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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.
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* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
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package org.scijava.prefs;
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 org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;
/**
* Default {@link PrefService} implementation, which persists preferences to
* disk using the {@link java.util.prefs.Preferences} API.
*
* @author Mark Hiner
* @author Curtis Rueden
* @author Grant Harris
*/
@Plugin(type = Service.class)
public class DefaultPrefService extends AbstractPrefService {
@Parameter(required = false)
private LogService log;
// -- Global preferences --
@Override
public String get(final String name) {
return get((Class) null, name);
}
@Override
public String get(final String name, final String defaultValue) {
return get(null, name, defaultValue);
}
@Override
public boolean getBoolean(final String name, final boolean defaultValue) {
return getBoolean(null, name, defaultValue);
}
@Override
public double getDouble(final String name, final double defaultValue) {
return getDouble(null, name, defaultValue);
}
@Override
public float getFloat(final String name, final float defaultValue) {
return getFloat(null, name, defaultValue);
}
@Override
public int getInt(final String name, final int defaultValue) {
return getInt(null, name, defaultValue);
}
@Override
public long getLong(final String name, final long defaultValue) {
return getLong(null, name, defaultValue);
}
@Override
public void put(final String name, final String value) {
put(null, name, value);
}
@Override
public void put(final String name, final boolean value) {
put(null, name, value);
}
@Override
public void put(final String name, final double value) {
put(null, name, value);
}
@Override
public void put(final String name, final float value) {
put(null, name, value);
}
@Override
public void put(final String name, final int value) {
put(null, name, value);
}
@Override
public void put(final String name, final long value) {
put(null, name, value);
}
// -- Class-specific preferences --
@Override
public String get(final Class c, final String name) {
return get(c, name, null);
}
@Override
public String get(final Class c, final String name,
final String defaultValue)
{
return prefs(c).get(key(c, name), defaultValue);
}
@Override
public boolean getBoolean(final Class c, final String name,
final boolean defaultValue)
{
return prefs(c).getBoolean(key(c, name), defaultValue);
}
@Override
public double getDouble(final Class c, final String name,
final double defaultValue)
{
return prefs(c).getDouble(key(c, name), defaultValue);
}
@Override
public float getFloat(final Class c, final String name,
final float defaultValue)
{
return prefs(c).getFloat(key(c, name), defaultValue);
}
@Override
public int
getInt(final Class c, final String name, final int defaultValue)
{
return prefs(c).getInt(key(c, name), defaultValue);
}
@Override
public long getLong(final Class c, final String name,
final long defaultValue)
{
return prefs(c).getLong(key(c, name), defaultValue);
}
@Override
public void put(final Class c, final String name, final String value) {
prefs(c).put(key(c, name), value);
}
@Override
public void put(final Class c, final String name, final boolean value) {
prefs(c).putBoolean(key(c, name), value);
}
@Override
public void put(final Class c, final String name, final double value) {
prefs(c).putDouble(key(c, name), value);
}
@Override
public void put(final Class c, final String name, final float value) {
prefs(c).putFloat(key(c, name), value);
}
@Override
public void put(final Class c, final String name, final int value) {
prefs(c).putInt(key(c, name), value);
}
@Override
public void put(final Class c, final String name, final long value) {
prefs(c).putLong(key(c, name), value);
}
@Override
public void clear(final Class c) {
prefs(c).clear();
}
// -- Other/unsorted --
// TODO - Evaluate which of these methods are really needed, and which are
// duplicate of similar functionality above.
