fr.liglab.jlcm.internals.transactions.IntIndexedTransactionsList Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jLCM Show documentation

A multi-threaded implementation of the LCM (Linear Closed itemsets Miner) algorithm proposed by T.Uno and H.Arimura

There is a newer version: 1.7.0

/*
	This file is part of jLCM - see https://github.com/martinkirch/jlcm/
	
	Copyright 2013,2014 Martin Kirchgessner, Vincent Leroy, Alexandre Termier, Sihem Amer-Yahia, Marie-Christine Rousset, Université Joseph Fourier and CNRS

	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
	 
	or see the LICENSE.txt file joined with this program.

	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 fr.liglab.jlcm.internals.transactions;

import java.util.Arrays;

import fr.liglab.jlcm.internals.Counters;

public final class IntIndexedTransactionsList extends TransactionsList {

	public static boolean compatible(Counters c) {
		return true;
	}

	public static int getMaxTransId(Counters c) {
		return c.distinctTransactionsCount - 1;
	}

	int[] concatenated;

	public IntIndexedTransactionsList(Counters c) {
		this(c.distinctTransactionLengthSum, c.distinctTransactionsCount);
	}

	public IntIndexedTransactionsList(int transactionsLength, int nbTransactions) {
		super(nbTransactions);
		this.concatenated = new int[transactionsLength];
	}

	@Override
	public IndexedReusableIterator getIterator() {
		return new TransIter();
	}

	@Override
	public void addItem(int item) {
		this.concatenated[this.writeIndex] = item;
		this.writeIndex++;
	}

	@Override
	public TransactionsList clone() {
		IntIndexedTransactionsList o = (IntIndexedTransactionsList) super.clone();
		o.concatenated = Arrays.copyOf(this.concatenated, this.concatenated.length);
		return o;
	}

	private final class TransIter extends IndexedReusableIterator {
		
		@Override
		boolean isNextPosValid() {
			return concatenated[this.nextPos] != -1;
		}

		@Override
		void removePosVal() {
			concatenated[this.pos] = -1;
		}

		@Override
		int getPosVal() {
			return concatenated[this.pos];
		}
	}
}