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/*
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * 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.drools.runtime.conf;

import org.drools.runtime.process.WorkItemHandler;

/**
 * WorkItemHandlers configuration option
 */
public class WorkItemHandlerOption implements MultiValueKnowledgeSessionOption {

    private static final long serialVersionUID = 510l;

    /**
     * The prefix for the property name for work item handlers
     */
    public static final String PROPERTY_NAME = "drools.workItemHandlers";
    
    /**
     * work item handler name
     */
    private final String name;
    
    /**
     * the accumulate function instance
     */
    private final WorkItemHandler handler;
    
    /**
     * Private constructor to enforce the use of the factory method
     * @param name
     */
    private WorkItemHandlerOption( final String name, final WorkItemHandler handler ) {
        this.name = name;
        this.handler = handler;
    }
    
    /**
     * This is a factory method for this WorkItemHandler configuration.
     * The factory method is a best practice for the case where the 
     * actual object construction is changed in the future.
     * 
     * @param name the name of the work item handler to be configured
     * 
     * @return the actual type safe work item handler configuration.
     */
    public static WorkItemHandlerOption get( final String name, final WorkItemHandler handler ) {
        return new WorkItemHandlerOption( name, handler );
    }
    
    /**
     * {@inheritDoc}
     */
    public String getPropertyName() {
        return PROPERTY_NAME+name;
    }
    
    /**
     * Returns the name of the configured work item handler
     * 
     * @return
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the work item handler instance
     * @return
     */
    public WorkItemHandler getHandler() {
        return handler;
    }
    
    @Override
    public String toString() {
        return "WorkItemHandler( name="+name+" handler="+handler+" )";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((handler == null) ? 0 : handler.getClass().hashCode());
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if ( this == obj ) return true;
        if ( obj == null ) return false;
        if ( getClass() != obj.getClass() ) return false;
        WorkItemHandlerOption other = (WorkItemHandlerOption) obj;
        if ( handler == null ) {
            if ( other.handler != null ) {
                return false;
            }
        } else if ( other.handler == null ) {
            return false;
        } else if ( !handler.getClass().equals( other.handler.getClass() ) ) {
            return false;
        }
        if ( name == null ) {
            if ( other.name != null ) {
                return false;
            }
        } else if ( !name.equals( other.name ) ) {
            return false;
        }
        return true;
    }
}