TypeStringConverterFactory.java
/*
* Copyright 2010-present Stephen Colebourne
*
* 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.joda.convert;
import java.lang.reflect.Type;
/**
* Factory for {@code StringConverter} looking up types.
* <p>
* This class is immutable and thread-safe.
* <p>
* This parses the string format of Type.
* <p>
* This is achieved thanks to some code copied from Guava.
* (A Guava dependency is painful when building a Java 6 library for Java 9)
* <p>
* This parser is incomplete, but handles common cases.
* It does not handle union types or multi-dimensional arrays.
*/
final class TypeStringConverterFactory
implements StringConverterFactory {
/**
* Singleton instance.
*/
static final TypeStringConverterFactory INSTANCE = new TypeStringConverterFactory();
/**
* Restricted constructor.
*/
private TypeStringConverterFactory() {
}
//-----------------------------------------------------------------------
/**
* Finds a converter by type.
*
* @param cls the type to lookup, not null
* @return the converter, null if not found
* @throws RuntimeException (or subclass) if source code is invalid
*/
@Override
public StringConverter<?> findConverter(Class<?> cls) {
if (Type.class.isAssignableFrom(cls) && cls != Class.class) {
return new TypeStringConverter(cls);
}
return null;
}
//-----------------------------------------------------------------------
@Override
public String toString() {
return getClass().getSimpleName();
}
//-----------------------------------------------------------------------
static final class TypeStringConverter implements TypedStringConverter<Type> {
private final Class<?> effectiveType;
TypeStringConverter(Class<?> effectiveType) {
this.effectiveType = effectiveType;
}
@Override
public String convertToString(Type type) {
try {
return Types.toString(type);
} catch (Exception ex) {
return type.toString();
}
}
@Override
public Type convertFromString(Class<? extends Type> cls, String str) {
return TypeUtils.parse(str);
}
@Override
public Class<?> getEffectiveType() {
return effectiveType;
}
}
}