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Fabric3 Introspection Implementation.
/*
* See the NOTICE file distributed with this work for information
* regarding copyright ownership. This file is licensed
* 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.fabric3.introspection.impl.annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.lang.reflect.Modifier;
import org.osoa.sca.annotations.Reference;
import org.fabric3.introspection.IntrospectionContext;
import org.fabric3.introspection.IntrospectionHelper;
import org.fabric3.introspection.TypeMapping;
import org.fabric3.introspection.contract.ContractProcessor;
import org.fabric3.introspection.java.AbstractAnnotationProcessor;
import org.fabric3.scdl.ConstructorInjectionSite;
import org.fabric3.scdl.FieldInjectionSite;
import org.fabric3.scdl.Implementation;
import org.fabric3.scdl.InjectingComponentType;
import org.fabric3.scdl.MethodInjectionSite;
import org.fabric3.scdl.Multiplicity;
import org.fabric3.scdl.ReferenceDefinition;
import org.fabric3.scdl.ServiceContract;
/**
* @version $Rev: 4359 $ $Date: 2008-05-26 07:52:15 +0100 (Mon, 26 May 2008) $
*/
public class ReferenceProcessor> extends AbstractAnnotationProcessor {
private final ContractProcessor contractProcessor;
private final IntrospectionHelper helper;
public ReferenceProcessor(@Reference ContractProcessor contractProcessor, @Reference IntrospectionHelper helper) {
super(Reference.class);
this.contractProcessor = contractProcessor;
this.helper = helper;
}
public void visitField(Reference annotation, Field field, I implementation, IntrospectionContext context) {
validate(annotation, field, context);
String name = helper.getSiteName(field, annotation.name());
Type type = field.getGenericType();
FieldInjectionSite site = new FieldInjectionSite(field);
ReferenceDefinition definition = createDefinition(name, annotation.required(), type, context.getTypeMapping(), context);
implementation.getComponentType().add(definition, site);
}
public void visitMethod(Reference annotation, Method method, I implementation, IntrospectionContext context) {
validate(annotation, method, context);
String name = helper.getSiteName(method, annotation.name());
Type type = helper.getGenericType(method);
MethodInjectionSite site = new MethodInjectionSite(method, 0);
ReferenceDefinition definition = createDefinition(name, annotation.required(), type, context.getTypeMapping(), context);
implementation.getComponentType().add(definition, site);
}
private void validate(Reference annotation, Field field, IntrospectionContext context) {
if (!Modifier.isProtected(field.getModifiers()) && !Modifier.isPublic(field.getModifiers())) {
Class clazz = field.getDeclaringClass();
if (annotation.required()) {
InvalidAccessor error =
new InvalidAccessor("Invalid required reference. The field " + field.getName() + " on " + clazz.getName()
+ " is annotated with @Reference and must be public or protected.", clazz);
context.addError(error);
} else {
InvalidAccessor warning =
new InvalidAccessor("Ignoring the field " + field.getName() + " annotated with @Reference on " + clazz.getName()
+ ". References must be public or protected.", clazz);
context.addWarning(warning);
}
}
}
private void validate(Reference annotation, Method method, IntrospectionContext context) {
if (!Modifier.isProtected(method.getModifiers()) && !Modifier.isPublic(method.getModifiers())) {
Class clazz = method.getDeclaringClass();
if (annotation.required()) {
InvalidAccessor error =
new InvalidAccessor("Invalid required reference. The method " + method + " on " + clazz.getName()
+ " is annotated with @Reference and must be public or protected.", clazz);
context.addError(error);
} else {
InvalidAccessor warning =
new InvalidAccessor("Ignoring " + method + " annotated with @Reference. References " + "must be public or protected.", clazz);
context.addWarning(warning);
}
}
}
public void visitConstructorParameter(Reference annotation,
Constructor constructor,
int index,
I implementation,
IntrospectionContext context) {
String name = helper.getSiteName(constructor, index, annotation.name());
Type type = helper.getGenericType(constructor, index);
ConstructorInjectionSite site = new ConstructorInjectionSite(constructor, index);
ReferenceDefinition definition = createDefinition(name, annotation.required(), type, context.getTypeMapping(), context);
implementation.getComponentType().add(definition, site);
}
ReferenceDefinition createDefinition(String name, boolean required, Type type, TypeMapping typeMapping, IntrospectionContext context) {
Type baseType = helper.getBaseType(type, typeMapping);
ServiceContract contract = contractProcessor.introspect(typeMapping, baseType, context);
Multiplicity multiplicity = multiplicity(required, type, typeMapping);
return new ReferenceDefinition(name, contract, multiplicity);
}
/**
* Returns the multiplicity of a type based on whether it describes a single value or a collection.
*
* @param required whether a value must be supplied (implies 1.. multiplicity)
* @param type the multiplicity of a type
* @param typeMapping the current introspection type mapping
* @return the multiplicity of the type
*/
Multiplicity multiplicity(boolean required, Type type, TypeMapping typeMapping) {
if (helper.isManyValued(typeMapping, type)) {
return required ? Multiplicity.ONE_N : Multiplicity.ZERO_N;
} else {
return required ? Multiplicity.ONE_ONE : Multiplicity.ZERO_ONE;
}
}
}