uk.ac.ebi.arrayexpress.app.ApplicationPreferences.java Source code

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Here is the source code for uk.ac.ebi.arrayexpress.app.ApplicationPreferences.java

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package uk.ac.ebi.arrayexpress.app;

/*
 * Copyright 2009-2011 European Molecular Biology Laboratory
 *
 * 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.
 *
 */

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConversionException;
import org.apache.commons.configuration.XMLConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.NoSuchElementException;

public class ApplicationPreferences {
    // logging machinery
    private final Logger logger = LoggerFactory.getLogger(getClass());

    private String prefsFileName;
    private Configuration prefs;

    public ApplicationPreferences(String fileName) {
        this.prefsFileName = fileName;
    }

    public void initialize() {
        load();
    }

    public void terminate() {
        if (null != prefs) {
            prefs = null;
        }
    }

    public String getString(String key) {
        return prefs.getString(key);
    }

    public String[] getStringArray(String key) {
        String value = prefs.getString(key);

        return value.contains(",") ? value.split("\\s*,\\s*") : new String[] { value };
    }

    public Integer getInteger(String key) {
        Integer value = null;
        try {
            value = prefs.getInt(key);
        } catch (ConversionException x) {
            logger.error(x.getMessage());
        } catch (NoSuchElementException x) {
            logger.error(x.getMessage());
        } catch (Exception x) {
            logger.error("Caught an exception:", x);
        }
        return value;
    }

    public Long getLong(String key) {
        Long value = null;
        try {
            value = prefs.getLong(key);
        } catch (ConversionException x) {
            logger.error(x.getMessage());
        } catch (NoSuchElementException x) {
            logger.error(x.getMessage());
        } catch (Exception x) {
            logger.error("Caught an exception:", x);
        }
        return value;
    }

    public Boolean getBoolean(String key) {
        Boolean value = null;
        try {
            value = prefs.getBoolean(key);
        } catch (NoSuchElementException x) {
            logger.error(x.getMessage());
        } catch (Exception x) {
            logger.error("Caught an exception:", x);
        }

        return value;
    }

    public Configuration getConfSubset(String key) {
        return prefs.subset(key);
    }

    private void load() {
        // todo: what to do if file is not there? must be a clear error message + shutdown
        InputStream prefsStream = null;
        try {
            XMLConfiguration.setDefaultListDelimiter('\uffff');
            XMLConfiguration xmlConfig = new XMLConfiguration();

            //try to get system property file
            String filename = System.getProperty("biosamples.preferences.file");
            URL prefsURL;
            if (filename != null) {
                logger.info("Got value of system property biosamples.preferences.file " + filename);
                File prefsFile = new File(filename);
                prefsURL = prefsFile.toURI().toURL();
            } else {
                logger.info("Falling back to /WEB-INF/classes/" + prefsFileName + ".xml");
                prefsURL = Application.getInstance().getResource("/WEB-INF/classes/" + prefsFileName + ".xml");
            }

            prefsStream = prefsURL.openStream();
            xmlConfig.load(prefsStream);

            prefs = xmlConfig;
        } catch (Exception x) {
            logger.error("Caught an exception:", x);
        } finally {
            if (null != prefsStream) {
                try {
                    prefsStream.close();
                } catch (IOException x) {
                    logger.error("Caught an exception:", x);
                }
            }
        }
    }
}