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From a..@hyperreal.org
Subject cvs commit: jakarta-tomcat/src/share/org/apache/jasper/runtime BodyContentImpl.java BodyJspWriterImpl.java
Date Thu, 14 Oct 1999 04:08:24 GMT
akv         99/10/13 21:08:24

  Added:       src/share/org/apache/jasper/runtime BodyContentImpl.java
  Removed:     src/share/org/apache/jasper/runtime BodyJspWriterImpl.java
  Log:
  Goodbye, BodyJspWriter.
  
  Revision  Changes    Path
  1.1                  jakarta-tomcat/src/share/org/apache/jasper/runtime/BodyContentImpl.java
  
  Index: BodyContentImpl.java
  ===================================================================
  /*
   * $Id: BodyContentImpl.java,v 1.1 1999/10/14 04:08:19 akv Exp $
   * $Revision: 1.1 $
   * $Date: 1999/10/14 04:08:19 $
   *
   * ====================================================================
   * 
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999 The Apache Software Foundation.  All rights 
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. 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.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
   * ITS 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 software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */ 
  
  package org.apache.jasper.runtime;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.io.Reader;
  import java.io.CharArrayReader;
  import java.io.PrintWriter;
  
  import javax.servlet.ServletResponse;
  import javax.servlet.jsp.JspWriter;
  import javax.servlet.jsp.tagext.BodyContent;
  
  import org.apache.jasper.Constants;
  
  /**
   * Write text to a character-output stream, buffering characters so as
   * to provide for the efficient writing of single characters, arrays,
   * and strings. 
   *
   * Provide support for discarding for the output that has been buffered. 
   *
   * @author Rajiv Mordani
   */
  public class BodyContentImpl extends BodyContent {
  
      private char[] cb;
      protected int bufferSize = Constants.DEFAULT_BUFFER_SIZE;
      private int nextChar;
      static String lineSeparator = System.getProperty("line.separator");
  
  
      public BodyContentImpl (JspWriter writer) {
          super(writer);
  	cb = new char[bufferSize];
  	nextChar = 0;
      }
  
      /**
       * Write a single character.
       *
       */
      public void write(int c) throws IOException {
          synchronized (lock) {
              if (nextChar >= bufferSize) {
  	        reAllocBuff (0);
  	    }
              cb[nextChar++] = (char) c;
          }
      }
  
      private void reAllocBuff (int len) {
          //Need to re-allocate the buffer since it is to be
  	//unbounded according to the updated spec..
          char[] tmp = new char [bufferSize];
  	System.arraycopy(cb, 0, tmp, 0, cb.length);
  	//XXX Should it be multiple of DEFAULT_BUFFER_SIZE??
  	if (len < Constants.DEFAULT_BUFFER_SIZE) {
  	    cb = new char [bufferSize + Constants.DEFAULT_BUFFER_SIZE];
  	    bufferSize += Constants.DEFAULT_BUFFER_SIZE;
  	} else {
  	    cb = new char [bufferSize + len];
  	    bufferSize += len;
  	}
  	System.arraycopy(tmp, 0, cb, 0, tmp.length);
  	tmp = null;
      }
  
      /**
       * Our own little min method, to avoid loading java.lang.Math if we've run
       * out of file descriptors and we're trying to print a stack trace.
       */
      private int min(int a, int b) {
  	if (a < b) return a;
  	return b;
      }
  
      /**
       * Write a portion of an array of characters.
       *
       * <p> Ordinarily this method stores characters from the given array into
       * this stream's buffer, flushing the buffer to the underlying stream as
       * needed.  If the requested length is at least as large as the buffer,
       * however, then this method will flush the buffer and write the characters
       * directly to the underlying stream.  Thus redundant
       * <code>DiscardableBufferedWriter</code>s will not copy data unnecessarily.
       *
       * @param  cbuf  A character array
       * @param  off   Offset from which to start reading characters
       * @param  len   Number of characters to write
       *
       */
      public void write(char cbuf[], int off, int len) 
          throws IOException 
      {
          synchronized (lock) {
  
