| /* |
| * 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.nio; |
| |
| import java.io.IOException; |
| |
| /** |
| * A buffer of chars. |
| * <p> |
| * A char buffer can be created in either one of the following ways: |
| * <ul> |
| * <li>{@link #allocate(int) Allocate} a new char array and create a buffer |
| * based on it;</li> |
| * <li>{@link #wrap(char[]) Wrap} an existing char array to create a new |
| * buffer;</li> |
| * <li>{@link #wrap(CharSequence) Wrap} an existing char sequence to create a |
| * new buffer;</li> |
| * <li>Use {@link java.nio.ByteBuffer#asCharBuffer() ByteBuffer.asCharBuffer} |
| * to create a char buffer based on a byte buffer.</li> |
| * </ul> |
| */ |
| public abstract class CharBuffer extends Buffer implements |
| Comparable<CharBuffer>, CharSequence, Appendable, Readable { |
| |
| /** |
| * Creates a char buffer based on a newly allocated char array. |
| * |
| * @param capacity |
| * the capacity of the new buffer. |
| * @return the created char buffer. |
| * @throws IllegalArgumentException |
| * if {@code capacity} is less than zero. |
| */ |
| public static CharBuffer allocate(int capacity) { |
| if (capacity < 0) { |
| throw new IllegalArgumentException(); |
| } |
| return BufferFactory.newCharBuffer(capacity); |
| } |
| |
| /** |
| * Creates a new char buffer by wrapping the given char array. |
| * <p> |
| * Calling this method has the same effect as |
| * {@code wrap(array, 0, array.length)}. |
| * |
| * @param array |
| * the char array which the new buffer will be based on. |
| * @return the created char buffer. |
| */ |
| public static CharBuffer wrap(char[] array) { |
| return wrap(array, 0, array.length); |
| } |
| |
| /** |
| * Creates a new char buffer by wrapping the given char array. |
| * <p> |
| * The new buffer's position will be {@code start}, limit will be |
| * {@code start + len}, capacity will be the length of the array. |
| * |
| * @param array |
| * the char array which the new buffer will be based on. |
| * @param start |
| * the start index, must not be negative and not greater than |
| * {@code array.length}. |
| * @param len |
| * the length, must not be negative and not greater than |
| * {@code array.length - start}. |
| * @return the created char buffer. |
| * @exception IndexOutOfBoundsException |
| * if either {@code start} or {@code len} is invalid. |
| */ |
| public static CharBuffer wrap(char[] array, int start, int len) { |
| int length = array.length; |
| if ((start < 0) || (len < 0) || (long) start + (long) len > length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| CharBuffer buf = BufferFactory.newCharBuffer(array); |
| buf.position = start; |
| buf.limit = start + len; |
| |
| return buf; |
| } |
| |
| /** |
| * Creates a new char buffer by wrapping the given char sequence. |
| * <p> |
| * Calling this method has the same effect as |
| * {@code wrap(chseq, 0, chseq.length())}. |
| * |
| * @param chseq |
| * the char sequence which the new buffer will be based on. |
| * @return the created char buffer. |
| */ |
| public static CharBuffer wrap(CharSequence chseq) { |
| return BufferFactory.newCharBuffer(chseq); |
| } |
| |
| /** |
| * Creates a new char buffer by wrapping the given char sequence. |
| * <p> |
| * The new buffer's position will be {@code start}, limit will be |
| * {@code end}, capacity will be the length of the char sequence. The new |
| * buffer is read-only. |
| * |
| * @param chseq |
| * the char sequence which the new buffer will be based on. |
| * @param start |
| * the start index, must not be negative and not greater than |
| * {@code chseq.length()}. |
| * @param end |
| * the end index, must be no less than {@code start} and no |
| * greater than {@code chseq.length()}. |
| * @return the created char buffer. |
| * @exception IndexOutOfBoundsException |
| * if either {@code start} or {@code end} is invalid. |
| */ |
| public static CharBuffer wrap(CharSequence chseq, int start, int end) { |
| if (chseq == null) { |
| throw new NullPointerException(); |
| } |
| if (start < 0 || end < start || end > chseq.length()) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| CharBuffer result = BufferFactory.newCharBuffer(chseq); |
