TypeTokenStringConverter.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.Method;
import java.lang.reflect.Type;
/**
* Parse the string format of Guava TypeToken.
* <p>
* This is loaded by reflection only when Guava is on the classpath.
* It relies on internal methods in Guava that could change in any release.
* <p>
* This parser is incomplete, but handles common cases.
* It does not handle union types or multi-dimensional arrays.
*/
final class TypeTokenStringConverter
implements TypedStringConverter<Object> {
static final Class<?> TYPE_TOKEN_CLASS;
static final Method TYPE_TOKEN_METHOD_OF;
static {
try {
// see StringConvert, which adds the necessary read edge for Java 9
TYPE_TOKEN_CLASS = Class.forName("com.google.common.reflect.TypeToken");
TYPE_TOKEN_METHOD_OF = TYPE_TOKEN_CLASS.getDeclaredMethod("of", Type.class);
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
TypeTokenStringConverter() {
}
@Override
public String convertToString(Object object) {
return object.toString();
}
@Override
public Object convertFromString(Class<?> cls, String str) {
Type parsed = TypeUtils.parse(str);
try {
return TYPE_TOKEN_METHOD_OF.invoke(null, parsed);
} catch (Exception ex) {
throw new IllegalArgumentException(ex);
}
}
@Override
public Class<?> getEffectiveType() {
return TYPE_TOKEN_CLASS;
}
}