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Apache Commons Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
/*
* 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.commons.lang3.util;
import java.io.Serializable;
import java.util.BitSet;
import java.util.Objects;
import java.util.stream.IntStream;
/**
* A fluent {@link BitSet} with additional operations.
*
* Originally from Apache Commons VFS with more added to act as a fluent replacement for {@link java.util.BitSet}.
*
* @since 3.13.0
*/
public final class FluentBitSet implements Cloneable, Serializable {
private static final long serialVersionUID = 1L;
/**
* Working BitSet.
*/
private final BitSet bitSet;
/**
* Creates a new bit set. All bits are initially {@code false}.
*/
public FluentBitSet() {
this(new BitSet());
}
/**
* Creates a new instance for the given bit set.
*
* @param set The bit set to wrap.
*/
public FluentBitSet(final BitSet set) {
this.bitSet = Objects.requireNonNull(set, "set");
}
/**
* Creates a bit set whose initial size is large enough to explicitly represent bits with indices in the range {@code 0}
* through {@code nbits-1}. All bits are initially {@code false}.
*
* @param nbits the initial size of the bit set.
* @throws NegativeArraySizeException if the specified initial size is negative.
*/
public FluentBitSet(final int nbits) {
this(new BitSet(nbits));
}
/**
* Performs a logical AND of this target bit set with the argument bit set. This bit set is modified so that each
* bit in it has the value {@code true} if and only if it both initially had the value {@code true} and the
* corresponding bit in the bit set argument also had the value {@code true}.
*
* @param set a bit set.
* @return this.
*/
public FluentBitSet and(final BitSet set) {
bitSet.and(set);
return this;
}
/**
* Performs a logical AND of this target bit set with the argument bit set. This bit set is modified so that each
* bit in it has the value {@code true} if and only if it both initially had the value {@code true} and the
* corresponding bit in the bit set argument also had the value {@code true}.
*
* @param set a bit set.
* @return this.
*/
public FluentBitSet and(final FluentBitSet set) {
bitSet.and(set.bitSet);
return this;
}
/**
* Clears all of the bits in this {@link BitSet} whose corresponding bit is set in the specified {@link BitSet}.
*
* @param set the {@link BitSet} with which to mask this {@link BitSet}.
* @return this.
*/
public FluentBitSet andNot(final BitSet set) {
bitSet.andNot(set);
return this;
}
/**
* Clears all of the bits in this {@link BitSet} whose corresponding bit is set in the specified {@link BitSet}.
*
* @param set the {@link BitSet} with which to mask this {@link BitSet}.
* @return this.
*/
public FluentBitSet andNot(final FluentBitSet set) {
this.bitSet.andNot(set.bitSet);
return this;
}
/**
* Gets the wrapped bit set.
*
* @return the wrapped bit set.
*/
public BitSet bitSet() {
return bitSet;
}
/**
* Returns the number of bits set to {@code true} in this {@link BitSet}.
*
* @return the number of bits set to {@code true} in this {@link BitSet}.
*/
public int cardinality() {
return bitSet.cardinality();
}
/**
* Sets all of the bits in this BitSet to {@code false}.
*
* @return this.
*/
public FluentBitSet clear() {
bitSet.clear();
return this;
}
/**
* Sets the bits specified by the indexes to {@code false}.
*
* @param bitIndexArray the index of the bit to be cleared.
* @throws IndexOutOfBoundsException if the specified index is negative.
* @return this.
*/
public FluentBitSet clear(final int... bitIndexArray) {
for (final int e : bitIndexArray) {
this.bitSet.clear(e);
}
return this;
}
/**
* Sets the bit specified by the index to {@code false}.
*
* @param bitIndex the index of the bit to be cleared.
* @throws IndexOutOfBoundsException if the specified index is negative.
* @return this.
*/
public FluentBitSet clear(final int bitIndex) {
bitSet.clear(bitIndex);
return this;
}
/**
* Sets the bits from the specified {@code fromIndex} (inclusive) to the specified {@code toIndex} (exclusive) to
* {@code false}.
*
* @param fromIndex index of the first bit to be cleared.
* @param toIndex index after the last bit to be cleared.
* @throws IndexOutOfBoundsException if {@code fromIndex} is negative, or {@code toIndex} is negative, or
* {@code fromIndex} is larger than {@code toIndex}.
* @return this.
