com.transficc.portals.ParameterDecodingHandler Maven / Gradle / Ivy

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/*
 * Copyright 2017 TransFICC Ltd.
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.  The ASF 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.transficc.portals;

import java.lang.reflect.Field;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;


import io.vertx.ext.web.RoutingContext;

class ParameterDecodingHandler  implements DecodingHandler
{
    private static final Logger LOGGER = LogManager.getLogger();
    private final DecodingHandler handler;

    ParameterDecodingHandler(final DecodingHandler handler)
    {
        this.handler = handler;
    }

    @Override
    public void handle(final RoutingContext event, final T value)
    {
        final Field[] declaredFields = value.getClass().getDeclaredFields();
        for (int i = 0; i < declaredFields.length; i++)
        {
            final boolean privacy = declaredFields[i].isAccessible();
            declaredFields[i].setAccessible(true);
            try
            {
                if (declaredFields[i].isAnnotationPresent(FromUrl.class))
                {
                    final String fieldValue = event.request().getParam(declaredFields[i].getName());
                    declaredFields[i].set(value, fieldValue);
                }
            }
            catch (final IllegalAccessException e)
            {
                LOGGER.warn("Failed to validate field.", e);
            }
            finally
            {
                declaredFields[i].setAccessible(privacy);
            }
        }

        handler.handle(event, value);
    }
}