com.tussle.stream.PipeBufferReader.java Source code

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Here is the source code for com.tussle.stream.PipeBufferReader.java

Source

/*
 * Copyright (c) 2017 eaglgenes101
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.tussle.stream;

import org.apache.commons.math3.util.FastMath;

import java.io.Reader;

//Please, use the loader method of PipeBufferWriter to get new PipeBufferReaders
//This class won't work if instantiated directly
public class PipeBufferReader extends Reader {
    StringBuilder buffer;
    PipeBufferWriter writer;

    PipeBufferReader(PipeBufferWriter out) {
        buffer = new StringBuilder();
        out.open(this);
        writer = out;
    }

    public void append(char[] buf, int off, int len) {
        buffer.append(buf, off, len);
    }

    public void close() {
        writer.close(this);
    }

    public int read(char[] buf, int off, int len) {
        if (buffer.length() == 0)
            return -1;
        int tryLen = FastMath.min(len, buffer.length());
        buffer.getChars(0, tryLen, buf, off);
        buffer.delete(0, tryLen);
        return tryLen;
    }

    public boolean ready() {
        return buffer.length() > 0;
    }

    public PipeBufferWriter getWriter() {
        return writer;
    }
}