/*
 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

// -- This file was mechanically generated: Do not edit! -- //

package java.nio;


import java.io.IOException;


import java.util.Spliterator;
import java.util.stream.StreamSupport;
import java.util.stream.IntStream;


/**
 * A char buffer.
 *
 * <p> This class defines four categories of operations upon
 * char buffers:
 *
 * <ul>
 *
 * <li><p> Absolute and relative {@link #get() <i>get</i>} and
 * {@link #put(char) <i>put</i>} methods that read and write
 * single chars; </p></li>
 *
 * <li><p> Relative {@link #get(char[]) <i>bulk get</i>}
 * methods that transfer contiguous sequences of chars from this buffer
 * into an array; and</p></li>
 *
 * <li><p> Relative {@link #put(char[]) <i>bulk put</i>}
 * methods that transfer contiguous sequences of chars from a
 * char array,&#32;a&#32;string, or some other char
 * buffer into this buffer;&#32;and </p></li>
 *












 *
 * <li><p> Methods for {@link #compact compacting}, {@link
 * #duplicate duplicating}, and {@link #slice slicing}
 * a char buffer. </p></li>
 *
 * </ul>
 *
 * <p> Char buffers can be created either by {@link #allocate
 * <i>allocation</i>}, which allocates space for the buffer's
 *






 *
 * content, by {@link #wrap(char[]) <i>wrapping</i>} an existing
 * char array or&#32;string into a buffer, or by creating a
 * <a href="ByteBuffer.html#views"><i>view</i></a> of an existing byte buffer.
 *

 *



































































































*

 *
 * <p> Like a byte buffer, a char buffer is either <a
 * href="ByteBuffer.html#direct"><i>direct</i> or <i>non-direct</i></a>. A
 * char buffer created via the <tt>wrap</tt> methods of this class will
 * be non-direct. A char buffer created as a view of a byte buffer will
 * be direct if, and only if, the byte buffer itself is direct. Whether or not
 * a char buffer is direct may be determined by invoking the {@link
 * #isDirect isDirect} method. </p>
 *

*

 *
 * <p> This class implements the {@link CharSequence} interface so that
 * character buffers may be used wherever character sequences are accepted, for
 * example in the regular-expression package <tt>{@link java.util.regex}</tt>.
 * </p>
 *

 *



 *
 * <p> Methods in this class that do not otherwise have a value to return are
 * specified to return the buffer upon which they are invoked. This allows
 * method invocations to be chained.
 *
















 *
 * The sequence of statements
 *
 * <blockquote><pre>
 * cb.put("text/");
 * cb.put(subtype);
 * cb.put("; charset=");
 * cb.put(enc);</pre></blockquote>
 *
 * can, for example, be replaced by the single statement
 *
 * <blockquote><pre>
 * cb.put("text/").put(subtype).put("; charset=").put(enc);</pre></blockquote>
 *

 *
 *
 * @author Mark Reinhold
 * @author JSR-51 Expert Group
 * @since 1.4
 */

public abstract class CharBuffer
 extends Buffer
 implements Comparable<CharBuffer>, Appendable, CharSequence, Readable
{

 // These fields are declared here rather than in Heap-X-Buffer in order to
 // reduce the number of virtual method invocations needed to access these
 // values, which is especially costly when coding small buffers.
 //
 final char[] hb; // Non-null only for heap buffers
 final int offset;
 boolean isReadOnly; // Valid only for heap buffers

 // Creates a new buffer with the given mark, position, limit, capacity,
 // backing array, and array offset
 //
 CharBuffer(int mark, int pos, int lim, int cap, // package-private
 char[] hb, int offset)
 {
 super(mark, pos, lim, cap);
 this.hb = hb;
 this.offset = offset;
 }

 // Creates a new buffer with the given mark, position, limit, and capacity
 //
 CharBuffer(int mark, int pos, int lim, int cap) { // package-private
 this(mark, pos, lim, cap, null, 0);
 }

























