FileOutputStreamProcessor.java

/**
 * Copyright © 2012 Joe Littlejohn
 *
 * 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.github.joelittlejohn.embedmongo.log;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

import de.flapdoodle.embed.process.io.IStreamProcessor;

public class FileOutputStreamProcessor implements IStreamProcessor {

    private static OutputStreamWriter stream;

    private String logFile;
    private String encoding;

    public FileOutputStreamProcessor(String logFile, String encoding) {
        setLogFile(logFile);
        setEncoding(encoding);
    }

    @Override
    public synchronized void process(String block) {
        try {

            if (stream == null) {
                stream = new OutputStreamWriter(new FileOutputStream(logFile), encoding);
            }

            stream.write(block);
            stream.flush();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void onProcessed() {
        process("\n");
    }

    private void setLogFile(String logFile) {
        if (logFile == null || logFile.trim().length() == 0) {
            throw new IllegalArgumentException("no logFile given");
        }
        this.logFile = logFile;
    }

    private void setEncoding(String encoding) {
        if (encoding == null || encoding.trim().length() == 0) {
            throw new IllegalArgumentException("no encoding given");
        }
        this.encoding = encoding;
    }
}