com.adobe.cq.searchcollections.qom.EquiJoinMerger Maven / Gradle / Ivy

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 *  Copyright 2012 Adobe Systems Incorporated
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package com.adobe.cq.searchcollections.qom;

import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_EQUAL_TO;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.jcr.RepositoryException;
import javax.jcr.Value;
import javax.jcr.query.Row;
import javax.jcr.query.qom.Constraint;
import javax.jcr.query.qom.EquiJoinCondition;
import javax.jcr.query.qom.Join;
import javax.jcr.query.qom.Literal;
import javax.jcr.query.qom.PropertyValue;
import javax.jcr.query.qom.QueryObjectModelFactory;

/**
 * @deprecated
 */
class EquiJoinMerger extends JoinMerger {

    private final PropertyValue leftProperty;

    private final PropertyValue rightProperty;

    public EquiJoinMerger(
            Join join, Map columns,
            OperandEvaluator evaluator, QueryObjectModelFactory factory,
            EquiJoinCondition condition) throws RepositoryException {
        super(join, columns, evaluator, factory);

        PropertyValue property1 = factory.propertyValue(
                condition.getSelector1Name(), condition.getProperty1Name());
        PropertyValue property2 = factory.propertyValue(
                condition.getSelector2Name(), condition.getProperty2Name());

        if (leftSelectors.contains(property1.getSelectorName())
                && rightSelectors.contains(property2.getSelectorName())) {
            leftProperty = property1;
            rightProperty = property2;
        } else if (leftSelectors.contains(property2.getSelectorName())
                && rightSelectors.contains(property1.getSelectorName())) {
            leftProperty = property2;
            rightProperty = property1;
        } else {
            throw new RepositoryException("Invalid equi-join");
        }
    }

    @Override
    public Set getLeftValues(Row row) throws RepositoryException {
        return getValues(leftProperty, row);
    }

    @Override
    public Set getRightValues(Row row) throws RepositoryException {
        return getValues(rightProperty, row);
    }

    @Override
    public List getRightJoinConstraints(List leftRows)
            throws RepositoryException {
        Map literals = new HashMap();
        for (Row leftRow : leftRows) {
            for (Value value : evaluator.getValues(leftProperty, leftRow)) {
                literals.put(value.getString(), factory.literal(value));
            }
        }

        List constraints =
            new ArrayList(literals.size());
        for (Literal literal : literals.values()) {
            constraints.add(factory.comparison(
                    rightProperty, JCR_OPERATOR_EQUAL_TO, literal));
        }
        return constraints;
    }

    private Set getValues(PropertyValue property, Row row)
            throws RepositoryException {
        Set strings = new HashSet();
        for (Value value : evaluator.getValues(property, row)) {
            strings.add(value.getString());
        }
        return strings;
    }

}