 /**
 * Allocates a new char buffer.
 *
 * <p> The new buffer's position will be zero, its limit will be its
 * capacity, its mark will be undefined, and each of its elements will be
 * initialized to zero. It will have a {@link #array backing array},
 * and its {@link #arrayOffset array offset} will be zero.
 *
 * @param capacity
 * The new buffer's capacity, in chars
 *
 * @return The new char buffer
 *
 * @throws IllegalArgumentException
 * If the <tt>capacity</tt> is a negative integer
 */
 public static CharBuffer allocate(int capacity) {
 if (capacity < 0)
 throw new IllegalArgumentException();
 return new HeapCharBuffer(capacity, capacity);
 }

 /**
 * Wraps a char array into a buffer.
 *
 * <p> The new buffer will be backed by the given char array;
 * that is, modifications to the buffer will cause the array to be modified
 * and vice versa. The new buffer's capacity will be
 * <tt>array.length</tt>, its position will be <tt>offset</tt>, its limit
 * will be <tt>offset + length</tt>, and its mark will be undefined. Its
 * {@link #array backing array} will be the given array, and
 * its {@link #arrayOffset array offset} will be zero. </p>
 *
 * @param array
 * The array that will back the new buffer
 *
 * @param offset
 * The offset of the subarray to be used; must be non-negative and
 * no larger than <tt>array.length</tt>. The new buffer's position
 * will be set to this value.
 *
 * @param length
 * The length of the subarray to be used;
 * must be non-negative and no larger than
 * <tt>array.length - offset</tt>.
 * The new buffer's limit will be set to <tt>offset + length</tt>.
 *
 * @return The new char buffer
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on the <tt>offset</tt> and <tt>length</tt>
 * parameters do not hold
 */
 public static CharBuffer wrap(char[] array,
 int offset, int length)
 {
 try {
 return new HeapCharBuffer(array, offset, length);
 } catch (IllegalArgumentException x) {
 throw new IndexOutOfBoundsException();
 }
 }

 /**
 * Wraps a char array into a buffer.
 *
 * <p> The new buffer will be backed by the given char array;
 * that is, modifications to the buffer will cause the array to be modified
 * and vice versa. The new buffer's capacity and limit will be
 * <tt>array.length</tt>, its position will be zero, and its mark will be
 * undefined. Its {@link #array backing array} will be the
 * given array, and its {@link #arrayOffset array offset>} will
 * be zero. </p>
 *
 * @param array
 * The array that will back this buffer
 *
 * @return The new char buffer
 */
 public static CharBuffer wrap(char[] array) {
 return wrap(array, 0, array.length);
 }



 /**
 * Attempts to read characters into the specified character buffer.
 * The buffer is used as a repository of characters as-is: the only
 * changes made are the results of a put operation. No flipping or
 * rewinding of the buffer is performed.
 *
 * @param target the buffer to read characters into
 * @return The number of characters added to the buffer, or
 * -1 if this source of characters is at its end
 * @throws IOException if an I/O error occurs
 * @throws NullPointerException if target is null
 * @throws ReadOnlyBufferException if target is a read only buffer
 * @since 1.5
 */
 public int read(CharBuffer target) throws IOException {
 // Determine the number of bytes n that can be transferred
 int targetRemaining = target.remaining();
 int remaining = remaining();
 if (remaining == 0)
 return -1;
 int n = Math.min(remaining, targetRemaining);
 int limit = limit();
 // Set source limit to prevent target overflow
 if (targetRemaining < remaining)
 limit(position() + n);
 try {
 if (n > 0)
 target.put(this);
 } finally {
 limit(limit); // restore real limit
 }
 return n;
 }

 /**
 * Wraps a character sequence into a buffer.
 *
 * <p> The content of the new, read-only buffer will be the content of the
 * given character sequence. The buffer's capacity will be
 * <tt>csq.length()</tt>, its position will be <tt>start</tt>, its limit
 * will be <tt>end</tt>, and its mark will be undefined. </p>
 *
 * @param csq
 * The character sequence from which the new character buffer is to
 * be created
 *
 * @param start
 * The index of the first character to be used;
 * must be non-negative and no larger than <tt>csq.length()</tt>.
 * The new buffer's position will be set to this value.
 *
 * @param end
 * The index of the character following the last character to be
 * used; must be no smaller than <tt>start</tt> and no larger
 * than <tt>csq.length()</tt>.
 * The new buffer's limit will be set to this value.
 *
 * @return The new character buffer
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on the <tt>start</tt> and <tt>end</tt>
 * parameters do not hold
 */
 public static CharBuffer wrap(CharSequence csq, int start, int end) {
 try {
 return new StringCharBuffer(csq, start, end);
 } catch (IllegalArgumentException x) {
 throw new IndexOutOfBoundsException();
 }
 }

