it.unimi.dsi.fastutil.bytes.ByteBigArrayBigList Maven / Gradle / Ivy
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/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*
* Copyright (C) 2002-2016 Sebastiano Vigna
*
* Licensed 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 it.unimi.dsi.fastutil.bytes;
import java.util.Collection;
import java.util.Iterator;
import java.util.RandomAccess;
import java.util.NoSuchElementException;
import it.unimi.dsi.fastutil.BigArrays;
/**
* A type-specific big list based on a big array; provides some additional
* methods that use polymorphism to avoid (un)boxing.
*
*
* This class implements a lightweight, fast, open, optimized, reuse-oriented
* version of big-array-based big lists. Instances of this class represent a big
* list with a big array that is enlarged as needed when new entries are created
* (by doubling the current length), but is never made smaller (even on
* a {@link #clear()}). A family of {@linkplain #trim() trimming methods} lets
* you control the size of the backing big array; this is particularly useful if
* you reuse instances of this class. Range checks are equivalent to those of
* {@link java.util}'s classes, but they are delayed as much as possible. The
* backing big array is exposed by the {@link #elements()} method.
*
*
* This class implements the bulk methods removeElements(),
* addElements() and getElements() using
* high-performance system calls (e.g.,
* {@link System#arraycopy(Object,int,Object,int,int) System.arraycopy()} instead
* of expensive loops.
*
* @see java.util.ArrayList
*/
public class ByteBigArrayBigList extends AbstractByteBigList
implements
RandomAccess,
Cloneable,
java.io.Serializable {
private static final long serialVersionUID = -7046029254386353130L;
/** The initial default capacity of a big-array big list. */
public final static int DEFAULT_INITIAL_CAPACITY = 16;
/** The backing big array. */
protected transient byte a[][];
/**
* The current actual size of the big list (never greater than the
* backing-array length).
*/
protected long size;
private static final boolean ASSERTS = false;
/**
* Creates a new big-array big list using a given array.
*
*
* This constructor is only meant to be used by the wrapping methods.
*
* @param a
* the big array that will be used to back this big-array big
* list.
*/
@SuppressWarnings("unused")
protected ByteBigArrayBigList(final byte a[][], boolean dummy) {
this.a = a;
}
/**
* Creates a new big-array big list with given capacity.
*
* @param capacity
* the initial capacity of the array list (may be 0).
*/
public ByteBigArrayBigList(final long capacity) {
if (capacity < 0)
throw new IllegalArgumentException("Initial capacity (" + capacity
+ ") is negative");
a = ByteBigArrays.newBigArray(capacity);
}
/**
* Creates a new big-array big list with {@link #DEFAULT_INITIAL_CAPACITY}
* capacity.
*/
public ByteBigArrayBigList() {
this(DEFAULT_INITIAL_CAPACITY);
}
/**
* Creates a new big-array big list and fills it with a given type-specific
* collection.
*
* @param c
* a type-specific collection that will be used to fill the array
* list.
*/
public ByteBigArrayBigList(final ByteCollection c) {
this(c.size());
for (ByteIterator i = c.iterator(); i.hasNext();)
add(i.nextByte());
}
/**
* Creates a new big-array big list and fills it with a given type-specific
* list.
*
* @param l
* a type-specific list that will be used to fill the array list.
*/
public ByteBigArrayBigList(final ByteBigList l) {
this(l.size64());
l.getElements(0, a, 0, size = l.size64());
}
/**
* Creates a new big-array big list and fills it with the elements of a
* given big array.
*
*
* Note that this constructor makes it easy to build big lists from literal
* arrays declared as
* type[][] {{ init_values }}. The only
* constraint is that the number of initialisation values is below
* {@link it.unimi.dsi.fastutil.BigArrays#SEGMENT_SIZE}.
*
* @param a
* a big array whose elements will be used to fill the array
* list.
*/
public ByteBigArrayBigList(final byte a[][]) {
this(a, 0, ByteBigArrays.length(a));
}
/**
* Creates a new big-array big list and fills it with the elements of a
* given big array.
