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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 org.apache.mina.util.byteaccess;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.util.byteaccess.ByteArrayList.Node;
/**
* A ByteArray composed of other ByteArrays. Optimized for fast relative access
* via cursors. Absolute access methods are provided, but may perform poorly.
*
* TODO: Write about laziness of cursor implementation - how movement doesn't
* happen until actual get/put.
*
* @author Apache MINA Project
*/
public final class CompositeByteArray extends AbstractByteArray {
/**
* Allows for efficient detection of component boundaries when using a cursor.
*
* TODO: Is this interface right?
*/
public interface CursorListener {
/**
* Called when the first component in the composite is entered by the cursor.
*
* @param componentIndex The component position
* @param component The component to use
*/
void enteredFirstComponent(int componentIndex, ByteArray component);
/**
* Called when the next component in the composite is entered by the cursor.
*
* @param componentIndex The component position
* @param component The component to use
*/
void enteredNextComponent(int componentIndex, ByteArray component);
/**
* Called when the previous component in the composite is entered by the cursor.
*
* @param componentIndex The component position
* @param component The component to use
*/
void enteredPreviousComponent(int componentIndex, ByteArray component);
/**
* Called when the last component in the composite is entered by the cursor.
*
* @param componentIndex The component position
* @param component The component to use
*/
void enteredLastComponent(int componentIndex, ByteArray component);
}
/**
* Stores the underlying ByteArrays.
*/
private final ByteArrayList bas = new ByteArrayList();
/**
* The byte order for data in the buffer
*/
private ByteOrder order;
/**
* May be used in getSingleIoBuffer. Optional.
*/
private final ByteArrayFactory byteArrayFactory;
/**
* Creates a new instance of CompositeByteArray.
*/
public CompositeByteArray() {
this(null);
}
/**
*
* Creates a new instance of CompositeByteArray.
*
* @param byteArrayFactory
* The factory used to create the ByteArray objects
*/
public CompositeByteArray(ByteArrayFactory byteArrayFactory) {
this.byteArrayFactory = byteArrayFactory;
}
/**
* @return the first {@link ByteArray} in the list
*/
public ByteArray getFirst() {
if (bas.isEmpty()) {
return null;
}
return bas.getFirst().getByteArray();
}
/**
* Adds the specified {@link ByteArray} to the first
* position in the list
*
* @param ba The ByteArray to add to the list
*/
public void addFirst(ByteArray ba) {
addHook(ba);
bas.addFirst(ba);
}
/**
* Remove the first {@link ByteArray} in the list
*
* @return The first ByteArray in the list
*/
public ByteArray removeFirst() {
Node node = bas.removeFirst();
return node == null ? null : node.getByteArray();
}
/**
* Remove component ByteArrays to the given index (splitting
* them if necessary) and returning them in a single ByteArray.
* The caller is responsible for freeing the returned object.
*
* TODO: Document free behaviour more thoroughly.
*
* @param index The index from where we will remove bytes
* @return The resulting byte aaay
*/
public ByteArray removeTo(int index) {
if (index < first() || index > last()) {
throw new IndexOutOfBoundsException();
}
// Removing
CompositeByteArray prefix = new CompositeByteArray(byteArrayFactory);
int remaining = index - first();
while (remaining > 0) {
ByteArray component = removeFirst();
if (component.last() <= remaining) {
// Remove entire component.
prefix.addLast(component);
remaining -= component.last();
} else {
// Remove part of component. Do this by removing entire
// component then readding remaining bytes.
// TODO: Consider using getIoBuffers(), as would avoid
// performance problems for nested ComponentByteArrays.
