Java tutorial
/* * 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 com.google.gwt.corp.compatibility.Endianness; import com.google.gwt.corp.compatibility.StringToByteBuffer; /** A buffer for bytes. * <p> * A byte buffer can be created in either one of the following ways: * </p> * <ul> * <li>{@link #allocate(int) Allocate} a new byte array and create a buffer based on it;</li> * <li>{@link #allocateDirect(int) Allocate} a memory block and create a direct buffer based on it;</li> * <li>{@link #wrap(byte[]) Wrap} an existing byte array to create a new buffer.</li> * </ul> * @since Android 1.0 */ public abstract class ByteBuffer extends Buffer implements Comparable<ByteBuffer>, StringToByteBuffer { /** Creates a byte buffer based on a newly allocated byte array. * * @param capacity the capacity of the new buffer * @return the created byte buffer. * @throws IllegalArgumentException if {@code capacity < 0}. * @since Android 1.0 */ public static ByteBuffer allocate(int capacity) { if (capacity < 0) { throw new IllegalArgumentException(); } return BufferFactory.newByteBuffer(capacity); } /** Creates a direct byte buffer based on a newly allocated memory block. * * @param capacity the capacity of the new buffer * @return the created byte buffer. * @throws IllegalArgumentException if {@code capacity < 0}. * @since Android 1.0 */ public static ByteBuffer allocateDirect(int capacity) { if (capacity < 0) { throw new IllegalArgumentException(); } return BufferFactory.newDirectByteBuffer(capacity); } /** Creates a new byte buffer by wrapping the given byte array. * <p> * Calling this method has the same effect as {@code wrap(array, 0, array.length)}. * </p> * * @param array the byte array which the new buffer will be based on * @return the created byte buffer. * @since Android 1.0 */ public static ByteBuffer wrap(byte[] array) { return BufferFactory.newByteBuffer(array); } /** Creates a new byte buffer by wrapping the given byte 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. * </p> * * @param array the byte 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 byte buffer. * @exception IndexOutOfBoundsException if either {@code start} or {@code len} is invalid. * @since Android 1.0 */ public static ByteBuffer wrap(byte[] array, int start, int len) { int length = array.length; if ((start < 0) || (len < 0) || ((long) start + (long) len > length)) { throw new IndexOutOfBoundsException(); } ByteBuffer buf = BufferFactory.newByteBuffer(array); buf.position = start; buf.limit = start + len; return buf; } /** The byte order of this buffer, default is {@code BIG_ENDIAN}. */ Endianness order = Endianness.BIG_ENDIAN; /** Constructs a {@code ByteBuffer} with given capacity. * * @param capacity the capacity of the buffer. */ ByteBuffer(int capacity) { super(capacity); } /** Returns the byte array which this buffer is based on, if there is one. * * @return the byte array which this buffer is based on. * @exception ReadOnlyBufferException if this buffer is based on a read-only array. * @exception UnsupportedOperationException if this buffer is not based on an array. * @since Android 1.0 */ public final byte[] array() { return protectedArray(); } /** Returns the offset of the byte array which this buffer is based on, if there is one. * <p> * The offset is the index of the array which corresponds to the zero position of the buffer. * </p> * * @return the offset of the byte array which this buffer is based on. * @exception ReadOnlyBufferException if this buffer is based on a read-only array. * @exception UnsupportedOperationException if this buffer is not based on an array. * @since Android 1.0 */ public final int arrayOffset() { return protectedArrayOffset(); } /** Returns a char buffer which is based on the remaining content of this byte buffer. * <p> * The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is * not set. The new buffer's read-only property and byte order are the same as this buffer's. The new buffer is direct if this * byte buffer is direct. * </p> * <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. * </p> * * @return a char buffer which is based on the content of this byte buffer. * @since Android 1.0 */ public abstract CharBuffer asCharBuffer(); /** Returns a double buffer which is based on the remaining content of this byte buffer. * <p> * The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by eight, and its mark is * not set. The new buffer's read-only property and byte order are the same as this buffer's. The new buffer is direct if this * byte buffer is direct. * </p> * <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. * </p> * * @return a double buffer which is based on the content of this byte buffer. * @since Android 1.0 */ public abstract DoubleBuffer asDoubleBuffer(); /** Returns a float buffer which is based on the remaining content of this byte buffer. * <p> * The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by four, and its mark is * not set. The new buffer's read-only property and byte order are the same as this buffer's. The new buffer is direct if this * byte buffer is direct. * </p> * <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. * </p> * * @return a float buffer which is based on the content of this byte buffer. * @since Android 1.0 */ public abstract FloatBuffer asFloatBuffer(); /** Returns a int buffer which is based on the remaining content of this byte buffer. * <p> * The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by four, and its mark is * not set. The new buffer's read-only property and byte order are the same as this buffer's. The new buffer is direct if this * byte buffer is direct. * </p> * <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. * </p> * * @return a int buffer which is based on the content of this byte buffer. * @since Android 1.0 */ public abstract IntBuffer asIntBuffer(); /** Returns a long buffer which is based on the remaining content of this byte buffer. * <p> * The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by eight, and its mark is * not set. The new buffer's read-only property and byte order are the same as this buffer's. The new buffer is direct if this * byte