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/*
 * Copyright 2013 ArcBees Inc.
 *
 * 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.gwtplatform.dispatch.rest.shared;

import java.util.List;

import com.gwtplatform.dispatch.shared.HasSecured;
import com.gwtplatform.dispatch.shared.TypedAction;

/**
 * An action used by {@link com.gwtplatform.dispatch.rest.client.RestDispatch RestDispatch}.
 * 
 * You will usually want to let GWTP generate your actions by creating services as explained here.
 *
 * @param  the result type.
 */
public interface RestAction extends TypedAction, HasSecured {
    /**
     * Returns the relative path for this action. It should not be prepended by the path annotated with {@link
     * com.gwtplatform.dispatch.rest.client.RestApplicationPath @RestApplicationPath}.
     *
     * @return the relative path for this action.
     */
    String getPath();

    /**
     * @return the {@link com.gwtplatform.dispatch.rest.shared.HttpMethod} designator used to send this action over
     * HTTP.
     */
    HttpMethod getHttpMethod();

    /**
     * @return a {@link List} of the parameters of {@code type} for this action.
     */
    List getParameters(HttpParameter.Type type);

    /**
     * @return The object that will be serialized and used for the body of this action. There are no {@link
     * com.gwtplatform.dispatch.rest.shared.HttpParameter.Type#FORM @FormParam} parameters.
     */
    Object getBodyParam();

    /**
     * Returns the parameterized qualified class name of the body type or null if there are no body
     * parameters. The type returned is a String because it is easier to compare the parameter type
     * information without reflection. This may change later on.
     */
    String getBodyClass();

    /**
     * Returns the parameterized qualified class name of the return type or null if there are no body
     * parameters. The type returned is a String because it is easier to compare the parameter type
     * information without reflection. This may change later on.
     */
    String getResultClass();

    /**
     * Verify if this action contains FORM parameters. {@link #hasBodyParam()} should return {@code false}.
     *
     * @return {@code true} if this method contains form parameters, otherwise {@code false}.
     */
    Boolean hasFormParams();

    /**
     * Verify if this action a body object. {@link #hasFormParams()} should return {@code false}.
     *
     * @return {@code true} if this method contains body object, otherwise {@code false}.
     */
    Boolean hasBodyParam();

    /**
     * Get a list of content types the client is allowed to produce. These content types are usually enumerated in the
     * {@link javax.ws.rs.Consumes @Consumes} annotation.
     */
    List getClientProducedContentTypes();

    /**
     * Get a list of content types the client is allowed to produce. These content types are usually enumerated in the
     * {@link javax.ws.rs.Produces @Produces} annotation.
     */
    List getClientConsumedContentTypes();
}