/* * 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;
/** * 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. * * This needs revisiting when the buffering problems in the JSP spec * are fixed -akv * * @author Anil K. Vijendran
*/ publicclass JspWriterImpl extends JspWriter {
public JspWriterImpl() { super( Constants.DEFAULT_BUFFER_SIZE, true );
}
/** * Create a new buffered character-output stream that uses an output * buffer of the given size. * * @param response A Servlet Response * @param sz Output-buffer size, a positive integer * @param autoFlush <code>true</code> to automatically flush on buffer * full, <code>false</code> to throw an overflow exception in that case * @exception IllegalArgumentException If sz is <= 0
*/ public JspWriterImpl(ServletResponse response, int sz, boolean autoFlush) { super(sz, autoFlush); if (sz < 0) { thrownew IllegalArgumentException(Localizer.getMessage("jsp.error.negativeBufferSize"));
} this.response = response;
cb = sz == 0 ? null : newchar[sz];
nextChar = 0;
}
/** * Flush the output buffer to the underlying character stream, without * flushing the stream itself. This method is non-private only so that it * may be invoked by PrintStream. * @throws IOException Error writing buffered data
*/ protectedfinalvoid flushBuffer() throws IOException { if (bufferSize == 0) { return;
}
flushed = true;
ensureOpen(); if (nextChar == 0) { return;
}
initOut();
out.write(cb, 0, nextChar);
nextChar = 0;
}
privatevoid initOut() throws IOException { if (out == null) {
out = response.getWriter();
}
}
/** * Discard the output buffer.
*/
@Override publicfinalvoid clear() throws IOException { if ((bufferSize == 0) && (out != null)) { // clear() is illegal after any unbuffered output (JSP.5.5) thrownew IllegalStateException(
Localizer.getMessage("jsp.error.ise_on_clear"));
} if (flushed) { thrownew IOException(
Localizer.getMessage("jsp.error.attempt_to_clear_flushed_buffer"));
}
ensureOpen();
nextChar = 0;
}
/** * Close the stream. *
*/
@Override publicvoid close() throws IOException { if (response == null || closed) { // multiple calls to close is OK return;
}
flush(); if (out != null) {
out.close();
}
out = null;
closed = true;
}
/** * @return the number of bytes unused in the buffer
*/
@Override publicint getRemaining() { return bufferSize - nextChar;
}
/** check to make sure that the stream has not been closed */ privatevoid ensureOpen() throws IOException { if (response == null || closed) { thrownew IOException(Localizer.getMessage("jsp.error.stream.closed"));
}
}
/** * Write a single character.
*/
@Override publicvoid write(int c) throws IOException {
ensureOpen(); if (bufferSize == 0) {
initOut();
out.write(c);
} else { if (nextChar >= bufferSize) { if (autoFlush) {
flushBuffer();
} else {
bufferOverflow();
}
}
cb[nextChar++] = (char) c;
}
}
/** * 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.
*/ privatestaticint 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
*/
@Override publicvoid write(char cbuf[], int off, int len) throws IOException
{
ensureOpen();
if (len >= bufferSize) { /* If the request length exceeds the size of the output buffer, flush the buffer and then write the data directly. In this
way buffered streams will cascade harmlessly. */ if (autoFlush) {
flushBuffer();
} else {
bufferOverflow();
}
initOut();
out.write(cbuf, off, len); return;
}
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) { if (autoFlush) {
flushBuffer();
} else {
bufferOverflow();
}
}
}
}
/** * Write an array of characters. This method cannot be inherited from the * Writer class because it must suppress I/O exceptions.
*/
@Override publicvoid 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
*/
@Override publicvoid write(String s, int off, int len) throws IOException {
ensureOpen(); if (bufferSize == 0) {
initOut();
out.write(s, off, len); return;
} 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) { if (autoFlush) {
flushBuffer();
} else {
bufferOverflow();
}
}
}
}
/** * Write a line separator. The line separator string is defined by the * system property <code>line.separator</code>, and is not necessarily a * single newline ('\n') character. * * @exception IOException If an I/O error occurs
*/
/** * Print a boolean value. The string produced by <code>{@link * 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
*/
@Override publicvoid 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
*/
@Override publicvoid print(char c) throws IOException {
write(String.valueOf(c));
}
/** * Print an integer. The string produced by <code>{@link * 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
*/
@Override publicvoid print(int i) throws IOException {
write(String.valueOf(i));
}
/** * Print a long integer. The string produced by <code>{@link * 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
*/
@Override publicvoid print(long l) throws IOException {
write(String.valueOf(l));
}
/** * Print a floating-point number. The string produced by <code>{@link * 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
*/
@Override publicvoid print(float f) throws IOException {
write(String.valueOf(f));
}
/** * Print a double-precision floating-point number. The string produced by * <code>{@link 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
*/
@Override publicvoid 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>
*/
@Override publicvoid 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
*/
@Override publicvoid print(String s) throws IOException { if (s == null) {
s = "null";
}
write(s);
}
/** * Print an object. The string produced by the <code>{@link * 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
*/
@Override publicvoid print(Object obj) throws IOException {
write(String.valueOf(obj));
}
/* Methods that do terminate lines */
/** * 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>). * * Need to change this from PrintWriter because the default * println() writes to the sink directly instead of through the * write method...
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid 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>.
*/
@Override publicvoid println(Object x) throws IOException {
print(x);
println();
}
}
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