mirror of
https://github.com/moparisthebest/mailiverse
synced 2024-11-28 11:22:14 -05:00
241 lines
8.3 KiB
Java
241 lines
8.3 KiB
Java
/*
|
|
* 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 java.io;
|
|
|
|
/**
|
|
* Writer is an Abstract class for writing Character Streams. Subclasses of
|
|
* writer must implement the methods <code>write(char[], int, int)</code>,
|
|
* <code>close()</code> and <code>flush()</code>.
|
|
*
|
|
* @see Reader
|
|
*/
|
|
public abstract class Writer {
|
|
|
|
static final String TOKEN_NULL = "null"; //$NON-NLS-1$
|
|
|
|
/**
|
|
* The object used to synchronize access to the writer.
|
|
*/
|
|
protected Object lock;
|
|
|
|
/**
|
|
* Constructs a new character stream Writer using <code>this</code> as the
|
|
* Object to synchronize critical regions around.
|
|
*/
|
|
protected Writer() {
|
|
super();
|
|
lock = this;
|
|
}
|
|
|
|
/**
|
|
* Constructs a new character stream Writer using <code>lock</code> as the
|
|
* Object to synchronize critical regions around.
|
|
*
|
|
* @param lock
|
|
* the Object to synchronize critical regions around.
|
|
*/
|
|
protected Writer(Object lock) {
|
|
if (lock == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
this.lock = lock;
|
|
}
|
|
|
|
/**
|
|
* Close this Writer. This must be implemented by any concrete subclasses.
|
|
* The implementation should free any resources associated with the Writer.
|
|
*
|
|
* @throws IOException
|
|
* If an error occurs attempting to close this Writer.
|
|
*/
|
|
public abstract void close() throws IOException;
|
|
|
|
/**
|
|
* Flush this Writer. This must be implemented by any concrete subclasses.
|
|
* The implementation should ensure all buffered characters are written out.
|
|
*
|
|
* @throws IOException
|
|
* If an error occurs attempting to flush this Writer.
|
|
*/
|
|
public abstract void flush() throws IOException;
|
|
|
|
/**
|
|
* Writes the entire character buffer <code>buf</code> to this Writer.
|
|
*
|
|
* @param buf
|
|
* the non-null array containing characters to write.
|
|
*
|
|
* @throws IOException
|
|
* If this Writer has already been closed or some other
|
|
* IOException occurs.
|
|
*/
|
|
public void write(char buf[]) throws IOException {
|
|
write(buf, 0, buf.length);
|
|
}
|
|
|
|
/**
|
|
* Writes <code>count</code> characters starting at <code>offset<code> in
|
|
* <code>buf</code> to this Writer. This abstract method must be implemented
|
|
* by concrete subclasses.
|
|
*
|
|
* @param buf the non-null array containing characters to write.
|
|
* @param offset offset in buf to retrieve characters
|
|
* @param count maximum number of characters to write
|
|
*
|
|
* @throws IOException If this Writer has already been closed or some other IOException occurs.
|
|
* @throws ArrayIndexOutOfBoundsException If offset or count are outside of bounds.
|
|
*/
|
|
public abstract void write(char buf[], int offset, int count)
|
|
throws IOException;
|
|
|
|
/**
|
|
* Writes the specified character <code>oneChar</code> to this Writer.
|
|
* This implementation writes the low order two bytes of
|
|
* <code>oneChar</code> to the Stream.
|
|
*
|
|
* @param oneChar
|
|
* The character to write
|
|
*
|
|
* @throws IOException
|
|
* If this Writer has already been closed or some other
|
|
* IOException occurs.
|
|
*/
|
|
public void write(int oneChar) throws IOException {
|
|
synchronized (lock) {
|
|
char oneCharArray[] = new char[1];
|
|
oneCharArray[0] = (char) oneChar;
|
|
write(oneCharArray);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes the characters from the String <code>str</code> to this Writer.
