co.cask.cdap.api.stream.GenericStreamEventData.java Source code

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Here is the source code for co.cask.cdap.api.stream.GenericStreamEventData.java

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/*
 * Copyright  2015 Cask Data, 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 co.cask.cdap.api.stream;

import com.google.common.collect.ImmutableMap;

import java.util.Map;
import javax.annotation.Nonnull;

/**
 * Represents data in one stream event with the body as a specific type.
 *
 * @param <T> Type of the stream body.
 */
@Nonnull
public class GenericStreamEventData<T> {

    private final T body;
    private final Map<String, String> headers;

    /**
     * Constructs a {@link GenericStreamEventData} instance. The given body and headers are taken as-is.
     *
     * @param headers Map of key/value pairs of the event data
     * @param body body of the event data
     */
    public GenericStreamEventData(Map<String, String> headers, T body) {
        this.body = body;
        this.headers = ImmutableMap.copyOf(headers);
    }

    /**
     * @return An immutable map of all headers included in this event.
     */
    public Map<String, String> getHeaders() {
        return headers;
    }

    /**
     * @return The payload of the event.
     */
    public T getBody() {
        return body;
    }
}