/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.storm.trident.operation.builtin;

import org.apache.storm.trident.operation.BaseFilter;
import org.apache.storm.trident.tuple.TridentTuple;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Date;

/**
 * Filter for debugging purposes. The `isKeep()` method simply prints the tuple to `System.out` and returns `true`.
 */
public class Debug extends BaseFilter {
    private final Logger LOG = LoggerFactory.getLogger(Debug.class);

    private final String name;
    private boolean useLogger;

    public Debug() {
        this(false);
    }

    public Debug(boolean useLogger) {
        this.useLogger = useLogger;
        this.name = "DEBUG: ";
    }

    /**
     * Creates a `Debug` filter with a string identifier.
     * @param name
     */
    public Debug(String name) {
        this.name = "DEBUG(" + name + "): ";
    }

    @Override
    public boolean isKeep(TridentTuple tuple) {
        if(useLogger) {
            LOG.debug(tuple.toString());
        } else {
            System.out.println("<"+new Date()+"> "+name + tuple.toString());
        }
        return true;
    }
}
