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/*
 * Copyright (c) 2024 Contributors to the Eclipse Foundation.
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.enterprise.universal.process;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.nio.charset.Charset;

class ProcessStreamDrainerWorker implements Runnable {

    private final BufferedInputStream reader;
    private final PrintStream redirect;
    private StringBuilder sb;

    ProcessStreamDrainerWorker(InputStream in, PrintStream Redirect, boolean save) {
        if (in == null) {
            throw new NullPointerException("InputStream argument was null.");
        }

        reader = new BufferedInputStream(in);
        redirect = Redirect;

        if (save) {
            sb = new StringBuilder();
        }
    }


    @Override
    public void run() {
        if (reader == null) {
            return;
        }

        try {
            byte[] buffer = new byte[8192];
            Charset charset = Charset.defaultCharset();
            int count = 0;
            while ((count = reader.read(buffer)) != -1) {
                if (redirect != null) {
                    redirect.write(buffer, 0, count);
                }

                if (sb != null) {
                    sb.append(new String(buffer, 0, count, charset));
                }
            }
        } catch (IOException e) {
        }
    }


    String getString() {
        return sb == null ? "" : sb.toString();
    }
}