java/org/apache/jasper/runtime/BodyContentImpl.java - tomcat80 - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package org.apache.jasper.runtime;

 import java.io.CharArrayReader;
 import java.io.IOException;
 import java.io.Reader;
 import java.io.Writer;

 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
  * @author Jan Luehe
  */
 public class BodyContentImpl extends BodyContent {

     private static final boolean LIMIT_BUFFER =
         Boolean.parseBoolean(System.getProperty("org.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER", "false"));

     private char[] cb;
     private int nextChar;
     private boolean closed;

     // Enclosed writer to which any output is written
     private Writer writer;

     /**
      * Constructor.
      */
     public BodyContentImpl(JspWriter enclosingWriter) {
         super(enclosingWriter);
         cb = new char[Constants.DEFAULT_TAG_BUFFER_SIZE];
         bufferSize = cb.length;
         nextChar = 0;
         closed = false;
     }

     /**
      * Write a single character.
      */
     @Override
     public void write(int c) throws IOException {
         if (writer != null) {
             writer.write(c);
         } else {
             ensureOpen();
             if (nextChar >= bufferSize) {
                 reAllocBuff (1);
             }
             cb[nextChar++] = (char) c;
         }
     }

     /**
      * 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
      */
     @Override
     public void write(char[] cbuf, int off, int len) throws IOException {
         if (writer != null) {
             writer.write(cbuf, off, len);
         } else {
             ensureOpen();

             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)
                 reAllocBuff (len);

             System.arraycopy(cbuf, off, cb, nextChar, len);
             nextChar+=len;
         }
     }

     /**
      * Write an array of characters.  This method cannot be inherited from the
      * Writer class because it must suppress I/O exceptions.
      */
     @Override
     public void write(char[] buf) throws IOException {
         if (writer != null) {
             writer.write(buf);
         } else {
             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
      */
     @Override
     public void write(String s, int off, int len) throws IOException {
         if (writer != null) {
             writer.write(s, off, len);
         } else {
             ensureOpen();
             if (len >= bufferSize - nextChar)
                 reAllocBuff(len);

             s.getChars(off, off + len, cb, nextChar);
             nextChar += len;
         }
     }

     /**
      * Write a string.  This method cannot be inherited from the Writer class
      * because it must suppress I/O exceptions.
      */
     @Override
     public void write(String s) throws IOException {
         if (writer != null) {
             writer.write(s);
         } else {
             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.
      *
      * @throws IOException If an I/O error occurs
      */
     @Override
     public void newLine() throws IOException {
         if (writer != null) {
             writer.write(System.lineSeparator());
         } else {
             write(System.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 IOException
      */
     @Override
     public void print(boolean b) throws IOException {
         if (writer != null) {
             writer.write(b ? "true" : "false");
         } else {
             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 IOException
      */
     @Override
     public void print(char c) throws IOException {
         if (writer != null) {
             writer.write(String.valueOf(c));
         } else {
             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
      * @throws IOException
      */
     @Override
     public void print(int i) throws IOException {
         if (writer != null) {
             writer.write(String.valueOf(i));
         } else {
             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
      * @throws IOException
      */
     @Override
     public void print(long l) throws IOException {
         if (writer != null) {
             writer.write(String.valueOf(l));
         } else {
             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
      * @throws IOException
      */
     @Override
     public void print(float f) throws IOException {
         if (writer != null) {
             writer.write(String.valueOf(f));
         } else {
             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
      * @throws IOException
      */
     @Override
     public void print(double d) throws IOException {
         if (writer != null) {
             writer.write(String.valueOf(d));
         } else {
             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 IOException
      */
     @Override
     public void print(char[] s) throws IOException {
         if (writer != null) {
             writer.write(s);
         } else {
             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 IOException
      */
     @Override
     public void print(String s) throws IOException {
         if (s == null) s = "null";
         if (writer != null) {
             writer.write(s);
         } else {
             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
      * @throws IOException
      */
     @Override
     public void print(Object obj) throws IOException {
         if (writer != null) {
             writer.write(String.valueOf(obj));
         } else {
             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 IOException
      */
     @Override
     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 IOException
      */
     @Override
     public void println(boolean x) throws IOException {
         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 IOException
      */
     @Override
     public void println(char x) throws IOException {
         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 IOException
      */
     @Override
     public void println(int x) throws IOException {
         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 IOException
      */
     @Override
     public void println(long x) throws IOException {
         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 IOException
      */
     @Override
     public void println(float x) throws IOException {
         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 IOException
      */
     @Override
     public void println(double x) throws IOException{
         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 IOException
      */
     @Override
     public void println(char x[]) throws IOException {
         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 IOException
      */
     @Override
     public void println(String x) throws IOException {
         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 IOException
      */
     @Override
     public void println(Object x) throws IOException {
         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
      */
     @Override
     public void clear() throws IOException {
         if (writer != null) {
             throw new IOException();
         } else {
             nextChar = 0;
             if (LIMIT_BUFFER && (cb.length > Constants.DEFAULT_TAG_BUFFER_SIZE)) {
                 cb = new char[Constants.DEFAULT_TAG_BUFFER_SIZE];
                 bufferSize = cb.length;
             }
         }
     }

