org/jsampler/HF.java

/*
 *   JSampler - a java front-end for LinuxSampler
 *
 *   Copyright (C) 2005-2011 Grigor Iliev <grigor@grigoriliev.com>
 *
 *   This file is part of JSampler.
 *
 *   JSampler is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2
 *   as published by the Free Software Foundation.
 *
 *   JSampler is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with JSampler; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *   MA  02111-1307  USA
 */

package org.jsampler;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.text.NumberFormat;
import java.util.logging.Level;

import org.linuxsampler.lscp.LSException;
import org.linuxsampler.lscp.LscpException;

import static org.jsampler.JSI18n.i18n;


/**
 * This class contains some helper function.
 * @author Grigor Iliev
 */
public class HF {
        private static NumberFormat numberFormat = NumberFormat.getInstance();
        
        static {
                numberFormat.setMaximumFractionDigits(1);
        }
        
        /**
         * Returns more meaningful, non-<code>null</code> message.
         * @return More meaningful, non-<code>null</code> message.
         */
        public static String
        getErrorMessage(Exception e) {
                String msg = e.getMessage();
                
                if(e instanceof LSException) {
                        LSException x = (LSException)e;
                } else if(e instanceof LscpException) {
                        
                } else { msg = (msg != null ? msg : i18n.getError("unknownError")); }
                
                return msg;
        }
        
        /**
         * Deletes the specified file, if exists and
         * is located in the JSampler's home directory.
         * @param file The file to delete.
         */
        public static void
        deleteFile(String file) {
                String s = CC.getJSamplerHome();
                if(s == null) return;
                
                try {
                        File f = new File(s + File.separator + file);
                        if(f.isFile()) f.delete();
                } catch(Exception x) {
                        CC.getLogger().log(Level.INFO, getErrorMessage(x), x);
                }
        }
        
        /**
         * Create a backup copy of the specified file, located in the JSampler's home directory.
         * @param file The name of the file to backup.
         * @param bkpFile The backup name of the file.
         * @return <code>true</code> if the file is backuped successfully.
         */
        public static boolean
        createBackup(String file, String bkpFile) {
                if(file == null || bkpFile == null) return false;
                if(file.length() == 0 || bkpFile.length() == 0) return false;
                
                String s = CC.getJSamplerHome();
                if(s == null) return false;
                
                File f = new File(s + File.separator + file);
                if(!f.isFile()) return false;
                
                try {
                        FileInputStream fis = new FileInputStream(s + File.separator + file);
                        
                        FileOutputStream fos;
                        fos = new FileOutputStream(s + File.separator + bkpFile, false);
                        
                        int i = fis.read();
                        while(i != -1) {
                                fos.write(i);
                                i = fis.read();
                        }
                } catch(Exception x) {
                        CC.getLogger().log(Level.INFO, getErrorMessage(x), x);
                        return false;
                }
                
                return true;
        }
        
        /**
         * Converts the volume value specified in percents to decibels.
         */
        public static double
        percentsToDecibels(int vol) {
                if(vol == 0) return Double.NEGATIVE_INFINITY;
                double i = vol;
                i /= 100;
                i = 20 * Math.log10(i);
                return i;
        }
        
        
        /**
         * Converts the volume value specified in decibels to percents.
         */
        public static int
        decibelsToPercents(double vol) {
                if(vol == Double.NEGATIVE_INFINITY) return 0;
                double i = Math.pow(10, vol/20);
                i *= 100;
                return (int)i;
        }
        
        /**
         * Converts the volume value specified in decibels to volume factor.
         */
        public static float
        decibelsToFactor(double vol) {
                if(vol == Double.NEGATIVE_INFINITY) return 0;
                double i = Math.pow(10, vol/20);
                return (float)i;
        }
        
        /**
         * Converts the volume value specified in percents to volume factor.
         */
        public static float
        percentsToFactor(int vol) {
                float f = vol;
                f /= 100;
                return f;
        }
        
        /** Tests whether the application can read/write the specified file. */
        public static boolean
        canReadWrite(String file) {
                File f = new File(file);
                if(f.isDirectory()) return false;
                if(f.canRead() && f.canWrite()) return true;
                return false;
        }
        
        /** Tests whether the application can read/write files in the specified directory. */
        public static boolean
        canReadWriteFiles(String dir) {
                File f = new File(dir);
                if(!f.isDirectory()) return false;
                if(f.canRead() && f.canWrite() && f.canExecute()) return true;
                return false;
        }
                
