org.aksw.sparqlify.database.PrefixIndexMetaFactory Maven / Gradle / Ivy

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package org.aksw.sparqlify.database;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.collections15.Transformer;

public class PrefixIndexMetaFactory
    implements MetaIndexFactory
{
    public static Set> supportedConstraintClasses = new HashSet>();

    static
    {
        supportedConstraintClasses.add(PrefixConstraint.class);
    }

    public Set> getSupportedConstraintClasses() {
        return supportedConstraintClasses;
    }


    private Transformer> prefixExtractor;

    public PrefixIndexMetaFactory(Transformer> prefixExtractor) {
        this.prefixExtractor = prefixExtractor;
    }

    @Override
    public MapStoreAccessor create(Table table, List columnNames) {

        int[] indexColumns = new int[columnNames.size()];

        for(int i = 0; i < indexColumns.length; ++i) {
            String columnName = columnNames.get(i);
            indexColumns[i] = table.getColumns().getIndex(columnName);
        }

        PrefixMapStoreAccessor accessor = new PrefixMapStoreAccessor(indexColumns, prefixExtractor);

        return accessor;
    }

}