*
*
* Note that this constructor makes it easy to build big lists from literal
* arrays declared as
* type[][] {{ init_values }}. The only
* constraint is that the number of initialisation values is below
* {@link it.unimi.dsi.fastutil.BigArrays#SEGMENT_SIZE}.
*
* @param a
* a big array whose elements will be used to fill the array
* list.
* @param offset
* the first element to use.
* @param length
* the number of elements to use.
*/
public ByteBigArrayBigList(final byte a[][], final long offset,
final long length) {
this(length);
ByteBigArrays.copy(a, offset, this.a, 0, length);
size = length;
}
/**
* Creates a new big-array big list and fills it with the elements returned
* by an iterator..
*
* @param i
* an iterator whose returned elements will fill the array list.
*/
public ByteBigArrayBigList(final Iterator i) {
this();
while (i.hasNext())
this.add(i.next());
}
/**
* Creates a new big-array big list and fills it with the elements returned
* by a type-specific iterator..
*
* @param i
* a type-specific iterator whose returned elements will fill the
* array list.
*/
public ByteBigArrayBigList(final ByteIterator i) {
this();
while (i.hasNext())
this.add(i.nextByte());
}
/**
* Returns the backing big array of this big list.
*
* @return the backing big array.
*/
public byte[][] elements() {
return a;
}
/**
* Wraps a given big array into a big-array list of given size.
*
* @param a
* a big array to wrap.
* @param length
* the length of the resulting big-array list.
* @return a new big-array list of the given size, wrapping the given big
* array.
*/
public static ByteBigArrayBigList wrap(final byte a[][], final long length) {
if (length > ByteBigArrays.length(a))
throw new IllegalArgumentException("The specified length ("
+ length + ") is greater than the array size ("
+ ByteBigArrays.length(a) + ")");
final ByteBigArrayBigList l = new ByteBigArrayBigList(a, false);
l.size = length;
return l;
}
/**
* Wraps a given big array into a big-array big list.
*
* @param a
* a big array to wrap.
* @return a new big-array big list wrapping the given array.
*/
public static ByteBigArrayBigList wrap(final byte a[][]) {
return wrap(a, ByteBigArrays.length(a));
}
/**
* Ensures that this big-array big list can contain the given number of
* entries without resizing.
*
* @param capacity
* the new minimum capacity for this big-array big list.
*/
public void ensureCapacity(final long capacity) {
a = ByteBigArrays.ensureCapacity(a, capacity, size);
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
}
/**
* Grows this big-array big list, ensuring that it can contain the given
* number of entries without resizing, and in case enlarging it at least by
* a factor of two.
*
* @param capacity
* the new minimum capacity for this big-array big list.
*/
private void grow(final long capacity) {
a = ByteBigArrays.grow(a, capacity, size);
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
}
public void add(final long index, final byte k) {
ensureIndex(index);
grow(size + 1);
if (index != size)
ByteBigArrays.copy(a, index, a, index + 1, size - index);
ByteBigArrays.set(a, index, k);
size++;
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
}
public boolean add(final byte k) {
grow(size + 1);
ByteBigArrays.set(a, size++, k);
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
return true;
}
public byte getByte(final long index) {
if (index >= size)
throw new IndexOutOfBoundsException("Index (" + index
+ ") is greater than or equal to list size (" + size + ")");
return ByteBigArrays.get(a, index);
}
public long indexOf(final byte k) {
for (long i = 0; i < size; i++)
if (((k) == (ByteBigArrays.get(a, i))))
return i;
return -1;
}
public long lastIndexOf(final byte k) {
for (long i = size; i-- != 0;)
if (((k) == (ByteBigArrays.get(a, i))))
return i;
return -1;
}