 /**
 * Wraps a character sequence into a buffer.
 *
 * <p> The content of the new, read-only buffer will be the content of the
 * given character sequence. The new buffer's capacity and limit will be
 * <tt>csq.length()</tt>, its position will be zero, and its mark will be
 * undefined. </p>
 *
 * @param csq
 * The character sequence from which the new character buffer is to
 * be created
 *
 * @return The new character buffer
 */
 public static CharBuffer wrap(CharSequence csq) {
 return wrap(csq, 0, csq.length());
 }



 /**
 * Creates a new char buffer whose content is a shared subsequence of
 * this buffer's content.
 *
 * <p> The content of the new buffer will start at this buffer's current
 * position. Changes to this buffer's content will be visible in the new
 * buffer, and vice versa; the two buffers' position, limit, and mark
 * values will be independent.
 *
 * <p> The new buffer's position will be zero, its capacity and its limit
 * will be the number of chars remaining in this buffer, and its mark
 * will be undefined. The new buffer will be direct if, and only if, this
 * buffer is direct, and it will be read-only if, and only if, this buffer
 * is read-only. </p>
 *
 * @return The new char buffer
 */
 public abstract CharBuffer slice();

 /**
 * Creates a new char buffer that shares this buffer's content.
 *
 * <p> The content of the new buffer will be that of this buffer. Changes
 * to this buffer's content will be visible in the new buffer, and vice
 * versa; the two buffers' position, limit, and mark values will be
 * independent.
 *
 * <p> The new buffer's capacity, limit, position, and mark values will be
 * identical to those of this buffer. The new buffer will be direct if,
 * and only if, this buffer is direct, and it will be read-only if, and
 * only if, this buffer is read-only. </p>
 *
 * @return The new char buffer
 */
 public abstract CharBuffer duplicate();

 /**
 * Creates a new, read-only char buffer that shares this buffer's
 * content.
 *
 * <p> The content of the new buffer will be that of this buffer. Changes
 * to this buffer's content will be visible in the new buffer; the new
 * buffer itself, however, will be read-only and will not allow the shared
 * content to be modified. The two buffers' position, limit, and mark
 * values will be independent.
 *
 * <p> The new buffer's capacity, limit, position, and mark values will be
 * identical to those of this buffer.
 *
 * <p> If this buffer is itself read-only then this method behaves in
 * exactly the same way as the {@link #duplicate duplicate} method. </p>
 *
 * @return The new, read-only char buffer
 */
 public abstract CharBuffer asReadOnlyBuffer();


 // -- Singleton get/put methods --

 /**
 * Relative <i>get</i> method. Reads the char at this buffer's
 * current position, and then increments the position.
 *
 * @return The char at the buffer's current position
 *
 * @throws BufferUnderflowException
 * If the buffer's current position is not smaller than its limit
 */
 public abstract char get();

 /**
 * Relative <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> Writes the given char into this buffer at the current
 * position, and then increments the position. </p>
 *
 * @param c
 * The char to be written
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If this buffer's current position is not smaller than its limit
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public abstract CharBuffer put(char c);

 /**
 * Absolute <i>get</i> method. Reads the char at the given
 * index.
 *
 * @param index
 * The index from which the char will be read
 *
 * @return The char at the given index
 *
 * @throws IndexOutOfBoundsException
 * If <tt>index</tt> is negative
 * or not smaller than the buffer's limit
 */
 public abstract char get(int index);


 /**
 * Absolute <i>get</i> method. Reads the char at the given
 * index without any validation of the index.
 *
 * @param index
 * The index from which the char will be read
 *
 * @return The char at the given index
 */
 abstract char getUnchecked(int index); // package-private