@Override
public void clearAll() {
for (final String name : allPrefs())
prefs(name).removeNode();
}
@Override
public void clear(final String key) {
clear((Class) null, key);
}
@Override
public void clear(final Class prefClass, final String key) {
prefs(prefClass).clear(key);
}
@Override
public void clear(final String absolutePath, final String key) {
prefs(absolutePath).clear(key);
}
@Override
public void remove(final Class prefClass, final String key) {
prefs(prefClass).remove(key);
}
@Override
public void remove(final String absolutePath, final String key) {
prefs(absolutePath).remove(key);
}
@Override
public void putMap(final Map map, final String key) {
putMap((Class) null, map, key);
}
@Override
public void putMap(final Class prefClass, final Map map,
final String key)
{
prefs(prefClass).node(key).putMap(map);
}
@Override
public void putMap(final String absolutePath, final Map map,
final String key)
{
prefs(absolutePath).node(key).putMap(map);
}
@Override
public void putMap(final Class prefClass, final Map map) {
prefs(prefClass).putMap(map);
}
@Override
public void putMap(final String absolutePath, final Map map) {
prefs(absolutePath).putMap(map);
}
@Override
public Map getMap(final String key) {
return getMap((Class) null, key);
}
@Override
public Map getMap(final Class prefClass, final String key)
{
return prefs(prefClass).node(key).getMap();
}
@Override
public Map
getMap(final String absolutePath, final String key)
{
return prefs(absolutePath).node(key).getMap();
}
@Override
public Map getMap(final Class prefClass) {
return prefs(prefClass).getMap();
}
@Override
public void putList(final List list, final String key) {
putList((Class) null, list, key);
}
@Override
public void putList(final Class prefClass, final List list,
final String key)
{
prefs(prefClass).node(key).putList(list);
}
@Override
public void putList(final String absolutePath, final List list,
final String key)
{
prefs(absolutePath).node(key).putList(list);
}
@Override
public void putList(final Class prefClass, final List list) {
prefs(prefClass).putList(list);
}
@Override
public void putList(final String absolutePath, final List list) {
prefs(absolutePath).putList(list);
}
@Override
public List getList(final String key) {
return getList((Class) null, key);
}
@Override
public List getList(final Class prefClass, final String key) {
return prefs(prefClass).node(key).getList();
}
@Override
public List getList(final String absolutePath, final String key) {
return prefs(absolutePath).node(key).getList();
}
@Override
public List getList(final Class prefClass) {
return prefs(prefClass).getList();
}
@Override
public Iterable getIterable(final String key) {
return getIterable((Class) null, key);
}
@Override
public Iterable getIterable(final Class prefClass, final String key) {
return prefs(prefClass).node(key).getIterable();
}
@Override
public void putIterable(final Iterable iterable, final String key) {
putIterable((Class) null, iterable, key);
}
@Override
public void putIterable(final Class prefClass, final Iterable iterable, final String key) {
prefs(prefClass).node(key).node(key).putIterable(iterable);
}
// -- Helper methods --
private static String key(final Class c, final String name) {
return c == null ? name : c.getSimpleName() + "." + name;
}
private SmartPrefs prefs(final Class c) {
return new SmartPrefs(java.util.prefs.Preferences.userNodeForPackage(
c == null ? PrefService.class : c), log);
}
private SmartPrefs prefs(final String absolutePath) {
return new SmartPrefs(java.util.prefs.Preferences.userRoot().node(
absolutePath), log);
}
private String[] allPrefs() {
try {
return java.util.prefs.Preferences.userRoot().childrenNames();
}
catch (java.util.prefs.BackingStoreException exc) {
if (log != null) log.error(exc);
return new String[0];
}
}
// -- Helper classes --
/**
* Smart wrapper around {@link java.util.prefs.Preferences} which
* encapsulates, improves and enhances its behavior.
*/
private static class SmartPrefs {
private final java.util.prefs.Preferences p;
private final LogService log;
public SmartPrefs(final java.util.prefs.Preferences p,
final LogService log)
{
this.p = p;
this.log = log;
}
// -- SmartPrefs methods --
public void clear(final String key) {
if (nodeExists(key)) node(key).clear();
}
public void remove(final String key) {
if (nodeExists(key)) node(key).removeNode();
}
public void putMap(final Map map) {
final Iterator> iter = map.entrySet().iterator();
while (iter.hasNext()) {
final Entry entry = iter.next();
final String key = entry.getKey().toString();
final Object value = entry.getValue();
put(key, value);
}
}
public Map getMap() {
final Map map = new HashMap<>();
final String[] keys = keys();
for (int index = 0; index < keys.length; index++) {
map.put(keys[index], get(keys[index]));
}
return map;
}
public void putList(final List list) {
for (int index = 0; list != null && index < list.size(); index++) {
final Object value = list.get(index);
put("" + index, value);
}
}
public List getList() {
