/*
* 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 javax.servlet;
import java.io.
CharConversionException;
import java.io.
IOException;
import java.io.
OutputStream;
import java.text.
MessageFormat;
import java.util.
ResourceBundle;
/**
* Provides an output stream for sending binary data to the client. A
* <code>ServletOutputStream</code> object is normally retrieved via the
* {@link ServletResponse#getOutputStream} method.
* <p>
* This is an abstract class that the servlet container implements. Subclasses
* of this class must implement the <code>java.io.OutputStream.write(int)</code>
* method.
*
* @see ServletResponse
*/
public abstract class
ServletOutputStream extends
OutputStream {
private static final
String LSTRING_FILE = "javax.servlet.LocalStrings";
private static final
ResourceBundle lStrings =
ResourceBundle.
getBundle(
LSTRING_FILE);
/**
* Does nothing, because this is an abstract class.
*/
protected
ServletOutputStream() {
// NOOP
}
/**
* Writes a <code>String</code> to the client, without a carriage
* return-line feed (CRLF) character at the end.
*
* @param s
* the <code>String</code> to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(
String s) throws
IOException {
if (
s == null)
s = "null";
int
len =
s.
length();
for (int
i = 0;
i <
len;
i++) {
char
c =
s.
charAt(
i);
//
// XXX NOTE: This is clearly incorrect for many strings,
// but is the only consistent approach within the current
// servlet framework. It must suffice until servlet output
// streams properly encode their output.
//
if ((
c & 0xff00) != 0) { // high order byte must be zero
String errMsg =
lStrings.
getString("err.not_iso8859_1");
Object[]
errArgs = new
Object[1];
errArgs[0] =
Character.
valueOf(
c);
errMsg =
MessageFormat.
format(
errMsg,
errArgs);
throw new
CharConversionException(
errMsg);
}
write(
c);
}
}
/**
* Writes a <code>boolean</code> value to the client, with no carriage
* return-line feed (CRLF) character at the end.
*
* @param b
* the <code>boolean</code> value to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(boolean
b) throws
IOException {
String msg;
if (
b) {
msg =
lStrings.
getString("value.true");
} else {
msg =
lStrings.
getString("value.false");
}
print(
msg);
}
/**
* Writes a character to the client, with no carriage return-line feed
* (CRLF) at the end.
*
* @param c
* the character to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(char
c) throws
IOException {
print(
String.
valueOf(
c));
}
/**
* Writes an int to the client, with no carriage return-line feed (CRLF) at
* the end.
*
* @param i
* the int to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(int
i) throws
IOException {
print(
String.
valueOf(
i));
}
/**
* Writes a <code>long</code> value to the client, with no carriage
* return-line feed (CRLF) at the end.
*
* @param l
* the <code>long</code> value to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(long
l) throws
IOException {
print(
String.
valueOf(
l));
}
/**
* Writes a <code>float</code> value to the client, with no carriage
* return-line feed (CRLF) at the end.
*
* @param f
* the <code>float</code> value to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(float
f) throws
IOException {
print(
String.
valueOf(
f));
}
/**
* Writes a <code>double</code> value to the client, with no carriage
* return-line feed (CRLF) at the end.
*
* @param d
* the <code>double</code> value to send to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
print(double
d) throws
IOException {
print(
String.
valueOf(
d));
}
/**
* Writes a carriage return-line feed (CRLF) to the client.
*
* @exception IOException
* if an input or output exception occurred
*/
public void
println() throws
IOException {
print("\r\n");
}
/**
* Writes a <code>String</code> to the client, followed by a carriage
* return-line feed (CRLF).
*
* @param s
* the <code>String</code> to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(
String s) throws
IOException {
print(
s);
println();
}
/**
* Writes a <code>boolean</code> value to the client, followed by a carriage
* return-line feed (CRLF).
*
* @param b
* the <code>boolean</code> value to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(boolean
b) throws
IOException {
print(
b);
println();
}
/**
* Writes a character to the client, followed by a carriage return-line feed
* (CRLF).
*
* @param c
* the character to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(char
c) throws
IOException {
print(
c);
println();
}
/**
* Writes an int to the client, followed by a carriage return-line feed
* (CRLF) character.
*
* @param i
* the int to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(int
i) throws
IOException {
print(
i);
println();
}
/**
* Writes a <code>long</code> value to the client, followed by a carriage
* return-line feed (CRLF).
*
* @param l
* the <code>long</code> value to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(long
l) throws
IOException {
print(
l);
println();
}
/**
* Writes a <code>float</code> value to the client, followed by a carriage
* return-line feed (CRLF).
*
* @param f
* the <code>float</code> value to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(float
f) throws
IOException {
print(
f);
println();
}
/**
* Writes a <code>double</code> value to the client, followed by a carriage
* return-line feed (CRLF).
*
* @param d
* the <code>double</code> value to write to the client
* @exception IOException
* if an input or output exception occurred
*/
public void
println(double
d) throws
IOException {
print(
d);
println();
}
/**
* Checks if a non-blocking write will succeed. If this returns
* <code>false</code>, it will cause a callback to
* {@link WriteListener#onWritePossible()} when the buffer has emptied. If
* this method returns <code>false</code> no further data must be written
* until the contain calls {@link WriteListener#onWritePossible()}.
*
* @return <code>true</code> if data can be written, else <code>false</code>
*
* @since Servlet 3.1
*/
public abstract boolean
isReady();
/**
* Sets the {@link WriteListener} for this {@link ServletOutputStream} and
* thereby switches to non-blocking IO. It is only valid to switch to
* non-blocking IO within async processing or HTTP upgrade processing.
*
* @param listener The non-blocking IO write listener
*
* @throws IllegalStateException If this method is called if neither
* async nor HTTP upgrade is in progress or
* if the {@link WriteListener} has already
* been set
* @throws NullPointerException If listener is null
*
* @since Servlet 3.1
*/
public abstract void
setWriteListener(javax.servlet.
WriteListener listener);
}