cz.encircled.joiner.core.PredicateAliasResolver Maven / Gradle / Ivy

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package cz.encircled.joiner.core;

import com.querydsl.core.types.Operation;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.Predicate;
import cz.encircled.joiner.query.join.JoinDescription;

import java.lang.reflect.AnnotatedElement;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Implementation is responsible for predicate aliases lookup in a query
 *
 * @author Vlad on 10-Feb-17.
 */
public interface PredicateAliasResolver {

    /**
     * Resolves all correct paths used in specified predicate
     *
     * @param predicate   original predicate
     * @param joins       all query joins
     * @param usedAliases paths that are present in joins
     * @return rebuilt predicate
     * @see PredicateAliasResolver#resolvePath(Path, Map, Set)
     */
    Predicate resolvePredicate(Predicate predicate, List joins, Set> usedAliases);

    /**
     * Resolves all correct paths used in specified operation
     *
     * @param operation   original operation
     * @param joins       all query joins
     * @param usedAliases paths that are present in joins
     * @return rebuilt predicate
     * @see PredicateAliasResolver#resolvePath(Path, Map, Set)
     */
    Predicate resolveOperation(Operation operation, List joins, Set> usedAliases);

    /**
     * If alias from path is not present in usedAliases, try to find it in joins.
     * If unambiguous alias is found, return rebuilt Path with corresponding alias.
     * 
     * It other words, it allows to use QStatus.status.some... instead of J#path(QStatusParent.parent, QStatus.status
     * (when target path is unambiguous, i.e. exactly one join with java type Status is present)
     * 
     *
     * @param path        original path
     * @param classToJoin java type to present joins
     * @param usedAliases paths that are present in joins
     * @param          any
     * @return rebuilt or original path
     */
     Path resolvePath(Path path, Map> classToJoin, Set> usedAliases);
}