*/
public FluentBitSet clear(final int fromIndex, final int toIndex) {
bitSet.clear(fromIndex, toIndex);
return this;
}
/**
* Cloning this {@link BitSet} produces a new {@link BitSet} that is equal to it. The clone of the bit set is another
* bit set that has exactly the same bits set to {@code true} as this bit set.
*
* @return a clone of this bit set
* @see #size()
*/
@Override
public Object clone() {
return new FluentBitSet((BitSet) bitSet.clone());
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof FluentBitSet)) {
return false;
}
final FluentBitSet other = (FluentBitSet) obj;
return Objects.equals(bitSet, other.bitSet);
}
/**
* Sets the bit at the specified index to the complement of its current value.
*
* @param bitIndex the index of the bit to flip.
* @throws IndexOutOfBoundsException if the specified index is negative.
* @return this.
*/
public FluentBitSet flip(final int bitIndex) {
bitSet.flip(bitIndex);
return this;
}
/**
* Sets each bit from the specified {@code fromIndex} (inclusive) to the specified {@code toIndex} (exclusive) to the
* complement of its current value.
*
* @param fromIndex index of the first bit to flip.
* @param toIndex index after the last bit to flip.
* @throws IndexOutOfBoundsException if {@code fromIndex} is negative, or {@code toIndex} is negative, or
* {@code fromIndex} is larger than {@code toIndex}.
* @return this.
*/
public FluentBitSet flip(final int fromIndex, final int toIndex) {
bitSet.flip(fromIndex, toIndex);
return this;
}
/**
* Returns the value of the bit with the specified index. The value is {@code true} if the bit with the index
* {@code bitIndex} is currently set in this {@link BitSet}; otherwise, the result is {@code false}.
*
* @param bitIndex the bit index.
* @return the value of the bit with the specified index.
* @throws IndexOutOfBoundsException if the specified index is negative.
*/
public boolean get(final int bitIndex) {
return bitSet.get(bitIndex);
}
/**
* Returns a new {@link BitSet} composed of bits from this {@link BitSet} from {@code fromIndex} (inclusive) to
* {@code toIndex} (exclusive).
*
* @param fromIndex index of the first bit to include.
* @param toIndex index after the last bit to include.
* @return a new {@link BitSet} from a range of this {@link BitSet}.
* @throws IndexOutOfBoundsException if {@code fromIndex} is negative, or {@code toIndex} is negative, or
* {@code fromIndex} is larger than {@code toIndex}.
*/
public FluentBitSet get(final int fromIndex, final int toIndex) {
return new FluentBitSet(bitSet.get(fromIndex, toIndex));
}
@Override
public int hashCode() {
return bitSet.hashCode();
}
/**
* Returns true if the specified {@link BitSet} has any bits set to {@code true} that are also set to {@code true} in
* this {@link BitSet}.
*
* @param set {@link BitSet} to intersect with.
* @return boolean indicating whether this {@link BitSet} intersects the specified {@link BitSet}.
*/
public boolean intersects(final BitSet set) {
return bitSet.intersects(set);
}
/**
* Returns true if the specified {@link BitSet} has any bits set to {@code true} that are also set to {@code true} in
* this {@link BitSet}.
*
* @param set {@link BitSet} to intersect with.
* @return boolean indicating whether this {@link BitSet} intersects the specified {@link BitSet}.
*/
public boolean intersects(final FluentBitSet set) {
return bitSet.intersects(set.bitSet);
}
/**
* Returns true if this {@link BitSet} contains no bits that are set to {@code true}.
*
* @return boolean indicating whether this {@link BitSet} is empty.
*/
public boolean isEmpty() {
return bitSet.isEmpty();
}
/**
* Returns the "logical size" of this {@link BitSet}: the index of the highest set bit in the {@link BitSet} plus one.
* Returns zero if the {@link BitSet} contains no set bits.
*
* @return the logical size of this {@link BitSet}.
*/
public int length() {
return bitSet.length();
}
/**
* Returns the index of the first bit that is set to {@code false} that occurs on or after the specified starting index.
*
* @param fromIndex the index to start checking from (inclusive).
* @return the index of the next clear bit.
* @throws IndexOutOfBoundsException if the specified index is negative.
*/
public int nextClearBit(final int fromIndex) {
return bitSet.nextClearBit(fromIndex);
}
/**
* Returns the index of the first bit that is set to {@code true} that occurs on or after the specified starting index.
