/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx;

import java.util.Map;

/** <p>
 * A Preference instance is a hash map holding different values. It is stored alongside your application (SharedPreferences on
 * Android, LocalStorage on GWT, on the desktop a Java Preferences file in a ".prefs" directory will be created, 
 * and on iOS an NSMutableDictonary will be written to the given file). CAUTION: On the desktop platform, all libgdx
 * applications share the same ".prefs" directory.  To avoid collisions use specific names like "com.myname.game1.settings"
 * instead of "settings"
 * </p>
 * 
 * <p>
 * Changes to a preferences instance will be cached in memory until {@link #flush()} is invoked.
 * </p>
 * 
 * <p>
 * Use {@link Application#getPreferences(String)} to look up a specific preferences instance.  Note that 
 * on several backends the preferences name will be used as the filename, so make sure the name is valid
 * for a filename.
 * </p>
 * 
 * @author mzechner */
public interface Preferences {
	public void putBoolean (String key, boolean val);

	public void putInteger (String key, int val);

	public void putLong (String key, long val);

	public void putFloat (String key, float val);

	public void putString (String key, String val);

	public void put (Map<String, ?> vals);

	public boolean getBoolean (String key);

	public int getInteger (String key);

	public long getLong (String key);

	public float getFloat (String key);

	public String getString (String key);

	public boolean getBoolean (String key, boolean defValue);

	public int getInteger (String key, int defValue);

	public long getLong (String key, long defValue);

	public float getFloat (String key, float defValue);

	public String getString (String key, String defValue);

	/** Returns a read only Map<String, Object> with all the key, objects of the preferences. */
	public Map<String, ?> get ();

	public boolean contains (String key);

	public void clear ();

	public void remove (String key);

	/** Makes sure the preferences are persisted. */
	public void flush ();
}
