// =================================================================================================
// Copyright 2011 Twitter, Inc.
// -------------------------------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this work except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file, or 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.twitter.common.args.parsers;
import java.lang.reflect.Type;
import java.util.List;
import com.google.common.base.Preconditions;
import com.twitter.common.args.ArgParser;
import com.twitter.common.args.ParserOracle;
import com.twitter.common.args.TypeUtil;
/**
* Class parser.
*
* @author William Farner
*/
@ArgParser
public class ClassParser extends TypeParameterizedParser<Class<?>> {
public ClassParser() {
super(1);
}
@Override
public Class<?> doParse(ParserOracle parserOracle, String raw, final List<Type> typeParams) {
Class<?> rawClassType = TypeUtil.getRawType(typeParams.get(0));
try {
Class<?> actualClass = Class.forName(raw);
Preconditions.checkArgument(rawClassType.isAssignableFrom(actualClass));
return actualClass;
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Could not find class " + raw);
}
}
}