dorkbox.executor.stream.TeeOutputStream.kt Maven / Gradle / Ivy

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/*
 * Copyright 2020 dorkbox, llc
 * Copyright (C) 2019 Ketan Padegaonkar 
 *
 * 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 dorkbox.executor.stream

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

/**
 * Splits an OutputStream into two.
 *
 * Named after the unix 'tee' command.
 *
 * It allows a stream to be branched off so there are now two streams.
 */
class TeeOutputStream(private val left: OutputStream, private val right: OutputStream) : OutputStream() {

    /**
     * Write a byte array to both output streams.
     *
     * @param b the data.
     * @param off the start offset in the data.
     * @param len the number of bytes to write.
     *
     * @throws IOException on error.
     */
    @Throws(IOException::class)
    override fun write(b: ByteArray, off: Int, len: Int) {
        left.write(b, off, len)
        right.write(b, off, len)
    }

    /**
     * Write a byte to both output streams.
     *
     * @param b the byte to write.
     *
     * @throws IOException on error.
     */
    @Throws(IOException::class)
    override fun write(b: Int) {
        left.write(b)
        right.write(b)
    }

    /**
     * Write a byte array to both output streams.
     *
     * @param b an array of bytes.
     *
     * @throws IOException on error.
     */
    @Throws(IOException::class)
    override fun write(b: ByteArray) {
        left.write(b)
        right.write(b)
    }

    /**
     * Closes both output streams
     *
     * @throws IOException on error.
     */
    @Throws(IOException::class)
    override fun close() {
        try {
            left.close()
        } finally {
            right.close()
        }
    }

    /**
     * Flush both output streams.
     *
     * @throws IOException on error
     */
    @Throws(IOException::class)
    override fun flush() {
        left.flush()
        right.flush()
    }

}