| result.position = start; |
| result.limit = end; |
| return result; |
| } |
| |
| /** |
| * Constructs a {@code CharBuffer} with given capacity. |
| * |
| * @param capacity |
| * the capacity of the buffer. |
| */ |
| CharBuffer(int capacity) { |
| super(capacity); |
| } |
| |
| /** |
| * Returns the char array which this buffer is based on, if there is one. |
| * |
| * @return the char array which this buffer is based on. |
| * @exception ReadOnlyBufferException |
| * if this buffer is based on an array, but it is read-only. |
| * @exception UnsupportedOperationException |
| * if this buffer is not based on an array. |
| */ |
| public final char[] array() { |
| return protectedArray(); |
| } |
| |
| /** |
| * Returns the offset of the char array which this buffer is based on, if |
| * there is one. |
| * <p> |
| * The offset is the index of the array corresponds to the zero position of |
| * the buffer. |
| * |
| * @return the offset of the char array which this buffer is based on. |
| * @exception ReadOnlyBufferException |
| * if this buffer is based on an array but it is read-only. |
| * @exception UnsupportedOperationException |
| * if this buffer is not based on an array. |
| */ |
| public final int arrayOffset() { |
| return protectedArrayOffset(); |
| } |
| |
| /** |
| * Returns a read-only buffer that shares its content with this buffer. |
| * <p> |
| * The returned buffer is guaranteed to be a new instance, even if this |
| * buffer is read-only itself. The new buffer's position, limit, capacity |
| * and mark are the same as this buffer's. |
| * <p> |
| * The new buffer shares its content with this buffer, which means this |
| * buffer's change of content will be visible to the new buffer. The two |
| * buffer's position, limit and mark are independent. |
| * |
| * @return a read-only version of this buffer. |
| */ |
| public abstract CharBuffer asReadOnlyBuffer(); |
| |
| /** |
| * Returns the character located at the specified index in the buffer. The |
| * index value is referenced from the current buffer position. |
| * |
| * @param index |
| * the index referenced from the current buffer position. It must |
| * not be less than zero but less than the value obtained from a |
| * call to {@code remaining()}. |
| * @return the character located at the specified index (referenced from the |
| * current position) in the buffer. |
| * @exception IndexOutOfBoundsException |
| * if the index is invalid. |
| */ |
| public final char charAt(int index) { |
| if (index < 0 || index >= remaining()) { |
| throw new IndexOutOfBoundsException(); |
| } |
| return get(position + index); |
| } |
| |
| /** |
| * Compacts this char buffer. |
| * <p> |
| * The remaining chars will be moved to the head of the buffer, |
| * starting from position zero. Then the position is set to |
| * {@code remaining()}; the limit is set to capacity; the mark is cleared. |
| * |
| * @return this buffer. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public abstract CharBuffer compact(); |
| |
| /** |
| * Compare the remaining chars of this buffer to another char |
| * buffer's remaining chars. |
| * |
| * @param otherBuffer |
| * another char buffer. |
| * @return a negative value if this is less than {@code otherBuffer}; 0 if |
| * this equals to {@code otherBuffer}; a positive value if this is |
| * greater than {@code otherBuffer}. |
| * @exception ClassCastException |
| * if {@code otherBuffer} is not a char buffer. |
| */ |
| public int compareTo(CharBuffer otherBuffer) { |
| int compareRemaining = (remaining() < otherBuffer.remaining()) ? remaining() |
| : otherBuffer.remaining(); |
| int thisPos = position; |
| int otherPos = otherBuffer.position; |
| char thisByte, otherByte; |
| while (compareRemaining > 0) { |
| thisByte = get(thisPos); |
| otherByte = otherBuffer.get(otherPos); |
| if (thisByte != otherByte) { |
| return thisByte < otherByte ? -1 : 1; |
| } |
| thisPos++; |
| otherPos++; |
| compareRemaining--; |
| } |
| return remaining() - otherBuffer.remaining(); |
| } |
| |
| /** |
| * Returns a duplicated buffer that shares its content with this buffer. |
| * <p> |
| * The duplicated buffer's initial position, limit, capacity and mark are |