|
|
*
|
|
* @param str
|
|
* the non-null String containing the characters to write.
|
|
*
|
|
* @throws IOException
|
|
* If this Writer has already been closed or some other
|
|
* IOException occurs.
|
|
*/
|
|
public void write(String str) throws IOException {
|
|
char buf[] = new char[str.length()];
|
|
str.getChars(0, buf.length, buf, 0);
|
|
synchronized (lock) {
|
|
write(buf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes <code>count</code> number of characters starting at
|
|
* <code>offset</code> from the String <code>str</code> to this Writer.
|
|
*
|
|
* @param str
|
|
* the non-null String containing the characters to write.
|
|
* @param offset
|
|
* the starting point to retrieve characters.
|
|
* @param count
|
|
* the number of characters to retrieve and write.
|
|
*
|
|
* @throws IOException
|
|
* If this Writer has already been closed or some other
|
|
* IOException occurs.
|
|
* @throws ArrayIndexOutOfBoundsException
|
|
* If offset or count are outside of bounds.
|
|
*/
|
|
public void write(String str, int offset, int count) throws IOException {
|
|
if (count < 0) { // other cases tested by getChars()
|
|
throw new StringIndexOutOfBoundsException();
|
|
}
|
|
char buf[] = new char[count];
|
|
str.getChars(offset, offset + count, buf, 0);
|
|
|
|
synchronized (lock) {
|
|
write(buf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Append a char <code>c</code>to the Writer. The Writer.append(<code>c</code>)
|
|
* works the same as Writer.write(<code>c</code>).
|
|
*
|
|
* @param c
|
|
* The character appended to the Writer.
|
|
* @return The Writer.
|
|
* @throws IOException
|
|
* If any IOException raises during the procedure.
|
|
*/
|
|
public Writer append(char c) throws IOException {
|
|
write(c);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Append a CharSequence <code>csq</code> to the Writer. The
|
|
* Writer.append(<code>csq</code>) works the same way as Writer.write(<code>csq</code>.toString()).
|
|
* If <code>csq</code> is null, then "null" will be substituted for
|
|
* <code>csq</code>.
|
|
*
|
|
* @param csq
|
|
* The CharSequence appended to the Writer.
|
|
* @return The Writer.
|
|
* @throws IOException
|
|
* If any IOException raises during the procedure.
|
|
*/
|
|
public Writer append(CharSequence csq) throws IOException {
|
|
if (null == csq) {
|
|
write(TOKEN_NULL);
|
|
} else {
|
|
write(csq.toString());
|
|
}
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Append a subsequence of a CharSequence <code>csq</code> to the Writer.
|
|
* The first char and the last char of the subsequnce is specified by the
|
|
* parameter <code>start</code> and <code>end</code>. The
|
|
* Writer.append(<code>csq</code>) works the same way as Writer.write (<code>csq</code>csq.subSequence(<code>start</code>,<code>end</code>).toString).
|
|
* If <code>csq</code> is null, then "null" will be substituted for
|
|
* <code>csq</code>.
|
|
*
|
|
* @param csq
|
|
* The CharSequence appended to the Writaer.
|
|
* @param start
|
|
* The index of the first char in the CharSequence appended to
|
|
* the Writer.
|
|
* @param end
|
|
* The index of the char after the last one in the CharSequence
|
|
* appended to the Writer.
|
|
* @return The Writer.
|
|
* @throws IndexOutOfBoundsException
|
|
* If start is less than end, end is greater than the length of
|
|
* the CharSequence, or start or end is negative.
|
|
* @throws IOException
|
|
* If any IOException raises during the procedure.
|
|
*/
|
|
public Writer append(CharSequence csq, int start, int end)
|
|
throws IOException {
|
|
if (null == csq) {
|
|
write(TOKEN_NULL.substring(start, end));
|
|
} else {
|
|
write(csq.subSequence(start, end).toString());
|
|
}
|
|
return this;
|
|
}
|
|
} |