PicoContainer example source code file (AdaptiveInjectionFactory.java)

This example PicoContainer source code file (AdaptiveInjectionFactory.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

class, componentadapter, componentadapter, componentmonitor, field, io, lifecyclestrategy, lifecyclestrategy, method, object, object, parameter, parameter, properties, reflection, serializable, util

The PicoContainer AdaptiveInjectionFactory.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.                                                     *
 *                                                                           *
 * Idea by Rachel Davies, Original code by Aslak Hellesoy and Paul Hammant   *
 *****************************************************************************/

package org.picocontainer.injectors;

import org.picocontainer.ComponentAdapter;
import org.picocontainer.ComponentMonitor;
import org.picocontainer.Parameter;
import org.picocontainer.PicoCompositionException;
import org.picocontainer.Characteristics;
import org.picocontainer.LifecycleStrategy;
import org.picocontainer.InjectionFactory;
import org.picocontainer.behaviors.AbstractBehaviorFactory;
import org.picocontainer.annotations.Inject;

import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Properties;

/**
 * Creates instances Injectors, depending on whether the component is the presence of Annotations and characteristics.
 *
 * @author Paul Hammant
 * @version $Revision: 3660 $
 */
public class AdaptiveInjectionFactory implements InjectionFactory, Serializable {

    public ComponentAdapter createComponentAdapter(ComponentMonitor componentMonitor,
                                                   LifecycleStrategy lifecycleStrategy,
                                                   Properties componentProperties,
                                                   Object componentKey,
                                                   Class componentImplementation,
                                                   Parameter... parameters) throws PicoCompositionException {
        ComponentAdapter componentAdapter = null;
        componentAdapter = makeIfFieldAnnotationInjection(componentImplementation,
                               componentMonitor,
                               lifecycleStrategy,
                               componentProperties,
                               componentKey,
                               componentAdapter,
                               parameters);

        if (componentAdapter != null) {
            return componentAdapter;
        }


        componentAdapter = makeIfMethodAnnotationInjection(componentImplementation,
                                                           componentMonitor,
                                                           lifecycleStrategy,
                                                           componentProperties,
                                                           componentKey,
                                                           componentAdapter,
                                                           parameters);

        if (componentAdapter != null) {
            return componentAdapter;
        }

        componentAdapter = makeIfSetterInjection(componentProperties,
                                                 componentMonitor,
                                                 lifecycleStrategy,
                                                 componentKey,
                                                 componentImplementation,
                                                 componentAdapter,
                                                 parameters);

        if (componentAdapter != null) {
            return componentAdapter;
        }


        return makeDefaultInjection(componentProperties,
                                    componentMonitor,
                                    lifecycleStrategy,
                                    componentKey,
                                    componentImplementation,
                                    parameters);
    }

    protected ComponentAdapter makeDefaultInjection(Properties componentProperties,
                                                  ComponentMonitor componentMonitor,
                                                  LifecycleStrategy lifecycleStrategy,
                                                  Object componentKey,
                                                  Class componentImplementation, Parameter... parameters)
    {
        AbstractBehaviorFactory.removePropertiesIfPresent(componentProperties, Characteristics.CDI);
        return new ConstructorInjectionFactory().createComponentAdapter(componentMonitor,
                                                                        lifecycleStrategy,
                                                                        componentProperties,
                                                                        componentKey,
                                                                        componentImplementation,
                                                                        parameters);
    }

    protected ComponentAdapter makeIfSetterInjection(Properties componentProperties,
                                                   ComponentMonitor componentMonitor,
                                                   LifecycleStrategy lifecycleStrategy,
                                                   Object componentKey,
                                                   Class componentImplementation,
                                                   ComponentAdapter componentAdapter,
                                                   Parameter... parameters)
    {
        if (AbstractBehaviorFactory.removePropertiesIfPresent(componentProperties, Characteristics.SDI)) {
            componentAdapter = new SetterInjectionFactory().createComponentAdapter(componentMonitor,
                                                                                                    lifecycleStrategy,
                                                                                                    componentProperties,
                                                                                                    componentKey,
                                                                                                    componentImplementation,
                                                                                                    parameters);
        }
        return componentAdapter;
    }

    protected ComponentAdapter makeIfMethodAnnotationInjection(Class componentImplementation,
                                                             ComponentMonitor componentMonitor,
                                                             LifecycleStrategy lifecycleStrategy,
                                                             Properties componentProperties,
                                                             Object componentKey,
                                                             ComponentAdapter componentAdapter,
                                                             Parameter... parameters)
    {
        if (isMethodAnnotationInjection(componentImplementation)) {
            componentAdapter =
                new MethodAnnotationInjectionFactory().createComponentAdapter(componentMonitor,
                                                                              lifecycleStrategy,
                                                                              componentProperties,
                                                                              componentKey,
                                                                              componentImplementation,
                                                                              parameters);
        }
        return componentAdapter;
    }

    protected ComponentAdapter makeIfFieldAnnotationInjection(Class componentImplementation,
                                 ComponentMonitor componentMonitor,
                                 LifecycleStrategy lifecycleStrategy,
                                 Properties componentProperties,
                                 Object componentKey, ComponentAdapter componentAdapter, Parameter... parameters)
    {
        if (isFieldAnnotationInjection(componentImplementation)) {
             componentAdapter =
                new FieldAnnotationInjectionFactory().createComponentAdapter(componentMonitor,
                                                                             lifecycleStrategy,
                                                                             componentProperties,
                                                                             componentKey,
                                                                             componentImplementation,
                                                                             parameters);
        }
        return componentAdapter;
    }

    protected boolean isMethodAnnotationInjection(Class componentImplementation) {
        Method[] methods = componentImplementation.getDeclaredMethods();
        for (Method method : methods) {
            if (method.getAnnotation(Inject.class) != null) {
                return true;
            }
        }
        return false;
    }

    protected boolean isFieldAnnotationInjection(Class componentImplementation) {
        Field[] fields = componentImplementation.getDeclaredFields();
        for (Field field : fields) {
            if (field.getAnnotation(Inject.class) != null) {
                return true;
            }
        }
        return false;
    }

}