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HSQLDB example source code file (HsqlByteArrayInputStream.java)

This example HSQLDB source code file (HsqlByteArrayInputStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - HSQLDB tags/keywords

datainput, eofexception, eofexception, hsqlbytearrayinputstream, hsqlbytearrayinputstream, indexoutofboundsexception, inputstream, io, ioexception, ioexception, string, string

The HSQLDB HsqlByteArrayInputStream.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb.lib;

import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;

/**
 * This class is a replacement for both java.io.ByteArrayInputStream
 * (without synchronization) and java.io.DataInputStream
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.7.2
 */
public class HsqlByteArrayInputStream extends InputStream
implements DataInput {

    protected byte[] buffer;
    protected int    pos;
    protected int    mark = 0;
    protected int    count;

    public HsqlByteArrayInputStream(byte[] buf) {

        this.buffer = buf;
        this.pos    = 0;
        this.count  = buf.length;
    }

    public HsqlByteArrayInputStream(byte[] buf, int offset, int length) {

        this.buffer = buf;
        this.pos    = offset;
        this.count  = Math.min(offset + length, buf.length);
        this.mark   = offset;
    }

    // methods that implement java.io.DataInput
    public final void readFully(byte[] b) throws IOException {
        readFully(b, 0, b.length);
    }

    public final void readFully(byte[] b, int off,
                                int len) throws IOException {

        if (len < 0) {
            throw new IndexOutOfBoundsException();
        }

        int n = 0;

        while (n < len) {
            int count = read(b, off + n, len - n);

            if (count < 0) {
                throw new EOFException();
            }

            n += count;
        }
    }

    public final boolean readBoolean() throws IOException {

        int ch = read();

        if (ch < 0) {
            throw new EOFException();
        }

        return (ch != 0);
    }

    public final byte readByte() throws IOException {

        int ch = read();

        if (ch < 0) {
            throw new EOFException();
        }

        return (byte) ch;
    }

    public final int readUnsignedByte() throws IOException {

        int ch = read();

        if (ch < 0) {
            throw new EOFException();
        }

        return ch;
    }

    public short readShort() throws IOException {

        if (count - pos < 2) {
            pos = count;

            throw new EOFException();
        }

        int ch1 = buffer[pos++] & 0xff;
        int ch2 = buffer[pos++] & 0xff;

        return (short) ((ch1 << 8) + (ch2));
    }

    public final int readUnsignedShort() throws IOException {

        int ch1 = read();
        int ch2 = read();

        if ((ch1 | ch2) < 0) {
            throw new EOFException();
        }

        return (ch1 << 8) + (ch2);
    }

    public final char readChar() throws IOException {

        int ch1 = read();
        int ch2 = read();

        if ((ch1 | ch2) < 0) {
            throw new EOFException();
        }

        return (char) ((ch1 << 8) + (ch2));
    }

    public int readInt() throws IOException {

        if (count - pos < 4) {
            pos = count;

            throw new EOFException();
        }

        int ch1 = buffer[pos++] & 0xff;
        int ch2 = buffer[pos++] & 0xff;
        int ch3 = buffer[pos++] & 0xff;
        int ch4 = buffer[pos++] & 0xff;

        return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4));
    }

    public long readLong() throws IOException {
        return (((long) readInt()) << 32) + (((long) readInt()) & 0xffffffffL);
    }

    public final float readFloat() throws IOException {
        return Float.intBitsToFloat(readInt());
    }

    public final double readDouble() throws IOException {
        return Double.longBitsToDouble(readLong());
    }

    public int skipBytes(int n) throws IOException {
        return (int) skip(n);
    }

    public String readLine() throws IOException {

        /** @todo: this will probably be useful */
        throw new java.lang.RuntimeException("not implemented.");
    }

    public String readUTF() throws IOException {

        int bytecount = readUnsignedShort();

        if (pos + bytecount >= count) {
            throw new EOFException();
        }

        String result = StringConverter.readUTF(buffer, pos, bytecount);

        pos += bytecount;

        return result;
    }

// methods that extend java.io.InputStream
    public int read() {
        return (pos < count) ? (buffer[pos++] & 0xff)
                             : -1;
    }

    public int read(byte[] b, int off, int len) {

        if (pos >= count) {
            return -1;
        }

        if (pos + len > count) {
            len = count - pos;
        }

        if (len <= 0) {
            return 0;
        }

        System.arraycopy(buffer, pos, b, off, len);

        pos += len;

        return len;
    }

    public long skip(long n) {

        if (pos + n > count) {
            n = count - pos;
        }

        if (n < 0) {
            return 0;
        }

        pos += n;

        return n;
    }

    public int available() {
        return count - pos;
    }

    public boolean markSupported() {
        return true;
    }

    public void mark(int readAheadLimit) {
        mark = pos;
    }

    public void reset() {
        pos = mark;
    }

    public void close() throws IOException {}
}

Other HSQLDB examples (source code examples)

Here is a short list of links related to this HSQLDB HsqlByteArrayInputStream.java source code file:

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