Java tutorial
/* * Created on Oct 15, 2004 * * The MIT License * Copyright (c) 2004 Stephen Milligan * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the Software * is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package org.cfeclipse.cfml.preferences; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.preference.PreferenceStore; import org.eclipse.jface.text.Assert; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; class OverlayPreferenceStore implements IPreferenceStore { public static final class TypeDescriptor { private TypeDescriptor() { } TypeDescriptor(TypeDescriptor typedescriptor) { this(); } } public static class OverlayKey { TypeDescriptor fDescriptor = null; String fKey = null; public OverlayKey(TypeDescriptor descriptor, String key) { fDescriptor = descriptor; fKey = key; } } private class PropertyListener implements IPropertyChangeListener { public void propertyChange(PropertyChangeEvent event) { OverlayKey key = findOverlayKey(event.getProperty()); if (key != null) propagateProperty(fParent, key, fStore); } PropertyListener() { } } public static final TypeDescriptor BOOLEAN = new TypeDescriptor(null); public static final TypeDescriptor DOUBLE = new TypeDescriptor(null); public static final TypeDescriptor FLOAT = new TypeDescriptor(null); public static final TypeDescriptor INT = new TypeDescriptor(null); public static final TypeDescriptor LONG = new TypeDescriptor(null); public static final TypeDescriptor STRING = new TypeDescriptor(null); private IPreferenceStore fParent = null; private IPreferenceStore fStore = null; private OverlayKey fOverlayKeys[] = null; private PropertyListener fPropertyListener = null; private boolean fLoaded = false; 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 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); //System.out.println("Propogating " + key.fKey + " with a value of " + originValue); 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"); 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; } } public void addPropertyChangeListener(IPropertyChangeListener listener) { fStore.addPropertyChangeListener(listener); } public void removePropertyChangeListener(IPropertyChangeListener listener) { fStore.removePropertyChangeListener(listener); } public void firePropertyChangeEvent(String name, Object oldValue, Object newValue) { fStore.firePropertyChangeEvent(name, oldValue, newValue); } public boolean contains(String name) { return fStore.contains(name); } public boolean getBoolean(String name) { return fStore.getBoolean(name); } public boolean getDefaultBoolean(String name) { return fStore.getDefaultBoolean(name); } public double getDefaultDouble(String name) { return fStore.getDefaultDouble(name); } public float getDefaultFloat(String name) { return fStore.getDefaultFloat(name); } public int getDefaultInt(String name) { return fStore.getDefaultInt(name); } public long getDefaultLong(String name) { return fStore.getDefaultLong(name); } public String getDefaultString(String name) { return fStore.getDefaultString(name); } public double getDouble(String name) { return fStore.getDouble(name); } public float getFloat(String name) { return fStore.getFloat(name); } public int getInt(String name) { return fStore.getInt(name); } public long getLong(String name) { return fStore.getLong(name); } public String getString(String name) { return fStore.getString(name); } public boolean isDefault(String name) { return fStore.isDefault(name); } public boolean needsSaving() { return fStore.needsSaving(); } public void putValue(String name, String value) { if (covers(name)) fStore.putValue(name, value); } public void setDefault(String name, double value) { if (covers(name)) fStore.setDefault(name, value); } public void setDefault(String name, float value) { if (covers(name)) fStore.setDefault(name, value); } public void setDefault(String name, int value) { if (covers(name)) fStore.setDefault(name, value); } public void setDefault(String name, long value) { if (covers(name)) fStore.setDefault(name, value); } public void setDefault(String name, String value) { if (covers(name)) fStore.setDefault(name, value); } public void setDefault(String name, boolean value) { if (covers(name)) fStore.setDefault(name, value); } public void setToDefault(String name) { fStore.setToDefault(name); } public void setValue(String name, double value) { if (covers(name)) fStore.setValue(name, value); } public void setValue(String name, float value) { if (covers(name)) fStore.setValue(name, value); } public void setValue(String name, int value) { if (covers(name)) fStore.setValue(name, value); } public void setValue(String name, long value) { if (covers(name)) fStore.setValue(name, value); } public void setValue(String name, String value) { if (covers(name)) fStore.setValue(name, value); } public void setValue(String name, boolean value) { if (covers(name)) fStore.setValue(name, value); } public void addKeys(OverlayKey keys[]) { Assert.isTrue(!fLoaded, "OverlayPreferenceStore::addKeys()"); Assert.isNotNull(keys, "OverlayPreferenceStore::addKeys()"); int overlayKeysLength = fOverlayKeys.length; OverlayKey result[] = new OverlayKey[keys.length + overlayKeysLength]; int i = 0; for (int length = overlayKeysLength; i < length; i++) result[i] = fOverlayKeys[i]; i = 0; for (int length = keys.length; i < length; i++) result[overlayKeysLength + i] = keys[i]; fOverlayKeys = result; if (fLoaded) load(); } }