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/*
* Copyright (c) 2008 Israfil Consulting Services Corporation
* Copyright (c) 2008 Christian Edward Gruber
* All Rights Reserved
*
* This software is licensed under the Berkeley Standard Distribution license,
* (BSD license), as defined below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of Israfil Consulting Services nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* $Id: Copyright.java 618 2008-04-14 14:03:03Z christianedwardgruber $
*/
package net.israfil.foundation.container;
import java.util.HashMap;
import java.util.Map;
import net.israfil.foundation.container.error.ComponentAlreadyRegisteredError;
/**
* A convenience abstract class that implements basic component storage and
* lookup, as well as basic component instance assignment.
*
* @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
*
*/
public abstract class AbstractContainer implements Container {
private final Map<Object, Object> components = new HashMap<>();
private final Container parent;
private boolean running = false;
public AbstractContainer() {
parent = null;
}
public AbstractContainer(Container parent) {
this.parent = parent;
}
protected boolean isStored(Object key) {
return components.containsKey(key);
}
@Override
public boolean hasComponent(Object key) {
return components.containsKey(key) || (parent != null && parent.hasComponent(key));
}
@Override
public boolean isRunning() {
return this.running;
}
@Override
public void start() {
this.running = true;
}
protected Container getParent() { return parent; }
protected Object getStoredComponent(Object key) {
Object result = components.get(key);
if (result == null && parent != null)
result = parent.getComponent(key);
return result;
}
protected void store(Object key, Object component) {
if (hasComponent(key)) {
if (getComponent(key) == component) return;
throw new ComponentAlreadyRegisteredError("Object already registered for key: " + key);
}
components.put(key, component);
}
}
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