| * the same as this buffer's. The duplicated buffer's read-only property and |
| * byte order are the same as this buffer's, too. |
| * <p> |
| * The new buffer shares its content with this buffer, which means either |
| * buffer's change of content will be visible to the other. The two buffer's |
| * position, limit and mark are independent. |
| * |
| * @return a duplicated buffer that shares its content with this buffer. |
| */ |
| public abstract CharBuffer duplicate(); |
| |
| /** |
| * Checks whether this char buffer is equal to another object. |
| * <p> |
| * If {@code other} is not a char buffer then {@code false} is returned. Two |
| * char buffers are equal if and only if their remaining chars are exactly |
| * the same. Position, limit, capacity and mark are not considered. |
| * |
| * @param other |
| * the object to compare with this char buffer. |
| * @return {@code true} if this char buffer is equal to {@code other}, |
| * {@code false} otherwise. |
| */ |
| @Override |
| public boolean equals(Object other) { |
| if (!(other instanceof CharBuffer)) { |
| return false; |
| } |
| CharBuffer otherBuffer = (CharBuffer) other; |
| |
| if (remaining() != otherBuffer.remaining()) { |
| return false; |
| } |
| |
| int myPosition = position; |
| int otherPosition = otherBuffer.position; |
| boolean equalSoFar = true; |
| while (equalSoFar && (myPosition < limit)) { |
| equalSoFar = get(myPosition++) == otherBuffer.get(otherPosition++); |
| } |
| |
| return equalSoFar; |
| } |
| |
| /** |
| * Returns the char at the current position and increases the position by 1. |
| * |
| * @return the char at the current position. |
| * @exception BufferUnderflowException |
| * if the position is equal or greater than limit. |
| */ |
| public abstract char get(); |
| |
| /** |
| * Reads chars from the current position into the specified char array and |
| * increases the position by the number of chars read. |
| * <p> |
| * Calling this method has the same effect as |
| * {@code get(dest, 0, dest.length)}. |
| * |
| * @param dest |
| * the destination char array. |
| * @return this buffer. |
| * @exception BufferUnderflowException |
| * if {@code dest.length} is greater than {@code remaining()}. |
| */ |
| public CharBuffer get(char[] dest) { |
| return get(dest, 0, dest.length); |
| } |
| |
| /** |
| * Reads chars from the current position into the specified char array, |
| * starting from the specified offset, and increases the position by the |
| * number of chars read. |
| * |
| * @param dest |
| * the target char array. |
| * @param off |
| * the offset of the char array, must not be negative and not |
| * greater than {@code dest.length}. |
| * @param len |
| * The number of chars to read, must be no less than zero and no |
| * greater than {@code dest.length - off}. |
| * @return this buffer. |
| * @exception IndexOutOfBoundsException |
| * if either {@code off} or {@code len} is invalid. |
| * @exception BufferUnderflowException |
| * if {@code len} is greater than {@code remaining()}. |
| */ |
| public CharBuffer get(char[] dest, int off, int len) { |
| int length = dest.length; |
| if ((off < 0) || (len < 0) || (long) off + (long) len > length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| if (len > remaining()) { |
| throw new BufferUnderflowException(); |
| } |
| for (int i = off; i < off + len; i++) { |
| dest[i] = get(); |
| } |
| return this; |
| } |
| |
| /** |
| * Returns a char at the specified index; the position is not changed. |
| * |
| * @param index |
| * the index, must not be negative and less than limit. |
| * @return a char at the specified index. |
| * @exception IndexOutOfBoundsException |
| * if index is invalid. |
| */ |
| public abstract char get(int index); |
| |
| /** |
| * Indicates whether this buffer is based on a char array and is read/write. |
| * |
| * @return {@code true} if this buffer is based on a byte array and provides |
| * read/write access, {@code false} otherwise. |
| */ |
| public final boolean hasArray() { |
| return protectedHasArray(); |
| } |
| |
| /** |
| * Calculates this buffer's hash code from the remaining chars. The |