 /**
 * Absolute <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> Writes the given char into this buffer at the given
 * index. </p>
 *
 * @param index
 * The index at which the char will be written
 *
 * @param c
 * The char value to be written
 *
 * @return This buffer
 *
 * @throws IndexOutOfBoundsException
 * If <tt>index</tt> is negative
 * or not smaller than the buffer's limit
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public abstract CharBuffer put(int index, char c);


 // -- Bulk get operations --

 /**
 * Relative bulk <i>get</i> method.
 *
 * <p> This method transfers chars from this buffer into the given
 * destination array. If there are fewer chars remaining in the
 * buffer than are required to satisfy the request, that is, if
 * <tt>length</tt>&nbsp;<tt>&gt;</tt>&nbsp;<tt>remaining()</tt>, then no
 * chars are transferred and a {@link BufferUnderflowException} is
 * thrown.
 *
 * <p> Otherwise, this method copies <tt>length</tt> chars from this
 * buffer into the given array, starting at the current position of this
 * buffer and at the given offset in the array. The position of this
 * buffer is then incremented by <tt>length</tt>.
 *
 * <p> In other words, an invocation of this method of the form
 * <tt>src.get(dst,&nbsp;off,&nbsp;len)</tt> has exactly the same effect as
 * the loop
 *
 * <pre>{@code
 * for (int i = off; i < off + len; i++)
 * dst[i] = src.get():
 * }</pre>
 *
 * except that it first checks that there are sufficient chars in
 * this buffer and it is potentially much more efficient.
 *
 * @param dst
 * The array into which chars are to be written
 *
 * @param offset
 * The offset within the array of the first char to be
 * written; must be non-negative and no larger than
 * <tt>dst.length</tt>
 *
 * @param length
 * The maximum number of chars to be written to the given
 * array; must be non-negative and no larger than
 * <tt>dst.length - offset</tt>
 *
 * @return This buffer
 *
 * @throws BufferUnderflowException
 * If there are fewer than <tt>length</tt> chars
 * remaining in this buffer
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on the <tt>offset</tt> and <tt>length</tt>
 * parameters do not hold
 */
 public CharBuffer get(char[] dst, int offset, int length) {
 checkBounds(offset, length, dst.length);
 if (length > remaining())
 throw new BufferUnderflowException();
 int end = offset + length;
 for (int i = offset; i < end; i++)
 dst[i] = get();
 return this;
 }

 /**
 * Relative bulk <i>get</i> method.
 *
 * <p> This method transfers chars from this buffer into the given
 * destination array. An invocation of this method of the form
 * <tt>src.get(a)</tt> behaves in exactly the same way as the invocation
 *
 * <pre>
 * src.get(a, 0, a.length) </pre>
 *
 * @param dst
 * The destination array
 *
 * @return This buffer
 *
 * @throws BufferUnderflowException
 * If there are fewer than <tt>length</tt> chars
 * remaining in this buffer
 */
 public CharBuffer get(char[] dst) {
 return get(dst, 0, dst.length);
 }


 // -- Bulk put operations --

 /**
 * Relative bulk <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> This method transfers the chars remaining in the given source
 * buffer into this buffer. If there are more chars remaining in the
 * source buffer than in this buffer, that is, if
 * <tt>src.remaining()</tt>&nbsp;<tt>&gt;</tt>&nbsp;<tt>remaining()</tt>,
 * then no chars are transferred and a {@link
 * BufferOverflowException} is thrown.
 *
 * <p> Otherwise, this method copies
 * <i>n</i>&nbsp;=&nbsp;<tt>src.remaining()</tt> chars from the given
 * buffer into this buffer, starting at each buffer's current position.
 * The positions of both buffers are then incremented by <i>n</i>.
 *
 * <p> In other words, an invocation of this method of the form
 * <tt>dst.put(src)</tt> has exactly the same effect as the loop
 *
 * <pre>
 * while (src.hasRemaining())
 * dst.put(src.get()); </pre>
 *
 * except that it first checks that there is sufficient space in this
 * buffer and it is potentially much more efficient.
 *
 * @param src
 * The source buffer from which chars are to be read;
 * must not be this buffer
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 * for the remaining chars in the source buffer
 *
 * @throws IllegalArgumentException
 * If the source buffer is this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public CharBuffer put(CharBuffer src) {
 if (src == this)
 throw new IllegalArgumentException();
 if (isReadOnly())
 throw new ReadOnlyBufferException();
 int n = src.remaining();
 if (n > remaining())
 throw new BufferOverflowException();
 for (int i = 0; i < n; i++)
 put(src.get());
 return this;
 }

