JDK 11 java.base.jmod - Base Module
JDK 11 java.base.jmod is the JMOD file for JDK 11 Base module.
JDK 11 Base module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\java.base.jmod.
JDK 11 Base module compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.
JDK 11 Base module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\java.base.
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⏎ java/io/Writer.java
/*
* Copyright (c) 1996, 2018, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.io;
import java.util.Objects;
/**
* Abstract class for writing to character streams. The only methods that a
* subclass must implement are write(char[], int, int), flush(), and close().
* Most subclasses, however, will override some of the methods defined here in
* order to provide higher efficiency, additional functionality, or both.
*
* @see BufferedWriter
* @see CharArrayWriter
* @see FilterWriter
* @see OutputStreamWriter
* @see FileWriter
* @see PipedWriter
* @see PrintWriter
* @see StringWriter
* @see Reader
*
* @author Mark Reinhold
* @since 1.1
*/
public abstract class Writer implements Appendable, Closeable, Flushable {
/**
* Temporary buffer used to hold writes of strings and single characters
*/
private char[] writeBuffer;
/**
* Size of writeBuffer, must be >= 1
*/
private static final int WRITE_BUFFER_SIZE = 1024;
/**
* Returns a new {@code Writer} which discards all characters. The
* returned stream is initially open. The stream is closed by calling
* the {@code close()} method. Subsequent calls to {@code close()} have
* no effect.
*
* <p> While the stream is open, the {@code append(char)}, {@code
* append(CharSequence)}, {@code append(CharSequence, int, int)},
* {@code flush()}, {@code write(int)}, {@code write(char[])}, and
* {@code write(char[], int, int)} methods do nothing. After the stream
* has been closed, these methods all throw {@code IOException}.
*
* <p> The {@link #lock object} used to synchronize operations on the
* returned {@code Writer} is not specified.
*
* @return a {@code Writer} which discards all characters
*
* @since 11
*/
public static Writer nullWriter() {
return new Writer() {
private volatile boolean closed;
private void ensureOpen() throws IOException {
if (closed) {
throw new IOException("Stream closed");
}
}
@Override
public Writer append(char c) throws IOException {
ensureOpen();
return this;
}
@Override
public Writer append(CharSequence csq) throws IOException {
ensureOpen();
return this;
}
@Override
public Writer append(CharSequence csq, int start, int end) throws IOException {
ensureOpen();
if (csq != null) {
Objects.checkFromToIndex(start, end, csq.length());
}
return this;
}
@Override
public void write(int c) throws IOException {
ensureOpen();
}
@Override
public void write(char[] cbuf, int off, int len) throws IOException {
Objects.checkFromIndexSize(off, len, cbuf.length);
ensureOpen();
}
@Override
public void write(String str) throws IOException {
Objects.requireNonNull(str);
ensureOpen();
}
@Override
public void write(String str, int off, int len) throws IOException {
Objects.checkFromIndexSize(off, len, str.length());
ensureOpen();
}
@Override
public void flush() throws IOException {
ensureOpen();
}
@Override
public void close() throws IOException {
closed = true;
}
};
}
/**
* The object used to synchronize operations on this stream. For
* efficiency, a character-stream object may use an object other than
* itself to protect critical sections. A subclass should therefore use
* the object in this field rather than {@code this} or a synchronized
* method.
*/
protected Object lock;
/**
* Creates a new character-stream writer whose critical sections will
* synchronize on the writer itself.
*/
protected Writer() {
this.lock = this;
}
/**
* Creates a new character-stream writer whose critical sections will
* synchronize on the given object.
*
* @param lock
* Object to synchronize on
*/
protected Writer(Object lock) {
if (lock == null) {
throw new NullPointerException();
}
this.lock = lock;
}
/**
* Writes a single character. The character to be written is contained in
* the 16 low-order bits of the given integer value; the 16 high-order bits
* are ignored.
*
* <p> Subclasses that intend to support efficient single-character output
* should override this method.
*
* @param c
* int specifying a character to be written
*
* @throws IOException
* If an I/O error occurs
*/
public void write(int c) throws IOException {
synchronized (lock) {
if (writeBuffer == null){
writeBuffer = new char[WRITE_BUFFER_SIZE];
}
writeBuffer[0] = (char) c;
write(writeBuffer, 0, 1);
}
}
/**
* Writes an array of characters.
*
* @param cbuf
* Array of characters to be written
*
* @throws IOException
* If an I/O error occurs
*/
public void write(char cbuf[]) throws IOException {
write(cbuf, 0, cbuf.length);
}
/**
* Writes a portion of an array of characters.
