AssetCursorWriter.java

/*******************************************************************************
 * Copyright (c) 2017 IBM Corp.
 *
 * 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.ibm.ws.lars.rest;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.ibm.ws.lars.rest.model.AssetCursor;

/**
 *
 */
@Provider
public class AssetCursorWriter implements MessageBodyWriter<AssetCursor> {

    private static final ObjectMapper MAPPER = new ObjectMapper();

    /** {@inheritDoc} */
    @Override
    public long getSize(AssetCursor arg0, Class<?> arg1, Type arg2, Annotation[] arg3, MediaType arg4) {
        return -1;
    }

    /** {@inheritDoc} */
    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return AssetCursor.class.isAssignableFrom(type) && mediaType.isCompatible(MediaType.APPLICATION_JSON_TYPE);
    }

    /** {@inheritDoc} */
    @Override
    public void writeTo(AssetCursor cursor, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders,
                        OutputStream entityStream) throws IOException {
        try (AssetCursor cursorToBeClosed = cursor) {
            MAPPER.writeValue(entityStream, cursorToBeClosed);
        }
    }
}