* If no such bit exists then {@code -1} is returned.
*
* To iterate over the {@code true} bits in a {@link BitSet}, use the following loop:
*
*
*
* {@code
* for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i+1)) {
* // operate on index i here
* if (i == Integer.MAX_VALUE) {
* break; // or (i+1) would overflow
* }
* }}
*
*
* @param fromIndex the index to start checking from (inclusive).
* @return the index of the next set bit, or {@code -1} if there is no such bit.
* @throws IndexOutOfBoundsException if the specified index is negative.
*/
public int nextSetBit(final int fromIndex) {
return bitSet.nextSetBit(fromIndex);
}
/**
* Performs a logical OR of this bit set with the bit set argument. This bit set is modified so that a bit in it
* has the value {@code true} if and only if it either already had the value {@code true} or the corresponding bit in
* the bit set argument has the value {@code true}.
*
* @param set a bit set.
* @return this.
*/
public FluentBitSet or(final BitSet set) {
bitSet.or(set);
return this;
}
/**
* Performs a logical OR of this bit set with the bit set arguments. This bit set is modified so that a bit in it
* has the value {@code true} if and only if it either already had the value {@code true} or the corresponding bit in
* the bit set argument has the value {@code true}.
*
* @param set a bit set.
* @return this.
*/
public FluentBitSet or(final FluentBitSet... set) {
for (final FluentBitSet e : set) {
this.bitSet.or(e.bitSet);
}
return this;
}
/**
* Performs a logical OR of this bit set with the bit set argument. This bit set is modified so that a bit in it
* has the value {@code true} if and only if it either already had the value {@code true} or the corresponding bit in
* the bit set argument has the value {@code true}.
*
* @param set a bit set.
* @return this.
*/
public FluentBitSet or(final FluentBitSet set) {
this.bitSet.or(set.bitSet);
return this;
}
/**
* Returns the index of the nearest bit that is set to {@code false} that occurs on or before the specified starting
* index. If no such bit exists, or if {@code -1} is given as the starting index, then {@code -1} is returned.
*
* @param fromIndex the index to start checking from (inclusive).
* @return the index of the previous clear bit, or {@code -1} if there is no such bit.
* @throws IndexOutOfBoundsException if the specified index is less than {@code -1}.
*/
public int previousClearBit(final int fromIndex) {
return bitSet.previousClearBit(fromIndex);
}
/**
* Returns the index of the nearest bit that is set to {@code true} that occurs on or before the specified starting
* index. If no such bit exists, or if {@code -1} is given as the starting index, then {@code -1} is returned.
*
*
* To iterate over the {@code true} bits in a {@link BitSet}, use the following loop:
*
*
* {@code
* for (int i = bs.length(); (i = bs.previousSetBit(i-1)) >= 0; ) {
* // operate on index i here
* }}
*
*
* @param fromIndex the index to start checking from (inclusive)
* @return the index of the previous set bit, or {@code -1} if there is no such bit
* @throws IndexOutOfBoundsException if the specified index is less than {@code -1}
*/
public int previousSetBit(final int fromIndex) {
return bitSet.previousSetBit(fromIndex);
}
/**
* Sets the bit at the specified indexes to {@code true}.
*
* @param bitIndexArray a bit index array.
* @throws IndexOutOfBoundsException if the specified index is negative.
* @return this.
*/
public FluentBitSet set(final int... bitIndexArray) {
for (final int e : bitIndexArray) {
bitSet.set(e);
}
return this;
}
/**
* Sets the bit at the specified index to {@code true}.
*
* @param bitIndex a bit index
* @throws IndexOutOfBoundsException if the specified index is negative
* @return this.
*/
public FluentBitSet set(final int bitIndex) {
bitSet.set(bitIndex);
return this;
}
/**
* Sets the bit at the specified index to the specified value.
*
* @param bitIndex a bit index.
* @param value a boolean value to set.
* @throws IndexOutOfBoundsException if the specified index is negative.
* @return this.
*/
public FluentBitSet set(final int bitIndex, final boolean value) {
bitSet.set(bitIndex, value);
return this;
}
/**
* Sets the bits from the specified {@code fromIndex} (inclusive) to the specified {@code toIndex} (exclusive) to
* {@code true}.
*
* @param fromIndex index of the first bit to be set.
* @param toIndex index after the last bit to be set.