     /**
      * Clears the current contents of the buffer. Unlike clear(), this
      * method 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
      */
     @Override
     public void clearBuffer() throws IOException {
         if (writer == null) {
             this.clear();
         }
     }

     /**
      * 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.
      *
      * @throws IOException If an I/O error occurs
      */
     @Override
     public void close() throws IOException {
         if (writer != null) {
             writer.close();
         } else {
             closed = true;
         }
     }

     /**
      * This method returns the size of the buffer used by the JspWriter.
      *
      * @return the size of the buffer in bytes, or 0 is unbuffered.
      */
     @Override
     public int getBufferSize() {
         // According to the spec, the JspWriter returned by
         // JspContext.pushBody(java.io.Writer writer) must behave as
         // though it were unbuffered. This means that its getBufferSize()
         // must always return 0.
         return (writer == null) ? bufferSize : 0;
     }

     /**
      * @return the number of bytes unused in the buffer
      */
     @Override
     public int getRemaining() {
         return (writer == null) ? bufferSize-nextChar : 0;
     }

     /**
      * Return the value of this BodyJspWriter as a Reader.
      * Note: this is after evaluation!!  There are no scriptlets,
      * etc in this stream.
      *
      * @return the value of this BodyJspWriter as a Reader
      */
     @Override
     public Reader getReader() {
         return (writer == null) ? new CharArrayReader (cb, 0, nextChar) : null;
     }

     /**
      * Return the value of the BodyJspWriter as a String.
      * Note: this is after evaluation!!  There are no scriptlets,
      * etc in this stream.
      *
      * @return the value of the BodyJspWriter as a String
      */
     @Override
     public String getString() {
         return (writer == null) ? new String(cb, 0, nextChar) : null;
     }

     /**
      * 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
      */
     @Override
     public void writeOut(Writer out) throws IOException {
         if (writer == null) {
             out.write(cb, 0, nextChar);
             // Flush not called as the writer passed could be a BodyContent and
             // it doesn't allow to flush.
         }
     }

     /**
      * Sets the writer to which all output is written.
      */
     void setWriter(Writer writer) {
         this.writer = writer;
         closed = false;
         if (writer == null) {
             clearBody();
         }
     }

     /**
      * This method shall "reset" the internal state of a BodyContentImpl,
      * releasing all internal references, and preparing it for potential
      * reuse by a later invocation of {@link PageContextImpl#pushBody(Writer)}.
      *
      * <p>Note, that BodyContentImpl instances are usually owned by a
      * PageContextImpl instance, and PageContextImpl instances are recycled
      * and reused.
      *
      * @see PageContextImpl#release()
      */
     protected void recycle() {
         this.writer = null;
         try {
             this.clear();
         } catch (IOException ex) {
             // ignore
         }
     }

     private void ensureOpen() throws IOException {
         if (closed) throw new IOException("Stream closed");
     }

     /**
      * Reallocates buffer since the spec requires it to be unbounded.
      */
     private void reAllocBuff(int len) {

         if (bufferSize + len <= cb.length) {
             bufferSize = cb.length;
             return;
         }

         if (len < cb.length) {
             len = cb.length;
         }

         char[] tmp = new char[cb.length + len];
         System.arraycopy(cb, 0, tmp, 0, cb.length);
         cb = tmp;
         bufferSize = cb.length;
     }


