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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.Iterator;
+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 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);
+ }
+
+ public boolean hasComponent(Object key) {
+ return components.containsKey(key) || (parent != null && parent.hasComponent(key));
+ }
+
+ public boolean isRunning() {
+ return this.running;
+ }
+
+ 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);
+ }
+
+}