IoBuffer bb = component.getSingleIoBuffer();
// get the limit of the buffer
int originalLimit = bb.limit();
// set the position to the beginning of the buffer
bb.position(0);
// set the limit of the buffer to what is remaining
bb.limit(remaining);
// create a new IoBuffer, sharing the data with 'bb'
IoBuffer bb1 = bb.slice();
// set the position at the end of the buffer
bb.position(remaining);
// gets the limit of the buffer
bb.limit(originalLimit);
// create a new IoBuffer, sharing teh data with 'bb'
IoBuffer bb2 = bb.slice();
// create a new ByteArray with 'bb1'
ByteArray ba1 = new BufferByteArray(bb1) {
@Override
public void free() {
// Do not free. This will get freed
}
};
// add the new ByteArray to the CompositeByteArray
prefix.addLast(ba1);
remaining -= ba1.last();
// final for anonymous inner class
final ByteArray componentFinal = component;
ByteArray ba2 = new BufferByteArray(bb2) {
@Override
public void free() {
componentFinal.free();
}
};
// add the new ByteArray to the CompositeByteArray
addFirst(ba2);
}
}
// return the CompositeByteArray
return prefix;
}
/**
* Adds the specified {@link ByteArray} to the end of the list
*
* @param ba The ByteArray to add to the end of the list
*/
public void addLast(ByteArray ba) {
addHook(ba);
bas.addLast(ba);
}
/**
* Removes the last {@link ByteArray} in the list
*
* @return The ByteArray that was removed
*/
public ByteArray removeLast() {
Node node = bas.removeLast();
return node == null ? null : node.getByteArray();
}
/**
* {@inheritDoc}
*/
@Override
public void free() {
while (!bas.isEmpty()) {
Node node = bas.getLast();
node.getByteArray().free();
bas.removeLast();
}
}
/**
* {@inheritDoc}
*/
@Override
public Iterable getIoBuffers() {
if (bas.isEmpty()) {
return Collections.emptyList();
}
Collection result = new ArrayList<>();
Node node = bas.getFirst();
for (IoBuffer bb : node.getByteArray().getIoBuffers()) {
result.add(bb);
}
while (node.hasNextNode()) {
node = node.getNextNode();
for (IoBuffer bb : node.getByteArray().getIoBuffers()) {
result.add(bb);
}
}
return result;
}
/**
* {@inheritDoc}
*/
@Override
public IoBuffer getSingleIoBuffer() {
if (byteArrayFactory == null) {
throw new IllegalStateException(
"Can't get single buffer from CompositeByteArray unless it has a ByteArrayFactory.");
}
if (bas.isEmpty()) {
ByteArray ba = byteArrayFactory.create(1);
return ba.getSingleIoBuffer();
}
int actualLength = last() - first();
Node firstNode = bas.getFirst();
ByteArray ba = firstNode.getByteArray();
if (ba.last() == actualLength) {
return ba.getSingleIoBuffer();
}
// Replace all nodes with a single node.
ByteArray target = byteArrayFactory.create(actualLength);
IoBuffer bb = target.getSingleIoBuffer();
Cursor cursor = cursor();
cursor.put(bb); // Copy all existing data into target IoBuffer.
while (!bas.isEmpty()) {
Node node = bas.getLast();
ByteArray component = node.getByteArray();
bas.removeLast();
component.free();
}
bas.addLast(target);
return bb;
}
/**
* {@inheritDoc}
*/
@Override
public Cursor cursor() {
return new CursorImpl();
}
/**
* {@inheritDoc}
*/
@Override
public Cursor cursor(int index) {
return new CursorImpl(index);
}
/**
* Get a cursor starting at index 0 (which may not be the start of the
* array) and with the given listener.
*
* @param listener The listener to use
* @return a new {@link ByteArray.Cursor} instance
*/
public Cursor cursor(CursorListener listener) {
return new CursorImpl(listener);
}
/**
* Get a cursor starting at the given index and with the given listener.
*
* @param index The position of the array to start the Cursor at
* @param listener The listener for the Cursor that is returned
* @return The created Cursor
*/
public Cursor cursor(int index, CursorListener listener) {
return new CursorImpl(index, listener);
}
/**
* {@inheritDoc}
*/
@Override
public ByteArray slice(int index, int length) {
return cursor(index).slice(length);
}
/**
* {@inheritDoc}
*/
@Override
public byte get(int index) {
return cursor(index).get();
}
/**
* {@inheritDoc}
*/
@Override
public void put(int index, byte b) {
cursor(index).put(b);
}
/**
* {@inheritDoc}
*/
@Override
public void get(int index, IoBuffer bb) {
cursor(index).get(bb);
}
/**
* {@inheritDoc}
*/
@Override
public void put(int index, IoBuffer bb) {
cursor(index).put(bb);
}
/**
* {@inheritDoc}
*/
@Override
public int first() {
return bas.firstByte();
}
/**
* {@inheritDoc}
*/
@Override
public int last() {
return bas.lastByte();
}
/**
* This method should be called prior to adding any component
* ByteArray to a composite.
*
* @param ba The component to add.
*/
private void addHook(ByteArray ba) {
// Check first() is zero, otherwise cursor might not work.
