com.marklogic.client.impl.OutputStreamTee Maven / Gradle / Ivy

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/*
 * Copyright 2012-2016 MarkLogic Corporation
 *
 * 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.marklogic.client.impl;

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

public class OutputStreamTee extends OutputStream {
	private OutputStream out;
	private OutputStream tee;
	private long         max  = 0;
	private long         sent = 0;

	public OutputStreamTee(OutputStream out, OutputStream tee, long max) {
		super();
		this.out = out;
		this.tee = tee;
		this.max = max;
	}

	@Override
	public void write(int b) throws IOException {
		if (out == null)
			throw new IOException("Output Stream closed");

		out.write(b);

		if (max == Long.MAX_VALUE) {
			tee.write(b);
			return;
		} else if (sent >= max) {
			return;
		}

		tee.write(b);

		sent++;
		if (sent == max)
			cleanupTee();
	}
	@Override
	public void write(byte[] b) throws IOException {
		if (out == null)
			throw new IOException("Output Stream closed");

		out.write(b);

		writeTee(b, 0, b.length);
	}
	@Override
	public void write(byte[] b, int off, int len) throws IOException {
		if (out == null)
			throw new IOException("Output Stream closed");

		out.write(b, off, len);

		writeTee(b, off, len);
	}
	private void writeTee(byte[] b, int off, int len) throws IOException {
		if (max == Long.MAX_VALUE) {
			tee.write(b, off, len);
			return;
		} else if (sent >= max) {
			return;
		}

		int teeLen = ((sent + len) <= max) ? len : (int) (max - sent);
		sent += teeLen;
		tee.write(b, off, teeLen);

		if (sent >= max)
			cleanupTee();
	}

	@Override
	public void flush() throws IOException {
		if (out == null)
			return;

		out.flush();

		if (tee != null) {
			tee.flush();
		}
	}
	@Override
	public void close() throws IOException {
		if (out == null)
			return;

		out.close();
		out = null;

		cleanupTee();
	}
	private void cleanupTee() throws IOException {
		if (tee == null)
			return;

		tee.flush();
		tee = null;
	}
}