 /**
 * Relative bulk <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> This method transfers chars into this buffer from the given
 * source array. If there are more chars to be copied from the array
 * than remain in this buffer, that is, if
 * <tt>length</tt>&nbsp;<tt>&gt;</tt>&nbsp;<tt>remaining()</tt>, then no
 * chars are transferred and a {@link BufferOverflowException} is
 * thrown.
 *
 * <p> Otherwise, this method copies <tt>length</tt> chars from the
 * given array into this buffer, starting at the given offset in the array
 * and at the current position of this buffer. The position of this buffer
 * is then incremented by <tt>length</tt>.
 *
 * <p> In other words, an invocation of this method of the form
 * <tt>dst.put(src,&nbsp;off,&nbsp;len)</tt> has exactly the same effect as
 * the loop
 *
 * <pre>{@code
 * for (int i = off; i < off + len; i++)
 * dst.put(a[i]);
 * }</pre>
 *
 * except that it first checks that there is sufficient space in this
 * buffer and it is potentially much more efficient.
 *
 * @param src
 * The array from which chars are to be read
 *
 * @param offset
 * The offset within the array of the first char to be read;
 * must be non-negative and no larger than <tt>array.length</tt>
 *
 * @param length
 * The number of chars to be read from the given array;
 * must be non-negative and no larger than
 * <tt>array.length - offset</tt>
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on the <tt>offset</tt> and <tt>length</tt>
 * parameters do not hold
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public CharBuffer put(char[] src, int offset, int length) {
 checkBounds(offset, length, src.length);
 if (length > remaining())
 throw new BufferOverflowException();
 int end = offset + length;
 for (int i = offset; i < end; i++)
 this.put(src[i]);
 return this;
 }

 /**
 * Relative bulk <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> This method transfers the entire content of the given source
 * char array into this buffer. An invocation of this method of the
 * form <tt>dst.put(a)</tt> behaves in exactly the same way as the
 * invocation
 *
 * <pre>
 * dst.put(a, 0, a.length) </pre>
 *
 * @param src
 * The source array
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public final CharBuffer put(char[] src) {
 return put(src, 0, src.length);
 }



 /**
 * Relative bulk <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> This method transfers chars from the given string into this
 * buffer. If there are more chars to be copied from the string than
 * remain in this buffer, that is, if
 * <tt>end&nbsp;-&nbsp;start</tt>&nbsp;<tt>&gt;</tt>&nbsp;<tt>remaining()</tt>,
 * then no chars are transferred and a {@link
 * BufferOverflowException} is thrown.
 *
 * <p> Otherwise, this method copies
 * <i>n</i>&nbsp;=&nbsp;<tt>end</tt>&nbsp;-&nbsp;<tt>start</tt> chars
 * from the given string into this buffer, starting at the given
 * <tt>start</tt> index and at the current position of this buffer. The
 * position of this buffer is then incremented by <i>n</i>.
 *
 * <p> In other words, an invocation of this method of the form
 * <tt>dst.put(src,&nbsp;start,&nbsp;end)</tt> has exactly the same effect
 * as the loop
 *
 * <pre>{@code
 * for (int i = start; i < end; i++)
 * dst.put(src.charAt(i));
 * }</pre>
 *
 * except that it first checks that there is sufficient space in this
 * buffer and it is potentially much more efficient.
 *
 * @param src
 * The string from which chars are to be read
 *
 * @param start
 * The offset within the string of the first char to be read;
 * must be non-negative and no larger than
 * <tt>string.length()</tt>
 *
 * @param end
 * The offset within the string of the last char to be read,
 * plus one; must be non-negative and no larger than
 * <tt>string.length()</tt>
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on the <tt>start</tt> and <tt>end</tt>
 * parameters do not hold
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public CharBuffer put(String src, int start, int end) {
 checkBounds(start, end - start, src.length());
 if (isReadOnly())
 throw new ReadOnlyBufferException();
 if (end - start > remaining())
 throw new BufferOverflowException();
 for (int i = start; i < end; i++)
 this.put(src.charAt(i));
 return this;
 }

