/**
* Copyright 2010 Google Inc.
*
* 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 org.waveprotocol.wave.client.util;
public final class ClientFlagsBaseHelper {
private final TypedSource source;
/**
* This class is package-private and designed to be used by ClientFlags and
* ClientFlagsBase only.
*
* @param source source containing parameters
*/
ClientFlagsBaseHelper(TypedSource source) {
this.source = source;
}
/**
* Helper that returns a if a is not null, else returns b.
* NOTE(user): Does such function already exist?
*/
private <T> T returnDefaultHelper(T a, T b) {
return a != null ? a : b;
}
/**
* Get the parameter from source, if null return default value.
*/
public Boolean getBoolean(String tag, Boolean defaultValue) {
return returnDefaultHelper(source.getBoolean(tag), defaultValue);
}
/**
* Get the parameter from source, if null return default value.
*/
public String getString(String tag, String defaultValue) {
return returnDefaultHelper(source.getString(tag), defaultValue);
}
/**
* Get the parameter from source, if null return default value.
*/
public Integer getInteger(String tag, Integer defaultValue) {
return returnDefaultHelper(source.getInteger(tag), defaultValue);
}
/**
* Get the parameter from source, if null return default value.
*/
public Double getDouble(String tag, Double defaultValue) {
return returnDefaultHelper(source.getDouble(tag), defaultValue);
}
}