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Sigma knowledge engineering system is an system for developing, viewing and debugging theories in first order logic. It works with Knowledge Interchange Format (KIF) and is optimized for the Suggested Upper Merged Ontology (SUMO) www.ontologyportal.org.

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/*
 * Copyright 2014-2015 IPsoft
 *
 * Author: Andrei Holub [email protected]
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program ; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA  02111-1307 USA
 */
package com.articulate.sigma.semRewrite.substitutor;

import com.google.common.collect.Lists;
import edu.stanford.nlp.ling.CoreLabel;

import java.util.List;
import java.util.Optional;

import static com.articulate.sigma.semRewrite.substitutor.CoreLabelSequence.EMPTY_SEQUENCE;

/** **************************************************************
 * This substitutor helps to group set of other substitutors together.
 * All the search/contains calls will return success results if any of united substitutor can do that.
  */
public class SubstitutorsUnion implements ClauseSubstitutor {

    final List substitutors;

    public SubstitutorsUnion(List substitutors) {
        this.substitutors = substitutors;
    }

    public static ClauseSubstitutor of(ClauseSubstitutor... substitutors) {
        SubstitutorsUnion combinator = new SubstitutorsUnion(
                Lists.newArrayList(substitutors)
        );
        return combinator;
    }

    @Override
    public boolean containsKey(CoreLabel key) {

        return substitutors.stream()
                .anyMatch(substitutor -> substitutor.containsKey(key));
    }

    @Override
    public boolean containsKey(String keyLabel) {

        return substitutors.stream()
                .anyMatch(substitutor -> substitutor.containsKey(keyLabel));
    }

    @Override
    public Optional getGroupedByFirstLabel(CoreLabel label) {

        return substitutors.stream()
                .map(substitutor -> substitutor.getGroupedByFirstLabel(label))
                .filter(seq -> seq.isPresent())
                .findFirst()
                .orElse(Optional.empty());
    }

    @Override
    public CoreLabelSequence getGrouped(CoreLabel key) {

        return substitutors.stream()
                .filter(substitutor -> substitutor.containsKey(key))
                .map(substitutor -> substitutor.getGrouped(key))
                .findFirst()
                .orElse(EMPTY_SEQUENCE);
    }

    @Override
    public CoreLabelSequence getGrouped(String keyLabel) {

        return substitutors.stream()
                .filter(substitutor -> substitutor.containsKey(keyLabel))
                .map(substitutor -> substitutor.getGrouped(keyLabel))
                .findFirst()
                .orElse(EMPTY_SEQUENCE);
    }
}