/*
* Ext GWT 2.2.0 - Ext for GWT
* Copyright(c) 2007-2010, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
package com.extjs.gxt.ui.client.state;
import java.util.Date;
import java.util.Map;
import com.extjs.gxt.ui.client.core.FastMap;
import com.extjs.gxt.ui.client.event.BaseObservable;
import com.extjs.gxt.ui.client.event.Events;
import com.extjs.gxt.ui.client.event.StateEvent;
import com.extjs.gxt.ui.client.js.JsonConverter;
/**
* Abstract base class for state provider implementations. This class provides
* methods for encoding and decoding objects.
*/
public abstract class Provider extends BaseObservable {
protected StateManager manager;
/**
* Clears a value.
*
* @param name the key name
*/
public void clear(String name) {
clearKey(name);
StateEvent se = new StateEvent(manager);
se.setName(name);
fireEvent(Events.StateChange, se);
}
/**
* Returns the current value for a key.
*
* @param name the key name
* @return the value
*/
public Object get(String name) {
String val = getValue(name);
if (val == null) return null;
Object obj = JsonConverter.decode(val).get("state");
return obj;
}
/**
* Returns the current value for a key.
*
* @param name the key name
* @return the value
*/
public boolean getBoolean(String name) {
String val = getValue(name);
if (val == null) return false;
Boolean bVal = (Boolean) JsonConverter.decode(val).get("state");
return bVal.booleanValue();
}
/**
* Returns the current value for a key.
*
* @param name the key name
* @return the value
*/
public Date getDate(String name) {
String val = getValue(name);
if (val == null) return null;
Date date = (Date) JsonConverter.decode(val).get("state");
return date;
}
/**
* Returns the current value for a key.
*
* @param name the key name
* @return the value or -1
*/
public int getInteger(String name) {
String val = getValue(name);
Integer iVal = (Integer) JsonConverter.decode(val).get("state");
if (iVal == null) {
return -1;
}
return iVal.intValue();
}
@SuppressWarnings({"unchecked", "rawtypes"})
public Map<String, Object> getMap(String name) {
String val = getValue(name);
if (val == null) return null;
Map<String, Object> map = (Map) JsonConverter.decode(val).get("state");
return map;
}
/**
* Returns the current value for a key.
*
* @param name the key name
* @return the value
*/
public String getString(String name) {
String val = getValue(name);
if (val == null) return null;
String obj = (String) JsonConverter.decode(val).get("state");
return obj;
}
/**
* Sets a key.
*
* @param name the key name
* @param value the value
*/
public void set(String name, Object value) {
Map<String, Object> map = new FastMap<Object>();
map.put("state", value);
setValue(name, JsonConverter.encode(map).toString());
StateEvent re = new StateEvent(manager, name, value);
re.setName(name);
re.setValue(value);
fireEvent(Events.StateChange, re);
}
protected void bind(StateManager manager) {
this.manager = manager;
}
protected abstract void clearKey(String name);
protected abstract String getValue(String name);
protected abstract void setValue(String name, String value);
}