              if ((off < 0) || (off > cbuf.length) || (len < 0) ||
                  ((off + len) > cbuf.length) || ((off + len) < 0)) {
                  throw new IndexOutOfBoundsException();
              } else if (len == 0) {
                  return;
              } 
  
              if (len >= bufferSize - nextChar) {
                  /* If the request length exceeds the size of the output buffer,
                     re-allocate atleast the length of the buffer. */
  		   reAllocBuff (len);
              }
  
              int b = off, t = off + len;
              while (b < t) {
                  int d = min(bufferSize - nextChar, t - b);
                  System.arraycopy(cbuf, b, cb, nextChar, d);
                  b += d;
                  nextChar += d;
                  if (nextChar >= bufferSize) 
  		    reAllocBuff(0);
              }
          }
      }
  
      /**
       * Write an array of characters.  This method cannot be inherited from the
       * Writer class because it must suppress I/O exceptions.
       */
      public void write(char buf[]) throws IOException {
  	write(buf, 0, buf.length);
      }
  
      /**
       * Write a portion of a String.
       *
       * @param  s     String to be written
       * @param  off   Offset from which to start reading characters
       * @param  len   Number of characters to be written
       *
       */
      public void write(String s, int off, int len) throws IOException {
          synchronized (lock) {
              int b = off, t = off + len;
              while (b < t) {
                  int d = min(bufferSize - nextChar, t - b);
                  s.getChars(b, b + d, cb, nextChar);
                  b += d;
                  nextChar += d;
                  if (nextChar >= bufferSize) 
  		    reAllocBuff(0);
              }
          }
      }
  
      /**
       * Write a string.  This method cannot be inherited from the Writer class
       * because it must suppress I/O exceptions.
       */
      public void write(String s) throws IOException {
  	write(s, 0, s.length());
      }
  
  
      /**
       * Write a line separator.  The line separator string is defined by the
       * system property <tt>line.separator</tt>, and is not necessarily a single
       * newline ('\n') character.
       *
       * @exception  IOException  If an I/O error occurs
       */
  
      public void newLine() throws IOException {
  	synchronized (lock) {
  	    write(lineSeparator);
  	}
      }
  
      /**
       * Print a boolean value.  The string produced by <code>{@link
       * java.lang.String#valueOf(boolean)}</code> is translated into bytes
       * according to the platform's default character encoding, and these bytes
       * are written in exactly the manner of the <code>{@link
       * #write(int)}</code> method.
       *
       * @param      b   The <code>boolean</code> to be printed
       * @throws	   java.io.IOException
       */
  
      public void print(boolean b) throws IOException {
  	write(b ? "true" : "false");
      }
  
      /**
       * Print a character.  The character is translated into one or more bytes
       * according to the platform's default character encoding, and these bytes
       * are written in exactly the manner of the <code>{@link
       * #write(int)}</code> method.
       *
       * @param      c   The <code>char</code> to be printed
       * @throws	   java.io.IOException
       */
  
      public void print(char c) throws IOException {
  	write(String.valueOf(c));
      }
  
      /**
       * Print an integer.  The string produced by <code>{@link
       * java.lang.String#valueOf(int)}</code> is translated into bytes according
       * to the platform's default character encoding, and these bytes are
       * written in exactly the manner of the <code>{@link #write(int)}</code>
       * method.
       *
       * @param      i   The <code>int</code> to be printed
       * @see        java.lang.Integer#toString(int)
       * @throws	   java.io.IOException
       */
  
      public void print(int i) throws IOException {
  	write(String.valueOf(i));
      }
  
      /**
       * Print a long integer.  The string produced by <code>{@link
       * java.lang.String#valueOf(long)}</code> is translated into bytes
       * according to the platform's default character encoding, and these bytes
       * are written in exactly the manner of the <code>{@link #write(int)}</code>
       * method.
       *
       * @param      l   The <code>long</code> to be printed
       * @see        java.lang.Long#toString(long)
       * @throws	   java.io.IOException
       */
  
      public void print(long l) throws IOException {
  	write(String.valueOf(l));
      }
  
