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Appendable.java
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121 lines (115 loc) · 3.6 KB
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/*
* Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.lang;
import java.io.IOException;
/**
* An object to which <tt>char</tt> sequences and values can be appended. The
* <tt>Appendable</tt> interface must be implemented by any class whose
* instances are intended to receive formatted output from a {@link
* java.util.Formatter}.
*
* <p> The characters to be appended should be valid Unicode characters as
* described in <a href="Character.html#unicode">Unicode Character
* Representation</a>. Note that supplementary characters may be composed of
* multiple 16-bit <tt>char</tt> values.
*
* <p> Appendables are not necessarily safe for multithreaded access. Thread
* safety is the responsibility of classes that extend and implement this
* interface.
*
* <p> Since this interface may be implemented by existing classes
* with different styles of error handling there is no guarantee that
* errors will be propagated to the invoker.
*
* @since 1.5
*/
public interface Appendable {
/**
* Appends the specified character sequence to this <tt>Appendable</tt>.
*
* <p> Depending on which class implements the character sequence
* <tt>csq</tt>, the entire sequence may not be appended. For
* instance, if <tt>csq</tt> is a {@link java.nio.CharBuffer} then
* the subsequence to append is defined by the buffer's position and limit.
*
* @param csq
* The character sequence to append. If <tt>csq</tt> is
* <tt>null</tt>, then the four characters <tt>"null"</tt> are
* appended to this Appendable.
*
* @return A reference to this <tt>Appendable</tt>
*
* @throws IOException
* If an I/O error occurs
*/
Appendable append(CharSequence csq) throws IOException;
/**
* Appends a subsequence of the specified character sequence to this
* <tt>Appendable</tt>.
*
* <p> An invocation of this method of the form <tt>out.append(csq, start,
* end)</tt> when <tt>csq</tt> is not <tt>null</tt>, behaves in
* exactly the same way as the invocation
*
* <pre>
* out.append(csq.subSequence(start, end)) </pre>
*
* @param csq
* The character sequence from which a subsequence will be
* appended. If <tt>csq</tt> is <tt>null</tt>, then characters
* will be appended as if <tt>csq</tt> contained the four
* characters <tt>"null"</tt>.
*
* @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 A reference to this <tt>Appendable</tt>
*
* @throws IndexOutOfBoundsException
* If <tt>start</tt> or <tt>end</tt> are negative, <tt>start</tt>
* is greater than <tt>end</tt>, or <tt>end</tt> is greater than
* <tt>csq.length()</tt>
*
* @throws IOException
* If an I/O error occurs
*/
Appendable append(CharSequence csq, int start, int end) throws IOException;
/**
* Appends the specified character to this <tt>Appendable</tt>.
*
* @param c
* The character to append
*
* @return A reference to this <tt>Appendable</tt>
*
* @throws IOException
* If an I/O error occurs
*/
Appendable append(char c) throws IOException;
}