// TODO: Remove this restriction?
if (ba.first() != 0) {
throw new IllegalArgumentException("Cannot add byte array that doesn't start from 0: " + ba.first());
}
// Check order.
if (order == null) {
order = ba.order();
} else if (!order.equals(ba.order())) {
throw new IllegalArgumentException("Cannot add byte array with different byte order: " + ba.order());
}
}
/**
* {@inheritDoc}
*/
@Override
public ByteOrder order() {
if (order == null) {
throw new IllegalStateException("Byte order not yet set.");
}
return order;
}
/**
* {@inheritDoc}
*/
@Override
public void order(ByteOrder order) {
if (order == null || !order.equals(this.order)) {
this.order = order;
if (!bas.isEmpty()) {
for (Node node = bas.getFirst(); node.hasNextNode(); node = node.getNextNode()) {
node.getByteArray().order(order);
}
}
}
}
/**
* {@inheritDoc}
*/
@Override
public short getShort(int index) {
return cursor(index).getShort();
}
/**
* {@inheritDoc}
*/
@Override
public void putShort(int index, short s) {
cursor(index).putShort(s);
}
/**
* {@inheritDoc}
*/
@Override
public int getInt(int index) {
return cursor(index).getInt();
}
/**
* {@inheritDoc}
*/
@Override
public void putInt(int index, int i) {
cursor(index).putInt(i);
}
/**
* {@inheritDoc}
*/
@Override
public long getLong(int index) {
return cursor(index).getLong();
}
/**
* {@inheritDoc}
*/
@Override
public void putLong(int index, long l) {
cursor(index).putLong(l);
}
/**
* {@inheritDoc}
*/
@Override
public float getFloat(int index) {
return cursor(index).getFloat();
}
/**
* {@inheritDoc}
*/
@Override
public void putFloat(int index, float f) {
cursor(index).putFloat(f);
}
/**
* {@inheritDoc}
*/
@Override
public double getDouble(int index) {
return cursor(index).getDouble();
}
/**
* {@inheritDoc}
*/
@Override
public void putDouble(int index, double d) {
cursor(index).putDouble(d);
}
/**
* {@inheritDoc}
*/
@Override
public char getChar(int index) {
return cursor(index).getChar();
}
/**
* {@inheritDoc}
*/
@Override
public void putChar(int index, char c) {
cursor(index).putChar(c);
}
private class CursorImpl implements Cursor {
private int index;
private final CursorListener listener;
private Node componentNode;
// Index of start of current component.
private int componentIndex;
// Cursor within current component.
private ByteArray.Cursor componentCursor;
public CursorImpl() {
this(0, null);
}
public CursorImpl(int index) {
this(index, null);
}
public CursorImpl(CursorListener listener) {
this(0, listener);
}
public CursorImpl(int index, CursorListener listener) {
this.index = index;
this.listener = listener;
}
/**
* {@inheritDoc}
*/
@Override
public int getIndex() {
return index;
}
/**
* {@inheritDoc}
*/
@Override
public void setIndex(int index) {
checkBounds(index, 0);
this.index = index;
}
/**
* {@inheritDoc}
*/
@Override
public void skip(int length) {
setIndex(index + length);
}
/**
* {@inheritDoc}
*/
@Override
public ByteArray slice(int length) {
CompositeByteArray slice = new CompositeByteArray(byteArrayFactory);
int remaining = length;
while (remaining > 0) {
prepareForAccess(remaining);
int componentSliceSize = Math.min(remaining, componentCursor.getRemaining());
ByteArray componentSlice = componentCursor.slice(componentSliceSize);
slice.addLast(componentSlice);
index += componentSliceSize;
remaining -= componentSliceSize;
}
return slice;
}
/**
* {@inheritDoc}
*/
@Override
public ByteOrder order() {
return CompositeByteArray.this.order();
}
private void prepareForAccess(int accessSize) {
// Handle removed node. Do this first so we can remove the reference
// even if bounds checking fails.
if (componentNode != null && componentNode.isRemoved()) {
componentNode = null;
componentCursor = null;
}
// Bounds checks
checkBounds(index, accessSize);
// Remember the current node so we can later tell whether or not we
// need to create a new cursor.
Node oldComponentNode = componentNode;
// Handle missing node.
if (componentNode == null) {
int basMidpoint = (last() - first()) / 2 + first();
if (index <= basMidpoint) {
// Search from the start.
componentNode = bas.getFirst();
componentIndex = first();
if (listener != null) {
listener.enteredFirstComponent(componentIndex, componentNode.getByteArray());
}
} else {
// Search from the end.
componentNode = bas.getLast();
componentIndex = last() - componentNode.getByteArray().last();
if (listener != null) {
listener.enteredLastComponent(componentIndex, componentNode.getByteArray());
}
}
}
// Go back, if necessary.
