Minimal InputStream subclass to fetch bytes form a String

    

/* Copyright (c) 2001-2009, 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.
 */



import java.io.IOException;
import java.io.InputStream;

/**
 * minimal InputStream subclass to fetch bytes form a String
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.7.0
 */
public class StringInputStream extends InputStream {

    protected int    strOffset  = 0;
    protected int    charOffset = 0;
    protected int    available;
    protected String str;

    public StringInputStream(String s) {
        str       = s;
        available = s.length() * 2;
    }

    public int read() throws java.io.IOException {

        if (available == 0) {
            return -1;
        }

        available--;

        char c = str.charAt(strOffset);

        if (charOffset == 0) {
            charOffset = 1;

            return (c & 0x0000ff00) >> 8;
        } else {
            charOffset = 0;

            strOffset++;

            return c & 0x000000ff;
        }
    }

    public int available() throws IOException {
        return available;
    }
}

Related examples in the same category

1.	Creating an input or output stream on a ByteBuffer
2.	Creating a Manifest for a JAR File
3.	Convert InputStream to String
4.	An limited-data-size input stream
5.	An input stream which reads sequentially from multiple sources
6.	Combined InputStream
7.	Size Limit InputStream
8.	Read and return the entire contents of the supplied InputStream. This method always closes the stream when finished reading.
9.	Compare two InputStream
10.	Read and return the entire contents of the supplied InputStream.
11.	Deserializes an object from an input stream.
12.	Reads at most certain bytes from input stream and returns them as a byte array.
13.	Convert Reader to InputStream
14.	A trace of the data that is being retrieved from an input stream
15.	EOLConvertingInputStream: InputStream which converts \r bytes not followed by \n and \n not preceded by \r to \r\n.
16.	A line reading wrapper that works with byte streams.
17.	Smart Encoding InputStream
18.	Wraps a stream that has been exported to import the data in readable form
19.	This input stream wrapper closes the base input stream when fully read.
20.	LZFInputStream and LZFOutputStream
21.	Random input stream

Minimal InputStream subclass to fetch bytes form a String : InputStream « File Input Output « Java

Related examples in the same category