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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 ints.
*
* A int buffer can be created in either of the following ways:
*
*
* - {@link #allocate(int) Allocate} a new int array and create a buffer based on it;
* - {@link #wrap(int[]) Wrap} an existing int array to create a new buffer;
* - Use {@link java.nio.ByteBuffer#asIntBuffer() ByteBuffer.asIntBuffer} to create a int buffer based on a byte buffer.
*
*
* @since Android 1.0 */
public abstract class IntBuffer extends Buffer implements Comparable {
/** Creates an int buffer based on a newly allocated int array.
*
* @param capacity the capacity of the new buffer.
* @return the created int buffer.
* @throws IllegalArgumentException if {@code capacity} is less than zero.
* @since Android 1.0 */
public static IntBuffer allocate (int capacity) {
if (capacity < 0) {
throw new IllegalArgumentException();
}
return BufferFactory.newIntBuffer(capacity);
}
/** Creates a new int buffer by wrapping the given int array.
*
* Calling this method has the same effect as {@code wrap(array, 0, array.length)}.
*
*
* @param array the int array which the new buffer will be based on.
* @return the created int buffer.
* @since Android 1.0 */
public static IntBuffer wrap (int[] array) {
return wrap(array, 0, array.length);
}
/** Creates a new int buffer by wrapping the given int array.
*
* 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 int 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 int buffer.
* @exception IndexOutOfBoundsException if either {@code start} or {@code len} is invalid.
* @since Android 1.0 */
public static IntBuffer wrap (int[] array, int start, int len) {
if (array == null) {
throw new NullPointerException();
}
if (start < 0 || len < 0 || (long)len + (long)start > array.length) {
throw new IndexOutOfBoundsException();
}
IntBuffer buf = BufferFactory.newIntBuffer(array);
buf.position = start;
buf.limit = start + len;
return buf;
}
/** Constructs a {@code IntBuffer} with given capacity.
*
* @param capacity the capacity of the buffer. */
IntBuffer (int capacity) {
super(capacity);
}
/** Returns the int array which this buffer is based on, if there is one.
*
* @return the int 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.
* @since Android 1.0 */
public final int[] array () {
return protectedArray();
}
/** Returns the offset of the int array which this buffer is based on, if there is one.
*
* The offset is the index of the array corresponds to the zero position of the buffer.
*
*
* @return the offset of the int 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.
* @since Android 1.0 */
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 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.
* @since Android 1.0 */
public abstract IntBuffer asReadOnlyBuffer ();
/** Compacts this int buffer.
*
* The remaining ints 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.
* @since Android 1.0 */
public abstract IntBuffer compact ();
/** Compares the remaining ints of this buffer to another int buffer's remaining ints.
*
* @param otherBuffer another int 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 an int buffer.
* @since Android 1.0 */
public int compareTo (IntBuffer otherBuffer) {
int compareRemaining = (remaining() < otherBuffer.remaining()) ? remaining() : otherBuffer.remaining();
int thisPos = position;
int otherPos = otherBuffer.position;
// BEGIN android-changed
int thisInt, otherInt;
while (compareRemaining > 0) {
thisInt = get(thisPos);
otherInt = otherBuffer.get(otherPos);
if (thisInt != otherInt) {
return thisInt < otherInt ? -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 the 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 duplicated buffer that shares its content with this buffer.
* @since Android 1.0 */
public abstract IntBuffer duplicate ();
/** Checks whether this int buffer is equal to another object.
*
* If {@code other} is not a int buffer then {@code false} is returned. Two int buffers are equal if and only if their remaining
* ints are exactly the same. Position, limit, capacity and mark are not considered.
*
*
* @param other the object to compare with this int buffer.
* @return {@code true} if this int buffer is equal to {@code other}, {@code false} otherwise.
* @since Android 1.0 */
public boolean equals (Object other) {
if (!(other instanceof IntBuffer)) {
return false;
}
IntBuffer otherBuffer = (IntBuffer)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 int at the current position and increases the position by 1.
*
* @return the int at the current position.
* @exception BufferUnderflowException if the position is equal or greater than limit.
* @since Android 1.0 */
public abstract int get ();
/** Reads ints from the current position into the specified int array and increases the position by the number of ints read.
*
* Calling this method has the same effect as {@code get(dest, 0, dest.length)}.
*
*
* @param dest the destination int array.
* @return this buffer.
* @exception BufferUnderflowException if {@code dest.length} is greater than {@code remaining()}.
* @since Android 1.0 */
public IntBuffer get (int[] dest) {
return get(dest, 0, dest.length);
}
/** Reads ints from the current position into the specified int array, starting from the specified offset, and increases the
* position by the number of ints read.
*
* @param dest the target int array.
* @param off the offset of the int array, must not be negative and not greater than {@code dest.length}.
* @param len the number of ints 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()}.
* @since Android 1.0 */
public IntBuffer get (int[] 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 an int at the specified index; the position is not changed.
*
* @param index the index, must not be negative and less than limit.
* @return an int at the specified index.
* @exception IndexOutOfBoundsException if index is invalid.
* @since Android 1.0 */
public abstract int get (int index);
/** Indicates whether this buffer is based on a int array and is read/write.
*
* @return {@code true} if this buffer is based on a int 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 ints.
* @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. 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.
*
* An int 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.
* @since Android 1.0 */
public abstract boolean isDirect ();
/** Returns the byte order used by this buffer when converting ints 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 ints from/to bytes.
* @since Android 1.0 */
public abstract ByteOrder order ();
/** Child class implements this method to realize {@code array()}.
*
* @return see {@code array()} */
protected abstract int[] protectedArray ();
/** Child class implements this method to realize {@code arrayOffset()}.
*
* @return see {@code arrayOffset()} */
protected abstract int protectedArrayOffset ();
/** Child class implements this method to realize {@code hasArray()}.
*
* @return see {@code hasArray()} */
protected abstract boolean protectedHasArray ();
/** Writes the given int to the current position and increases the position by 1.
*
* @param i the int 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 IntBuffer put (int i);
/** Writes ints from the given int array to the current position and increases the position by the number of ints written.
*
* Calling this method has the same effect as {@code put(src, 0, src.length)}.
*
*
* @param src the source int 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 IntBuffer put (int[] src) {
return put(src, 0, src.length);
}
/** Writes ints from the given int array, starting from the specified offset, to the current position and increases the position
* by the number of ints written.
*
* @param src the source int array.
* @param off the offset of int array, must not be negative and not greater than {@code src.length}.
* @param len the number of ints 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.
* @since Android 1.0 */
public IntBuffer put (int[] 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 ints of the {@code src} int buffer to this buffer's current position, and increases both buffers'
* position by the number of ints copied.
*
* @param src the source int 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 IntBuffer put (IntBuffer src) {
if (src == this) {
throw new IllegalArgumentException();
}
if (src.remaining() > remaining()) {
throw new BufferOverflowException();
}
int[] contents = new int[src.remaining()];
src.get(contents);
put(contents);
return this;
}
/** Write a int 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 i the int 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.
* @since Android 1.0 */
public abstract IntBuffer put (int index, int i);
/** 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.
* @since Android 1.0 */
public abstract IntBuffer slice ();
/** Returns a string represents of the state of this int buffer.
*
* @return a string represents of the state of this int 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();
}
}