*
* @param cbuf
* Array of characters
*
* @param off
* Offset from which to start writing characters
*
* @param len
* Number of characters to write
*
* @throws IndexOutOfBoundsException
* Implementations should throw this exception
* if {@code off} is negative, or {@code len} is negative,
* or {@code off + len} is negative or greater than the length
* of the given array
*
* @throws IOException
* If an I/O error occurs
*/
public abstract void write(char cbuf[], int off, int len) throws IOException;
/**
* Writes a string.
*
* @param str
* String to be written
*
* @throws IOException
* If an I/O error occurs
*/
public void write(String str) throws IOException {
write(str, 0, str.length());
}
/**
* Writes a portion of a string.
*
* @implSpec
* The implementation in this class throws an
* {@code IndexOutOfBoundsException} for the indicated conditions;
* overriding methods may choose to do otherwise.
*
* @param str
* A String
*
* @param off
* Offset from which to start writing characters
*
* @param len
* Number of characters to write
*
* @throws IndexOutOfBoundsException
* Implementations should throw this exception
* if {@code off} is negative, or {@code len} is negative,
* or {@code off + len} is negative or greater than the length
* of the given string
*
* @throws IOException
* If an I/O error occurs
*/
public void write(String str, int off, int len) throws IOException {
synchronized (lock) {
char cbuf[];
if (len <= WRITE_BUFFER_SIZE) {
if (writeBuffer == null) {
writeBuffer = new char[WRITE_BUFFER_SIZE];
}
cbuf = writeBuffer;
} else { // Don't permanently allocate very large buffers.
cbuf = new char[len];
}
str.getChars(off, (off + len), cbuf, 0);
write(cbuf, 0, len);
}
}
/**
* Appends the specified character sequence to this writer.
*
* <p> An invocation of this method of the form {@code out.append(csq)}
* behaves in exactly the same way as the invocation
*
* <pre>
* out.write(csq.toString()) </pre>
*
* <p> Depending on the specification of {@code toString} for the
* character sequence {@code csq}, the entire sequence may not be
* appended. For instance, invoking the {@code toString} method of a
* character buffer will return a subsequence whose content depends upon
* the buffer's position and limit.
*
* @param csq
* The character sequence to append. If {@code csq} is
* {@code null}, then the four characters {@code "null"} are
* appended to this writer.
*
* @return This writer
*
* @throws IOException
* If an I/O error occurs
*
* @since 1.5
*/
public Writer append(CharSequence csq) throws IOException {
write(String.valueOf(csq));
return this;
}
/**
* Appends a subsequence of the specified character sequence to this writer.
* {@code Appendable}.
*
* <p> An invocation of this method of the form
* {@code out.append(csq, start, end)} when {@code csq}
* is not {@code null} behaves in exactly the
* same way as the invocation
*
* <pre>{@code
* out.write(csq.subSequence(start, end).toString())
* }</pre>
*
* @param csq
* The character sequence from which a subsequence will be
* appended. If {@code csq} is {@code null}, then characters
* will be appended as if {@code csq} contained the four
* characters {@code "null"}.
*
* @param start
* The index of the first character in the subsequence
*
* @param end
* The index of the character following the last character in the
* subsequence
*
* @return This writer
*
* @throws IndexOutOfBoundsException
* If {@code start} or {@code end} are negative, {@code start}
* is greater than {@code end}, or {@code end} is greater than
* {@code csq.length()}
*
* @throws IOException
* If an I/O error occurs
*
* @since 1.5
*/
public Writer append(CharSequence csq, int start, int end) throws IOException {
if (csq == null) csq = "null";
return append(csq.subSequence(start, end));
}
/**
* Appends the specified character to this writer.
*
* <p> An invocation of this method of the form {@code out.append(c)}
* behaves in exactly the same way as the invocation
*
* <pre>
* out.write(c) </pre>
*
* @param c
* The 16-bit character to append
*
* @return This writer
*
* @throws IOException
* If an I/O error occurs
*
* @since 1.5
*/
public Writer append(char c) throws IOException {
write(c);
return this;
}
/**
* Flushes 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.
*
* <p> If the intended destination of this stream is an abstraction provided
* by the underlying operating system, for example a file, then flushing the
* stream guarantees only that bytes previously written to the stream are
* passed to the operating system for writing; it does not guarantee that
* they are actually written to a physical device such as a disk drive.
*
* @throws IOException
* If an I/O error occurs
*/
public abstract void flush() throws IOException;
/**
* Closes the stream, flushing it first. Once the stream has been closed,
* further write() or flush() invocations will cause an IOException to be
* thrown. Closing a previously closed stream has no effect.
*
* @throws IOException
* If an I/O error occurs
*/
public abstract void close() throws IOException;
}
⏎ java/io/Writer.java
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