public byte removeByte(final long index) {
if (index >= size)
throw new IndexOutOfBoundsException("Index (" + index
+ ") is greater than or equal to list size (" + size + ")");
final byte old = ByteBigArrays.get(a, index);
size--;
if (index != size)
ByteBigArrays.copy(a, index + 1, a, index, size - index);
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
return old;
}
public boolean rem(final byte k) {
final long index = indexOf(k);
if (index == -1)
return false;
removeByte(index);
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
return true;
}
public byte set(final long index, final byte k) {
if (index >= size)
throw new IndexOutOfBoundsException("Index (" + index
+ ") is greater than or equal to list size (" + size + ")");
byte old = ByteBigArrays.get(a, index);
ByteBigArrays.set(a, index, k);
return old;
}
@Override
public boolean removeAll(final ByteCollection c) {
byte[] s = null, d = null;
int ss = -1, sd = BigArrays.SEGMENT_SIZE, ds = -1, dd = BigArrays.SEGMENT_SIZE;
for (long i = 0; i < size; i++) {
if (sd == BigArrays.SEGMENT_SIZE) {
sd = 0;
s = a[++ss];
}
if (!c.contains(s[sd])) {
if (dd == BigArrays.SEGMENT_SIZE) {
d = a[++ds];
dd = 0;
}
d[dd++] = s[sd];
}
sd++;
}
final long j = BigArrays.index(ds, dd);
final boolean modified = size != j;
size = j;
return modified;
}
@Override
public boolean removeAll(final Collection c) {
byte[] s = null, d = null;
int ss = -1, sd = BigArrays.SEGMENT_SIZE, ds = -1, dd = BigArrays.SEGMENT_SIZE;
for (long i = 0; i < size; i++) {
if (sd == BigArrays.SEGMENT_SIZE) {
sd = 0;
s = a[++ss];
}
if (!c.contains((Byte.valueOf(s[sd])))) {
if (dd == BigArrays.SEGMENT_SIZE) {
d = a[++ds];
dd = 0;
}
d[dd++] = s[sd];
}
sd++;
}
final long j = BigArrays.index(ds, dd);
final boolean modified = size != j;
size = j;
return modified;
}
public void clear() {
size = 0;
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
}
public long size64() {
return size;
}
public void size(final long size) {
if (size > ByteBigArrays.length(a))
ensureCapacity(size);
if (size > this.size)
ByteBigArrays.fill(a, this.size, size, ((byte) 0));
this.size = size;
}
public boolean isEmpty() {
return size == 0;
}
/**
* Trims this big-array big list so that the capacity is equal to the size.
*
* @see java.util.ArrayList#trimToSize()
*/
public void trim() {
trim(0);
}
/**
* Trims the backing big array if it is too large.
*
* If the current big array length is smaller than or equal to
* n, this method does nothing. Otherwise, it trims the
* big-array length to the maximum between n and
* {@link #size64()}.
*
*
* This method is useful when reusing big lists. {@linkplain #clear()
* Clearing a big list} leaves the big-array length untouched. If you are
* reusing a big list many times, you can call this method with a typical
* size to avoid keeping around a very large big array just because of a few
* large transient big lists.
*
* @param n
* the threshold for the trimming.
*/
public void trim(final long n) {
final long arrayLength = ByteBigArrays.length(a);
if (n >= arrayLength || size == arrayLength)
return;
a = ByteBigArrays.trim(a, Math.max(n, size));
if (ASSERTS)
assert size <= ByteBigArrays.length(a);
}
/**
* Copies element of this type-specific list into the given big array using
* optimized system calls.
*
* @param from
* the start index (inclusive).
* @param a
* the destination big array.
* @param offset
* the offset into the destination array where to store the first
* element copied.
* @param length
* the number of elements to be copied.
*/
public void getElements(final int from, final byte[][] a,
final long offset, final long length) {
ByteBigArrays.copy(this.a, from, a, offset, length);
}
/**
* Removes elements of this type-specific list using optimized system calls.
*
* @param from
* the start index (inclusive).
* @param to
* the end index (exclusive).
