com.trickl.crawler.handle.BeanMemberHandler.java Source code

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Here is the source code for com.trickl.crawler.handle.BeanMemberHandler.java

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/*
 * 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 com.trickl.crawler.handle;

import com.trickl.crawler.api.Task;
import java.io.IOException;
import java.util.logging.Level;
import org.apache.commons.beanutils.BeanMap;
import org.apache.droids.exception.DroidsException;

public class BeanMemberHandler<T extends Task, BeanType, BeanMemberType> implements TaskResultHandler<T, BeanType> {
    private String propertyName = "result";

    private TaskResultHandler<T, BeanMemberType> outputHandler;

    public BeanMemberHandler() {
    }

    @SuppressWarnings("unchecked")
    @Override
    public void handle(T task, BeanType bean) throws DroidsException, IOException {
        if (task == null || bean == null)
            throw new NullPointerException();

        if (outputHandler != null) {
            BeanMap beanMap = new BeanMap(bean);
            BeanMemberType beanMember = (BeanMemberType) beanMap.get(propertyName);

            if (beanMember == null) {
                throw new DroidsException("Bean does not contain a value for member '" + propertyName + "'");
            }
            outputHandler.handle(task, beanMember);
        }
    }

    public void setOutputHandler(TaskResultHandler<T, BeanMemberType> outputHandler) {
        this.outputHandler = outputHandler;
    }

    /**
     * @return the propertyName
     */
    public String getPropertyName() {
        return propertyName;
    }

    /**
     * @param propertyName the propertyName to set
     */
    public void setPropertyName(String propertyName) {
        this.propertyName = propertyName;
    }
}