cat.calidos.morfeu.utils.FileSaver.java Source code

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Here is the source code for cat.calidos.morfeu.utils.FileSaver.java

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/*
 *    Copyright 2017 Daniel Giribet
 *
 *   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 cat.calidos.morfeu.utils;

import java.io.File;
import java.io.IOException;

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

import cat.calidos.morfeu.problems.SavingException;

/**
* @author daniel giribet
*///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public class FileSaver {

    public static final String BACKUP_EXTENSION = ".back";

    protected final static Logger log = LoggerFactory.getLogger(FileSaver.class);

    private String destination;
    private String content;

    public FileSaver(String destination, String content) {

        this.destination = destination;
        this.content = content;

    }

    public void save() throws SavingException {

        File destinationFile = new File(destination);
        if (destinationFile.isDirectory()) {
            log.error("Cannot save to '{}' as it is a folder and not a file", destination);
            throw new SavingException("Could not save to '" + destination + "' as it is a folder and not a file");
        }

        try {
            FileUtils.touch(destinationFile);
        } catch (IOException e) {
            log.error("Cannot save to '{}' as we cannot even touch it", destination);
            throw new SavingException("Could not save to '" + destination + "' as we cannot write to it", e);
        }
        if (!destinationFile.canWrite()) {
            log.error("Cannot save to '{}' as we cannot write to it", destination);
            throw new SavingException("Could not save to '" + destination + "' as we cannot write to it");
        }
        if (destinationFile.exists()) {
            String backupPath = destinationFile.getAbsolutePath() + BACKUP_EXTENSION;
            log.info("Renaming old '{}' to '{}'", destination, backupPath);
            File backupFile = new File(backupPath);
            if (backupFile.exists()) {
                backupFile.delete();
            }
            destinationFile.renameTo(backupFile);
        }

        try {
            FileUtils.writeStringToFile(destinationFile, content, Config.DEFAULT_CHARSET);
        } catch (IOException e) {
            log.error("Removing old '{}' to replace it with new content", destination);
            throw new SavingException("Could not save to '" + destination + "' due to IO problems", e);
        }

    }

}