 /**
 * Relative bulk <i>put</i> method&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> This method transfers the entire content of the given source string
 * into this buffer. An invocation of this method of the form
 * <tt>dst.put(s)</tt> behaves in exactly the same way as the invocation
 *
 * <pre>
 * dst.put(s, 0, s.length()) </pre>
 *
 * @param src
 * The source string
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public final CharBuffer put(String src) {
 return put(src, 0, src.length());
 }




 // -- Other stuff --

 /**
 * Tells whether or not this buffer is backed by an accessible char
 * array.
 *
 * <p> If this method returns <tt>true</tt> then the {@link #array() array}
 * and {@link #arrayOffset() arrayOffset} methods may safely be invoked.
 * </p>
 *
 * @return <tt>true</tt> if, and only if, this buffer
 * is backed by an array and is not read-only
 */
 public final boolean hasArray() {
 return (hb != null) && !isReadOnly;
 }

 /**
 * Returns the char array that backs this
 * buffer&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> Modifications to this buffer's content will cause the returned
 * array's content to be modified, and vice versa.
 *
 * <p> Invoke the {@link #hasArray hasArray} method before invoking this
 * method in order to ensure that this buffer has an accessible backing
 * array. </p>
 *
 * @return The array that backs this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is backed by an array but is read-only
 *
 * @throws UnsupportedOperationException
 * If this buffer is not backed by an accessible array
 */
 public final char[] array() {
 if (hb == null)
 throw new UnsupportedOperationException();
 if (isReadOnly)
 throw new ReadOnlyBufferException();
 return hb;
 }

 /**
 * Returns the offset within this buffer's backing array of the first
 * element of the buffer&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> If this buffer is backed by an array then buffer position <i>p</i>
 * corresponds to array index <i>p</i>&nbsp;+&nbsp;<tt>arrayOffset()</tt>.
 *
 * <p> Invoke the {@link #hasArray hasArray} method before invoking this
 * method in order to ensure that this buffer has an accessible backing
 * array. </p>
 *
 * @return The offset within this buffer's array
 * of the first element of the buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is backed by an array but is read-only
 *
 * @throws UnsupportedOperationException
 * If this buffer is not backed by an accessible array
 */
 public final int arrayOffset() {
 if (hb == null)
 throw new UnsupportedOperationException();
 if (isReadOnly)
 throw new ReadOnlyBufferException();
 return offset;
 }

 /**
 * Compacts this buffer&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> The chars between the buffer's current position and its limit,
 * if any, are copied to the beginning of the buffer. That is, the
 * char at index <i>p</i>&nbsp;=&nbsp;<tt>position()</tt> is copied
 * to index zero, the char at index <i>p</i>&nbsp;+&nbsp;1 is copied
 * to index one, and so forth until the char at index
 * <tt>limit()</tt>&nbsp;-&nbsp;1 is copied to index
 * <i>n</i>&nbsp;=&nbsp;<tt>limit()</tt>&nbsp;-&nbsp;<tt>1</tt>&nbsp;-&nbsp;<i>p</i>.
 * The buffer's position is then set to <i>n+1</i> and its limit is set to
 * its capacity. The mark, if defined, is discarded.
 *
 * <p> The buffer's position is set to the number of chars copied,
 * rather than to zero, so that an invocation of this method can be
 * followed immediately by an invocation of another relative <i>put</i>
 * method. </p>
 *
















 *
 * @return This buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 */
 public abstract CharBuffer compact();

 /**
 * Tells whether or not this char buffer is direct.
 *
 * @return <tt>true</tt> if, and only if, this buffer is direct
 */
 public abstract boolean isDirect();


























