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• ResourceFactory.java

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com.sun.jersey.server.impl.component.ResourceFactory Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package com.sun.jersey.server.impl.component;

import com.sun.jersey.server.spi.component.*;
import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.api.core.ResourceConfig;
import com.sun.jersey.core.reflection.ReflectionHelper;
import com.sun.jersey.core.spi.component.ComponentConstructor;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentInjector;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.server.impl.inject.ServerInjectableProviderContext;
import com.sun.jersey.server.impl.resource.PerRequestFactory;
import com.sun.jersey.spi.inject.Errors;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author [email protected]
 */
public class ResourceFactory {
    private final ResourceConfig config;

    private final ServerInjectableProviderContext ipc;

    private final Map factories;
    
    public ResourceFactory(ResourceConfig config, ServerInjectableProviderContext ipc) {
        this.config = config;
        this.ipc = ipc;
        this.factories = new HashMap();
    }

    public ServerInjectableProviderContext getInjectableProviderContext() {
        return ipc;
    }

    public ComponentScope getScope(Class c) {
        return getComponentProviderFactory(c).getScope(c);
    }

    public ResourceComponentProvider getComponentProvider(ComponentContext cc, Class c) {
        return getComponentProviderFactory(c).getComponentProvider(c);
    }

    protected ResourceComponentProviderFactory getComponentProviderFactory(Class c) {
        Class providerFactoryClass = null;
        Class scope = null;

        // Use annotations to identify the correct provider, note that
        // @ResourceComponentProviderClass is a meta-annotation so we look for annotations
        // on the annotations of the resource class
        for (Annotation a: c.getAnnotations()) {
            Class annotationType = a.annotationType();
            ResourceComponentProviderFactoryClass rf = annotationType.getAnnotation(
                    ResourceComponentProviderFactoryClass.class);
            if (rf != null && providerFactoryClass == null) {
                providerFactoryClass = rf.value();
                scope = annotationType;
            }  else if (rf != null && providerFactoryClass != null) {
                Errors.error("Class " + c.getName() + " is annotated with multiple scopes: "
                        + scope.getName() + " and " + annotationType.getName());
            }
        }

        if (providerFactoryClass == null) {
            Object v = config.getProperties().
                    get(ResourceConfig.PROPERTY_DEFAULT_RESOURCE_COMPONENT_PROVIDER_FACTORY_CLASS);
            if (v == null) {
                // Use default provider if none specified
                providerFactoryClass = PerRequestFactory.class;
            } else if (v instanceof String) {
                try {
                    providerFactoryClass = getSubclass(ReflectionHelper.classForNameWithException((String)v));
                } catch (ClassNotFoundException ex) {
                    throw new ContainerException(ex);
                }
            } else if (v instanceof Class) {
                providerFactoryClass = getSubclass((Class)v);
            } else {
                throw new IllegalArgumentException("Property value for "
                        + ResourceConfig.PROPERTY_DEFAULT_RESOURCE_COMPONENT_PROVIDER_FACTORY_CLASS
                        + " of type Class or String");
            }
        }

        ResourceComponentProviderFactory rcpf = factories.get(providerFactoryClass);
        if (rcpf == null) {
            rcpf = getInstance(providerFactoryClass);
            factories.put(providerFactoryClass, rcpf);
        }

        return rcpf;
    }

    private Class getSubclass(Class c) {
        if (ResourceComponentProviderFactory.class.isAssignableFrom(c)) {
            return c.asSubclass(ResourceComponentProviderFactory.class);
        } else {
            throw new IllegalArgumentException("Property value for "
                    + ResourceConfig.PROPERTY_DEFAULT_RESOURCE_COMPONENT_PROVIDER_FACTORY_CLASS
                    + " of type " + c + " not of a subclass of " + ResourceComponentProviderFactory.class);
        }

    }

    private ResourceComponentProviderFactory getInstance(
            Class providerFactoryClass) {
        try {
            ComponentInjector ci =
                    new ComponentInjector(ipc, providerFactoryClass);

            ComponentConstructor cc =
                    new ComponentConstructor(ipc, providerFactoryClass, ci);

            return cc.getInstance();
        } catch (Exception ex) {
            throw new ContainerException("Unable to create resource component provider", ex);
        }
    }
}