/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.camera.settings;
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import java.util.HashMap;
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/**
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* A class for storing default values and possible values of
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* SharedPreferences settings. It is optional to store defaults
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* and possible values for a setting. If a default is not specified,
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* the SettingsManager API chooses a default based on the type
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* requested:
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*
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* <ul>getString: default is null</ul>
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* <ul>getInteger: default is 0</ul>
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* <ul>getBoolean: default is false</ul>
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*
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* If possible values aren't specified for a
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* SharedPreferences key, then calling getIndexOfCurrentValue
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* and setValueByIndex will throw an IllegalArgumentException.
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*/
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class DefaultsStore {
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/**
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* A class for storing a default value and set of possible
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* values. Since all settings values are saved as Strings in
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* SharedPreferences, the default and possible values are
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* Strings. This simplifies default values management.
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*/
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private static class Defaults {
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private String mDefaultValue;
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private String[] mPossibleValues;
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public Defaults(String defaultValue, String[] possibleValues) {
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mDefaultValue = defaultValue;
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mPossibleValues = possibleValues;
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}
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public String getDefaultValue() {
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return mDefaultValue;
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}
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public String[] getPossibleValues() {
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return mPossibleValues;
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}
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}
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/** Map of Defaults for SharedPreferences keys. */
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private static HashMap<String, Defaults> mDefaultsInternalStore =
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new HashMap<String, Defaults>();
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/**
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* Store a default value and a set of possible values
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* for a SharedPreferences key.
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*/
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public void storeDefaults(String key, String defaultValue, String[] possibleValues) {
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Defaults defaults = new Defaults(defaultValue, possibleValues);
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mDefaultsInternalStore.put(key, defaults);
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}
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/**
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* Get the default value for a SharedPreferences key,
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* if one has been stored.
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*/
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public String getDefaultValue(String key) {
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Defaults defaults = mDefaultsInternalStore.get(key);
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if (defaults == null) {
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return null;
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}
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return defaults.getDefaultValue();
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}
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/**
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* Get the set of possible values for a SharedPreferences key,
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* if a set has been stored.
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*/
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public String[] getPossibleValues(String key) {
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Defaults defaults = mDefaultsInternalStore.get(key);
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if (defaults == null) {
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return null;
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}
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return defaults.getPossibleValues();
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}
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}
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