      /**
       * Print a floating-point number.  The string produced by <code>{@link
       * java.lang.String#valueOf(float)}</code> is translated into bytes
       * according to the platform's default character encoding, and these bytes
       * are written in exactly the manner of the <code>{@link #write(int)}</code>
       * method.
       *
       * @param      f   The <code>float</code> to be printed
       * @see        java.lang.Float#toString(float)
       * @throws	   java.io.IOException
       */
  
      public void print(float f) throws IOException {
  	write(String.valueOf(f));
      }
  
      /**
       * Print a double-precision floating-point number.  The string produced by
       * <code>{@link java.lang.String#valueOf(double)}</code> is translated into
       * bytes according to the platform's default character encoding, and these
       * bytes are written in exactly the manner of the <code>{@link
       * #write(int)}</code> method.
       *
       * @param      d   The <code>double</code> to be printed
       * @see        java.lang.Double#toString(double)
       * @throws	   java.io.IOException
       */
  
      public void print(double d) throws IOException {
  	write(String.valueOf(d));
      }
  
      /**
       * Print an array of characters.  The characters are converted into bytes
       * according to the platform's default character encoding, and these bytes
       * are written in exactly the manner of the <code>{@link #write(int)}</code>
       * method.
       *
       * @param      s   The array of chars to be printed
       *
       * @throws  NullPointerException  If <code>s</code> is <code>null</code>
       * @throws	   java.io.IOException
       */
  
      public void print(char s[]) throws IOException {
  	write(s);
      }
  
      /**
       * Print a string.  If the argument is <code>null</code> then the string
       * <code>"null"</code> is printed.  Otherwise, the string's characters are
       * converted into bytes according to the platform's default character
       * encoding, and these bytes are written in exactly the manner of the
       * <code>{@link #write(int)}</code> method.
       *
       * @param      s   The <code>String</code> to be printed
       * @throws	   java.io.IOException
       */
  
      public void print(String s) throws IOException {
  	if (s == null) {
  	    s = "null";
  	}
  	write(s);
      }
  
      /**
       * Print an object.  The string produced by the <code>{@link
       * java.lang.String#valueOf(Object)}</code> method is translated into bytes
       * according to the platform's default character encoding, and these bytes
       * are written in exactly the manner of the <code>{@link #write(int)}</code>
       * method.
       *
       * @param      obj   The <code>Object</code> to be printed
       * @see        java.lang.Object#toString()
       * @throws	   java.io.IOException
       */
  
      public void print(Object obj) throws IOException {
  	write(String.valueOf(obj));
      }
  
      /**
       * Terminate the current line by writing the line separator string.  The
       * line separator string is defined by the system property
       * <code>line.separator</code>, and is not necessarily a single newline
       * character (<code>'\n'</code>).
       * @throws	   java.io.IOException
       */
  
      public void println() throws IOException {
  	newLine();
      }
  
      /**
       * Print a boolean value and then terminate the line.  This method behaves
       * as though it invokes <code>{@link #print(boolean)}</code> and then
       * <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(boolean x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print a character and then terminate the line.  This method behaves as
       * though it invokes <code>{@link #print(char)}</code> and then <code>{@link
       * #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(char x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print an integer and then terminate the line.  This method behaves as
       * though it invokes <code>{@link #print(int)}</code> and then <code>{@link
       * #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(int x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print a long integer and then terminate the line.  This method behaves
       * as though it invokes <code>{@link #print(long)}</code> and then
       * <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(long x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print a floating-point number and then terminate the line.  This method
       * behaves as though it invokes <code>{@link #print(float)}</code> and then
       * <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(float x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print a double-precision floating-point number and then terminate the
       * line.  This method behaves as though it invokes <code>{@link
       * #print(double)}</code> and then <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(double x) throws IOException{
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print an array of characters and then terminate the line.  This method
       * behaves as though it invokes <code>{@link #print(char[])}</code> and
then
       * <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(char x[]) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print a String and then terminate the line.  This method behaves as
       * though it invokes <code>{@link #print(String)}</code> and then
       * <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(String x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Print an Object and then terminate the line.  This method behaves as
       * though it invokes <code>{@link #print(Object)}</code> and then
       * <code>{@link #println()}</code>.
       * @throws	   java.io.IOException
       */
  
      public void println(Object x) throws IOException {
  	synchronized (lock) {
  	    print(x);
  	    println();
  	}
      }
  
