Java example source code file (StringContent.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebuffer, charset, illegalstateexception, ioexception, mime, nio, printwriter, string, stringcontent, stringwriter, us\-ascii

The StringContent.java Java example source code

/*
 * Copyright (c) 2004, 2011, Oracle and/or its affiliates. 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 Oracle 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 THE COPYRIGHT OWNER 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.
 */

/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */


import java.io.*;
import java.nio.*;
import java.nio.charset.*;

/**
 * A Content type that provides for transferring Strings.
 *
 * @author Mark Reinhold
 * @author Brad R. Wetmore
 */
class StringContent implements Content {

    private static Charset ascii = Charset.forName("US-ASCII");

    private String type;                // MIME type
    private String content;

    StringContent(CharSequence c, String t) {
        content = c.toString();
        if (!content.endsWith("\n"))
            content += "\n";
        type = t + "; charset=iso-8859-1";
    }

    StringContent(CharSequence c) {
        this(c, "text/plain");
    }

    StringContent(Exception x) {
        StringWriter sw = new StringWriter();
        x.printStackTrace(new PrintWriter(sw));
        type = "text/plain; charset=iso-8859-1";
        content = sw.toString();
    }

    public String type() {
        return type;
    }

    private ByteBuffer bb = null;

    private void encode() {
        if (bb == null)
            bb = ascii.encode(CharBuffer.wrap(content));
    }

    public long length() {
        encode();
        return bb.remaining();
    }

    public void prepare() {
        encode();
        bb.rewind();
    }

    public boolean send(ChannelIO cio) throws IOException {
        if (bb == null)
            throw new IllegalStateException();
        cio.write(bb);

        return bb.hasRemaining();
    }

    public void release() throws IOException {
    }
}