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Diffstat (limited to 'israfil-foundation-container/src/main/java/net/israfil/foundation/container/AbstractContainer.java')
| -rw-r--r-- | israfil-foundation-container/src/main/java/net/israfil/foundation/container/AbstractContainer.java | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/israfil-foundation-container/src/main/java/net/israfil/foundation/container/AbstractContainer.java b/israfil-foundation-container/src/main/java/net/israfil/foundation/container/AbstractContainer.java new file mode 100644 index 0000000..fe6a978 --- /dev/null +++ b/israfil-foundation-container/src/main/java/net/israfil/foundation/container/AbstractContainer.java @@ -0,0 +1,98 @@ +/* + * 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); + } + +} |