 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package org.apache.jasper.runtime;

	import java.io.CharArrayReader;
	import java.io.IOException;
	import java.io.Reader;
	import java.io.Writer;

	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
	* @author Jan Luehe
	*/
	public class BodyContentImpl extends BodyContent {

	private static final boolean LIMIT_BUFFER =
	Boolean.parseBoolean(System.getProperty("org.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER", "false"));

	private char[] cb;
	private int nextChar;
	private boolean closed;

	// Enclosed writer to which any output is written
	private Writer writer;

	/**
	* Constructor.
	*/
	public BodyContentImpl(JspWriter enclosingWriter) {
	super(enclosingWriter);
	cb = new char[Constants.DEFAULT_TAG_BUFFER_SIZE];
	bufferSize = cb.length;
	nextChar = 0;
	closed = false;
	}

	/**
	* Write a single character.
	*/
	@Override
	public void write(int c) throws IOException {
	if (writer != null) {
	writer.write(c);
	} else {
	ensureOpen();
	if (nextChar >= bufferSize) {
	reAllocBuff (1);
	}
	cb[nextChar++] = (char) c;
	}
	}

	/**
	* 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
	*/
	@Override
	public void write(char[] cbuf, int off, int len) throws IOException {
	if (writer != null) {
	writer.write(cbuf, off, len);
	} else {
	ensureOpen();

	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)
	reAllocBuff (len);

	System.arraycopy(cbuf, off, cb, nextChar, len);
	nextChar+=len;
	}
	}

	/**
	* Write an array of characters. This method cannot be inherited from the
	* Writer class because it must suppress I/O exceptions.
	*/
	@Override
	public void write(char[] buf) throws IOException {
	if (writer != null) {
	writer.write(buf);
	} else {
	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
	*/
	@Override
	public void write(String s, int off, int len) throws IOException {
	if (writer != null) {
	writer.write(s, off, len);
	} else {
	ensureOpen();
	if (len >= bufferSize - nextChar)
	reAllocBuff(len);

	s.getChars(off, off + len, cb, nextChar);
	nextChar += len;
	}
	}

	/**
	* Write a string. This method cannot be inherited from the Writer class
	* because it must suppress I/O exceptions.
	*/
	@Override
	public void write(String s) throws IOException {
	if (writer != null) {
	writer.write(s);
	} else {
	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.
	*
	* @throws IOException If an I/O error occurs
	*/
	@Override
	public void newLine() throws IOException {
	if (writer != null) {
	writer.write(System.lineSeparator());
	} else {
	write(System.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 IOException
	*/
	@Override
	public void print(boolean b) throws IOException {
	if (writer != null) {
	writer.write(b ? "true" : "false");
	} else {
	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 IOException
	*/
	@Override
	public void print(char c) throws IOException {
	if (writer != null) {
	writer.write(String.valueOf(c));
	} else {
	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
	* @throws IOException
	*/
	@Override
	public void print(int i) throws IOException {
	if (writer != null) {
	writer.write(String.valueOf(i));
	} else {
	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
	* @throws IOException
	*/
	@Override
	public void print(long l) throws IOException {
	if (writer != null) {
	writer.write(String.valueOf(l));
	} else {
	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
	* @throws IOException
	*/
	@Override
	public void print(float f) throws IOException {
	if (writer != null) {
	writer.write(String.valueOf(f));
	} else {
	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
	* @throws IOException
	*/
	@Override
	public void print(double d) throws IOException {
	if (writer != null) {
	writer.write(String.valueOf(d));
	} else {
	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 IOException
	*/
	@Override
	public void print(char[] s) throws IOException {
	if (writer != null) {
	writer.write(s);
	} else {
	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 IOException
	*/
	@Override
	public void print(String s) throws IOException {
	if (s == null) s = "null";
	if (writer != null) {
	writer.write(s);
	} else {
	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
	* @throws IOException
	*/
	@Override
	public void print(Object obj) throws IOException {
	if (writer != null) {
	writer.write(String.valueOf(obj));
	} else {
	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 IOException
	*/
	@Override
	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 IOException
	*/
	@Override
	public void println(boolean x) throws IOException {
	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 IOException
	*/
	@Override
	public void println(char x) throws IOException {
	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 IOException
	*/
	@Override
	public void println(int x) throws IOException {
	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 IOException
	*/
	@Override
	public void println(long x) throws IOException {
	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 IOException
	*/
	@Override
	public void println(float x) throws IOException {
	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 IOException
	*/
	@Override
	public void println(double x) throws IOException{
	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 IOException
	*/
	@Override
	public void println(char x[]) throws IOException {
	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 IOException
	*/
	@Override
	public void println(String x) throws IOException {
	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 IOException
	*/
	@Override
	public void println(Object x) throws IOException {
	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
	*/
	@Override
	public void clear() throws IOException {
	if (writer != null) {
	throw new IOException();
	} else {
	nextChar = 0;
	if (LIMIT_BUFFER && (cb.length > Constants.DEFAULT_TAG_BUFFER_SIZE)) {
	cb = new char[Constants.DEFAULT_TAG_BUFFER_SIZE];
	bufferSize = cb.length;
	}
	}
	}

