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Show all versions of fastutil Show documentation
fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.
/*
* Copyright (C) 2004-2016 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.
*/
/** Loads elements from a given fast buffered reader, storing them in a given array fragment.
*
* @param reader a buffered reader.
* @param array an array which will be filled with data from reader.
* @param offset the index of the first element of array to be filled.
* @param length the number of elements of array to be filled.
* @return the number of elements actually read from reader (it might be less than length if reader ends).
*/
public static int LOAD_KEYS( final BufferedReader reader, final KEY_TYPE[] array, final int offset, final int length ) throws IOException {
PACKAGE.ARRAYS.ensureOffsetLength( array, offset, length );
int i = 0;
String s;
try {
for( i = 0; i < length; i++ )
if ( ( s = reader.readLine() ) != null ) array[ i + offset ] = KEY_CLASS.PARSE_KEY( s.trim() );
else break;
}
catch( EOFException itsOk ) {}
return i;
}
/** Loads elements from a given buffered reader, storing them in a given array.
*
* @param reader a buffered reader.
* @param array an array which will be filled with data from reader.
* @return the number of elements actually read from reader (it might be less than the array length if reader ends).
*/
public static int LOAD_KEYS( final BufferedReader reader, final KEY_TYPE[] array ) throws IOException {
return LOAD_KEYS( reader, array, 0, array.length );
}
/** Loads elements from a file given by a {@link File} object, storing them in a given array fragment.
*
* @param file a file.
* @param array an array which will be filled with data from the specified file.
* @param offset the index of the first element of array to be filled.
* @param length the number of elements of array to be filled.
* @return the number of elements actually read from the given file (it might be less than length if the file is too short).
*/
public static int LOAD_KEYS( final File file, final KEY_TYPE[] array, final int offset, final int length ) throws IOException {
final BufferedReader reader = new BufferedReader( new FileReader( file ) );
final int result = LOAD_KEYS( reader, array, offset, length );
reader.close();
return result;
}
/** Loads elements from a file given by a filename, storing them in a given array fragment.
*
* @param filename a filename.
* @param array an array which will be filled with data from the specified file.
* @param offset the index of the first element of array to be filled.
* @param length the number of elements of array to be filled.
* @return the number of elements actually read from the given file (it might be less than length if the file is too short).
*/
public static int LOAD_KEYS( final CharSequence filename, final KEY_TYPE[] array, final int offset, final int length ) throws IOException {
return LOAD_KEYS( new File( filename.toString() ), array, offset, length );
}
/** Loads elements from a file given by a {@link File} object, storing them in a given array.
*
* @param file a file.
* @param array an array which will be filled with data from the specified file.
* @return the number of elements actually read from the given file (it might be less than the array length if the file is too short).
*/
public static int LOAD_KEYS( final File file, final KEY_TYPE[] array ) throws IOException {
return LOAD_KEYS( file, array, 0, array.length );
}
/** Loads elements from a file given by a filename, storing them in a given array.
*
* @param filename a filename.
* @param array an array which will be filled with data from the specified file.
* @return the number of elements actually read from the given file (it might be less than the array length if the file is too short).
*/
public static int LOAD_KEYS( final CharSequence filename, final KEY_TYPE[] array ) throws IOException {
return LOAD_KEYS( filename, array, 0, array.length );
}
/** Stores an array fragment to a given print stream.
*
* @param array an array whose elements will be written to stream.
* @param offset the index of the first element of array to be written.
* @param length the number of elements of array to be written.
* @param stream a print stream.
*/
public static void STORE_KEYS( final KEY_TYPE array[], final int offset, final int length, final PrintStream stream ) {
PACKAGE.ARRAYS.ensureOffsetLength( array, offset, length );
for( int i = 0; i < length; i++ ) stream.println( array[ offset + i ] );
}
/** Stores an array to a given print stream.
*
* @param array an array whose elements will be written to stream.
* @param stream a print stream.
