trunk/activemq-core/src/main/java/org/apache/activemq/broker/view/DotFileInterceptorSupport.java

/**
 * 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.activemq.broker.view;

import java.io.FileWriter;
import java.io.PrintWriter;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Useful base class
 * 
 * 
 */
public abstract class DotFileInterceptorSupport extends BrokerFilter {
    private final Logger log = LoggerFactory.getLogger(DotFileInterceptorSupport.class);

    private String file;

    public DotFileInterceptorSupport(Broker next, String file) {
        super(next);
        this.file = file;
    }

    protected void generateFile() throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("Creating DOT file at: " + file);
        }
        PrintWriter writer = new PrintWriter(new FileWriter(file));
        try {
            generateFile(writer);
        } finally {
            writer.close();
        }
    }

    protected abstract void generateFile(PrintWriter writer) throws Exception;
}