/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
*******************************************************************************/
package org.eclipse.dltk.ui.preferences;
import java.util.List;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceStore;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
/**
* An overlaying preference store.
*/
public class OverlayPreferenceStore implements IPreferenceStore {
public static final class TypeDescriptor {
private TypeDescriptor() {
}
}
public static final TypeDescriptor BOOLEAN = new TypeDescriptor();
public static final TypeDescriptor DOUBLE = new TypeDescriptor();
public static final TypeDescriptor FLOAT = new TypeDescriptor();
public static final TypeDescriptor INT = new TypeDescriptor();
public static final TypeDescriptor LONG = new TypeDescriptor();
public static final TypeDescriptor STRING = new TypeDescriptor();
public static class OverlayKey {
final TypeDescriptor fDescriptor;
final String fKey;
public OverlayKey(TypeDescriptor descriptor, String key) {
fDescriptor = descriptor;
fKey = key;
}
public String getKey() {
return fKey;
}
}
private class PropertyListener implements IPropertyChangeListener {
/*
* @see IPropertyChangeListener#propertyChange(PropertyChangeEvent)
*/
@Override
public void propertyChange(PropertyChangeEvent event) {
OverlayKey key = findOverlayKey(event.getProperty());
if (key != null)
propagateProperty(fParent, key, fStore);
}
}
private IPreferenceStore fParent;
private IPreferenceStore fStore;
private OverlayKey[] fOverlayKeys;
private PropertyListener fPropertyListener;
private boolean fLoaded;
/**
* @since 2.0
*/
public OverlayPreferenceStore(IPreferenceStore parent) {
this(parent, new OverlayKey[0]);
}
public OverlayPreferenceStore(IPreferenceStore parent,
OverlayKey[] overlayKeys) {
fParent = parent;
fOverlayKeys = overlayKeys;
fStore = new PreferenceStore();
}
private OverlayKey findOverlayKey(String key) {
for (int i = 0; i < fOverlayKeys.length; i++) {
if (fOverlayKeys[i].fKey.equals(key))
return fOverlayKeys[i];
}
return null;
}
private boolean covers(String key) {
return (findOverlayKey(key) != null);
}
private static void propagateProperty(IPreferenceStore orgin,
OverlayKey key, IPreferenceStore target) {
if (orgin.isDefault(key.fKey)) {
if (!target.isDefault(key.fKey))
target.setToDefault(key.fKey);
return;
}
TypeDescriptor d = key.fDescriptor;
if (BOOLEAN == d) {
boolean originValue = orgin.getBoolean(key.fKey);
boolean targetValue = target.getBoolean(key.fKey);
if (targetValue != originValue)
target.setValue(key.fKey, originValue);
} else if (DOUBLE == d) {
double originValue = orgin.getDouble(key.fKey);
double targetValue = target.getDouble(key.fKey);
if (targetValue != originValue)
target.setValue(key.fKey, originValue);
} else if (FLOAT == d) {
float originValue = orgin.getFloat(key.fKey);
float targetValue = target.getFloat(key.fKey);
if (targetValue != originValue)
target.setValue(key.fKey, originValue);
} else if (INT == d) {
int originValue = orgin.getInt(key.fKey);
int targetValue = target.getInt(key.fKey);
if (targetValue != originValue)
target.setValue(key.fKey, originValue);
} else if (LONG == d) {
long originValue = orgin.getLong(key.fKey);
long targetValue = target.getLong(key.fKey);
if (targetValue != originValue)
target.setValue(key.fKey, originValue);
} else if (STRING == d) {
String originValue = orgin.getString(key.fKey);
String targetValue = target.getString(key.fKey);
if (targetValue != null && originValue != null
&& !targetValue.equals(originValue))
target.setValue(key.fKey, originValue);
}
}
public void propagate() {
for (int i = 0; i < fOverlayKeys.length; i++)
propagateProperty(fStore, fOverlayKeys[i], fParent);
}
private void loadProperty(IPreferenceStore orgin, OverlayKey key,
IPreferenceStore target, boolean forceInitialization) {
TypeDescriptor d = key.fDescriptor;
if (BOOLEAN == d) {
if (forceInitialization)
target.setValue(key.fKey, true);
target.setValue(key.fKey, orgin.getBoolean(key.fKey));
target.setDefault(key.fKey, orgin.getDefaultBoolean(key.fKey));
} else if (DOUBLE == d) {
if (forceInitialization)
target.setValue(key.fKey, 1.0D);
target.setValue(key.fKey, orgin.getDouble(key.fKey));
target.setDefault(key.fKey, orgin.getDefaultDouble(key.fKey));
} else if (FLOAT == d) {
if (forceInitialization)
target.setValue(key.fKey, 1.0F);
target.setValue(key.fKey, orgin.getFloat(key.fKey));
target.setDefault(key.fKey, orgin.getDefaultFloat(key.fKey));
} else if (INT == d) {
if (forceInitialization)
target.setValue(key.fKey, 1);
target.setValue(key.fKey, orgin.getInt(key.fKey));
target.setDefault(key.fKey, orgin.getDefaultInt(key.fKey));
} else if (LONG == d) {
if (forceInitialization)
target.setValue(key.fKey, 1L);
target.setValue(key.fKey, orgin.getLong(key.fKey));
target.setDefault(key.fKey, orgin.getDefaultLong(key.fKey));
