FilePropertiesSource.java

package com.marklogic.client.modulesloader.tokenreplacer;

import com.marklogic.client.helper.LoggingObject;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;

/**
 * Simple implementation of PropertiesSource that reads properties from a file.
 */
public class FilePropertiesSource extends LoggingObject implements PropertiesSource {

    private Properties props;
    private File file;

    public FilePropertiesSource(File file) {
        this.file = file;
    }

    @Override
    public Properties getProperties() {
        if (props == null) {
            props = loadPropertiesFromFile(file);
        }
        return props;
    }

    /**
     * Return a Properties instance based on properties from the given File.
     *
     * @param file
     * @return
     */
    protected Properties loadPropertiesFromFile(File file) {
        Properties properties = new Properties();
        if (file.exists()) {
            FileReader reader = null;
            try {
                reader = new FileReader(file);
                if (logger.isDebugEnabled()) {
                    logger.debug("Loading module properties from: " + file.getAbsolutePath());
                }
                properties.load(reader);
            } catch (IOException ex) {
                logger.warn(
                        "Unable to load properties from file " + file.getAbsolutePath() + "; cause: " + ex.getMessage(),
                        ex);
            } finally {
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (IOException ie) {
                        // Ignore
                    }
                }
            }
        }
        return properties;
    }
}