de.felixschulze.gradle.util.ProgressHttpEntityWrapper.groovy Maven / Gradle / Ivy

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Felix Schulze
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package de.felixschulze.gradle.util;

import org.apache.http.HttpEntity;
import org.apache.http.entity.HttpEntityWrapper;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * HttpEntityWrapper with a progress callback
 *
 * @see http://stackoverflow.com/a/7319110/268795
 */

class ProgressHttpEntityWrapper extends HttpEntityWrapper {

    private final ProgressCallback progressCallback

    public static interface ProgressCallback {
        public void progress(float progress)
    }

    public ProgressHttpEntityWrapper(final HttpEntity entity, final ProgressCallback progressCallback) {
        super(entity);
        this.progressCallback = progressCallback
    }

    @Override
    public void writeTo(final OutputStream out) throws IOException {
        this.wrappedEntity.writeTo(out instanceof ProgressFilterOutputStream ? out : new ProgressFilterOutputStream(out, this.progressCallback, getContentLength()))
    }

    static class ProgressFilterOutputStream extends FilterOutputStream {

        private final ProgressCallback progressCallback;
        private long transferred
        private long totalBytes

        ProgressFilterOutputStream(final OutputStream out, final ProgressCallback progressCallback, final long totalBytes) {
            super(out);
            this.progressCallback = progressCallback
            this.transferred = 0
            this.totalBytes = totalBytes
        }

        @Override
        public void write(final byte[] b, final int off, final int len) throws IOException {
            //super.write(byte b[], int off, int len) calls write(int b)
            out.write(b, off, len)
            this.transferred += len
            this.progressCallback.progress(getCurrentProgress())
        }

        @Override
        public void write(final int b) throws IOException {
            out.write(b)
            this.transferred++
            this.progressCallback.progress(getCurrentProgress())
        }

        private float getCurrentProgress() {
            return ((float) this.transferred / this.totalBytes) * 100
        }

    }

}