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/*
* 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;
/** A buffer of longs.
*
* A long buffer can be created in either of the following ways:
*
*
* - {@link #allocate(int) Allocate} a new long array and create a buffer based on it;
* - {@link #wrap(long[]) Wrap} an existing long array to create a new buffer;
* - Use {@link java.nio.ByteBuffer#asLongBuffer() ByteBuffer.asLongBuffer} to create a long
* buffer based on a byte buffer.
*
*/
public abstract class LongBuffer extends Buffer implements Comparable {
// /** Creates a long buffer based on a newly allocated long array.
// *
// * @param capacity the capacity of the new buffer.
// * @return the created long buffer.
// * @throws IllegalArgumentException if {@code capacity} is less than zero.
// */
// public static LongBuffer allocate (int capacity) {
// if (capacity < 0) {
// throw new IllegalArgumentException();
// }
// ByteBuffer bb = ByteBuffer.allocateDirect(capacity * 8);
// bb.order(ByteOrder.nativeOrder());
// return bb.asLongBuffer();
// }
/** Constructs a {@code LongBuffer} with given capacity.
*
* @param capacity The capacity of the buffer */
LongBuffer (int capacity) {
super(capacity);
}
/** Returns the long array which this buffer is based on, if there is one.
*
* @return the long 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 long[] array () {
return protectedArray();
}
/** Returns the offset of the long array which this buffer is based on, if there is one.
*
* The offset is the index of the array and corresponds to the zero position of the buffer.
*
*
* @return the offset of the long 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.
* 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.
*
* 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 LongBuffer asReadOnlyBuffer ();
/** Compacts this long buffer.
* The remaining longs will be moved to the head of the buffer, staring 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 LongBuffer compact ();
/** Compare the remaining longs of this buffer to another long buffer's remaining longs.
*
* @param otherBuffer another long 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 long buffer.
*/
public int compareTo (LongBuffer otherBuffer) {
int compareRemaining = (remaining() < otherBuffer.remaining()) ?
remaining() : otherBuffer.remaining();
int thisPos = position;
int otherPos = otherBuffer.position;
// BEGIN android-changed
long thisLong, otherLong;
while (compareRemaining > 0) {
thisLong = get(thisPos);
otherLong = otherBuffer.get(otherPos);
if (thisLong != otherLong) {
return thisLong < otherLong ? -1 : 1;
}
thisPos++;
otherPos++;
compareRemaining--;
}
// END android-changed
return remaining() - otherBuffer.remaining();
}
/** Returns a duplicated buffer that shares its content with this buffer.
* The duplicated buffer's position, limit, capacity and mark are the same as this buffer.
* The duplicated buffer's read-only property and byte order are same as this buffer's, too.
*
* 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 LongBuffer duplicate ();
/** Checks whether this long buffer is equal to another object.
* If {@code other} is not a long buffer then {@code false} is returned. Two long buffers
* are equal if and only if their remaining longs are exactly the same. Position, limit,
* capacity and mark are not considered.
*
* @param other the object to compare with this long buffer.
* @return {@code true} if this long buffer is equal to {@code other}, {@code false} otherwise.
*/
public boolean equals (Object other) {
if (!(other instanceof LongBuffer)) {
return false;
}
LongBuffer otherBuffer = (LongBuffer)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 long at the current position and increase the position by 1.
*
* @return the long at the current position.
* @exception BufferUnderflowException if the position is equal or greater than limit.
*/
public abstract long get ();
/** Reads longs from the current position into the specified long array and increases the
* position by the number of longs read.
* Calling this method has the same effect as {@code get(dest, 0, dest.length)}.
*
* @param dest the destination long array.
* @return this buffer.
* @exception BufferUnderflowException if {@code dest.length} is greater than {@code remaining()}.
*/
public LongBuffer get (long[] dest) {
return get(dest, 0, dest.length);
}
/** Reads longs from the current position into the specified long array, starting from the
* specified offset, and increase the position by the number of longs read.
*
* @param dest the target long array.
* @param off the offset of the long array, must not be negative and not greater than {@code
* dest.length}.
* @param len the number of longs to read, must be no less than zero 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()}.
*/
public LongBuffer get (long[] dest, int off, int len) {
int length = dest.length;
if (off < 0 || len < 0 || (long)len + (long)off > 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 long at the specified index; the position is not changed.
*
* @param index the index, must not be negative and less than limit.
* @return the long at the specified index.
* @exception IndexOutOfBoundsException if index is invalid.
*/
public abstract long get (int index);
/** Indicates whether this buffer is based on a long array and is read/write.
*
* @return {@code true} if this buffer is based on a long 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 longs.
*/
public int hashCode () {
int myPosition = position;
int hash = 0;
long l;
while (myPosition < limit) {
l = get(myPosition++);
hash = hash + ((int)l) ^ ((int)(l >> 32));
}
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.
*
* A long 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 byte order used by this buffer when converting longs from/to bytes.
* If this buffer is not based on a byte buffer, then always return the platform's native
* byte order.
*
* @return the byte order used by this buffer when converting longs from/to bytes.
*/
public abstract ByteOrder order ();
/** Child class implements this method to realize {@code array()}.
*
* @return see {@code array()} */
abstract long[] protectedArray ();
/** Child class implements this method to realize {@code arrayOffset()}.
*
* @return see {@code arrayOffset()} */
abstract int protectedArrayOffset ();
/** Child class implements this method to realize {@code hasArray()}.
*
* @return see {@code hasArray()} */
abstract boolean protectedHasArray ();
/** Writes the given long to the current position and increases the position by 1.
*
* @param l the long 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 LongBuffer put (long l);
/** Writes longs from the given long array to the current position and increases the position
* by the number of longs written.
* Calling this method has the same effect as {@code put(src, 0, src.length)}.
*
* @param src the source long 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 LongBuffer put (long[] src) {
return put(src, 0, src.length);
}
/** Writes longs from the given long array, starting from the specified offset, to the current
* position and increases the position by the number of longs written.
*
* @param src the source long array.
* @param off the offset of long array, must not be negative and not greater than {@code src.length}.
* @param len the number of longs to write, must be no less than zero 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.
*/
public LongBuffer put (long[] src, int off, int len) {
int length = src.length;
if (off < 0 || len < 0 || (long)len + (long)off > 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 longs of the {@code src} long buffer to this buffer's current
* position, and increases both buffers' position by the number of longs copied.
*
* @param src the source long 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 LongBuffer put (LongBuffer src) {
if (src == this) {
throw new IllegalArgumentException();
}
if (src.remaining() > remaining()) {
throw new BufferOverflowException();
}
long[] contents = new long[src.remaining()];
src.get(contents);
put(contents);
return this;
}
/** Writes a long to the specified index of this buffer; the position is not changed.
*
* @param index the index, must not be negative and less than the limit.
* @param l the long 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 LongBuffer put (int index, long l);
/** Returns a sliced buffer that shares its content with this buffer.
* 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's.
* 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 LongBuffer slice ();
/** Returns a string representing the state of this long buffer.
*
* @return a string representing the state of this long buffer.
*/
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();
}
}