*/
public static void STORE_KEYS( final KEY_TYPE array[], final PrintStream stream ) {
STORE_KEYS( array, 0, array.length, stream );
}
/** Stores an array fragment to a file given by a {@link File} object.
*
* @param array an array whose elements will be written to filename.
* @param offset the index of the first element of array to be written.
* @param length the number of elements of array to be written.
* @param file a file.
*/
public static void STORE_KEYS( final KEY_TYPE array[], final int offset, final int length, final File file ) throws IOException {
final PrintStream stream = new PrintStream( new FastBufferedOutputStream( new FileOutputStream( file ) ) );
STORE_KEYS( array, offset, length, stream );
stream.close();
}
/** Stores an array fragment to a file given by a pathname.
*
* @param array an array whose elements will be written to filename.
* @param offset the index of the first element of array to be written.
* @param length the number of elements of array to be written.
* @param filename a filename.
*/
public static void STORE_KEYS( final KEY_TYPE array[], final int offset, final int length, final CharSequence filename ) throws IOException {
STORE_KEYS( array, offset, length, new File( filename.toString() ) );
}
/** Stores an array to a file given by a {@link File} object.
*
* @param array an array whose elements will be written to filename.
* @param file a file.
*/
public static void STORE_KEYS( final KEY_TYPE array[], final File file ) throws IOException {
STORE_KEYS( array, 0, array.length, file );
}
/** Stores an array to a file given by a pathname.
*
* @param array an array whose elements will be written to filename.
* @param filename a filename.
*/
public static void STORE_KEYS( final KEY_TYPE array[], final CharSequence filename ) throws IOException {
STORE_KEYS( array, 0, array.length, filename );
}
/** Stores the element returned by an iterator to a given print stream.
*
* @param i an iterator whose output will be written to stream.
* @param stream a print stream.
*/
public static void STORE_KEYS( final KEY_ITERATOR i, final PrintStream stream ) {
while( i.hasNext() ) stream.println( i.NEXT_KEY() );
}
/** Stores the element returned by an iterator to a file given by a {@link File} object.
*
* @param i an iterator whose output will be written to filename.
* @param file a file.
*/
public static void STORE_KEYS( final KEY_ITERATOR i, final File file ) throws IOException {
final PrintStream stream = new PrintStream( new FastBufferedOutputStream( new FileOutputStream( file ) ) );
STORE_KEYS( i, stream );
stream.close();
}
/** Stores the element returned by an iterator to a file given by a pathname.
*
* @param i an iterator whose output will be written to filename.
* @param filename a filename.
*/
public static void STORE_KEYS( final KEY_ITERATOR i, final CharSequence filename ) throws IOException {
STORE_KEYS( i, new File( filename.toString() ) );
}
/** Loads elements from a given fast buffered reader, storing them in a given big-array fragment.
*
* @param reader a buffered reader.
* @param array a big array which will be filled with data from reader.
* @param offset the index of the first element of array to be filled.
* @param length the number of elements of array to be filled.
* @return the number of elements actually read from reader (it might be less than length if reader ends).
*/
public static long LOAD_KEYS( final BufferedReader reader, final KEY_TYPE[][] array, final long offset, final long length ) throws IOException {
PACKAGE.BIG_ARRAYS.ensureOffsetLength( array, offset, length );
long c = 0;
String s;
try {
for( int i = segment( offset ); i < segment( offset + length + SEGMENT_MASK ); i++ ) {
final KEY_TYPE[] t = array[ i ];
final int l = (int)Math.min( t.length, offset + length - start( i ) );
for( int d = (int)Math.max( 0, offset - start( i ) ); d < l; d++ ) {
if ( ( s = reader.readLine() ) != null ) t[ d ] = KEY_CLASS.PARSE_KEY( s.trim() );
else return c;
c++;
}
}
}
catch( EOFException itsOk ) {}
return c;
}
/** Loads elements from a given buffered reader, storing them in a given array.
