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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2014 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
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package org.scijava.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;
/**
* Simple utility class that stores and retrieves user preferences.
*
* Some of this code was adapted from the PrefsUtil class by Robin Sharp of Javelin Software..
*
*
* @author Curtis Rueden
* @author Barry DeZonia
* @author Grant Harris
*/
public final class Prefs {
private Prefs() {
// prevent instantiation of utility class
}
// -- Global preferences --
public static String get(final String name) {
return get((Class) null, name);
}
public static String get(final String name, final String defaultValue) {
return get(null, name, defaultValue);
}
public static boolean getBoolean(final String name,
final boolean defaultValue)
{
return getBoolean(null, name, defaultValue);
}
public static double getDouble(final String name, final double defaultValue)
{
return getDouble(null, name, defaultValue);
}
public static float getFloat(final String name, final float defaultValue) {
return getFloat(null, name, defaultValue);
}
public static int getInt(final String name, final int defaultValue) {
return getInt(null, name, defaultValue);
}
public static long getLong(final String name, final long defaultValue) {
return getLong(null, name, defaultValue);
}
public static void put(final String name, final String value) {
put(null, name, value);
}
public static void put(final String name, final boolean value) {
put(null, name, value);
}
public static void put(final String name, final double value) {
put(null, name, value);
}
public static void put(final String name, final float value) {
put(null, name, value);
}
public static void put(final String name, final int value) {
put(null, name, value);
}
public static void put(final String name, final long value) {
put(null, name, value);
}
// -- Class-specific preferences --
public static String get(final Class c, final String name) {
return get(c, name, null);
}
public static String get(final Class c, final String name,
final String defaultValue)
{
return prefs(c).get(key(c, name), defaultValue);
}
public static boolean getBoolean(final Class c, final String name,
final boolean defaultValue)
{
return prefs(c).getBoolean(key(c, name), defaultValue);
}
public static double getDouble(final Class c, final String name,
final double defaultValue)
{
return prefs(c).getDouble(key(c, name), defaultValue);
}
public static float getFloat(final Class c, final String name,
final float defaultValue)
{
return prefs(c).getFloat(key(c, name), defaultValue);
}
public static int getInt(final Class c, final String name,
final int defaultValue)
{
return prefs(c).getInt(key(c, name), defaultValue);
}
public static long getLong(final Class c, final String name,
final long defaultValue)
{
return prefs(c).getLong(key(c, name), defaultValue);
}
public static void put(final Class c, final String name,
final String value)
{
prefs(c).put(key(c, name), value);
}
public static void put(final Class c, final String name,
final boolean value)
{
prefs(c).putBoolean(key(c, name), value);
}
public static void put(final Class c, final String name,
final double value)
{
prefs(c).putDouble(key(c, name), value);
}
public static void
put(final Class c, final String name, final float value)
{
prefs(c).putFloat(key(c, name), value);
}
public static void put(final Class c, final String name, final int value)
{
prefs(c).putInt(key(c, name), value);
}
public static void
put(final Class c, final String name, final long value)
{
prefs(c).putLong(key(c, name), value);
}
public static void clear(final Class c) {
try {
prefs(c).clear();
}
catch (final BackingStoreException e) {
// do nothing
}
}
// -- Other/unsorted --
// TODO - Evaluate which of these methods are really needed, and which are
// duplicate of similar functionality above.
/** Clears everything. */
public static void clearAll() {
try {
final String[] childNames = Preferences.userRoot().childrenNames();
for (final String name : childNames)
Preferences.userRoot().node(name).removeNode();
}
catch (final BackingStoreException e) {
// do nothing
}
}
/** Clears the node. */
public static void clear(final String key) {
clear(prefs(null), key);
}
public static void clear(final Preferences preferences, final String key) {
try {
if (preferences.nodeExists(key)) {
preferences.node(key).clear();
}
}
catch (final BackingStoreException bse) {
bse.printStackTrace();
}
}
/** Removes the node. */
public static void remove(final Preferences preferences, final String key) {
try {
if (preferences.nodeExists(key)) {
preferences.node(key).removeNode();
}
}
catch (final BackingStoreException bse) {
bse.printStackTrace();
}
}
/** Puts a list into the preferences. */
public static void putMap(final Map map, final String key) {
putMap(prefs(null), map, key);
}
public static void putMap(final Preferences preferences,
final Map map, final String key)
{
putMap(preferences.node(key), map);
}
/** Puts a list into the preferences. */
public static void putMap(final Preferences preferences,
final Map map)
{
if (preferences == null) {
throw new IllegalArgumentException("Preferences not set.");
}
final Iterator> iter = map.entrySet().iterator();
while (iter.hasNext()) {
final Entry entry = iter.next();
final Object value = entry.getValue();
preferences.put(entry.getKey().toString(), value == null ? null : value
.toString());
}
}
/** Gets a Map from the preferences. */
public static Map getMap(final String key) {
return getMap(prefs(null), key);
}
public static Map getMap(final Preferences preferences,
final String key)
{
return getMap(preferences.node(key));
}
/** Gets a Map from the preferences. */
public static Map getMap(final Preferences preferences) {
if (preferences == null) {
throw new IllegalArgumentException("Preferences not set.");
}
final Map map = new HashMap();
try {
final String[] keys = preferences.keys();
for (int index = 0; index < keys.length; index++) {
map.put(keys[index], preferences.get(keys[index], null));
}
}
catch (final BackingStoreException bse) {
bse.printStackTrace();
}
return map;
}
/** Puts a list into the preferences. */
public static void putList(final List list, final String key) {
putList(prefs(null), list, key);
}
public static void putList(final Preferences preferences,
final List list, final String key)
{
putList(preferences.node(key), list);
}
/** Puts a list into the preferences. */
public static void putList(final Preferences preferences,
final List list)
{
if (preferences == null) {
throw new IllegalArgumentException("Preferences not set.");
}
for (int index = 0; list != null && index < list.size(); index++) {
final Object value = list.get(index);
preferences.put("" + index, value == null ? null : value.toString());
}
}
/** Gets a List from the preferences. */
public static List getList(final String key) {
return getList(prefs(null), key);
}
public static List getList(final Preferences preferences,
final String key)
{
return getList(preferences.node(key));
}
/**
* Gets a List from the preferences. Returns an empty list if nothing in
* prefs.
*/
public static List getList(final Preferences preferences) {
if (preferences == null) {
throw new IllegalArgumentException("Preferences not set.");
}
final List list = new ArrayList();
for (int index = 0; index < 1000; index++) {
final String value = preferences.get("" + index, null);
if (value == null) {
break;
}
list.add(value);
}
return list;
}
// -- Helper methods --
private static Preferences prefs(final Class c) {
return Preferences.userNodeForPackage(c == null ? Prefs.class : c);
}
private static String key(final Class c, final String name) {
return c == null ? name : c.getSimpleName() + "." + name;
}
}