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Micro Distribution of the Payara Project for IBM JDK
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/*
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 *
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 *
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 * 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://glassfish.dev.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.
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 */

package com.sun.enterprise.deployment;

import org.glassfish.deployment.common.Descriptor;

import java.lang.reflect.Method;

/**
 * Deployment object representing the lifecycle-callback.
 *
 * @author Shing Wai Chan
 */
public class LifecycleCallbackDescriptor extends Descriptor {

    private String lifecycleCallbackClass;
    private String lifecycleCallbackMethod;
    private String defaultLifecycleCallbackClass;
    private MetadataSource metadataSource = MetadataSource.XML;
    private boolean requiresInvocationContextArgument = false;

    public enum CallbackType {

        AROUND_CONSTRUCT,
        POST_CONSTRUCT,
        PRE_DESTROY,
        PRE_PASSIVATE,
        POST_ACTIVATE 

    }

    public void setLifecycleCallbackClass(String clazz) {
        lifecycleCallbackClass = clazz;
    }

    public String getLifecycleCallbackClass() {
        if (lifecycleCallbackClass == null || 
            lifecycleCallbackClass.trim().equals("")) {
            return defaultLifecycleCallbackClass;
        } else {
            return lifecycleCallbackClass;
        }
    }

    public void setDefaultLifecycleCallbackClass(String clazz) {
        defaultLifecycleCallbackClass = clazz;
    }

    public String getDefaultLifecycleCallbackClass() {
        return defaultLifecycleCallbackClass;
    }

    public void setLifecycleCallbackMethod(String method) {
        lifecycleCallbackMethod = method;
    }

    public String getLifecycleCallbackMethod() {
        return lifecycleCallbackMethod;
    }

    public boolean isRequiresInvocationContextArgument() {
        return requiresInvocationContextArgument;
    }

    public void setRequiresInvocationContextArgument(boolean requiresInvocationContextArgument) {
        this.requiresInvocationContextArgument = requiresInvocationContextArgument;
    }

    /**
     * Given a classloader, find the Method object corresponding to this
     * lifecycle callback.  
     *
     * @throw Exception if no method found
     */
    public Method getLifecycleCallbackMethodObject(ClassLoader loader) 
        throws Exception {

        Method method = null;

        if( getLifecycleCallbackClass() == null ) {
            throw new IllegalArgumentException("no lifecycle class defined");
        }

        // according to the ejb interceptors spec the around invoke and life cycle methods can be on the super class.
        Class clazz = loader.loadClass(getLifecycleCallbackClass());
        
        while ( method == null && ! clazz.equals( Object.class ) ) {
            for(Method next : clazz.getDeclaredMethods()) {
                if( next.getName().equals(lifecycleCallbackMethod) ) {
                    if ( !requiresInvocationContextArgument
                           || (next.getParameterTypes().length == 1 
                               && "javax.interceptor.InvocationContext".equals(next.getParameterTypes()[0].getName()))) {
                        method = next;
                        break;
                    }
                }
            }
            if ( method == null ) {
                clazz = clazz.getSuperclass();
            }
        }

        if( method == null ) {
            throw new NoSuchMethodException("no method matching " + lifecycleCallbackMethod);
        }

        return method;
    }

    public MetadataSource getMetadataSource() {
        return metadataSource;
    }

    public void setMetadataSource(MetadataSource metadataSource) {
        this.metadataSource = metadataSource;
    }
}