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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 */
package org.glassfish.jersey.message.internal;

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

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

import javax.inject.Singleton;

import org.glassfish.jersey.internal.util.collection.NullableMultivaluedHashMap;

/**
 * Provider for marshalling/un-marshalling of {@code application/x-www-form-urlencoded}
 * entity type to/from {@link MultivaluedMap multi-valued map} instance.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Produces("application/x-www-form-urlencoded")
@Consumes("application/x-www-form-urlencoded")
@Singleton
public final class FormMultivaluedMapProvider extends AbstractFormProvider> {

    private final Type mapType;

    public FormMultivaluedMapProvider() {
        ParameterizedType iface = (ParameterizedType) this.getClass().getGenericSuperclass();
        mapType = iface.getActualTypeArguments()[0];
    }

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        // Only allow types MultivaluedMap and MultivaluedMap.
        return type == MultivaluedMap.class
                && (type == genericType || mapType.equals(genericType));
    }

    @Override
    public MultivaluedMap readFrom(
            Class> type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap httpHeaders,
            InputStream entityStream) throws IOException {
        return readFrom(new NullableMultivaluedHashMap(), mediaType, true, entityStream);
    }

    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return MultivaluedMap.class.isAssignableFrom(type);
    }

    @Override
    public void writeTo(
            MultivaluedMap t,
            Class type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap httpHeaders,
            OutputStream entityStream) throws IOException {
        writeTo(t, mediaType, entityStream);
    }
}