 /**
 * Returns the current hash code of this buffer.
 *
 * <p> The hash code of a char buffer depends only upon its remaining
 * elements; that is, upon the elements from <tt>position()</tt> up to, and
 * including, the element at <tt>limit()</tt>&nbsp;-&nbsp;<tt>1</tt>.
 *
 * <p> Because buffer hash codes are content-dependent, it is inadvisable
 * to use buffers as keys in hash maps or similar data structures unless it
 * is known that their contents will not change. </p>
 *
 * @return The current hash code of this buffer
 */
 public int hashCode() {
 int h = 1;
 int p = position();
 for (int i = limit() - 1; i >= p; i--)



 h = 31 * h + (int)get(i);

 return h;
 }

 /**
 * Tells whether or not this buffer is equal to another object.
 *
 * <p> Two char buffers are equal if, and only if,
 *
 * <ol>
 *
 * <li><p> They have the same element type, </p></li>
 *
 * <li><p> They have the same number of remaining elements, and
 * </p></li>
 *
 * <li><p> The two sequences of remaining elements, considered
 * independently of their starting positions, are pointwise equal.







 * </p></li>
 *
 * </ol>
 *
 * <p> A char buffer is not equal to any other type of object. </p>
 *
 * @param ob The object to which this buffer is to be compared
 *
 * @return <tt>true</tt> if, and only if, this buffer is equal to the
 * given object
 */
 public boolean equals(Object ob) {
 if (this == ob)
 return true;
 if (!(ob instanceof CharBuffer))
 return false;
 CharBuffer that = (CharBuffer)ob;
 if (this.remaining() != that.remaining())
 return false;
 int p = this.position();
 for (int i = this.limit() - 1, j = that.limit() - 1; i >= p; i--, j--)
 if (!equals(this.get(i), that.get(j)))
 return false;
 return true;
 }

 private static boolean equals(char x, char y) {



 return x == y;

 }

 /**
 * Compares this buffer to another.
 *
 * <p> Two char buffers are compared by comparing their sequences of
 * remaining elements lexicographically, without regard to the starting
 * position of each sequence within its corresponding buffer.








 * Pairs of {@code char} elements are compared as if by invoking
 * {@link Character#compare(char,char)}.

 *
 * <p> A char buffer is not comparable to any other type of object.
 *
 * @return A negative integer, zero, or a positive integer as this buffer
 * is less than, equal to, or greater than the given buffer
 */
 public int compareTo(CharBuffer that) {
 int n = this.position() + Math.min(this.remaining(), that.remaining());
 for (int i = this.position(), j = that.position(); i < n; i++, j++) {
 int cmp = compare(this.get(i), that.get(j));
 if (cmp != 0)
 return cmp;
 }
 return this.remaining() - that.remaining();
 }

 private static int compare(char x, char y) {






 return Character.compare(x, y);

 }

 // -- Other char stuff --



 /**
 * Returns a string containing the characters in this buffer.
 *
 * <p> The first character of the resulting string will be the character at
 * this buffer's position, while the last character will be the character
 * at index <tt>limit()</tt>&nbsp;-&nbsp;1. Invoking this method does not
 * change the buffer's position. </p>
 *
 * @return The specified string
 */
 public String toString() {
 return toString(position(), limit());
 }

 abstract String toString(int start, int end); // package-private


 // --- Methods to support CharSequence ---

 /**
 * Returns the length of this character buffer.
 *
 * <p> When viewed as a character sequence, the length of a character
 * buffer is simply the number of characters between the position
 * (inclusive) and the limit (exclusive); that is, it is equivalent to
 * <tt>remaining()</tt>. </p>
 *
 * @return The length of this character buffer
 */
 public final int length() {
 return remaining();
 }

 /**
 * Reads the character at the given index relative to the current
 * position.
 *
 * @param index
 * The index of the character to be read, relative to the position;
 * must be non-negative and smaller than <tt>remaining()</tt>
 *
 * @return The character at index
 * <tt>position()&nbsp;+&nbsp;index</tt>
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on <tt>index</tt> do not hold
 */
 public final char charAt(int index) {
 return get(position() + checkIndex(index, 1));
 }

