/*******************************************************************************
* Copyright (c) 2006, 2008 Wind River Systems, Inc. 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
*
* Contributors:
* Michael Scharf (Wind River) - initial API and implementation
*******************************************************************************/
package com.netifera.platform.host.terminal.ui.view.internal;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.tm.internal.terminal.provisional.api.ISettingsStore;
import org.eclipse.ui.IMemento;
/**
* A {@link IDialogSettings} based {@link ISettingsStore}.
*
* Setting Store based on IMemento. IMemento documentations says only alpha numeric
* values may be used as keys. Therefore the implementation converts dots (.) into
* child elements of the memento.
*
* @author Michael Scharf
*/
public class SettingsStore implements ISettingsStore {
private static final String KEYS = "_keys_"; //$NON-NLS-1$
final private Map fMap=new HashMap();
public SettingsStore(IMemento memento) {
if(memento==null)
return;
// load all keys ever used from the memento
String keys=memento.getString(KEYS);
if(keys!=null) {
String[] keyNames=keys.split(","); //$NON-NLS-1$
for (int i = 0; i < keyNames.length; i++) {
String key=keyNames[i];
if(!KEYS.equals(key)) {
// get the dot separated elements
String[] path=key.split("\\."); //$NON-NLS-1$
IMemento m=memento;
// iterate over all but the last segment and get the children...
for(int iPath=0; m!=null && iPath+1<path.length; iPath++) {
m=m.getChild(path[iPath]);
}
if(m!=null) {
// cache the value in the map
fMap.put(key,m.getString(path[path.length-1]));
}
}
}
}
}
public String get(String key) {
return get(key,null);
}
public String get(String key, String defaultValue) {
String value = (String) fMap.get(key);
if ((value == null) || (value.equals(""))) //$NON-NLS-1$
return defaultValue;
return value;
}
public void put(String key, String value) {
if(!key.matches("^[\\w.]+$")) //$NON-NLS-1$
throw new IllegalArgumentException("Key '"+key+"' is not alpha numeric or '.'!"); //$NON-NLS-1$ //$NON-NLS-2$
// null values remove the key from the map
if ((value == null) || (value.equals(""))) //$NON-NLS-1$
fMap.remove(key);
else
fMap.put(key, value);
}
/**
* Save the state into memento.
*
* @param memento Memento to save state into.
*/
public void saveState(IMemento memento) {
String[] keyNames=(String[]) fMap.keySet().toArray(new String[fMap.size()]);
Arrays.sort(keyNames);
StringBuffer buffer=new StringBuffer();
for (int i = 0; i < keyNames.length; i++) {
String key=keyNames[i];
String[] path=key.split("\\."); //$NON-NLS-1$
IMemento m=memento;
// iterate over all but the last segment and get the children...
for(int iPath=0; iPath+1<path.length; iPath++) {
IMemento child=m.getChild(path[iPath]);
// if the child does not exist, create it
if(child==null)
child=m.createChild(path[iPath]);
m=child;
}
// use the last element in path as key of the child memento
m.putString(path[path.length-1], (String) fMap.get(key));
// construct the string for the keys
if(i>0)
buffer.append(","); //$NON-NLS-1$
buffer.append(key);
}
// save the keys we have used.
memento.putString(KEYS, buffer.toString());
}
}