org.fabric3.implementation.system.introspection.SystemImplementationIntrospectorImpl Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of fabric3-system Show documentation
Fabric3
The newest version!
/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.implementation.system.introspection;

import org.fabric3.api.model.type.java.InjectingComponentType;
import org.fabric3.spi.introspection.ImplementationNotFoundException;
import org.fabric3.spi.introspection.IntrospectionContext;
import org.fabric3.spi.introspection.TypeMapping;
import org.fabric3.spi.introspection.java.HeuristicProcessor;
import org.fabric3.spi.introspection.java.ImplementationIntrospector;
import org.fabric3.spi.introspection.java.IntrospectionHelper;
import org.fabric3.spi.introspection.java.InvalidImplementation;
import org.fabric3.spi.introspection.java.MissingResource;
import org.fabric3.spi.introspection.java.annotation.ClassVisitor;
import org.oasisopen.sca.annotation.Reference;

/**
 * Loads a system component type
 */
public class SystemImplementationIntrospectorImpl implements ImplementationIntrospector {
    private final ClassVisitor classVisitor;
    private final HeuristicProcessor heuristic;
    private final IntrospectionHelper helper;

    public SystemImplementationIntrospectorImpl(@Reference(name = "classVisitor") ClassVisitor classVisitor,
                                                @Reference(name = "heuristic") HeuristicProcessor heuristic,
                                                @Reference(name = "helper") IntrospectionHelper helper) {
        this.classVisitor = classVisitor;
        this.heuristic = heuristic;
        this.helper = helper;
    }

    public void introspect(InjectingComponentType componentType, IntrospectionContext context) {
        String className = componentType.getImplClass();
        componentType.setScope("COMPOSITE");

        ClassLoader cl = context.getClassLoader();
        Class implClass;
        try {
            implClass = helper.loadClass(className, cl);
        } catch (ImplementationNotFoundException e) {
            Throwable cause = e.getCause();
            if (cause instanceof ClassNotFoundException || cause instanceof NoClassDefFoundError) {
                // CNFE and NCDFE may be thrown as a result of a referenced class not being on the classpath
                // If this is the case, ensure the correct class name is reported, not just the implementation
                String message = e.getCause().getMessage();
                context.addError(new MissingResource("Class referenced from system implementation not found on classpath", message, componentType));
            } else {
                context.addError(new MissingResource("System implementation class not found on classpath", className, componentType));
            }
            return;
        }
        if (implClass.isInterface()) {
            InvalidImplementation failure = new InvalidImplementation("Implementation class is an interface", implClass, componentType);
            context.addError(failure);
            return;
        }
        TypeMapping mapping = context.getTypeMapping(implClass);
        if (mapping == null) {
            mapping = new TypeMapping();
            context.addTypeMapping(implClass, mapping);
            helper.resolveTypeParameters(implClass, mapping);
        }

        classVisitor.visit(componentType, implClass, context);

        heuristic.applyHeuristics(componentType, implClass, context);
    }
}