      /**
       * Clear the contents of the buffer. If the buffer has been already
       * been flushed then the clear operation shall throw an IOException
       * to signal the fact that some data has already been irrevocably 
       * written to the client response stream.
       *
       * @throws IOException		If an I/O error occurs
       */
  
      public void clear() throws IOException {
      }
  
      /**
       * Clears the current contents of the buffer. Unlike clear(), this
       * mehtod will not throw an IOException if the buffer has already been
       * flushed. It merely clears the current content of the buffer and
       * returns.
       *
       * @throws IOException		If an I/O error occurs
       */
  
      public void clearBuffer() throws IOException {
      }
  
      /**
       * Flush the stream.  If the stream has saved any characters from the
       * various write() methods in a buffer, write them immediately to their
       * intended destination.  Then, if that destination is another character or
       * byte stream, flush it.  Thus one flush() invocation will flush all the
       * buffers in a chain of Writers and OutputStreams.
       *
       * @exception  IOException  If an I/O error occurs
       */
  
      public void flush()  throws IOException {
      }
  
      /**
       * Close the stream, flushing it first.  Once a stream has been closed,
       * further write() or flush() invocations will cause an IOException to be
       * thrown.  Closing a previously-closed stream, however, has no effect.
       *
       * @exception  IOException  If an I/O error occurs
       */
  
      public void close() throws IOException {
      }
  
      /**
       * @return the number of bytes unused in the buffer
       */
  
      public int getRemaining() {
          return bufferSize - nextChar;
      }
  
      /**
       * Return the value of this BodyJspWriter as a Reader.
       * Note: this is after evaluation!!  There are no scriptlets,
       * etc in this stream.
       *
       * @returns the value of this BodyJspWriter as a Reader
       */
      public Reader getReader() {
  	//XXX need to optimize this
  	    char[] tmp = new char [ nextChar - 1];
  	    for (int i=0; i < tmp.length; i++) 
  	        tmp[i] = cb[i];	
  	    return new CharArrayReader (tmp);
      }
  
      /**
       * Return the value of the BodyJspWriter as a String.
       * Note: this is after evaluation!!  There are no scriptlets,
       * etc in this stream.
       *
       * @returns the value of the BodyJspWriter as a String
       */
      public String getString() {
  	//XXX need to optimize this
  	    char[] tmp = new char [ nextChar - 1];
  	    for (int i=0; i < tmp.length; i++) 
  	        tmp[i] = cb[i];	
  	    return new String (tmp);
      }
  	
      /**
       * Write the contents of this BodyJspWriter into a Writer.
       * Subclasses are likely to do interesting things with the
       * implementation so some things are extra efficient.
       *
       * @param out The writer into which to place the contents of
       * this body evaluation
       */
      public void writeOut(Writer out) {
  	try {
              out.write (cb);
  	} catch (IOException ioe) {
  	    //What do we do here???	
  	}
      }
  
      public void clearBody() {
          nextChar = 0;
  	cb = null;
  	bufferSize = Constants.DEFAULT_BUFFER_SIZE;
      }
  
      public static void main (String[] args) throws Exception {
  	char[] buff = {'f','o','o','b','a','r','b','a','z','y'};
     	BodyContentImpl bodyContent = new BodyContentImpl(new JspWriterImpl(
  							null, 100, false));
  	bodyContent.println (buff);
  	System.out.println (bodyContent.getString ());
  	bodyContent.writeOut (new PrintWriter (System.out));
      }
  }
  
  
  

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