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package javaewah32;

/*

* Copyright 2009-2012, Daniel Lemire, Cliff Moon, David McIntosh and Robert Becho

* Licensed under APL 2.0.

*/

/**

* The class EWAHIterator represents a special type of

* efficient iterator iterating over (uncompressed) words of bits.

*

* @author Daniel Lemire

* @since 0.5.0

*

*/

public final class EWAHIterator32 {

/**

* Instantiates a new eWAH iterator.

*

* @param a the array of words

* @param sizeinwords the number of words that are significant in the array of words

*/

public EWAHIterator32(final int[] a, final int sizeinwords) {

this.rlw = new RunningLengthWord32(a, 0);

this.size = sizeinwords;

this.pointer = 0;

}

/**

* Access to the array of words

*

* @return the int[]

*/

public int[] buffer() {

return this.rlw.array;

}

/**

* Position of the dirty words represented by this running length word.

*

* @return the int

*/

public int dirtyWords() {

return this.pointer - this.rlw.getNumberOfLiteralWords();

}

/**

* Checks for next.

*

* @return true, if successful

*/

public boolean hasNext() {

return this.pointer < this.size;

}

/**

* Next running length word.

*

* @return the running length word

*/

public RunningLengthWord32 next() {

this.rlw.position = this.pointer;

this.pointer += this.rlw.getNumberOfLiteralWords() + 1;

return this.rlw;

}

/** The pointer represent the location of the current running length

* word in the array of words (embedded in the rlw attribute). */

int pointer;

/** The current running length word. */

RunningLengthWord32 rlw;

/** The size in words. */

int size;

}