return delegate.entrySet();
  }

  @Override
  public boolean equals(final Object object) {
    return delegate.equals(object);
  }

  @Override
  public Object get(final Object arg0) {
    return delegate.get(arg0);
  }

  /**
   * This method sidesteps some of the syntactic nastiness of Java and generics.
   * @param key The key to look for a value to.
   * @return The value, cast as the type expected by the LHS of the expression.
   */
  @SuppressWarnings("unchecked")
  public  T getAndCoerce(final String key) {
    return (T) get(key);
  }

  @Override
  public int hashCode() {
    return delegate.hashCode();
  }

  @Override
  public boolean isEmpty() {
    return delegate.isEmpty();
  }

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

  @Override
  public Object put(final String key, final Object value) {
    final Object output;
    if( value == null ) {
      output = remove(key);
    } else {
      output = delegate.put(key, value);
    }
    return output;
  }

  @Override
  public void putAll(final Map arg0) {
    for( final Map.Entry entry : arg0.entrySet() ) {
      put(entry.getKey(), entry.getValue());
    }
  }

  @Override
  public Object remove(final Object arg0) {
    return delegate.remove(arg0);
  }

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

  @Override
  public String toString() {
    return delegate.toString();
  }

  @Override
  public Collection