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JSON API framework for Java

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package io.crnk.jpa.internal.query.backend;

import io.crnk.core.queryspec.Direction;
import io.crnk.core.queryspec.FilterOperator;
import io.crnk.meta.model.MetaAttribute;
import io.crnk.meta.model.MetaAttributePath;

import javax.persistence.criteria.JoinType;
import java.util.List;

public interface JpaQueryBackend {

	void distinct();

	F getRoot();

	void setOrder(List orderSpecListToOrderArray);

	List getOrderList();

	O newSort(E expression, Direction dir);

	void addPredicate(P predicate);

	E getAttribute(MetaAttributePath attrPath);

	void addParentPredicate(MetaAttribute primaryKeyAttr);

	boolean hasManyRootsFetchesOrJoins();

	void addSelection(E expression, String name);

	E getExpression(O order);

	boolean containsRelation(E expression);

	P buildPredicate(FilterOperator operator, MetaAttributePath path, Object value);

	P and(List predicates);

	P not(P predicate);

	P or(List predicates);

	Class getJavaElementType(E currentCriteriaPath);

	E getAttribute(E currentCriteriaPath, MetaAttribute pathElement);

	E joinSubType(E currentCriteriaPath, Class entityType);

	E joinMapValue(E currentCriteriaPath, MetaAttribute pathElement, Object key);

	F doJoin(MetaAttribute targetAttr, JoinType joinType, F parent);
}