| * position, limit, capacity and mark don't affect the hash code. |
| * |
| * @return the hash code calculated from the remaining chars. |
| */ |
| @Override |
| public int hashCode() { |
| int myPosition = position; |
| int hash = 0; |
| while (myPosition < limit) { |
| hash = hash + get(myPosition++); |
| } |
| return hash; |
| } |
| |
| /** |
| * Indicates whether this buffer is direct. A direct buffer will try its |
| * best to take advantage of native memory APIs and it may not stay in the |
| * Java heap, so it is not affected by garbage collection. |
| * <p> |
| * A char buffer is direct if it is based on a byte buffer and the byte |
| * buffer is direct. |
| * |
| * @return {@code true} if this buffer is direct, {@code false} otherwise. |
| */ |
| public abstract boolean isDirect(); |
| |
| /** |
| * Returns the number of remaining chars. |
| * |
| * @return the number of remaining chars. |
| */ |
| public final int length() { |
| return remaining(); |
| } |
| |
| /** |
| * Returns the byte order used by this buffer when converting chars from/to |
| * bytes. |
| * <p> |
| * If this buffer is not based on a byte buffer, then this always returns |
| * the platform's native byte order. |
| * |
| * @return the byte order used by this buffer when converting chars from/to |
| * bytes. |
| */ |
| public abstract ByteOrder order(); |
| |
| /** |
| * Child class implements this method to realize {@code array()}. |
| * |
| * @see #array() |
| */ |
| abstract char[] protectedArray(); |
| |
| /** |
| * Child class implements this method to realize {@code arrayOffset()}. |
| * |
| * @see #arrayOffset() |
| */ |
| abstract int protectedArrayOffset(); |
| |
| /** |
| * Child class implements this method to realize {@code hasArray()}. |
| * |
| * @see #hasArray() |
| */ |
| abstract boolean protectedHasArray(); |
| |
| /** |
| * Writes the given char to the current position and increases the position |
| * by 1. |
| * |
| * @param c |
| * the char to write. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if position is equal or greater than limit. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public abstract CharBuffer put(char c); |
| |
| /** |
| * Writes chars from the given char array to the current position and |
| * increases the position by the number of chars written. |
| * <p> |
| * Calling this method has the same effect as |
| * {@code put(src, 0, src.length)}. |
| * |
| * @param src |
| * the source char array. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code remaining()} is less than {@code src.length}. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public final CharBuffer put(char[] src) { |
| return put(src, 0, src.length); |
| } |
| |
| /** |
| * Writes chars from the given char array, starting from the specified offset, |
| * to the current position and increases the position by the number of chars |
| * written. |
| * |
| * @param src |
| * the source char array. |
| * @param off |
| * the offset of char array, must not be negative and not greater |
| * than {@code src.length}. |
| * @param len |
| * the number of chars to write, must be no less than zero and no |
| * greater than {@code src.length - off}. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code remaining()} is less than {@code len}. |
| * @exception IndexOutOfBoundsException |
| * if either {@code off} or {@code len} is invalid. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public CharBuffer put(char[] src, int off, int len) { |
| int length = src.length; |
| if ((off < 0) || (len < 0) || (long) off + (long) len > length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| if (len > remaining()) { |
| throw new BufferOverflowException(); |
| } |
| for (int i = off; i < off + len; i++) { |
| put(src[i]); |
| } |
| return this; |
| } |
| |
| /** |
| * Writes all the remaining chars of the {@code src} char buffer to this |
| * buffer's current position, and increases both buffers' position by the |
| * number of chars copied. |
| * |
| * @param src |
| * the source char buffer. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code src.remaining()} is greater than this buffer's |
| * {@code remaining()}. |
| * @exception IllegalArgumentException |
