Jetty example source code file (InjectionCollection.java)

This example Jetty source code file (InjectionCollection.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

arraylist, arraylist, class, class, field, hashmap, injection, injection, injectioncollection, list, list, map, member, method, reflection, util

The Jetty InjectionCollection.java source code

//========================================================================
//$Id: InjectionCollection.java 1540 2007-01-19 12:24:10Z janb $
//Copyright 2006 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//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.
//========================================================================

package org.mortbay.jetty.plus.annotation;

import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.mortbay.log.Log;

/**
 * InjectionCollection
 *
 *
 */
public class InjectionCollection
{
    private HashMap fieldInjectionsMap = new HashMap();//map of classname to field injections
    private HashMap methodInjectionsMap = new HashMap();//map of classname to method injections
    
    
    public void add (Injection injection)
    {
        if ((injection==null) || (injection.getTarget()==null) || (injection.getTargetClass()==null)) 
            return;
        
        if (Log.isDebugEnabled())
            Log.debug("Adding injection for class="+injection.getTargetClass()+ " on a "+injection.getTarget());
        Map injectionsMap = null;
        if (injection.getTarget() instanceof Field)
            injectionsMap = fieldInjectionsMap;
        if (injection.getTarget() instanceof Method)
            injectionsMap = methodInjectionsMap;
        
        List injections = (List)injectionsMap.get(injection.getTargetClass());
        if (injections==null)
        {
            injections = new ArrayList();
            injectionsMap.put(injection.getTargetClass(), injections);
        }
        
        injections.add(injection);
    }

    public List getFieldInjections (Class clazz)
    {
        if (clazz==null)
            return null;
        List list = (List)fieldInjectionsMap.get(clazz);
        return (list==null?Collections.EMPTY_LIST:list);
    }
    
    public List getMethodInjections (Class clazz)
    {
        if (clazz==null)
            return null;
        List list = (List)methodInjectionsMap.get(clazz);
        return (list==null?Collections.EMPTY_LIST:list);
    }
 
    public List getInjections (Class clazz)
    {
        if (clazz==null)
            return null;
        
        List results = new ArrayList();
        results.addAll(getFieldInjections(clazz));
        results.addAll(getMethodInjections(clazz));
        return results;
    }
    
    public Injection getInjection (Class clazz, Member member)
    {
        if (clazz==null)
            return null;
        if (member==null)
            return null;
        Map map = null;
        if (member instanceof Field)
            map = fieldInjectionsMap;
        else if (member instanceof Method)
            map = methodInjectionsMap;
        
        if (map==null)
            return null;
        
        List injections = (List)map.get(clazz);
        Injection injection = null;
        for (int i=0;injections!=null && i<injections.size() && injection==null;i++)
        {
            Injection candidate = (Injection)injections.get(i);
            if (candidate.getTarget().equals(member))
                injection = candidate;
        }
        return injection;
    }
    
    
    public void inject (Object injectable)
    throws Exception
    {
        if (injectable==null)
            return;

        //Do field injections
        List list = getFieldInjections(injectable.getClass());
        for (int i=0; list!=null && i<list.size();i++)        
            ((Injection)list.get(i)).inject(injectable);
        
        //Do method injections
        list = getMethodInjections(injectable.getClass());
        for (int i=0; list!=null && i<list.size();i++)
            ((Injection)list.get(i)).inject(injectable);
    }
}