1 files changed, 151 insertions, 0 deletions
diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/InfoboxFactory.java b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/InfoboxFactory.java
new file mode 100644
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--- /dev/null
+++ b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/InfoboxFactory.java
@@ -0,0 +1,151 @@
+/*
+* Copyright 2008 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* 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 at.gv.egiz.bku.slcommands.impl;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import at.gv.egiz.bku.slexceptions.SLCommandException;
+import at.gv.egiz.bku.slexceptions.SLExceptionMessages;
+import at.gv.egiz.bku.slexceptions.SLRuntimeException;
+
+/**
+ * A factory for creating {@link Infobox}es.
+ * 
+ * @author mcentner
+ */
+public class InfoboxFactory {
+  
+  /**
+   * Logging facility.
+   */
+  private static Log log = LogFactory.getLog(InfoboxFactory.class);
+  
+  /**
+   * The singleton instance of this InfoboxFactory.
+   */
+  private static InfoboxFactory instance;
+
+  /**
+   * @return an instance of this InfoboxFactory
+   */
+  public synchronized static InfoboxFactory getInstance() {
+    if (instance == null) {
+      instance = new InfoboxFactory();
+    }
+    return instance;
+  }
+ 
+  /**
+   * The mapping of infobox identifier to implementation class.
+   */
+  private HashMap<String, Class<? extends Infobox>> implementations;
+
+  /**
+   * Private constructor.
+   */
+  private InfoboxFactory() {
+  }
+
+  /**
+   * Sets the mapping of infobox identifier to implementation class name.
+   * 
+   * @param infoboxImplMap
+   *          a mapping of infobox identifiers to implementation class names
+   * 
+   * @throws ClassNotFoundException
+   *           if implementation class is not an instance of {@link Infobox}
+   */
+  @SuppressWarnings("unchecked")
+  public void setInfoboxImpl(Map<String, String> infoboxImplMap) throws ClassNotFoundException {
+    HashMap<String, Class<? extends Infobox>> implMap = new HashMap<String, Class<? extends Infobox>>();
+    ClassLoader cl = getClass().getClassLoader();
+    for (String key : infoboxImplMap.keySet()) {
+      Class<? extends Infobox> impl = (Class<? extends Infobox>) cl.loadClass(infoboxImplMap.get(key));
+      log.debug("Registering infobox '" + key + "' implementation '" + impl.getCanonicalName() + "'.");
+      implementations.put(key, impl);
+    }
+    implementations = implMap;
+  }
+
+  /**
+   * Returns the configured implementation class for the given
+   * <code>infoboxIdentifier</code>.
+   * 
+   * @param infoboxIdentifier
+   *          the infobox identifier
+   * 
+   * @return the implementation class for the given infobox identifier or
+   *         <code>null</code> if there is no implementation class configured
+   */
+  public Class<? extends Infobox> getImplClass(String infoboxIdentifier) {
+    if (implementations != null) {
+      return implementations.get(infoboxIdentifier);
+    } else {
+      return null;
+    }
+  }
+
+  /**
+   * Create a new {@link Infobox} instance for the given
+   * <code>infoboxIdentifier</code>.
+   * 
+   * @param infoboxIdentifier
+   *          the infobox identifier
+   * 
+   * @return an {@link Infobox} implementation for the given infobox identifier
+   * 
+   * @throws SLCommandException
+   *           if there is no implementation for the given infobox identifier
+   * @throws SLRuntimeException
+   *           if creating an {@link Infobox} instance fails
+   */
+  public Infobox createInfobox(String infoboxIdentifier) throws SLCommandException, SLRuntimeException {
+    
+    Class<? extends Infobox> implClass = getImplClass(infoboxIdentifier);
+    if (implClass == null) {
+      // infobox not supported
+      log.info("Unsupported infobox '" + infoboxIdentifier + ".");
+      throw new SLCommandException(4002,
+          SLExceptionMessages.EC4002_INFOBOX_UNKNOWN,
+          new Object[] { infoboxIdentifier });
+    }
+    
+    // try to instantiate
+    Infobox infobox;
+    try {
+      infobox = implClass.newInstance();
+      log.debug("Infobox '" + infobox.getIdentifier() + "' created.");
+    } catch (InstantiationException e) {
+      // unexpected error
+      log.error("Failed to instantiate infobox implementation.", e);
+      throw new SLRuntimeException(e);
+    } catch (IllegalAccessException e) {
+      // unexpected error
+      log.error("Failed to instantiate infobox implementation.", e);
+      throw new SLRuntimeException(e);
+    }
+    
+    return infobox;
+    
+  }
+  
+
+}