*
* @param reader a buffered reader.
* @param array a big array which will be filled with data from reader.
* @return the number of elements actually read from reader (it might be less than the array length if reader ends).
*/
public static long LOAD_KEYS( final BufferedReader reader, final KEY_TYPE[][] array ) throws IOException {
return LOAD_KEYS( reader, array, 0, PACKAGE.BIG_ARRAYS.length( array ) );
}
/** Loads elements from a file given by a {@link File} object, storing them in a given big-array fragment.
*
* @param file a file.
* @param array a big array which will be filled with data from the specified file.
* @param offset the index of the first element of array to be filled.
* @param length the number of elements of array to be filled.
* @return the number of elements actually read from the given file (it might be less than length if the file is too short).
*/
public static long LOAD_KEYS( final File file, final KEY_TYPE[][] array, final long offset, final long length ) throws IOException {
final BufferedReader reader = new BufferedReader( new FileReader( file ) );
final long result = LOAD_KEYS( reader, array, offset, length );
reader.close();
return result;
}
/** Loads elements from a file given by a filename, storing them in a given big-array fragment.
*
* @param filename a filename.
* @param array a big array which will be filled with data from the specified file.
* @param offset the index of the first element of array to be filled.
* @param length the number of elements of array to be filled.
* @return the number of elements actually read from the given file (it might be less than length if the file is too short).
*/
public static long LOAD_KEYS( final CharSequence filename, final KEY_TYPE[][] array, final long offset, final long length ) throws IOException {
return LOAD_KEYS( new File( filename.toString() ), array, offset, length );
}
/** Loads elements from a file given by a {@link File} object, storing them in a given array.
*
* @param file a file.
* @param array a big array which will be filled with data from the specified file.
* @return the number of elements actually read from the given file (it might be less than the array length if the file is too short).
*/
public static long LOAD_KEYS( final File file, final KEY_TYPE[][] array ) throws IOException {
return LOAD_KEYS( file, array, 0, PACKAGE.BIG_ARRAYS.length( array ) );
}
/** Loads elements from a file given by a filename, storing them in a given array.
*
* @param filename a filename.
* @param array a big array which will be filled with data from the specified file.
* @return the number of elements actually read from the given file (it might be less than the array length if the file is too short).
*/
public static long LOAD_KEYS( final CharSequence filename, final KEY_TYPE[][] array ) throws IOException {
return LOAD_KEYS( filename, array, 0, PACKAGE.BIG_ARRAYS.length( array ) );
}
/** Stores a big-array fragment to a given print stream.
*
* @param array a big array whose elements will be written to stream.
* @param offset the index of the first element of array to be written.
* @param length the number of elements of array to be written.
* @param stream a print stream.
*/
public static void STORE_KEYS( final KEY_TYPE array[][], final long offset, final long length, final PrintStream stream ) {
PACKAGE.BIG_ARRAYS.ensureOffsetLength( array, offset, length );
for( int i = segment( offset ); i < segment( offset + length + SEGMENT_MASK ); i++ ) {
final KEY_TYPE[] t = array[ i ];
final int l = (int)Math.min( t.length, offset + length - start( i ) );
for( int d = (int)Math.max( 0, offset - start( i ) ); d < l; d++ ) stream.println( t[ d ] );
}
}
/** Stores a big array to a given print stream.
*
* @param array a big array whose elements will be written to stream.
* @param stream a print stream.
*/
public static void STORE_KEYS( final KEY_TYPE array[][], final PrintStream stream ) {
STORE_KEYS( array, 0, PACKAGE.BIG_ARRAYS.length( array ), stream );
}
/** Stores a big-array fragment to a file given by a {@link File} object.
*
* @param array a big array whose elements will be written to filename.
* @param offset the index of the first element of array to be written.
* @param length the number of elements of array to be written.
* @param file a file.
