Looks up the value of a key from the properties file and converts it to an integer. - Android java.util

Android examples for java.util:Properties

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Description

Looks up the value of a key from the properties file and converts it to an integer.

Demo Code


import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class Main{
    /**//ww  w .  java 2 s. co  m
     * The name of the properties file we're looking for
     */
    private final static String file = "cloudfiles.properties";
    /**
     * A cache of the properties
     */
    private static Properties props = null;
    /**
     * Looks up the value of a key from the properties file and converts it to an integer.
     *
     * @param key
     * @return The value of that key
     */
    public static int getIntProperty(final String key) {
        final String property = getProperty(key);
        if (property == null) {
            //logger.warn("Could not load integer property " + key + ".");
            return -1;
        }
        try {
            return Integer.parseInt(property);
        } catch (NumberFormatException e) {
            //logger.warn("Invalid format for a number in properties file: " + property + ".", e);
            return -1;
        }
    }
    /**
     * Look up a property from the properties file.
     *
     * @param key The name of the property to be found
     * @return The value of the property
     */
    public static String getProperty(final String key) {
        if (props == null) {
            try {
                loadPropertiesFromClasspath();
            } catch (Exception e) {
                //logger.warn("Unable to load properties file.", e);
            }
        }
        return props.getProperty(key);
    }
    /**
     * Look up a property from the properties file.
     *
     * @param key The name of the property to be found
     * @return The value of the property
     */
    public static String getProperty(final String key,
            final String defaultValue) {
        if (props == null) {
            try {
                loadPropertiesFromClasspath();
            } catch (Exception e) {
                //logger.warn("Unable to load properties file.", e);
            }
        }
        return props.getProperty(key, defaultValue);
    }
    /**
     * Find the properties file in the class path and load it.
     *
     * @throws IOException
     */
    private static synchronized void loadPropertiesFromClasspath()
            throws IOException {
        props = new Properties();
        InputStream io = FilesUtil.class.getClassLoader()
                .getResourceAsStream(file);
        if (io == null) {
            throw new FileNotFoundException("Property file '" + file
                    + "' not found in the classpath.");
        }
        loadProperties(io);
    }
    /**
     * Loads properties from input stream.
     *
     * @param io
     * @throws IOException
     */
    public static void loadProperties(final InputStream io)
            throws IOException {
        if (null == io) {
            throw new IllegalArgumentException(
                    "Input stream cannot be null.");
        }
        props = new Properties();
        props.load(io);
    }
}

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