fess/src/main/java/org/codelibs/fess/util/InputStreamThread.java

/*
 * Copyright 2012-2021 CodeLibs Project and the Others.
 *
 * 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 org.codelibs.fess.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.LinkedList;
import java.util.List;
import java.util.function.Consumer;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class InputStreamThread extends Thread {
    private static final Logger logger = LogManager.getLogger(InputStreamThread.class);

    private final BufferedReader br;

    public static final int MAX_BUFFER_SIZE = 1000;

    private final List<String> list = new LinkedList<>();

    private final int bufferSize;

    private final Consumer<String> outputCallback;

    @Deprecated
    public InputStreamThread(final InputStream is, final String charset) {
        this(is, Charset.forName(charset), MAX_BUFFER_SIZE, null);
    }

    public InputStreamThread(final InputStream is, final Charset charset, final int bufferSize, final Consumer<String> outputCallback) {
        super("InputStreamThread");
        this.bufferSize = bufferSize;
        this.outputCallback = outputCallback;

        br = new BufferedReader(new InputStreamReader(is, charset));
    }

    @Override
    public void run() {
        boolean running = true;
        while (running) {
            try {
                final String line = br.readLine();
                if (line == null) {
                    running = false;
                } else {
                    if (logger.isDebugEnabled()) {
                        logger.debug(line);
                    }
                    if (bufferSize > 0) {
                        list.add(line);
                    }
                    if (outputCallback != null) {
                        outputCallback.accept(line);
                    }
                    if (list.size() > bufferSize) {
                        list.remove(0);
                    }
                }
            } catch (final Exception e) {
                running = false;
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to process an input stream.", e);
                }
            }
        }
    }

    public String getOutput() {
        final StringBuilder buf = new StringBuilder(100);
        for (final String value : list) {
            buf.append(value).append("\n");
        }
        return buf.toString();
    }

    public boolean contains(final String value) {
        for (final String line : list) {
            if (line.trim().equals(value)) {
                return true;
            }
        }
        return false;
    }
}