buffer is direct. * </p> * <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. * </p> * * @return a long buffer which is based on the content of this byte buffer. * @since Android 1.0 */ public abstract LongBuffer asLongBuffer(); /** 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. * </p> * <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. * </p> * * @return a read-only version of this buffer. * @since Android 1.0 */ public abstract ByteBuffer asReadOnlyBuffer(); /** Returns a short buffer which is based on the remaining content of this byte buffer. * <p> * The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is * not set. The new buffer's read-only property and byte order are the same as this buffer's. The new buffer is direct if this * byte buffer is direct. * </p> * <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. * </p> * * @return a short buffer which is based on the content of this byte buffer. * @since Android 1.0 */ public abstract ShortBuffer asShortBuffer(); /** Compacts this byte buffer. * <p> * The remaining bytes 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. * </p> * * @return this buffer. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer compact(); /** Compares the remaining bytes of this buffer to another byte buffer's remaining bytes. * * @param otherBuffer another byte buffer. * @return a negative value if this is less than {@code other}; 0 if this equals to {@code other}; a positive value if this is * greater than {@code other}. * @exception ClassCastException if {@code other} is not a byte buffer. * @since Android 1.0 */ public int compareTo(ByteBuffer otherBuffer) { int compareRemaining = (remaining() < otherBuffer.remaining()) ? remaining() : otherBuffer.remaining(); int thisPos = position; int otherPos = otherBuffer.position; byte 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 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> * <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. * </p> * * @return a duplicated buffer that shares its content with this buffer. * @since Android 1.0 */ public abstract ByteBuffer duplicate(); /** Checks whether this byte buffer is equal to another object. * <p> * If {@code other} is not a byte buffer then {@code false} is returned. Two byte buffers are equal if and only if their * remaining bytes are exactly the same. Position, limit, capacity and mark are not considered. * </p> * * @param other the object to compare with this byte buffer. * @return {@code true} if this byte buffer is equal to {@code other}, {@code false} otherwise. * @since Android 1.0 */ public boolean equals(Object other) { if (!(other instanceof ByteBuffer)) { return false; } ByteBuffer otherBuffer = (ByteBuffer) 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 byte at the current position and increases the position by 1. * * @return the byte at the current position. * @exception BufferUnderflowException if the position is equal or greater than limit. * @since Android 1.0 */ public abstract byte get(); /** Reads bytes from the current position into the specified byte array and increases the position by the number of bytes read. * <p> * Calling this method has the same effect as {@code get(dest, 0, dest.length)}. * </p> * * @param dest the destination byte array. * @return this buffer. * @exception BufferUnderflowException if {@code dest.length} is greater than {@code remaining()}. * @since Android 1.0 */ public ByteBuffer get(byte[] dest) { return get(dest, 0, dest.length); } /** Reads bytes from the current position into the specified byte array, starting at the specified offset, and increases the * position by the number of bytes read. * * @param dest the target byte array. * @param off the offset of the byte array, must not be negative and not greater than {@code dest.length}. * @param len the number of bytes to read, must not be negative and not 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()}. * @since Android 1.0 */ public ByteBuffer get(byte[] 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 the byte at the specified index and does not change the position. * * @param index the index, must not be negative and less than limit. * @return the byte at the specified index. * @exception IndexOutOfBoundsException if index is invalid. * @since Android 1.0 */ public abstract byte get(int index); /** Returns the char at the current position and increases the position by 2. * <p> * The 2 bytes starting at the current position are composed into a char according to the current byte order and returned. * </p> * * @return the char at the current position. * @exception BufferUnderflowException if the position is greater than {@code limit - 2}. * @since Android 1.0 */ public abstract char getChar(); /** Returns the char at the specified index. * <p> * The 2 bytes starting from the specified index are composed into a char according to the current byte order and returned. The * position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 2}. * @return the char at the specified index. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @since Android 1.0 */ public abstract char getChar(int index); /** Returns the double at the current position and increases the position by 8. * <p> * The 8 bytes starting from the current position are composed into a double according to the current byte order and returned. * </p> * * @return the double at the current position. * @exception BufferUnderflowException if the position is greater than {@code limit - 8}. * @since Android 1.0 */ public abstract double getDouble(); /** Returns the double at the specified index. * <p> * The 8 bytes starting at the specified index are composed into a double according to the current byte order and returned. The * position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 8}. * @return the double at the specified index. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @since Android 1.0 */ public abstract double getDouble(int index); /** Returns the float at the current position and increases the position by 4. * <p> * The 4 bytes starting at the current position are composed into a float according to the current byte order and returned. * </p> * * @return the float at the current position. * @exception BufferUnderflowException if the position is greater than {@code limit - 4}. * @since Android 1.0 */ public abstract float getFloat(); /** Returns the float at the specified index. * <p> * The 4 bytes starting at the specified index are composed into a float according to the current byte order and returned. The * position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 4}. * @return the float at the specified index. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @since Android 1.0 */ public abstract float getFloat(int index); /** Returns the int at the current position and increases the position by 4. * <p> * The 4 bytes starting at the current position are composed into a int according to the current byte order and returned. * </p> * * @return the int at the current position. * @exception BufferUnderflowException if the position is greater than {@code limit - 4}. * @since Android 1.0 */ public abstract int getInt(); /** Returns the int at the specified index. * <p> * The 4 bytes starting at the specified index are composed into a int according to the current byte order and returned. The * position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 4}. * @return the int at the specified index. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @since Android 1.0 */ public abstract int getInt(int index); /** Returns the long at the current position and increases the position by 8. * <p> * The 8 bytes starting at the current position are composed into a long according to the current byte order and returned. * </p> * * @return the long at the current position. * @exception BufferUnderflowException if the position is greater than {@code limit - 8}. * @since Android 1.0 */ public abstract long getLong(); /** Returns the long at the specified index. * <p> * The 8 bytes starting at the specified index are composed into a long according to the current byte order and returned. The * position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 8}. * @return the long at the specified index. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @since Android 1.0 */ public abstract long getLong(int index); /** Returns the short at the current position and increases the position by 2. * <p> * The 2 bytes starting at the current position are composed into a short according to the current byte order and returned. * </p> * * @return the short at the current position. * @exception BufferUnderflowException if the position is greater than {@code limit - 2}. * @since Android 1.0 */ public abstract short getShort(); /** Returns the short at the specified index. * <p> * The 2 bytes starting at the specified index are composed into a short according to the current byte order and returned. The * position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 2}. * @return the short at the specified index. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @since Android 1.0 */ public abstract short getShort(int index); /** Indicates whether this buffer is based on a byte array and provides read/write access. * * @return {@code true} if this buffer is based on a byte array and provides read/write access, {@code false} otherwise. * @since Android 1.0 */ 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 bytes. * @since Android 1.0 */ public int hashCode() { int myPosition = position; int hash = 0; while (myPosition < limit) { hash = hash + get(myPosition++); } return hash; } /** Indicates whether this buffer is direct. * * @return {@code true} if this buffer is direct, {@code false} otherwise. * @since Android 1.0 */ public abstract boolean isDirect(); /** Returns the byte order used by this buffer when converting bytes from/to other primitive types. * <p> * The default byte order of byte buffer is always {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN} * </p> * * @return the byte order used by this buffer when converting bytes from/to other primitive types. * @since Android 1.0 */ public final ByteOrder order() { return order == Endianness.BIG_ENDIAN ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN; } /** Sets the byte order of this buffer. * * @param byteOrder the byte order to set. If {@code null} then the order will be {@link ByteOrder#LITTLE_ENDIAN LITTLE_ENDIAN} * . * @return this buffer. * @see ByteOrder * @since Android 1.0 */ public final ByteBuffer order(ByteOrder byteOrder) { return orderImpl(byteOrder); } ByteBuffer orderImpl(ByteOrder byteOrder) { order = byteOrder == ByteOrder.BIG_ENDIAN ? Endianness.BIG_ENDIAN : Endianness.LITTLE_ENDIAN; return this; } /** Child class implements this method to realize {@code array()}. * * @see #array() * @since Android 1.0 */ abstract byte[] protectedArray(); /** Child class implements this method to realize {@code arrayOffset()}. * * @see #arrayOffset() * @since Android 1.0 */ abstract int protectedArrayOffset(); /** Child class implements this method to realize {@code hasArray()}. * * @see #hasArray() * @since Android 1.0 */ abstract boolean protectedHasArray(); /** Writes the given byte to the current position and increases the position by 1. * * @param b the byte 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. * @since Android 1.0 */ public abstract ByteBuffer put(byte b); /** Writes bytes in the given byte array to the current position and increases the position by the number of bytes written. * <p> * Calling this method has the same effect as {@code put(src, 0, src.length)}. * </p> * * @param src the source byte 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. * @since Android 1.0 */ public final ByteBuffer put(byte[] src) { return put(src, 0, src.length); } /** Writes bytes in the given byte array, starting from the specified offset, to the current position and increases the position * by the number of bytes written. * * @param src the source byte array. * @param off the offset of byte array, must not be negative and not greater than {@code src.length}. * @param len the number of bytes to write, must not be negative and not 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. * @since Android 1.0 */ public