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From simonetrip...@apache.org
Subject svn commit: r1126882 - /commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java
Date Tue, 24 May 2011 05:58:00 GMT
Author: simonetripodi
Date: Tue May 24 05:58:00 2011
New Revision: 1126882

URL: http://svn.apache.org/viewvc?rev=1126882&view=rev
Log:
first checkin of AbstractMethodHandler class

Added:
    commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java
  (with props)

Added: commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java
URL: http://svn.apache.org/viewvc/commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java?rev=1126882&view=auto
==============================================================================
--- commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java
(added)
+++ commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java
Tue May 24 05:58:00 2011
@@ -0,0 +1,149 @@
+/* $Id$
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.commons.digester3.annotations.handlers;
+
+import static org.apache.commons.digester3.annotations.utils.AnnotationUtils.*;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+import org.apache.commons.digester3.binder.RulesBinder;
+import org.apache.commons.digester3.annotations.AnnotationHandler;
+import org.apache.commons.digester3.annotations.DigesterRule;
+import org.apache.commons.digester3.annotations.DigesterRuleList;
+import org.apache.commons.digester3.annotations.FromAnnotationsRuleModule;
+import org.apache.commons.digester3.annotations.rules.CreationRule;
+
+/**
+ * Handler that takes care to create the
+ * {@link org.apache.commons.digester3.annotations.rules.SetNext}
+ * and
+ * {@link org.apache.commons.digester3.annotations.rules.SetRoot}.
+ *
+ * @since 3.0
+ */
+abstract class AbstractMethodHandler<A extends Annotation> implements AnnotationHandler<A,
Method> {
+
+    /**
+     * The default args size the method has to have in order to be analyzed.
+     */
+    private static final int SUPPORTED_ARGS = 1;
+
+    /**
+     * {@inheritDoc}
+     */
+    public void handle( A annotation, Method element, RulesBinder rulesBinder )
+    {
+        if ( SUPPORTED_ARGS != element.getParameterTypes().length )
+        {
+            DigesterRule rule = annotation.annotationType().getAnnotation( DigesterRule.class
);
+
+            rulesBinder.addError( "Methods annotated with digester annotation rule @%s must
have just one argument",
+                                  rule.reflectsRule().getName() );
+            return;
+        }
+
+        Object explicitTypesObject = getAnnotationValue( annotation );
+        if ( explicitTypesObject == null || !explicitTypesObject.getClass().isArray()
+            || Class.class != explicitTypesObject.getClass().getComponentType() )
+        {
+            rulesBinder.addError( "Impossible to apply this handler, @%s.value() has to be
of type 'Class<?>[]'",
+                                  annotation.getClass().getName() );
+            return;
+        }
+
+        Class<?>[] explicitTypes = (Class<?>[]) explicitTypesObject;
+        Class<?> paramType = element.getParameterTypes()[0];
+
+        if ( explicitTypes.length > 0 )
+        {
+            for ( Class<?> explicitType : explicitTypes )
+            {
+                if ( !paramType.isAssignableFrom( explicitType ) )
+                {
+                    rulesBinder.addError( "Impossible to handle annotation %s on method,
%s has to be a %s",
+                                          annotation, element.toGenericString(), explicitType.getName(),
+                                          paramType.getName() );
+                    return;
+                }
+
+                doHandle( annotation, element, explicitType, rulesBinder );
+            }
+        }
+        else
+        {
+            doHandle( annotation, element, paramType, rulesBinder );
+        }
+    }
+
+    private void doHandle( A methodAnnotation, Method method, Class<?> type, RulesBinder
rulesBinder )
+    {
+        if ( type.isInterface() && Modifier.isAbstract( type.getModifiers() ) )
+        {
+            rulesBinder.addError( "Impossible to proceed analyzing %s, specified type '%s'
is an interface/abstract",
+                                  methodAnnotation, type.getName() );
+            return;
+        }
+
+        for ( Annotation annotation : type.getAnnotations() )
+        {
+            doHandle( methodAnnotation, annotation, method, type, rulesBinder );
+        }
+    }
+
+    private void doHandle( A methodAnnotation, Annotation annotation, Method method, final
Class<?> type,
+                           RulesBinder rulesBinder )
+    {
+        if ( annotation.annotationType().isAnnotationPresent( DigesterRule.class )
+            && annotation.annotationType().isAnnotationPresent( CreationRule.class
) )
+        {
+            rulesBinder.install( new FromAnnotationsRuleModule()
+            {
+
+                @Override
+                protected void configure()
+                {
+                    bindRulesFrom( type );
+                }
+
+            } );
+
+            String pattern = getAnnotationPattern( annotation );
+            String namespaceURI = getAnnotationNamespaceURI( annotation );
+            doBind( pattern, namespaceURI, method, type, rulesBinder );
+        }
+        else if ( annotation.annotationType().isAnnotationPresent( DigesterRuleList.class
) )
+        {
+            // check if it is one of the *.List annotation
+            Annotation[] annotations = getAnnotationsArrayValue( annotation );
+            if ( annotations != null )
+            {
+                // if it is an annotations array, process them
+                for ( Annotation ptr : annotations )
+                {
+                    doHandle( methodAnnotation, ptr, method, type, rulesBinder );
+                }
+            }
+        }
+    }
+
+    protected abstract void doBind( String pattern, String namespaceURI, Method method, Class<?>
type,
+                                    RulesBinder rulesBinder );
+
+}

Propchange: commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/annotations/handlers/AbstractMethodHandler.java
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