Reflection.java

/*
 * Copyright (C) 2011 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 com.smartandroid.sa.json.internal.bind;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;

final class Reflection {
	/**
	 * Finds a compatible runtime type if it is more specific
	 */
	public static Type getRuntimeTypeIfMoreSpecific(Type type, Object value) {
		if (value != null
				&& (type == Object.class || type instanceof TypeVariable || type instanceof Class<?>)) {
			type = (Class<?>) value.getClass();
		}
		return type;
	}

	// TODO: this should use Joel's unsafe constructor stuff
	public static <T> T newInstance(Constructor<T> constructor) {
		try {
			Object[] args = null;
			return constructor.newInstance(args);
		} catch (InstantiationException e) {
			// TODO: JsonParseException ?
			throw new RuntimeException(e);
		} catch (InvocationTargetException e) {
			// TODO: don't wrap if cause is unchecked!
			// TODO: JsonParseException ?
			throw new RuntimeException(e.getTargetException());
		} catch (IllegalAccessException e) {
			throw new AssertionError(e);
		}
	}

}