 /**
 * Creates a new character buffer that represents the specified subsequence
 * of this buffer, relative to the current position.
 *
 * <p> The new buffer will share this buffer's content; that is, if the
 * content of this buffer is mutable then modifications to one buffer will
 * cause the other to be modified. The new buffer's capacity will be that
 * of this buffer, its position will be
 * <tt>position()</tt>&nbsp;+&nbsp;<tt>start</tt>, and its limit will be
 * <tt>position()</tt>&nbsp;+&nbsp;<tt>end</tt>. The new buffer will be
 * direct if, and only if, this buffer is direct, and it will be read-only
 * if, and only if, this buffer is read-only. </p>
 *
 * @param start
 * The index, relative to the current position, of the first
 * character in the subsequence; must be non-negative and no larger
 * than <tt>remaining()</tt>
 *
 * @param end
 * The index, relative to the current position, of the character
 * following the last character in the subsequence; must be no
 * smaller than <tt>start</tt> and no larger than
 * <tt>remaining()</tt>
 *
 * @return The new character buffer
 *
 * @throws IndexOutOfBoundsException
 * If the preconditions on <tt>start</tt> and <tt>end</tt>
 * do not hold
 */
 public abstract CharBuffer subSequence(int start, int end);


 // --- Methods to support Appendable ---

 /**
 * Appends the specified character sequence to this
 * buffer&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> An invocation of this method of the form <tt>dst.append(csq)</tt>
 * behaves in exactly the same way as the invocation
 *
 * <pre>
 * dst.put(csq.toString()) </pre>
 *
 * <p> Depending on the specification of <tt>toString</tt> for the
 * character sequence <tt>csq</tt>, the entire sequence may not be
 * appended. For instance, invoking the {@link CharBuffer#toString()
 * 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 <tt>csq</tt> is
 * <tt>null</tt>, then the four characters <tt>"null"</tt> are
 * appended to this character buffer.
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 *
 * @since 1.5
 */
 public CharBuffer append(CharSequence csq) {
 if (csq == null)
 return put("null");
 else
 return put(csq.toString());
 }

 /**
 * Appends a subsequence of the specified character sequence to this
 * buffer&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> An invocation of this method of the form <tt>dst.append(csq, start,
 * end)</tt> when <tt>csq</tt> is not <tt>null</tt>, behaves in exactly the
 * same way as the invocation
 *
 * <pre>
 * dst.put(csq.subSequence(start, end).toString()) </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>.
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @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 ReadOnlyBufferException
 * If this buffer is read-only
 *
 * @since 1.5
 */
 public CharBuffer append(CharSequence csq, int start, int end) {
 CharSequence cs = (csq == null ? "null" : csq);
 return put(cs.subSequence(start, end).toString());
 }

 /**
 * Appends the specified char to this
 * buffer&nbsp;&nbsp;<i>(optional operation)</i>.
 *
 * <p> An invocation of this method of the form <tt>dst.append(c)</tt>
 * behaves in exactly the same way as the invocation
 *
 * <pre>
 * dst.put(c) </pre>
 *
 * @param c
 * The 16-bit char to append
 *
 * @return This buffer
 *
 * @throws BufferOverflowException
 * If there is insufficient space in this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is read-only
 *
 * @since 1.5
 */
 public CharBuffer append(char c) {
 return put(c);
 }




 // -- Other byte stuff: Access to binary data --



 /**
 * Retrieves this buffer's byte order.
 *
 * <p> The byte order of a char buffer created by allocation or by
 * wrapping an existing <tt>char</tt> array is the {@link
 * ByteOrder#nativeOrder native order} of the underlying
 * hardware. The byte order of a char buffer created as a <a
 * href="ByteBuffer.html#views">view</a> of a byte buffer is that of the
 * byte buffer at the moment that the view is created. </p>
 *
 * @return This buffer's byte order
 */
 public abstract ByteOrder order();
























































 @Override

 public IntStream chars() {
 return StreamSupport.intStream(() -> new CharBufferSpliterator(this),
 Buffer.SPLITERATOR_CHARACTERISTICS, false);
 }



}