	/**
	* Clears the current contents of the buffer. Unlike clear(), this
	* method 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
	*/
	@Override
	public void clearBuffer() throws IOException {
	if (writer == null) {
	this.clear();
	}
	}

	/**
	* 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.
	*
	* @throws IOException If an I/O error occurs
	*/
	@Override
	public void close() throws IOException {
	if (writer != null) {
	writer.close();
	} else {
	closed = true;
	}
	}

	/**
	* This method returns the size of the buffer used by the JspWriter.
	*
	* @return the size of the buffer in bytes, or 0 is unbuffered.
	*/
	@Override
	public int getBufferSize() {
	// According to the spec, the JspWriter returned by
	// JspContext.pushBody(java.io.Writer writer) must behave as
	// though it were unbuffered. This means that its getBufferSize()
	// must always return 0.
	return (writer == null) ? bufferSize : 0;
	}

	/**
	* @return the number of bytes unused in the buffer
	*/
	@Override
	public int getRemaining() {
	return (writer == null) ? bufferSize-nextChar : 0;
	}

	/**
	* Return the value of this BodyJspWriter as a Reader.
	* Note: this is after evaluation!! There are no scriptlets,
	* etc in this stream.
	*
	* @return the value of this BodyJspWriter as a Reader
	*/
	@Override
	public Reader getReader() {
	return (writer == null) ? new CharArrayReader (cb, 0, nextChar) : null;
	}

	/**
	* Return the value of the BodyJspWriter as a String.
	* Note: this is after evaluation!! There are no scriptlets,
	* etc in this stream.
	*
	* @return the value of the BodyJspWriter as a String
	*/
	@Override
	public String getString() {
	return (writer == null) ? new String(cb, 0, nextChar) : null;
	}

	/**
	* 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
	*/
	@Override
	public void writeOut(Writer out) throws IOException {
	if (writer == null) {
	out.write(cb, 0, nextChar);
	// Flush not called as the writer passed could be a BodyContent and
	// it doesn't allow to flush.
	}
	}

	/**
	* Sets the writer to which all output is written.
	*/
	void setWriter(Writer writer) {
	this.writer = writer;
	closed = false;
	if (writer == null) {
	clearBody();
	}
	}

	/**
	* This method shall "reset" the internal state of a BodyContentImpl,
	* releasing all internal references, and preparing it for potential
	* reuse by a later invocation of {@link PageContextImpl#pushBody(Writer)}.
	*
	* <p>Note, that BodyContentImpl instances are usually owned by a
	* PageContextImpl instance, and PageContextImpl instances are recycled
	* and reused.
	*
	* @see PageContextImpl#release()
	*/
	protected void recycle() {
	this.writer = null;
	try {
	this.clear();
	} catch (IOException ex) {
	// ignore
	}
	}

	private void ensureOpen() throws IOException {
	if (closed) throw new IOException("Stream closed");
	}

	/**
	* Reallocates buffer since the spec requires it to be unbounded.
	*/
	private void reAllocBuff(int len) {

	if (bufferSize + len <= cb.length) {
	bufferSize = cb.length;
	return;
	}

	if (len < cb.length) {
	len = cb.length;
	}

	char[] tmp = new char[cb.length + len];
	System.arraycopy(cb, 0, tmp, 0, cb.length);
	cb = tmp;
	bufferSize = cb.length;
	}


	}