ByteBuffer put(byte[] 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 bytes of the {@code src} byte buffer to this buffer's current position, and increases both buffers' * position by the number of bytes copied. * * @param src the source byte 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. * @since Android 1.0 */ public ByteBuffer put(ByteBuffer src) { if (src == this) { throw new IllegalArgumentException(); } if (src.remaining() > remaining()) { throw new BufferOverflowException(); } byte[] contents = new byte[src.remaining()]; src.get(contents); put(contents); return this; } /** Write a byte to the specified index of this buffer without changing the position. * * @param index the index, must not be negative and less than the limit. * @param b the byte to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer put(int index, byte b); /** Writes the given char to the current position and increases the position by 2. * <p> * The char is converted to bytes using the current byte order. * </p> * * @param value the char to write. * @return this buffer. * @exception BufferOverflowException if position is greater than {@code limit - 2}. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putChar(char value); /** Writes the given char to the specified index of this buffer. * <p> * The char is converted to bytes using the current byte order. The position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 2}. * @param value the char to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putChar(int index, char value); /** Writes the given double to the current position and increases the position by 8. * <p> * The double is converted to bytes using the current byte order. * </p> * * @param value the double to write. * @return this buffer. * @exception BufferOverflowException if position is greater than {@code limit - 8}. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putDouble(double value); /** Writes the given double to the specified index of this buffer. * <p> * The double is converted to bytes using the current byte order. The position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 8}. * @param value the double to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putDouble(int index, double value); /** Writes the given float to the current position and increases the position by 4. * <p> * The float is converted to bytes using the current byte order. * </p> * * @param value the float to write. * @return this buffer. * @exception BufferOverflowException if position is greater than {@code limit - 4}. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putFloat(float value); /** Writes the given float to the specified index of this buffer. * <p> * The float is converted to bytes using the current byte order. The position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 4}. * @param value the float to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putFloat(int index, float value); /** Writes the given int to the current position and increases the position by 4. * <p> * The int is converted to bytes using the current byte order. * </p> * * @param value the int to write. * @return this buffer. * @exception BufferOverflowException if position is greater than {@code limit - 4}. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putInt(int value); /** Writes the given int to the specified index of this buffer. * <p> * The int is converted to bytes using the current byte order. The position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 4}. * @param value the int to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putInt(int index, int value); /** Writes the given long to the current position and increases the position by 8. * <p> * The long is converted to bytes using the current byte order. * </p> * * @param value the long to write. * @return this buffer. * @exception BufferOverflowException if position is greater than {@code limit - 8}. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putLong(long value); /** Writes the given long to the specified index of this buffer. * <p> * The long is converted to bytes using the current byte order. The position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 8}. * @param value the long to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putLong(int index, long value); /** Writes the given short to the current position and increases the position by 2. * <p> * The short is converted to bytes using the current byte order. * </p> * * @param value the short to write. * @return this buffer. * @exception BufferOverflowException if position is greater than {@code limit - 2}. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putShort(short value); /** Writes the given short to the specified index of this buffer. * <p> * The short is converted to bytes using the current byte order. The position is not changed. * </p> * * @param index the index, must not be negative and equal or less than {@code limit - 2}. * @param value the short to write. * @return this buffer. * @exception IndexOutOfBoundsException if {@code index} is invalid. * @exception ReadOnlyBufferException if no changes may be made to the contents of this buffer. * @since Android 1.0 */ public abstract ByteBuffer putShort(int index, short value); /** 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 it's 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 the same as this buffer's. * </p> * <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. * </p> * * @return a sliced buffer that shares its content with this buffer. * @since Android 1.0 */ public abstract ByteBuffer slice(); /** Returns a string representing the state of this byte buffer. * * @return a string representing the state of this byte buffer. * @since Android 1.0 */ public String toString() { StringBuffer buf = new StringBuffer(); buf.append(getClass().getName()); buf.append(", status: capacity="); //$NON-NLS-1$ buf.append(capacity()); buf.append(" position="); //$NON-NLS-1$ buf.append(position()); buf.append(" limit="); //$NON-NLS-1$ buf.append(limit()); return buf.toString(); } public ByteBuffer stringToByteBuffer(String s) { return new StringByteBuffer(s); } }