| /******************************************************************************* |
| * Copyright (c) 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.osgi.framework.internal.defaultadaptor; |
| |
| import java.io.*; |
| import java.util.Properties; |
| |
| /** |
| * This class uses a Properties object to store and get MetaData information. |
| * All data is converted into String data before saving. |
| */ |
| public class MetaData { |
| |
| /** |
| * The Properties file to store the data. |
| */ |
| Properties properties = new Properties(); |
| |
| /** |
| * The File object to store and load the Properties object. |
| */ |
| File datafile; |
| |
| /** |
| * The header string to use when storing data to the datafile. |
| */ |
| String header; |
| |
| /** |
| * Constructs a MetaData object that uses the datafile to persistently |
| * store data. |
| * @param datafile The File object used to persistently load and store data. |
| * @param header The header to use when storing data persistently. |
| */ |
| public MetaData(File datafile, String header) { |
| this.datafile = datafile; |
| this.header = header; |
| } |
| |
| /** |
| * Gets the metadata value for the key. |
| * @param key the key of the metadata |
| * @param def the default value to return if the key does not exist |
| * @return the value of the metadata or null if the key does not exist |
| * and the specified default is null. |
| */ |
| public String get(String key, String def) { |
| return properties.getProperty(key, def); |
| } |
| |
| /** |
| * Gets the integer value for the key. |
| * @param key the key of the metadata |
| * @param def the default value to return if the key does not exist |
| * @return the value of the metadata; if the key does not exist or |
| * the value cannot be converted to an int value then the |
| * specified default value is returned. |
| */ |
| public int getInt(String key, int def) { |
| String result = get(key, null); |
| if (result == null) { |
| return def; |
| } |
| try { |
| return Integer.parseInt(result); |
| } catch (NumberFormatException nfe) { |
| return def; |
| } |
| } |
| |
| /** |
| * Gets the long value for the key. |
| * @param key the key of the metadata |
| * @param def the default value to return if the key does not exist |
| * @return the value of the metadata; if the key does not exist or |
| * the value cannot be converted to an long value then the |
| * specified default value is returned. |
| */ |
| public long getLong(String key, long def) { |
| String result = get(key, null); |
| if (result == null) { |
| return def; |
| } |
| try { |
| return Long.parseLong(result); |
| } catch (NumberFormatException nfe) { |
| return def; |
| } |
| } |
| |
| /** |
| * Gets the boolean value for the key. |
| * @param key the key of the metadata |
| * @param def the default value to return if the key does not exist |
| * @return the value of the metadata; if the key does not exist then the |
| * specified default value is returned. |
| */ |
| public boolean getBoolean(String key, boolean def) { |
| String result = get(key, null); |
| if (result == null) { |
| return def; |
| } |
| return Boolean.valueOf(result).booleanValue(); |
| } |
| |
| /** |
| * Sets the String value for a key. |
| * @param key the key of the metadata |
| * @param val the value of the metadata |
| */ |
| public void set(String key, String val) { |
| properties.put(key, val); |
| } |
| |
| /** |
| * Sets the int value for a key. |
| * @param key the key of the metadata |
| * @param val the value of the metadata |
| */ |
| public void setInt(String key, int val) { |
| properties.put(key, Integer.toString(val)); |
| } |
| |
| /** |
| * Sets the long value for a key. |
| * @param key the key of the metadata |
| * @param val the value of the metadata |
| */ |
| public void setLong(String key, long val) { |
| properties.put(key, Long.toString(val)); |
| } |
| |
| /** |
| * Sets the boolean value for a key. |
| * @param key the key of the metadata |
| * @param val the value of the metadata |
| */ |
| public void setBoolean(String key, boolean val) { |
| properties.put(key, new Boolean(val).toString()); |
| } |
| |
| /** |
| * Removes the metadata value with the specified key. |
| * @param key the key of the metadata to be removed |
| */ |
| public void remove(String key) { |
| properties.remove(key); |
| } |
| |
| /** |
| * Saves the metadata to persistent storage. |
| * @throws IOException if there is a problem saving to persistent storage. |
| */ |
| public void save() throws IOException { |
| FileOutputStream fos = new FileOutputStream(datafile); |
| properties.store(fos, header); |
| } |
| |
| /** |
| * Loads the metadata from persistent storage |
| * @throws IOException if there is a problem reading from persistent storage. |
| */ |
| public void load() throws IOException { |
| properties.clear(); |
| if (datafile.exists()) { |
| FileInputStream fis = new FileInputStream(datafile); |
| properties.load(fis); |
| fis.close(); |
| } |
| } |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString() { |
| return properties.toString(); |
| } |
| |
| } |