| * if {@code src} is this buffer. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public CharBuffer put(CharBuffer src) { |
| if (src == this) { |
| throw new IllegalArgumentException(); |
| } |
| if (src.remaining() > remaining()) { |
| throw new BufferOverflowException(); |
| } |
| |
| char[] contents = new char[src.remaining()]; |
| src.get(contents); |
| put(contents); |
| return this; |
| } |
| |
| /** |
| * Writes a char to the specified index of this buffer; the position is not |
| * changed. |
| * |
| * @param index |
| * the index, must be no less than zero and less than the limit. |
| * @param c |
| * the char to write. |
| * @return this buffer. |
| * @exception IndexOutOfBoundsException |
| * if index is invalid. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public abstract CharBuffer put(int index, char c); |
| |
| /** |
| * Writes all chars of the given string to the current position of this |
| * buffer, and increases the position by the length of string. |
| * <p> |
| * Calling this method has the same effect as |
| * {@code put(str, 0, str.length())}. |
| * |
| * @param str |
| * the string to write. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code remaining()} is less than the length of string. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public final CharBuffer put(String str) { |
| return put(str, 0, str.length()); |
| } |
| |
| /** |
| * Writes chars of the given string to the current position of this buffer, |
| * and increases the position by the number of chars written. |
| * |
| * @param str |
| * the string to write. |
| * @param start |
| * the first char to write, must not be negative and not greater |
| * than {@code str.length()}. |
| * @param end |
| * the last char to write (excluding), must be less than |
| * {@code start} and not greater than {@code str.length()}. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code remaining()} is less than {@code end - start}. |
| * @exception IndexOutOfBoundsException |
| * if either {@code start} or {@code end} is invalid. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public CharBuffer put(String str, int start, int end) { |
| int length = str.length(); |
| if (start < 0 || end < start || end > length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| if (end - start > remaining()) { |
| throw new BufferOverflowException(); |
| } |
| for (int i = start; i < end; i++) { |
| put(str.charAt(i)); |
| } |
| return this; |
| } |
| |
| /** |
| * Returns a sliced buffer that shares its content with this buffer. |
| * <p> |
| * The sliced buffer's capacity will be this buffer's {@code remaining()}, |
| * and its zero position will correspond to this buffer's current position. |
| * The new buffer's position will be 0, limit will be its capacity, and its |
| * mark is cleared. The new buffer's read-only property and byte order are |
| * same as this buffer. |
| * <p> |
| * The new buffer shares its content with this buffer, which means either |
| * buffer's change of content will be visible to the other. The two buffer's |
| * position, limit and mark are independent. |
| * |
| * @return a sliced buffer that shares its content with this buffer. |
| */ |
| public abstract CharBuffer slice(); |
| |
| /** |
| * Returns a new char buffer representing a sub-sequence of this buffer's |
| * current remaining content. |
| * <p> |
| * The new buffer's position will be {@code position() + start}, limit will |
| * be {@code position() + end}, capacity will be the same as this buffer. |
| * The new buffer's read-only property and byte order are the same as this |
| * buffer. |
| * <p> |
| * The new buffer shares its content with this buffer, which means either |
| * buffer's change of content will be visible to the other. The two buffer's |
| * position, limit and mark are independent. |
| * |
| * @param start |
| * the start index of the sub-sequence, referenced from the |
| * current buffer position. Must not be less than zero and not |
| * greater than the value obtained from a call to |
| * {@code remaining()}. |
| * @param end |
| * the end index of the sub-sequence, referenced from the current |