while (index < componentIndex) {
componentNode = componentNode.getPreviousNode();
componentIndex -= componentNode.getByteArray().last();
if (listener != null) {
listener.enteredPreviousComponent(componentIndex, componentNode.getByteArray());
}
}
// Go forward, if necessary.
while (index >= componentIndex + componentNode.getByteArray().length()) {
componentIndex += componentNode.getByteArray().last();
componentNode = componentNode.getNextNode();
if (listener != null) {
listener.enteredNextComponent(componentIndex, componentNode.getByteArray());
}
}
// Update the cursor.
int internalComponentIndex = index - componentIndex;
if (componentNode == oldComponentNode) {
// Move existing cursor.
componentCursor.setIndex(internalComponentIndex);
} else {
// Create new cursor.
componentCursor = componentNode.getByteArray().cursor(internalComponentIndex);
}
}
/**
* {@inheritDoc}
*/
@Override
public int getRemaining() {
return last() - index + 1;
}
/**
* {@inheritDoc}
*/
@Override
public boolean hasRemaining() {
return getRemaining() > 0;
}
/**
* {@inheritDoc}
*/
@Override
public byte get() {
prepareForAccess(1);
byte b = componentCursor.get();
index += 1;
return b;
}
/**
* {@inheritDoc}
*/
@Override
public void put(byte b) {
prepareForAccess(1);
componentCursor.put(b);
index += 1;
}
/**
* {@inheritDoc}
*/
@Override
public void get(IoBuffer bb) {
while (bb.hasRemaining()) {
int remainingBefore = bb.remaining();
prepareForAccess(remainingBefore);
componentCursor.get(bb);
int remainingAfter = bb.remaining();
// Advance index by actual amount got.
int chunkSize = remainingBefore - remainingAfter;
index += chunkSize;
}
}
/**
* {@inheritDoc}
*/
@Override
public void put(IoBuffer bb) {
while (bb.hasRemaining()) {
int remainingBefore = bb.remaining();
prepareForAccess(remainingBefore);
componentCursor.put(bb);
int remainingAfter = bb.remaining();
// Advance index by actual amount put.
int chunkSize = remainingBefore - remainingAfter;
index += chunkSize;
}
}
/**
* {@inheritDoc}
*/
@Override
public short getShort() {
prepareForAccess(2);
if (componentCursor.getRemaining() >= 4) {
short s = componentCursor.getShort();
index += 2;
return s;
} else {
byte b0 = get();
byte b1 = get();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return (short) ((b0 << 8) | (b1 & 0xFF));
} else {
return (short) ((b1 << 8) | (b0 & 0xFF));
}
}
}
/**
* {@inheritDoc}
*/
@Override
public void putShort(short s) {
prepareForAccess(2);
if (componentCursor.getRemaining() >= 4) {
componentCursor.putShort(s);
index += 2;
} else {
if (order.equals(ByteOrder.BIG_ENDIAN)) {
put((byte) ((s >> 8) & 0xff));
put((byte) (s & 0xff));
} else {
put((byte) (s & 0xff));
put((byte) ((s >> 8) & 0xff));
}
}
}
/**
* {@inheritDoc}
*/
@Override
public int getInt() {
prepareForAccess(4);
if (componentCursor.getRemaining() >= 4) {
int i = componentCursor.getInt();
index += 4;
return i;
} else {
byte b0 = get();
byte b1 = get();
byte b2 = get();
byte b3 = get();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return (b0 << 24) | ((b1 & 0xFF) << 16) | ((b2 & 0xFF) << 8) | (b3 & 0xFF);
} else {
return (b3 << 24) | ((b2 & 0xFF) << 16) | ((b1 & 0xFF) << 8) | (b0 & 0xFF);
}
}
}
/**
* {@inheritDoc}
*/
@Override
public void putInt(int i) {
prepareForAccess(4);
if (componentCursor.getRemaining() >= 4) {
componentCursor.putInt(i);
index += 4;
} else {
if (order.equals(ByteOrder.BIG_ENDIAN)) {
put((byte) ((i >> 24) & 0xff));
put((byte) ((i >> 16) & 0xff));
put((byte) ((i >> 8) & 0xff));
put((byte) (i & 0xff));
} else {
put((byte) (i & 0xff));
put((byte) ((i >> 8) & 0xff));
put((byte) ((i >> 16) & 0xff));
put((byte) ((i >> 24) & 0xff));
}
}
}
/**