} else if (STRING == d) {
if (forceInitialization)
target.setValue(key.fKey, "1"); //$NON-NLS-1$
target.setValue(key.fKey, orgin.getString(key.fKey));
target.setDefault(key.fKey, orgin.getDefaultString(key.fKey));
}
}
public void load() {
for (int i = 0; i < fOverlayKeys.length; i++)
loadProperty(fParent, fOverlayKeys[i], fStore, true);
fLoaded = true;
}
public void loadDefaults() {
for (int i = 0; i < fOverlayKeys.length; i++)
setToDefault(fOverlayKeys[i].fKey);
}
public void start() {
if (fPropertyListener == null) {
fPropertyListener = new PropertyListener();
fParent.addPropertyChangeListener(fPropertyListener);
}
}
public void stop() {
if (fPropertyListener != null) {
fParent.removePropertyChangeListener(fPropertyListener);
fPropertyListener = null;
}
}
@Override
public void addPropertyChangeListener(IPropertyChangeListener listener) {
fStore.addPropertyChangeListener(listener);
}
@Override
public void removePropertyChangeListener(IPropertyChangeListener listener) {
fStore.removePropertyChangeListener(listener);
}
@Override
public void firePropertyChangeEvent(String name, Object oldValue,
Object newValue) {
fStore.firePropertyChangeEvent(name, oldValue, newValue);
}
@Override
public boolean contains(String name) {
return fStore.contains(name);
}
@Override
public boolean getBoolean(String name) {
return fStore.getBoolean(name);
}
@Override
public boolean getDefaultBoolean(String name) {
return fStore.getDefaultBoolean(name);
}
@Override
public double getDefaultDouble(String name) {
return fStore.getDefaultDouble(name);
}
@Override
public float getDefaultFloat(String name) {
return fStore.getDefaultFloat(name);
}
@Override
public int getDefaultInt(String name) {
return fStore.getDefaultInt(name);
}
@Override
public long getDefaultLong(String name) {
return fStore.getDefaultLong(name);
}
@Override
public String getDefaultString(String name) {
return fStore.getDefaultString(name);
}
@Override
public double getDouble(String name) {
return fStore.getDouble(name);
}
@Override
public float getFloat(String name) {
return fStore.getFloat(name);
}
@Override
public int getInt(String name) {
return fStore.getInt(name);
}
@Override
public long getLong(String name) {
return fStore.getLong(name);
}
@Override
public String getString(String name) {
return fStore.getString(name);
}
@Override
public boolean isDefault(String name) {
return fStore.isDefault(name);
}
@Override
public boolean needsSaving() {
return fStore.needsSaving();
}
@Override
public void putValue(String name, String value) {
if (covers(name))
fStore.putValue(name, value);
}
@Override
public void setDefault(String name, double value) {
if (covers(name))
fStore.setDefault(name, value);
}
@Override
public void setDefault(String name, float value) {
if (covers(name))
fStore.setDefault(name, value);
}
@Override
public void setDefault(String name, int value) {
if (covers(name))
fStore.setDefault(name, value);
}
@Override
public void setDefault(String name, long value) {
if (covers(name))
fStore.setDefault(name, value);
}
@Override
public void setDefault(String name, String value) {
if (covers(name))
fStore.setDefault(name, value);
}
@Override
public void setDefault(String name, boolean value) {
if (covers(name))
fStore.setDefault(name, value);
}
@Override
public void setToDefault(String name) {
fStore.setToDefault(name);
}
@Override
public void setValue(String name, double value) {
if (covers(name))
fStore.setValue(name, value);
}
@Override
public void setValue(String name, float value) {
if (covers(name))
fStore.setValue(name, value);
}
@Override
public void setValue(String name, int value) {
if (covers(name))
fStore.setValue(name, value);
}
@Override
public void setValue(String name, long value) {
if (covers(name))
fStore.setValue(name, value);
}
@Override
public void setValue(String name, String value) {
if (covers(name))
fStore.setValue(name, value);
}
@Override
public void setValue(String name, boolean value) {
if (covers(name))
fStore.setValue(name, value);
}
/**
* The keys to add to the list of overlay keys.
* <p>
* Note: This method must be called before {@link #load()} is called.
* </p>
*
* @param keys
* @since 3.0
*/
public void addKeys(List<OverlayKey> keys) {
addKeys(keys.toArray(new OverlayKey[keys.size()]));
}
/**
* The keys to add to the list of overlay keys.
* <p>
* Note: This method must be called before {@link #load()} is called.
* </p>
*
* @param keys
* @since 3.0
*/
public void addKeys(OverlayKey[] keys) {
Assert.isTrue(!fLoaded);
Assert.isNotNull(keys);
int overlayKeysLength = fOverlayKeys.length;
OverlayKey[] result = new OverlayKey[keys.length + overlayKeysLength];
for (int i = 0, length = overlayKeysLength; i < length; i++)
result[i] = fOverlayKeys[i];
for (int i = 0, length = keys.length; i < length; i++)
result[overlayKeysLength + i] = keys[i];
fOverlayKeys = result;
if (fLoaded)
load();
}
}