* @throws IndexOutOfBoundsException if {@code fromIndex} is negative, or {@code toIndex} is negative, or
* {@code fromIndex} is larger than {@code toIndex}.
* @return this.
*/
public FluentBitSet set(final int fromIndex, final int toIndex) {
bitSet.set(fromIndex, toIndex);
return this;
}
/**
* Sets the bits from the specified {@code fromIndex} (inclusive) to the specified {@code toIndex} (exclusive) to the
* specified value.
*
* @param fromIndex index of the first bit to be set.
* @param toIndex index after the last bit to be set.
* @param value value to set the selected bits to.
* @throws IndexOutOfBoundsException if {@code fromIndex} is negative, or {@code toIndex} is negative, or
* {@code fromIndex} is larger than {@code toIndex}.
* @return this.
*/
public FluentBitSet set(final int fromIndex, final int toIndex, final boolean value) {
bitSet.set(fromIndex, toIndex, value);
return this;
}
/**
* Sets the bits from the specified {@code fromIndex} (inclusive) to the specified {@code toIndex} (exclusive) to
* {@code true}.
*
* @param fromIndex index of the first bit to be set
* @param toIndex index of the last bit to be set
* @throws IndexOutOfBoundsException if {@code fromIndex} is negative, or {@code toIndex} is negative, or
* {@code fromIndex} is larger than {@code toIndex}
* @return this.
*/
public FluentBitSet setInclusive(final int fromIndex, final int toIndex) {
bitSet.set(fromIndex, toIndex + 1);
return this;
}
/**
* Returns the number of bits of space actually in use by this {@link BitSet} to represent bit values. The maximum
* element in the set is the size - 1st element.
*
* @return the number of bits currently in this bit set.
*/
public int size() {
return bitSet.size();
}
/**
* Returns a stream of indices for which this {@link BitSet} contains a bit in the set state. The indices are returned
* in order, from lowest to highest. The size of the stream is the number of bits in the set state, equal to the value
* returned by the {@link #cardinality()} method.
*
*
* The bit set must remain constant during the execution of the terminal stream operation. Otherwise, the result of the
* terminal stream operation is undefined.
*
*
* @return a stream of integers representing set indices.
* @since 1.8
*/
public IntStream stream() {
return bitSet.stream();
}
/**
* Returns a new byte array containing all the bits in this bit set.
*
*
* More precisely, if:
*
*
* - {@code byte[] bytes = s.toByteArray();}
* - then {@code bytes.length == (s.length()+7)/8} and
* - {@code s.get(n) == ((bytes[n/8] & (1<<(n%8))) != 0)}
* - for all {@code n < 8 * bytes.length}.
*
*
* @return a byte array containing a little-endian representation of all the bits in this bit set
*/
public byte[] toByteArray() {
return bitSet.toByteArray();
}
/**
* Returns a new byte array containing all the bits in this bit set.
*
*
* More precisely, if:
*
*
* - {@code long[] longs = s.toLongArray();}
* - then {@code longs.length == (s.length()+63)/64} and
* - {@code s.get(n) == ((longs[n/64] & (1L<<(n%64))) != 0)}
* - for all {@code n < 64 * longs.length}.
*
*
* @return a byte array containing a little-endian representation of all the bits in this bit set
*/
public long[] toLongArray() {
return bitSet.toLongArray();
}
@Override
public String toString() {
return bitSet.toString();
}
/**
* Performs a logical XOR of this bit set with the bit set argument. This bit set is modified so that a bit in it
* has the value {@code true} if and only if one of the following statements holds:
*
* - The bit initially has the value {@code true}, and the corresponding bit in the argument has the value
* {@code false}.
*
- The bit initially has the value {@code false}, and the corresponding bit in the argument has the value
* {@code true}.
*
*
* @param set a bit set
* @return this.
*/
public FluentBitSet xor(final BitSet set) {
bitSet.xor(set);
return this;
}
/**
* Performs a logical XOR of this bit set with the bit set argument. This bit set is modified so that a bit in it
* has the value {@code true} if and only if one of the following statements holds:
*
* - The bit initially has the value {@code true}, and the corresponding bit in the argument has the value
* {@code false}.
*
- The bit initially has the value {@code false}, and the corresponding bit in the argument has the value
* {@code true}.
*
*
* @param set a bit set
* @return this.
*/
public FluentBitSet xor(final FluentBitSet set) {
bitSet.xor(set.bitSet);
return this;
}
}