[Pydev-cvs] org.python.pydev.core/src/org/python/pydev/core/cache PyPreferencesCache.java,NONE,1.1

[Fabio Z. <fa...@us...>]

Update of /cvsroot/pydev/org.python.pydev.core/src/org/python/pydev/core/cache
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv10488/src/org/python/pydev/core/cache

Added Files:
	PyPreferencesCache.java 
Log Message:


--- NEW FILE: PyPreferencesCache.java ---
package org.python.pydev.core.cache;

import java.util.HashMap;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;

public class PyPreferencesCache implements IPropertyChangeListener {

	private IPreferenceStore preferenceStore;
	private HashMap<String, Object> cache = new HashMap<String, Object>();
	
	public PyPreferencesCache(IPreferenceStore preferenceStore) {
		this.preferenceStore = preferenceStore;
		this.preferenceStore.addPropertyChangeListener(this);
	}

	public boolean getBoolean(String key) {
		Boolean b = (Boolean) cache.get(key);
		if(b == null){
			b = this.preferenceStore.getBoolean(key);
			cache.put(key, b);
		}
		return b;
	}
	
	public int getInt(String key) {
		Integer b = (Integer) cache.get(key);
		if(b == null){
			b = this.preferenceStore.getInt(key);
			cache.put(key, b);
		}
		return b;
	}

	public void propertyChange(PropertyChangeEvent event) {
		final Object newValue = event.getNewValue();
		cache.put(event.getProperty(), newValue); //simply override the cache (do not care about whether it is null, Boolean, etc).
	}

	/**
	 * Can be used to force clearing some value from the cache.
	 */
	public void clear(String key) {
		cache.put(key, null); 
	}

}