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package eu.etaxonomy.cdm.aspectj;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import org.apache.log4j.Logger;
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import org.aspectj.lang.Signature;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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/**
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* @author markus
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* Aspect class that adds a firePropertyChange call to all setter methods
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* which names start with "set" and that belong to subclasses form CdmBase
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* CdmBase defines the rest of the ProeprtyChangeSupport like listener registration
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*/
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public aspect PropertyChangeAspect {
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static Logger logger = Logger.getLogger(PropertyChangeAspect.class);
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// pointcut execAdder(CdmBase cb): target(cb) && execution(void CdmBase+.add*(..) ); //once implemented we may want to remove addToSetWithChangeEvent and remove... from CdmBase
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pointcut execSetter(CdmBase cb): target(cb) && execution(void CdmBase+.set*(..) );
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// /** *********** OLD ***********************/
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// pointcut callSetter( CdmBase b ) : call( * CdmBase+.set*(..) ) && target( b );
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/**
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* @param cb
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* Around aspect that will be weaven into the original setter methods of the CdmBase derived classes
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*/
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void around( CdmBase cb ) : execSetter( cb ) {
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//logger.setLevel(Level.DEBUG);
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// get property that is set by setter method
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Field property = getFieldOfSetter( thisJoinPointStaticPart.getSignature() );
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if (property==null){
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proceed( cb );
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}else{
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property.setAccessible(true);
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String propertyName = property.getName();
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//logger.debug("execSetter: The property is ["+propertyName+"]");
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try {
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// use property attribute directly, not through get method.
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// get method might modify things, like setting a UUID when called for the first time.
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// Also get methods for booleans start with "is" or "has"
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Object oldValue = property.get(cb);
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proceed( cb );
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Object newValue = property.get(cb);
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// logger.error ("Prop: " + propertyName);
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// logger.warn("OLD:" + oldValue);
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// logger.warn("New:" + newValue);
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if (! isPersistentSet(newValue) && ! isPersistentSet(oldValue) ){
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cb.firePropertyChange( propertyName, oldValue, newValue);
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}
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} catch (NoSuchMethodException e) {
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e.printStackTrace();
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proceed( cb );
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}catch (IllegalArgumentException e) {
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e.printStackTrace();
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proceed( cb );
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}catch (IllegalAccessException e) {
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e.printStackTrace();
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proceed( cb );
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} catch (InvocationTargetException e) {
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e.printStackTrace();
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proceed( cb );
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}
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}
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}
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private boolean isPersistentSet(Object value){
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if (value == null){
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//logger.debug("(null) is not PS");
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return false;
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}else if (value.getClass().getSimpleName().equals("PersistentSet")){
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logger.debug("Don't throw event for setter of Persistent Set");
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return true;
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}else{
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//logger.warn(value.getClass().getSimpleName() + " is is not PS");
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return false;
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}
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}
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/**
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* @param signature
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* Return the Field object that belongs to the signature of a setter method
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* If no matching attribute can be found return null instead of throwing an NoSuchFieldException
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* Removes first 3 characters of method name to find property name
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*/
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private Field getFieldOfSetter( Signature signature ){
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Field field = null;
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String propertyName = "";
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//logger.debug( "Getting the field name of setter ["+signature.getName() + "]" );
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try{
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String methodName = signature.getName();
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propertyName = Character.toLowerCase(methodName.charAt(3)) + methodName.substring(4);
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field = signature.getDeclaringType().getDeclaredField( propertyName );
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}catch( NoSuchFieldException e ){
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try{
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propertyName = "is"+propertyName.substring(0, 1).toUpperCase()+ propertyName.substring(1);
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field = signature.getDeclaringType().getDeclaredField( propertyName );
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}catch( NoSuchFieldException nsfe ){
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// can't find any matching attribute. catch error and return null
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return null;
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}
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}
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return field;
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}
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/**
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* Fires a propertyChange Event
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* @param cb CdmBase that fires that Event
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* @param property the property's name
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* @param oldval the old value
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* @param newval the new value
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*/
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void fireLoggingPropertyChange( CdmBase cb,
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String property,
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Object oldval,
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Object newval) {
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//logger.debug( "PropertyChangeEvent: property [" + property + "], old value [" + oldval + "], new value [" + newval + "]");
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// call firePropertyChange in original class. Method defined in CdmBase superclass!
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cb.firePropertyChange( property,
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( oldval == null ) ? oldval : oldval.toString(),
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( newval == null ) ? newval : newval.toString());
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}
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}
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