        public static String
        getVolumeString(int volume) {
                if(CC.getViewConfig().isMeasurementUnitDecibel()) {
                        return numberFormat.format(HF.percentsToDecibels(volume)) + "dB";
                } else {
                        return String.valueOf(volume) + "%";
                }
        }
}
1	/*
2	* JSampler - a java front-end for LinuxSampler
3	*
4	* Copyright (C) 2005-2011 Grigor Iliev <grigor@grigoriliev.com>
5	*
6	* This file is part of JSampler.
7	*
8	* JSampler is free software; you can redistribute it and/or modify
9	* it under the terms of the GNU General Public License version 2
10	* as published by the Free Software Foundation.
11	*
12	* JSampler is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with JSampler; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20	* MA 02111-1307 USA
21	*/
22
23	package org.jsampler;
24
25	import java.io.File;
26	import java.io.FileInputStream;
27	import java.io.FileOutputStream;
28	import java.text.NumberFormat;
29	import java.util.logging.Level;
30
31	import org.linuxsampler.lscp.LSException;
32	import org.linuxsampler.lscp.LscpException;
33
34	import static org.jsampler.JSI18n.i18n;
35
36
37	/**
38	* This class contains some helper function.
39	* @author Grigor Iliev
40	*/
41	public class HF {
42	private static NumberFormat numberFormat = NumberFormat.getInstance();
43
44	static {
45	numberFormat.setMaximumFractionDigits(1);
46	}
47
48	/**
49	* Returns more meaningful, non-<code>null</code> message.
50	* @return More meaningful, non-<code>null</code> message.
51	*/
52	public static String
53	getErrorMessage(Exception e) {
54	String msg = e.getMessage();
55
56	if(e instanceof LSException) {
57	LSException x = (LSException)e;
58	} else if(e instanceof LscpException) {
59
60	} else { msg = (msg != null ? msg : i18n.getError("unknownError")); }
61
62	return msg;
63	}
64
65	/**
66	* Deletes the specified file, if exists and
67	* is located in the JSampler's home directory.
68	* @param file The file to delete.
69	*/
70	public static void
71	deleteFile(String file) {
72	String s = CC.getJSamplerHome();
73	if(s == null) return;
74
75	try {
76	File f = new File(s + File.separator + file);
77	if(f.isFile()) f.delete();
78	} catch(Exception x) {
79	CC.getLogger().log(Level.INFO, getErrorMessage(x), x);
80	}
81	}
82
83	/**
84	* Create a backup copy of the specified file, located in the JSampler's home directory.
85	* @param file The name of the file to backup.
86	* @param bkpFile The backup name of the file.
87	* @return <code>true</code> if the file is backuped successfully.
88	*/
89	public static boolean
90	createBackup(String file, String bkpFile) {
91	if(file == null \|\| bkpFile == null) return false;
92	if(file.length() == 0 \|\| bkpFile.length() == 0) return false;
93
94	String s = CC.getJSamplerHome();
95	if(s == null) return false;
96
97	File f = new File(s + File.separator + file);
98	if(!f.isFile()) return false;
99
100	try {
101	FileInputStream fis = new FileInputStream(s + File.separator + file);
102
103	FileOutputStream fos;
104	fos = new FileOutputStream(s + File.separator + bkpFile, false);
105
106	int i = fis.read();
107	while(i != -1) {
108	fos.write(i);
109	i = fis.read();
110	}
111	} catch(Exception x) {
112	CC.getLogger().log(Level.INFO, getErrorMessage(x), x);
113	return false;
114	}
115
116	return true;
117	}
118
119	/**
120	* Converts the volume value specified in percents to decibels.
121	*/
122	public static double
123	percentsToDecibels(int vol) {
124	if(vol == 0) return Double.NEGATIVE_INFINITY;
125	double i = vol;
126	i /= 100;
127	i = 20 * Math.log10(i);
128	return i;
129	}
130
131
132
133	/**
134	* Converts the volume value specified in decibels to percents.
135	*/
136	public static int
137	decibelsToPercents(double vol) {
138	if(vol == Double.NEGATIVE_INFINITY) return 0;
139	double i = Math.pow(10, vol/20);
140	i *= 100;
141	return (int)i;
142	}
143
144	/**
145	* Converts the volume value specified in decibels to volume factor.
146	*/
147	public static float
148	decibelsToFactor(double vol) {
149	if(vol == Double.NEGATIVE_INFINITY) return 0;
150	double i = Math.pow(10, vol/20);
151	return (float)i;
152	}
153
154	/**
155	* Converts the volume value specified in percents to volume factor.
156	*/
157	public static float
158	percentsToFactor(int vol) {
159	float f = vol;
160	f /= 100;
161	return f;
162	}
163
164	/** Tests whether the application can read/write the specified file. */
165	public static boolean
166	canReadWrite(String file) {
167	File f = new File(file);
168	if(f.isDirectory()) return false;
169	if(f.canRead() && f.canWrite()) return true;
170	return false;
171	}
172
173	/** Tests whether the application can read/write files in the specified directory. */
174	public static boolean
175	canReadWriteFiles(String dir) {
176	File f = new File(dir);
177	if(!f.isDirectory()) return false;
178	if(f.canRead() && f.canWrite() && f.canExecute()) return true;
179	return false;
180	}
181
182	public static String
183	getVolumeString(int volume) {
184	if(CC.getViewConfig().isMeasurementUnitDecibel()) {
185	return numberFormat.format(HF.percentsToDecibels(volume)) + "dB";
186	} else {
187	return String.valueOf(volume) + "%";
188	}
189	}
190	}