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https://github.com/DSheirer/sdrtrunk.git
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Initial code check in continued
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dennis.sheirer
307
src/properties/SystemProperties.java
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307
src/properties/SystemProperties.java
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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******************************************************************************/
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package properties;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Properties;
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import log.Log;
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/**
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* SystemProperties - provides an isolated instance of properties for the
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* application
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*/
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public class SystemProperties
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{
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private static String sDEFAULT_APP_ROOT = "SDRTrunk";
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private static String sPROPERTIES_FILENAME = "SDRTrunk.properties";
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private static SystemProperties mInstance;
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private static Properties mProperties;
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private Path mPropertiesPath;
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private SystemProperties()
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{
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mProperties = new Properties();
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}
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/**
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* Returns a SINGLETON instance of the application properties set
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* @return
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*/
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public static SystemProperties getInstance()
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{
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if( mInstance == null )
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{
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mInstance = new SystemProperties();
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}
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return mInstance;
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}
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/**
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* Saves any currently changed settings to the application properties file
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*/
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public void save()
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{
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Path propsPath =
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getApplicationRootPath().resolve( sPROPERTIES_FILENAME );
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OutputStream out = null;
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try
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{
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out = new FileOutputStream( propsPath.toString() );
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String comments =
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"SDRTrunk - SDR Trunking Decoder Application Settings";
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mProperties.store( out, comments );
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Log.info( "SystemProperties - saved current properties [" +
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propsPath.toString() + "]" );
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}
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catch( Exception e )
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{
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Log.error( "SystemProperties - exception while saving " +
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"application properties:" + e.getLocalizedMessage() );
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}
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finally
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{
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if( out != null )
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{
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try
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{
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out.close();
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}
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catch ( IOException e )
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{
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}
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}
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}
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}
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/**
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* Application root directory. Normally returns "SDRTRunk" from the user's
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* home directory, unless that has been changed to another location on the
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* file system by the user.
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*/
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public Path getApplicationRootPath()
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{
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Path retVal = null;
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String root = get( "root.directory", sDEFAULT_APP_ROOT );
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if( root.equalsIgnoreCase( sDEFAULT_APP_ROOT ) )
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{
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retVal = Paths.get(
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System.getProperty( "user.home" ), sDEFAULT_APP_ROOT );
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}
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else
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{
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retVal = Paths.get( root );
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}
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return retVal;
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}
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public Path getApplicationFolder( String folder )
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{
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Path retVal = getApplicationRootPath().resolve( folder );
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if( !Files.exists( retVal ) )
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{
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try
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{
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Files.createDirectory( retVal );
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}
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catch ( IOException e )
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{
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Log.error( "SystemProperties - exception while creating " +
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"app folder [" + folder + "]" );
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}
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}
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return retVal;
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}
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public void logCurrentSettings()
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{
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if( mPropertiesPath == null )
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{
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Log.info( "SystemProperties - no properties file loaded - using defaults" );
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}
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else
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{
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Log.info( "SystemProperties - application properties loaded [" + mPropertiesPath.toString() + "]" );
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}
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}
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/**
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* Loads the properties file into this properties set
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* @param file
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*/
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public void load( Path propertiesPath )
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{
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if( propertiesPath != null )
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{
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mPropertiesPath = propertiesPath;
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InputStream in = null;
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try
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{
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in = new FileInputStream( propertiesPath.toString() );
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}
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catch ( FileNotFoundException e )
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{
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Log.error( "SDRTrunk - exception while opening inputstream on " +
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"application properties file - " + e.getLocalizedMessage() );
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}
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if( in != null )
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{
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try
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{
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mProperties.load( in );
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}
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catch ( IOException e )
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{
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Log.error( "SDRTrunk - exception while loading properties " +
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"inputstream into SystemProperties - " +
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e.getLocalizedMessage() );
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}
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finally
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{
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try
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{
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in.close();
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}
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catch ( IOException e )
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{
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}
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}
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}
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}
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Log.info( "SystemProperties - loaded [" +
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propertiesPath.toString() + "]" );
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}
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/**
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* Returns the value of the property, or null if the property doesn't exist
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*/
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private String get( String key )
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{
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return mProperties.getProperty( key );
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}
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/**
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* Returns the value of the property, or the defaultValue if the
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* property doesn't exist
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*/
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public String get( String key, String defaultValue )
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{
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String value = get( key );
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if( value != null )
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{
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return value;
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}
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set( key, defaultValue );
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return defaultValue;
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}
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/**
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* Returns the value of the property, or the defaultValue if the
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* property doesn't exist
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*/
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public boolean get( String key, boolean defaultValue )
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{
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String value = get( key );
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if( value != null )
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{
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try
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{
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boolean stored = Boolean.parseBoolean( value );
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return stored;
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}
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catch( Exception e )
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{
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//Do nothing, we couldn't parse the stored value
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}
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}
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set( key, String.valueOf( defaultValue ) );
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return defaultValue;
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}
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/**
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* Returns the value of the property, or the defaultValue if the
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* property doesn't exist
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*/
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public int get( String key, int defaultValue )
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{
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String value = get( key );
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if( value != null )
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{
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try
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{
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int stored = Integer.parseInt( value );
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return stored;
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}
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catch( Exception e )
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{
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//Do nothing, we couldn't parse the stored value
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}
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}
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set( key, String.valueOf( defaultValue ) );
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return defaultValue;
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}
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/**
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* Sets (overrides) the property key with the new value
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*/
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public void set( String key, String value )
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{
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mProperties.setProperty( key, value );
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save();
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}
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}
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