    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005//     http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012package org.apache.tapestry5.rest.jackson.internal;
    013
    014import java.io.IOException;
    015import java.util.Set;
    016
    017import javax.servlet.http.HttpServletRequest;
    018
    019import org.apache.tapestry5.commons.internal.util.TapestryException;
    020import org.apache.tapestry5.http.services.HttpRequestBodyConverter;
    021import org.apache.tapestry5.jacksondatabind.services.ObjectMapperSource;
    022import org.apache.tapestry5.services.rest.MappedEntityManager;
    023
    024public class JacksonHttpRequestBodyConverter implements HttpRequestBodyConverter {
    025
    026    final private Set<Class<?>> entities;
    027
    028    final private ObjectMapperSource objectMapperSource;
    029
    030    public JacksonHttpRequestBodyConverter(MappedEntityManager mappedEntityManager,
    031            ObjectMapperSource objectMapperSource)
    032    {
    033        this.entities = mappedEntityManager.getEntities();
    034        this.objectMapperSource = objectMapperSource;
    035    }
    036
    037    @Override
    038    public <T> T convert(HttpServletRequest request, Class<T> type) {
    039
    040        T value = null;
    041        if (entities.contains(type))
    042        {
    043            try {
    044                value = objectMapperSource.get(type).readValue(request.getReader(), type);
    045            } catch (IOException e) {
    046                throw new TapestryException("Exception while converting HTTP request body into " + type.getName(), e);
    047            }
    048        }
    049
    050        return value;
    051    }
    052
    053}