*/
public static void STORE_KEYS( final KEY_TYPE array[][], final long offset, final long length, final File file ) throws IOException {
final PrintStream stream = new PrintStream( new FastBufferedOutputStream( new FileOutputStream( file ) ) );
STORE_KEYS( array, offset, length, stream );
stream.close();
}
/** Stores a big-array fragment to a file given by a pathname.
*
* @param array a big array whose elements will be written to filename.
* @param offset the index of the first element of array to be written.
* @param length the number of elements of array to be written.
* @param filename a filename.
*/
public static void STORE_KEYS( final KEY_TYPE array[][], final long offset, final long length, final CharSequence filename ) throws IOException {
STORE_KEYS( array, offset, length, new File( filename.toString() ) );
}
/** Stores a big array to a file given by a {@link File} object.
*
* @param array a big array whose elements will be written to filename.
* @param file a file.
*/
public static void STORE_KEYS( final KEY_TYPE array[][], final File file ) throws IOException {
STORE_KEYS( array, 0, PACKAGE.BIG_ARRAYS.length( array ), file );
}
/** Stores a big array to a file given by a pathname.
*
* @param array a big array whose elements will be written to filename.
* @param filename a filename.
*/
public static void STORE_KEYS( final KEY_TYPE array[][], final CharSequence filename ) throws IOException {
STORE_KEYS( array, 0, PACKAGE.BIG_ARRAYS.length( array ), filename );
}
/** A wrapper that exhibits the content of a reader as a type-specific iterator. */
final private static class KEY_READER_WRAPPER extends KEY_ABSTRACT_ITERATOR {
final private BufferedReader reader;
private boolean toAdvance = true;
private String s;
private KEY_TYPE next;
public KEY_READER_WRAPPER( final BufferedReader reader ) {
this.reader = reader;
}
public boolean hasNext() {
if ( ! toAdvance ) return s != null;
toAdvance = false;
try {
s = reader.readLine();
}
catch( EOFException itsOk ) {}
catch( IOException rethrow ) { throw new RuntimeException( rethrow ); }
if ( s == null ) return false;
next = KEY_CLASS.PARSE_KEY( s.trim() );
return true;
}
public KEY_TYPE NEXT_KEY() {
if (! hasNext()) throw new NoSuchElementException();
toAdvance = true;
return next;
}
}
/** Wraps the given buffered reader into an iterator.
*
* @param reader a buffered reader.
*/
public static KEY_ITERATOR AS_KEY_ITERATOR( final BufferedReader reader ) {
return new KEY_READER_WRAPPER( reader );
}
/** Wraps a file given by a {@link File} object into an iterator.
*
* @param file a file.
*/
public static KEY_ITERATOR AS_KEY_ITERATOR( final File file ) throws IOException {
return new KEY_READER_WRAPPER( new BufferedReader( new FileReader( file ) ) );
}
/** Wraps a file given by a pathname into an iterator.
*
* @param filename a filename.
*/
public static KEY_ITERATOR AS_KEY_ITERATOR( final CharSequence filename ) throws IOException {
return AS_KEY_ITERATOR( new File( filename.toString() ) );
}
/** Wraps a file given by a {@link File} object into an iterable object.
*
* @param file a file.
*/
public static KEY_ITERABLE AS_KEY_ITERABLE( final File file ) {
return new KEY_ITERABLE() {
public KEY_ITERATOR iterator() {
try {
return AS_KEY_ITERATOR( file );
}
catch( IOException e ) {
throw new RuntimeException( e );
}
}
};
}
/** Wraps a file given by a pathname into an iterable object.
*
* @param filename a filename.
*/
public static KEY_ITERABLE AS_KEY_ITERABLE( final CharSequence filename ) {
return new KEY_ITERABLE() {
public KEY_ITERATOR iterator() {
try {
return AS_KEY_ITERATOR( filename );
}
catch( IOException e ) {
throw new RuntimeException( e );
}
}
};
}
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