Java tutorial
/* * Copyright (C) 2007 SQL Explorer Development Team * http://sourceforge.net/projects/eclipsesql * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package net.sourceforge.sqlexplorer.preferences; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.preference.PreferenceStore; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; public class OverlayPreferenceStore implements IPreferenceStore { public static final class TypeDescriptor { 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 { TypeDescriptor fDescriptor; String fKey; 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); } }; IPreferenceStore fParent; IPreferenceStore fStore; private OverlayKey[] fOverlayKeys; private PropertyListener fPropertyListener; public OverlayPreferenceStore(IPreferenceStore parent, OverlayKey[] overlayKeys) { fParent = parent; fOverlayKeys = overlayKeys; fStore = new PreferenceStore(); } 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); } 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); } 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); } }