*/
public void removeElements(final int from, final int to) {
BigArrays.ensureFromTo(size, from, to);
ByteBigArrays.copy(a, to, a, from, size - to);
size -= (to - from);
}
/**
* Adds elements to this type-specific list using optimized system calls.
*
* @param index
* the index at which to add elements.
* @param a
* the big array containing the elements.
* @param offset
* the offset of the first element to add.
* @param length
* the number of elements to add.
*/
public void addElements(final int index, final byte a[][],
final long offset, final long length) {
ensureIndex(index);
ByteBigArrays.ensureOffsetLength(a, offset, length);
grow(size + length);
ByteBigArrays.copy(this.a, index, this.a, index + length, size - index);
ByteBigArrays.copy(a, offset, this.a, index, length);
size += length;
}
@Override
public ByteBigListIterator listIterator(final long index) {
ensureIndex(index);
return new AbstractByteBigListIterator() {
long pos = index, last = -1;
public boolean hasNext() {
return pos < size;
}
public boolean hasPrevious() {
return pos > 0;
}
public byte nextByte() {
if (!hasNext())
throw new NoSuchElementException();
return ByteBigArrays.get(a, last = pos++);
}
public byte previousByte() {
if (!hasPrevious())
throw new NoSuchElementException();
return ByteBigArrays.get(a, last = --pos);
}
public long nextIndex() {
return pos;
}
public long previousIndex() {
return pos - 1;
}
public void add(byte k) {
ByteBigArrayBigList.this.add(pos++, k);
last = -1;
}
public void set(byte k) {
if (last == -1)
throw new IllegalStateException();
ByteBigArrayBigList.this.set(last, k);
}
public void remove() {
if (last == -1)
throw new IllegalStateException();
ByteBigArrayBigList.this.removeByte(last);
/*
* If the last operation was a next(), we are removing an
* element *before* us, and we must decrease pos
* correspondingly.
*/
if (last < pos)
pos--;
last = -1;
}
};
}
public ByteBigArrayBigList clone() {
ByteBigArrayBigList c = new ByteBigArrayBigList(size);
ByteBigArrays.copy(a, 0, c.a, 0, size);
c.size = size;
return c;
}
/**
* Compares this type-specific big-array list to another one.
*
*
* This method exists only for sake of efficiency. The implementation
* inherited from the abstract implementation would already work.
*
* @param l
* a type-specific big-array list.
* @return true if the argument contains the same elements of this
* type-specific big-array list.
*/
public boolean equals(final ByteBigArrayBigList l) {
if (l == this)
return true;
long s = size64();
if (s != l.size64())
return false;
final byte[][] a1 = a;
final byte[][] a2 = l.a;
while (s-- != 0)
if (ByteBigArrays.get(a1, s) != ByteBigArrays.get(a2, s))
return false;
return true;
}
/**
* Compares this big list to another big list.
*
*
* This method exists only for sake of efficiency. The implementation
* inherited from the abstract implementation would already work.
*
* @param l
* a big list.
* @return a negative integer, zero, or a positive integer as this big list
* is lexicographically less than, equal to, or greater than the
* argument.
*/
public int compareTo(final ByteBigArrayBigList l) {
final long s1 = size64(), s2 = l.size64();
final byte a1[][] = a, a2[][] = l.a;
byte e1, e2;
int r, i;
for (i = 0; i < s1 && i < s2; i++) {
e1 = ByteBigArrays.get(a1, i);
e2 = ByteBigArrays.get(a2, i);
if ((r = (Byte.compare((e1), (e2)))) != 0)
return r;
}
return i < s2 ? -1 : (i < s1 ? 1 : 0);
}
private void writeObject(java.io.ObjectOutputStream s)
throws java.io.IOException {
s.defaultWriteObject();
for (int i = 0; i < size; i++)
s.writeByte(ByteBigArrays.get(a, i));
}
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException {
s.defaultReadObject();
a = ByteBigArrays.newBigArray(size);
for (int i = 0; i < size; i++)
ByteBigArrays.set(a, i, s.readByte());
}
}