PicoContainer example source code file (FieldAnnotationInjector.java)

This example PicoContainer source code file (FieldAnnotationInjector.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 - PicoContainer tags/keywords

arraylist, arraylist, class, field, field, fieldannotationinjector, fieldannotationinjector, invocationtargetexception, lifecyclestrategy, list, object, object, parameter, privilegedaction, reflection, security, util

The PicoContainer FieldAnnotationInjector.java source code

/*****************************************************************************
 * Copyright (C) PicoContainer Organization. All rights reserved.            *
 * ------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the BSD      *
 * style license a copy of which has been included with this distribution in *
 * the LICENSE.txt file.                                                     *
 *                                                                           *
 * Original code by                                                          *
 *****************************************************************************/
package org.picocontainer.injectors;

import org.picocontainer.ComponentMonitor;
import org.picocontainer.annotations.Inject;
import org.picocontainer.LifecycleStrategy;
import org.picocontainer.Parameter;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.List;

public class FieldAnnotationInjector extends SetterInjector {

    public FieldAnnotationInjector(Object key,
                                   Class impl, Parameter[] parameters, ComponentMonitor componentMonitor, LifecycleStrategy lifecycleStrategy) {

        super(key, impl, parameters, componentMonitor, lifecycleStrategy);
    }

    protected void initializeInjectionMembersAndTypeLists() {
        injectionMembers = new ArrayList<Member>();
        final List<Class> typeList = new ArrayList();
        final Field[] fields = getFields();
        for (final Field field : fields) {
            if (isAnnotatedForInjection(field)) {
                injectionMembers.add(field);
                typeList.add(field.getType());
            }
        }
        injectionTypes = typeList.toArray(new Class[0]);
    }

    protected boolean isAnnotatedForInjection(Field field) {
        return field.getAnnotation(Inject.class) != null;
    }

    private Field[] getFields() {
        return (Field[]) AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                return getComponentImplementation().getDeclaredFields();
            }
        });
    }


    protected void injectIntoMember(Member member, Object componentInstance, Object toInject)
        throws IllegalAccessException, InvocationTargetException {
        Field field = (Field) member;
        field.setAccessible(true);
        field.set(componentInstance, toInject);
    }
}