final List list = new ArrayList<>();
for (int index = 0; index < 1000; index++) {
final String value = get("" + index);
if (value == null) {
break;
}
list.add(value);
}
return list;
}
public void putIterable(final Iterable iterable) {
int index = 0;
for (final String value : iterable) {
put("" + index++, value);
}
}
public Iterable getIterable() {
return new Iterable() {
@Override
public Iterator iterator() {
return new Iterator() {
private String value;
private int index;
{
findNext();
}
@Override
public String next() {
final String result = value;
findNext();
return result;
}
@Override
public boolean hasNext() {
return value != null;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
private void findNext() {
if (index < 0) return;
value = get("" + index);
index = value == null ? -1 : index + 1;
}
};
}
};
}
// -- Adapted Preferences methods --
/** @see java.util.prefs.Preferences#put */
public void put(final String key, final Object value) {
p.put(safeKey(key), safeValue(value));
}
/** @see java.util.prefs.Preferences#get(String, String) */
public String get(final String key) {
return get(key, null);
}
/** @see java.util.prefs.Preferences#get(String, String) */
public String get(final String key, final String def) {
return p.get(safeKey(key), def);
}
/** @see java.util.prefs.Preferences#clear() */
public void clear() {
try {
p.clear();
}
catch (java.util.prefs.BackingStoreException exc) {
if (log != null) log.error(exc);
}
}
/** @see java.util.prefs.Preferences#putInt(String, int) */
public void putInt(final String key, final int value) {
p.putInt(safeKey(key), value);
}
/** @see java.util.prefs.Preferences#getInt(String, int) */
public int getInt(final String key, final int def) {
return p.getInt(safeKey(key), def);
}
/** @see java.util.prefs.Preferences#putLong(String, long) */
public void putLong(final String key, final long value) {
p.putLong(safeKey(key), value);
}
/** @see java.util.prefs.Preferences#getLong(String, long) */
public long getLong(final String key, final long def) {
return p.getLong(safeKey(key), def);
}
/** @see java.util.prefs.Preferences#putBoolean(String, boolean) */
public void putBoolean(final String key, final boolean value) {
p.putBoolean(safeKey(key), value);
}
/** @see java.util.prefs.Preferences#getFloat(String, float) */
public boolean getBoolean(final String key, final boolean def) {
return p.getBoolean(safeKey(key), def);
}
/** @see java.util.prefs.Preferences#putFloat(String, float) */
public void putFloat(final String key, final float value) {
p.putFloat(safeKey(key), value);
}
/** @see java.util.prefs.Preferences#getFloat(String, float) */
public float getFloat(final String key, final float def) {
return p.getFloat(safeKey(key), def);
}
/** @see java.util.prefs.Preferences#putDouble(String, double) */
public void putDouble(final String key, final double value) {
p.putDouble(safeKey(key), value);
}
/** @see java.util.prefs.Preferences#getDouble(String, double) */
public double getDouble(final String key, final double def) {
return p.getDouble(safeKey(key), def);
}
/** @see java.util.prefs.Preferences#keys() */
public String[] keys() {
try {
final String[] keys = p.keys();
for (int i = 0; i < keys.length; i++) {
keys[i] = safeKey(keys[i]);
}
return keys;
}
catch (final java.util.prefs.BackingStoreException exc) {
if (log != null) log.error(exc);
return new String[0];
}
}
/** @see java.util.prefs.Preferences#node(String) */
public SmartPrefs node(final String pathName) {
return new SmartPrefs(p.node(safeName(pathName)), log);
}
/** @see java.util.prefs.Preferences#nodeExists(String) */
public boolean nodeExists(final String pathName) {
try {
return p.nodeExists(safeName(pathName));
}
catch (final java.util.prefs.BackingStoreException exc) {
if (log != null) log.error(exc);
return false;
}
}
/** @see java.util.prefs.Preferences#removeNode() */
public void removeNode() {
try {
p.removeNode();
}
catch (final java.util.prefs.BackingStoreException exc) {
if (log != null) log.error(exc);
}
}
// -- Helper methods --
private String safeKey(final String key) {
return makeSafe(key, java.util.prefs.Preferences.MAX_KEY_LENGTH);
}
private String safeValue(final Object value) {
if (value == null) return null;
return makeSafe(value.toString(),
java.util.prefs.Preferences.MAX_VALUE_LENGTH);
}
private String safeName(final String name) {
return makeSafe(name, java.util.prefs.Preferences.MAX_NAME_LENGTH);
}
/**
* This method limits the given string to the specified maximum length using
* its latter characters prepended with "..." as needed.
*
* This is necessary because the Java Preferences API does not allow:
*
*
* - Keys longer than {@link java.util.prefs.Preferences#MAX_KEY_LENGTH}
*
* - Values longer than
* {@link java.util.prefs.Preferences#MAX_VALUE_LENGTH}
* - Node names longer than
* {@link java.util.prefs.Preferences#MAX_NAME_LENGTH}
*
*/
private String makeSafe(final String s, final int max) {
final int len = s.length();
if (len < max) return s;
return "..." + s.substring(len - max + 3, len);
}
}
}