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

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/*
 * Fabric3
 * Copyright (c) 2009-2013 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
 *
 * ----------------------------------------------------
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 *
 */
package org.fabric3.implementation.system.introspection;

import org.oasisopen.sca.annotation.Reference;

import org.fabric3.implementation.system.model.SystemImplementation;
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.ImplementationProcessor;
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.fabric3.spi.model.type.java.InjectingComponentType;

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

    public SystemImplementationProcessorImpl(@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 InjectingComponentType introspect(String className, IntrospectionContext context) {
        SystemImplementation implementation = new SystemImplementation();
        InjectingComponentType componentType = new InjectingComponentType(className);
        componentType.setScope("COMPOSITE");
        implementation.setComponentType(componentType);

        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 componentType;
        }
        if (implClass.isInterface()) {
            InvalidImplementation failure = new InvalidImplementation("Implementation class is an interface", implClass, componentType);
            context.addError(failure);
            return componentType;
        }
        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);
        return componentType;
    }
}