Deserializers.java

/*
 * Copyright 2016 LINE Corporation
 *
 * LINE Corporation licenses this file to you 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.linecorp.armeria.server.http.dynamic;

/**
 * Provides deserializing functionality for reflection.
 *
 * @see Path
 * @see PathParam
 * @see DynamicHttpServiceBuilder
 */
final class Deserializers {

    /**
     * Deserialize given {@code str} to {@code T} type object. e.g., "42" -> 42.
     *
     * @throws IllegalArgumentException if {@code str} can't be deserialized to {@code T} type object.
     */
    @SuppressWarnings("unchecked")
    static <T> T deserialize(String str, Class<T> clazz) {
        try {
            if (clazz == Byte.TYPE) {
                return (T) Byte.valueOf(str);
            } else if (clazz == Short.TYPE) {
                return (T) Short.valueOf(str);
            } else if (clazz == Boolean.TYPE) {
                return (T) Boolean.valueOf(str);
            } else if (clazz == Integer.TYPE) {
                return (T) Integer.valueOf(str);
            } else if (clazz == Long.TYPE) {
                return (T) Long.valueOf(str);
            } else if (clazz == Float.TYPE) {
                return (T) Float.valueOf(str);
            } else if (clazz == Double.TYPE) {
                return (T) Double.valueOf(str);
            } else if (clazz == String.class) {
                return (T) str;
            } else {
                throw new IllegalArgumentException(
                        "Class " + clazz.getSimpleName() + " can't be deserialized.");
            }
        } catch (Exception e) {
            throw new IllegalArgumentException(
                    "Can't deserialize " + str + " to type " + clazz.getSimpleName(), e);
        }
    }

    private Deserializers() {}
}