package org.limewire.setting;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.StringTokenizer;
import org.limewire.util.FileUtils;
/**
* Provides a {@link File} setting value. As a subclass
* of <code>Setting</code>, the setting has a key.
* <p>
* Create a <code>FileArraySetting</code> object with a
* {@link SettingsFactory#createFileArraySetting(String, File[])}.
*/
public class FileArraySetting extends AbstractSetting<File[]> {
private File[] value;
/**
* Creates a new <tt>FileArraySetting</tt> instance with the specified
* key and default value.
*
* @param key the constant key to use for the setting
* @param defaultValue the default value to use for the setting
*/
FileArraySetting(Properties defaultProps, Properties props, String key,
File[] defaultValue) {
super(defaultProps, props, key, decode(defaultValue));
setPrivate(true);
}
/**
* Returns the value of this setting.
*
* @return the value of this setting
*/
public File[] get() {
return value;
}
/**
* Mutator for this setting.
*
* @param value the value to store
*/
public synchronized void set(File[] value) {
setValueInternal(decode(value));
}
/**
* Mutator for this setting.
*
* @param file file to the array
*/
public synchronized void add(File file) {
if (file == null)
return;
File[] newValue = new File[value.length+1];
System.arraycopy(value, 0, newValue, 0, value.length);
newValue[value.length] = file;
set(newValue);
}
/**
* Mutator for this setting.
*
* @param file remove file from the array, if it exists.
* @return false when the array does not contain the file or when the
* file is <code>null</code>
*/
public synchronized boolean remove(File file) {
if (file == null)
return false;
int index = indexOf(file);
if (index == -1) {
return false;
}
File[] newValue = new File[value.length-1];
// copy first half, up to first occurrence's index
System.arraycopy(value, 0, newValue, 0, index);
// copy second half, for the length of the rest of the array
System.arraycopy(value, index+1, newValue, index, value.length - index - 1);
set(newValue);
return true;
}
/** Returns true if the given file is contained in this array. */
public synchronized boolean contains(File file) {
return indexOf(file) >= 0;
}
/** Returns the index of the given file in this array, -1 if file is not found. */
public synchronized int indexOf(File file) {
if (file == null)
return -1;
for (int i = 0; i < value.length; i++) {
try {
if ((FileUtils.getCanonicalFile(value[i])).equals(FileUtils.getCanonicalFile(file)))
return i;
} catch(IOException ioe) {
continue;
}
}
return -1;
}
/** Returns the length of the array. */
public synchronized int length() {
return value.length;
}
/** Load value from property string value.
* @param sValue property string value
*
*/
@Override
protected synchronized void loadValue(String sValue) {
value = encode(sValue);
}
/** Splits the string into an Array. */
private static File[] encode(String src) {
if (src == null || src.length()==0) {
return (new File[0]);
}
StringTokenizer tokenizer = new StringTokenizer(src, ";");
File[] dirs = new File[tokenizer.countTokens()];
for(int i = 0; i < dirs.length; i++) {
dirs[i] = new File(tokenizer.nextToken());
}
return dirs;
}
/** Separates each field of the array by a semicolon. */
private static String decode(File[] src) {
if (src == null || src.length==0) {
return "";
}
StringBuilder buffer = new StringBuilder();
for(File file : src) {
buffer.append(file.getAbsolutePath()).append(';');
}
if (buffer.length() > 0) {
buffer.setLength(buffer.length()-1);
}
return buffer.toString();
}
/** Removes non-existent members from this. */
public synchronized void clean() {
List<File> list = new ArrayList<File>(value.length);
File file;
for (File aValue : value) {
file = aValue;
if (file == null)
continue;
if (!file.exists())
continue;
list.add(file);
}
set(list.toArray(new File[list.size()]));
}
}