injectableproviderfactory.java

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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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 https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/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 jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
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 * 
 * 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
 * holder.
 */
package com.sun.jersey.impl.application;

import com.sun.jersey.spi.resource.InjectableProviderContext;
import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.api.model.Parameter;
import com.sun.jersey.impl.model.ReflectionHelper;
import com.sun.jersey.impl.modelapi.annotation.AnnotatedMethod;
import com.sun.jersey.impl.modelapi.annotation.MethodList;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.service.ComponentContext;
import com.sun.jersey.spi.inject.InjectableProvider;
import com.sun.jersey.spi.service.ComponentProvider.Scope;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.logging.Logger;
import javax.ws.rs.HttpMethod;
import javax.ws.rs.Path;

/**
 *
 * @author [e-mail]
 */
public final class InjectableProviderFactory implements InjectableProviderContext {
    
    private static final Logger LOGGER = Logger.getLogger(InjectableProviderFactory.class.getName());    
    
    private static final class MetaInjectableProvider {
        final InjectableProvider ip;
        final Class<? extends Annotation> ac;
        final Class<?> cc;
        
        MetaInjectableProvider(
                InjectableProvider ip,
                Class<? extends Annotation> ac, 
                Class<?> cc) {
            this.ip = ip;
            this.ac = ac;
            this.cc = cc;
        }
    }
    
    private Map<Class<? extends Annotation>, LinkedList<MetaInjectableProvider>> ipm = 
            new HashMap<Class<? extends Annotation>, LinkedList<MetaInjectableProvider>>();
        
    @SuppressWarnings("unchecked")
    public void add(InjectableProvider ip) {
        Type[] args = getMetaArguments(ip.getClass());
        if (args != null) {
            MetaInjectableProvider mip = new MetaInjectableProvider(ip, 
                    (Class)args[0], (Class)args[1]);
            
            // TODO change to add first
            getList(mip.ac).add(mip);
        } else {
            // TODO throw exception or log error            
        }
    }

    public void configure(ComponentProviderCache componentProviderCache) {
        for (InjectableProvider ip : 
            componentProviderCache.getProvidersAndServices(InjectableProvider.class)) {
            add(ip);
        }
    }
    
    private LinkedList<MetaInjectableProvider> getList(Class<? extends Annotation> c) {
        LinkedList<MetaInjectableProvider> l = ipm.get(c);
        if (l == null) {
            l = new LinkedList<MetaInjectableProvider>();
            ipm.put(c, l);
        }
        return l;
    }
    
    private Type[] getMetaArguments(Class<? extends InjectableProvider> c) {
        Class _c = c;
        while (_c != Object.class) {
            Type[] ts = _c.getGenericInterfaces();
            for (Type t : ts) {
                if (t instanceof ParameterizedType) {
                    ParameterizedType pt = (ParameterizedType)t;
                    if (pt.getRawType() == InjectableProvider.class) {
                        Type[] args = pt.getActualTypeArguments();
                        for (int i = 0; i < args.length; i++)
                            args[i] = getResolvedType(args[i], c, _c);
                            
                        if (args[0] instanceof Class &&
                                args[1] instanceof Class &&
                                (args[1] == Type.class || args[1] == Parameter.class))
                            return args;
                    }
                }
            }
            
            _c = _c.getSuperclass();
        }
        
        return null;        
    }
    
    private Type getResolvedType(Type t, Class c, Class dc) {
        if (t instanceof Class)
            return t;
        else if (t instanceof TypeVariable) {
            ReflectionHelper.ClassTypePair ct = ReflectionHelper.
                    resolveTypeVariable(c, dc, (TypeVariable)t);
            if (ct != null)
                return ct.c;
            else 
                return t;
        } else if (t instanceof ParameterizedType) {
            ParameterizedType pt = (ParameterizedType)t;
            return pt.getRawType();
        } else
            return t;
    }
    
    private List<MetaInjectableProvider> findInjectableProviders(
            Class<? extends Annotation> ac, 
            Class<?> cc,
            Scope s) {
        List<MetaInjectableProvider> subips = new ArrayList<MetaInjectableProvider>();        
        for (MetaInjectableProvider i : getList(ac)) {
            if (s == i.ip.getScope()) {
                if (i.cc.isAssignableFrom(cc)) {
                    subips.add(i);                        
                }
            }
        }
        
        return subips;    
    }
    
    // InjectableProviderContext

    public <A extends Annotation, C> Injectable getInjectable(
            Class<? extends Annotation> ac,             
            ComponentContext ic,
            A a,
            C c,
            Scope s) {
        return getInjectable(ac, ic, a, c, Collections.singletonList(s));
    }
    
    public <A extends Annotation, C> Injectable getInjectable(
            Class<? extends Annotation> ac,             
            ComponentContext ic,
            A a,
            C c,
            List<Scope> ls) {
        for (Scope s : ls) {
            Injectable i = _getInjectable(ac, ic, a, c, s);
            if (i != null)
                return i;
            else {
                // TODO log warnings if injection cannot be performed
                // This is a little tricky for injection of 
                // ContextResolver<JAXBContext> as it is meant to be null 
                // or an aggregation.
                // LOGGER.warning(ic.getAccesibleObject().toString());
            }
        }
        
        return null;
    }
    
    @SuppressWarnings("unchecked")
    private <A extends Annotation, C> Injectable _getInjectable(
            Class<? extends Annotation> ac,             
            ComponentContext ic,
            A a,
            C c,
            Scope s) {
        for (MetaInjectableProvider mip : findInjectableProviders(ac, c.getClass(), s)) {
            Injectable i = mip.ip.getInjectable(ic, a, c);
            if (i != null)
                return i;
        }
        return null;
    }
    
    public Injectable getInjectable(Parameter p) {