| * buffer position. Must not be less than {@code start} and not |
| * be greater than the value obtained from a call to |
| * {@code remaining()}. |
| * @return a new char buffer represents a sub-sequence of this buffer's |
| * current remaining content. |
| * @exception IndexOutOfBoundsException |
| * if either {@code start} or {@code end} is invalid. |
| */ |
| public abstract CharSequence subSequence(int start, int end); |
| |
| /** |
| * Returns a string representing the current remaining chars of this buffer. |
| * |
| * @return a string representing the current remaining chars of this buffer. |
| */ |
| @Override |
| public String toString() { |
| StringBuilder strbuf = new StringBuilder(); |
| for (int i = position; i < limit; i++) { |
| strbuf.append(get(i)); |
| } |
| return strbuf.toString(); |
| } |
| |
| /** |
| * Writes the given char to the current position and increases the position |
| * by 1. |
| * |
| * @param c |
| * the char to write. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if position is equal or greater than limit. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public CharBuffer append(char c) { |
| return put(c); |
| } |
| |
| /** |
| * Writes all chars of the given character sequence {@code csq} to the |
| * current position of this buffer, and increases the position by the length |
| * of the csq. |
| * <p> |
| * Calling this method has the same effect as {@code append(csq.toString())}. |
| * If the {@code CharSequence} is {@code null} the string "null" will be |
| * written to the buffer. |
| * |
| * @param csq |
| * the {@code CharSequence} to write. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code remaining()} is less than the length of csq. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public CharBuffer append(CharSequence csq) { |
| if (csq != null) { |
| return put(csq.toString()); |
| } |
| return put("null"); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Writes chars of the given {@code CharSequence} to the current position of |
| * this buffer, and increases the position by the number of chars written. |
| * |
| * @param csq |
| * the {@code CharSequence} to write. |
| * @param start |
| * the first char to write, must not be negative and not greater |
| * than {@code csq.length()}. |
| * @param end |
| * the last char to write (excluding), must be less than |
| * {@code start} and not greater than {@code csq.length()}. |
| * @return this buffer. |
| * @exception BufferOverflowException |
| * if {@code remaining()} is less than {@code end - start}. |
| * @exception IndexOutOfBoundsException |
| * if either {@code start} or {@code end} is invalid. |
| * @exception ReadOnlyBufferException |
| * if no changes may be made to the contents of this buffer. |
| */ |
| public CharBuffer append(CharSequence csq, int start, int end) { |
| if (csq == null) { |
| csq = "null"; //$NON-NLS-1$ |
| } |
| CharSequence cs = csq.subSequence(start, end); |
| if (cs.length() > 0) { |
| return put(cs.toString()); |
| } |
| return this; |
| } |
| |
| /** |
| * Reads characters from this buffer and puts them into {@code target}. The |
| * number of chars that are copied is either the number of remaining chars |
| * in this buffer or the number of remaining chars in {@code target}, |
| * whichever is smaller. |
| * |
| * @param target |
| * the target char buffer. |
| * @throws IllegalArgumentException |
| * if {@code target} is this buffer. |
| * @throws IOException |
| * if an I/O error occurs. |
| * @throws ReadOnlyBufferException |
| * if no changes may be made to the contents of {@code target}. |
| * @return the number of chars copied or -1 if there are no chars left to be |
| * read from this buffer. |
| */ |
| public int read(CharBuffer target) throws IOException { |
| int remaining = remaining(); |
| if (target == this) { |
| if (remaining == 0) { |
| return -1; |
| } |
| throw new IllegalArgumentException(); |
| } |
| if (remaining == 0) { |
| return limit > 0 && target.remaining() == 0 ? 0 : -1; |
| } |
| remaining = Math.min(target.remaining(), remaining); |
| if (remaining > 0) { |
| char[] chars = new char[remaining]; |
| get(chars); |
| target.put(chars); |
| } |
| return remaining; |
| } |
| } |