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package org.hisp.dhis.system.deletion;
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* Copyright (c) 2004-2007, University of Oslo
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the HISP project nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.hisp.dhis.common.DeleteNotAllowedException;
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* @author Lars Helge Overland
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public class DefaultDeletionManager
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implements DeletionManager
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private static final Log log = LogFactory.getLog( DefaultDeletionManager.class );
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private static final String DELETE_METHOD_PREFIX = "delete";
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private static final String ALLOW_METHOD_PREFIX = "allowDelete";
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private List<DeletionHandler> handlers = new ArrayList<DeletionHandler>();
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// -------------------------------------------------------------------------
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// DeletionManager implementation
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// -------------------------------------------------------------------------
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public void addDeletionHandler( DeletionHandler handler )
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this.handlers.add( handler );
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public void addDeletionHandlers( Collection<DeletionHandler> deletionHandlers )
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this.handlers.addAll( deletionHandlers );
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@SuppressWarnings( "unchecked" )
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public void execute( Object object )
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Class clazz = object.getClass();
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if ( !clazz.getSuperclass().equals( Object.class ) )
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clazz = clazz.getSuperclass();
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String className = clazz.getSimpleName();
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// ---------------------------------------------------------------------
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// Verify that object is allowed to be deleted
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// ---------------------------------------------------------------------
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String allowMethodName = ALLOW_METHOD_PREFIX + className;
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String currentHandler = null;
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Method allowMethod = DeletionHandler.class.getMethod( allowMethodName, new Class[] { clazz } );
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for ( DeletionHandler handler : handlers )
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currentHandler = handler.getClass().getSimpleName();
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boolean allow = (Boolean) allowMethod.invoke( handler, object );
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throw new DeleteNotAllowedException( DeleteNotAllowedException.ERROR_ASSOCIATED_BY_OTHER_OBJECTS, handler.getClassName() );
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catch ( NoSuchMethodException ex )
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log.error( "Method '" + allowMethodName + "' does not exist on class '" + clazz + "'", ex );
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catch ( IllegalAccessException ex )
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log.error( "Method '" + allowMethodName + "' could not be invoked on DeletionHandler '" + currentHandler + "'", ex );
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catch ( InvocationTargetException ex )
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log.error( "Method '" + allowMethodName + "' threw exception on DeletionHandler '" + currentHandler + "'", ex );
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// ---------------------------------------------------------------------
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// Delete associated objects
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// ---------------------------------------------------------------------
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String deleteMethodName = DELETE_METHOD_PREFIX + className;
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Method deleteMethod = DeletionHandler.class.getMethod( deleteMethodName, new Class[] { clazz } );
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for ( DeletionHandler handler : handlers )
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currentHandler = handler.getClass().getSimpleName();
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deleteMethod.invoke( handler, object );
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catch ( Exception ex )
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log.error( "Failed to invoke method " + deleteMethodName + " on DeletionHandler '" + currentHandler + "'", ex );
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log.info( "Deleted objects associatied with object of type " + className );