com.petpet.c3po.gatherer.FileMetadataStream.java Source code

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Here is the source code for com.petpet.c3po.gatherer.FileMetadataStream.java

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/*******************************************************************************
 * Copyright 2013 Petar Petrov <me@petarpetrov.org>
 * 
 * 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.petpet.c3po.gatherer;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.petpet.c3po.api.model.helper.MetadataStream;

/**
 * A simple wrapper around an input stream that holds the fileName (or some
 * human readable identifier) of the stream.
 * 
 * @author Petar Petrov <me@petarpetrov.org>
 * 
 */
public class FileMetadataStream implements MetadataStream {

    /**
     * Default logger.
     */
    private static final Logger LOG = LoggerFactory.getLogger(FileMetadataStream.class);

    /**
     * Some human readable name of the digital object that this meta data stream
     * describes.
     */
    private String fileName;

    /**
     * Sets the passed variables.
     * 
     * @param fileName
     *          a human readable identifier of the object that this metadata
     *          stream describes.
        
     */
    public FileMetadataStream(String fileName) {
        this.fileName = fileName;
    }

    public String getName() {
        return this.fileName;
    }

    public String getData() {
        String data = null;
        try {
            InputStream is = new BufferedInputStream(new FileInputStream(new File(this.fileName)), 8192);
            data = this.readStream(this.fileName, is);
        } catch (FileNotFoundException e) {
            LOG.warn("An error occurred while openning the stream to {}. Error: {}", fileName, e.getMessage());
        }

        return data;
    }

    public String getData(File file) {
        String data = null;
        try {
            InputStream is = new BufferedInputStream(new FileInputStream(file), 8192);
            data = this.readStream(this.fileName, is);
        } catch (FileNotFoundException e) {
            LOG.warn("An error occurred while openning the stream to {}. Error: {}", fileName, e.getMessage());
        }

        return data;
    }

    /**
     * Reads the given input stream into memory and returns it. The stream is
     * closed.
     *
     * @param name
     *          the name of the file/object holding the stream.
     * @param data
     *          the input stream to read.
     * @return the string that was read out of the stream.
     */
    private String readStream(String name, InputStream data) {
        String result = null;
        try {
            result = IOUtils.toString(data);
        } catch (Exception e) {
            LOG.warn("An error occurred, while reading the stream for {}: {}", name, e.getMessage());
        } finally {
            IOUtils.closeQuietly(data);
        }
        return result;
    }

}