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Vaadin Upload

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/*
 * Copyright 2000-2017 Vaadin Ltd.
 *
 * 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.vaadin.flow.component.upload;

import com.vaadin.flow.component.ComponentEvent;

/**
 * ProgressUpdateEvent is sent to track progress of upload.
 *
 * @author Vaadin Ltd.
 */
public class ProgressUpdateEvent extends ComponentEvent {

    /**
     * Bytes transferred.
     */
    private final long readBytes;

    /**
     * Total size of file currently being uploaded, -1 if unknown
     */
    private final long contentLength;

    /**
     * Event constructor method to construct a new progress event.
     *
     * @param source
     *            the source of the file
     * @param readBytes
     *            bytes transferred
     * @param contentLength
     *            total size of file currently being uploaded, -1 if unknown
     */
    public ProgressUpdateEvent(Upload source, long readBytes,
            long contentLength) {
        super(source, false);
        this.readBytes = readBytes;
        this.contentLength = contentLength;
    }

    /**
     * Upload where the event occurred.
     *
     * @return the Source of the event
     */
    public Upload getUpload() {
        return getSource();
    }

    /**
     * Get bytes transferred for this update.
     *
     * @return bytes transferred
     */
    public long getReadBytes() {
        return readBytes;
    }

    /**
     * Get total file size.
     *
     * @return total file size or -1 if unknown
     */
    public long getContentLength() {
        return contentLength;
    }
}