* {@inheritDoc}
*/
@Override
public long getLong() {
prepareForAccess(8);
if (componentCursor.getRemaining() >= 4) {
long l = componentCursor.getLong();
index += 8;
return l;
} else {
byte b0 = get();
byte b1 = get();
byte b2 = get();
byte b3 = get();
byte b4 = get();
byte b5 = get();
byte b6 = get();
byte b7 = get();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return ((b0 & 0xFFL) << 56) | ((b1 & 0xFFL) << 48) | ((b2 & 0xFFL) << 40) | ((b3 & 0xFFL) << 32)
| ((b4 & 0xFFL) << 24) | ((b5 & 0xFFL) << 16) | ((b6 & 0xFFL) << 8) | (b7 & 0xFFL);
} else {
return ((b7 & 0xFFL) << 56) | ((b6 & 0xFFL) << 48) | ((b5 & 0xFFL) << 40) | ((b4 & 0xFFL) << 32)
| ((b3 & 0xFFL) << 24) | ((b2 & 0xFFL) << 16) | ((b1 & 0xFFL) << 8) | (b0 & 0xFFL);
}
}
}
/**
* {@inheritDoc}
*/
@Override
public void putLong(long l) {
prepareForAccess(8);
if (componentCursor.getRemaining() >= 4) {
componentCursor.putLong(l);
index += 8;
} else {
if (order.equals(ByteOrder.BIG_ENDIAN)) {
put((byte) ((l >> 56) & 0xff));
put((byte) ((l >> 48) & 0xff));
put((byte) ((l >> 40) & 0xff));
put((byte) ((l >> 32) & 0xff));
put((byte) ((l >> 24) & 0xff));
put((byte) ((l >> 16) & 0xff));
put((byte) ((l >> 8) & 0xff));
put((byte) (l & 0xff));
} else {
put((byte) (l & 0xff));
put((byte) ((l >> 8) & 0xff));
put((byte) ((l >> 16) & 0xff));
put((byte) ((l >> 24) & 0xff));
put((byte) ((l >> 32) & 0xff));
put((byte) ((l >> 40) & 0xff));
put((byte) ((l >> 48) & 0xff));
put((byte) ((l >> 56) & 0xff));
}
}
}
/**
* {@inheritDoc}
*/
@Override
public float getFloat() {
prepareForAccess(4);
if (componentCursor.getRemaining() >= 4) {
float f = componentCursor.getFloat();
index += 4;
return f;
} else {
int i = getInt();
return Float.intBitsToFloat(i);
}
}
/**
* {@inheritDoc}
*/
@Override
public void putFloat(float f) {
prepareForAccess(4);
if (componentCursor.getRemaining() >= 4) {
componentCursor.putFloat(f);
index += 4;
} else {
int i = Float.floatToIntBits(f);
putInt(i);
}
}
/**
* {@inheritDoc}
*/
@Override
public double getDouble() {
prepareForAccess(8);
if (componentCursor.getRemaining() >= 4) {
double d = componentCursor.getDouble();
index += 8;
return d;
} else {
long l = getLong();
return Double.longBitsToDouble(l);
}
}
/**
* {@inheritDoc}
*/
@Override
public void putDouble(double d) {
prepareForAccess(8);
if (componentCursor.getRemaining() >= 4) {
componentCursor.putDouble(d);
index += 8;
} else {
long l = Double.doubleToLongBits(d);
putLong(l);
}
}
/**
* {@inheritDoc}
*/
@Override
public char getChar() {
prepareForAccess(2);
if (componentCursor.getRemaining() >= 4) {
char c = componentCursor.getChar();
index += 2;
return c;
} else {
byte b0 = get();
byte b1 = get();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return (char)((b0 << 8) | (b1 & 0xFF));
} else {
return (char)((b1 << 8) | (b0 & 0xFF));
}
}
}
/**
* {@inheritDoc}
*/
@Override
public void putChar(char c) {
prepareForAccess(2);
if (componentCursor.getRemaining() >= 4) {
componentCursor.putChar(c);
index += 2;
} else {
byte b0;
byte b1;
if (order.equals(ByteOrder.BIG_ENDIAN)) {
b0 = (byte) ((c >> 8) & 0xff);
b1 = (byte) (c & 0xff);
} else {
b0 = (byte) (c & 0xff);
b1 = (byte) ((c >> 8) & 0xff);
}
put(b0);
put(b1);
}
}
private void checkBounds(int index, int accessSize) {
int lower = index;
int upper = index + accessSize;
if (lower < first()) {
throw new IndexOutOfBoundsException("Index " + lower + " less than start " + first() + ".");
}
if (upper > last()) {
throw new IndexOutOfBoundsException("Index " + upper + " greater than length " + last() + ".");
}
}
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
int h = 17;
h = h*37 + bas.hashCode();
return h;
}
}
