/*
 * Copyright (C) 2013 Square, 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 retrofit.client;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import retrofit.mime.TypedOutput;

/**
 * Encapsulates all of the information necessary to make an HTTP request.
 */
public final class Request {
    private final String method;
    private final String url;
    private final List<Header> headers;
    private final TypedOutput body;

    public Request(String method, String url, List<Header> headers, TypedOutput body) {
        if (method == null) {
            throw new NullPointerException("Method must not be null.");
        }
        if (url == null) {
            throw new NullPointerException("URL must not be null.");
        }
        this.method = method;
        this.url = url;

        if (headers == null) {
            this.headers = Collections.emptyList();
        } else {
            this.headers = Collections.unmodifiableList(new ArrayList<Header>(headers));
        }

        this.body = body;
    }

    /**
     * HTTP method verb.
     */
    public String getMethod() {
        return method;
    }

    /**
     * Target URL.
     */
    public String getUrl() {
        return url;
    }

    /**
     * Returns an unmodifiable list of headers, never {@code null}.
     */
    public List<Header> getHeaders() {
        return headers;
    }

    /**
     * Returns the request body or {@code null}.
     */
    public TypedOutput getBody() {
        return body;
    }
}