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CriteriaBuilderImpl.java
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CriteriaBuilderImpl.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.query.criteria;
import cz.cvut.kbss.jopa.model.CriteriaQueryImpl;
import cz.cvut.kbss.jopa.model.query.criteria.*;
import cz.cvut.kbss.jopa.query.criteria.expressions.*;
import cz.cvut.kbss.jopa.sessions.CriteriaBuilder;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import java.util.Arrays;
public class CriteriaBuilderImpl implements CriteriaBuilder {
private final UnitOfWorkImpl uow;
public CriteriaBuilderImpl(UnitOfWorkImpl uow) {
this.uow = uow;
}
@Override
public <T> CriteriaQuery<T> createQuery(Class<T> resultClass) {
return new CriteriaQueryImpl<>(new CriteriaQueryHolder<>(resultClass), uow.getMetamodel(), this);
}
@Override
public Expression<Integer> count(Expression<?> x) {
if (x == null) throw new IllegalArgumentException("Aggregate function cannot be applied to null expression.");
if (x instanceof AbstractPathExpression) {
return new ExpressionCountImpl<>(Integer.class, (AbstractPathExpression) x, this);
}
throw new IllegalArgumentException("Aggregate function can be applied only to path expressions.");
}
@Override
public <T> ParameterExpression<T> parameter(Class<T> paramClass) {
if (paramClass == null) throw new IllegalArgumentException("Class must be defined.");
return new ParameterExpressionImpl<>(paramClass, null, this);
}
@Override
public <T> ParameterExpression<T> parameter(Class<T> paramClass, String name) {
if (paramClass == null) throw new IllegalArgumentException("Class must be defined.");
return new ParameterExpressionImpl<>(paramClass, name, this);
}
@Override
public <T> Expression<T> literal(T value) throws IllegalArgumentException {
if (value == null) throw new IllegalArgumentException("Literal cannot be null.");
return new ExpressionLiteralImpl<>(value, this);
}
@Override
public Expression<String> literal(String value, String languageTag) throws IllegalArgumentException {
if (value == null) throw new IllegalArgumentException("Literal cannot be null.");
return new ExpressionLiteralImpl<>(value, languageTag, this);
}
@Override
public Order asc(Expression<?> x) {
return new OrderImpl(x);
}
@Override
public Order desc(Expression<?> x) {
return new OrderImpl(x, false);
}
@Override
public Predicate and(Expression<Boolean> x, Expression<Boolean> y) {
return new CompoundedPredicateImpl(Predicate.BooleanOperator.AND, Arrays.asList(x, y), this);
}
@Override
public Predicate and(Predicate... restrictions) {
if (restrictions.length == 1) return new SimplePredicateImpl(restrictions[0], this);
else return new CompoundedPredicateImpl(Predicate.BooleanOperator.AND, Arrays.asList(restrictions), this);
}
@Override
public Predicate or(Expression<Boolean> x, Expression<Boolean> y) {
return new CompoundedPredicateImpl(Predicate.BooleanOperator.OR, Arrays.asList(x, y), this);
}
@Override
public Predicate or(Predicate... restrictions) {
if (restrictions.length == 1)
return new SimplePredicateImpl(Predicate.BooleanOperator.OR, restrictions[0], this);
else return new CompoundedPredicateImpl(Predicate.BooleanOperator.OR, Arrays.asList(restrictions), this);
}
@Override
public Predicate equal(Expression<?> x, Expression<?> y) {
return new SimplePredicateImpl(new ExpressionEqualImpl((AbstractExpression<?>) x, (AbstractExpression<?>) y, this), this);
}
@Override
public Predicate equal(Expression<?> x, Object y) {
return new SimplePredicateImpl(new ExpressionEqualImpl((AbstractExpression<?>) x, new ExpressionLiteralImpl<>(y, this), this), this);
}
@Override
public Predicate equal(Expression<?> x, String y, String languageTag) {
return new SimplePredicateImpl(new ExpressionEqualImpl((AbstractExpression<?>) x, new ExpressionLiteralImpl<>(y, languageTag, this), this), this);
}
@Override
public Predicate notEqual(Expression<?> x, Expression<?> y) {
return new SimplePredicateImpl(new ExpressionNotEqualImpl((AbstractExpression<?>) x, (AbstractExpression<?>) y, this), this);
}
@Override
public Predicate notEqual(Expression<?> x, Object y) {
return new SimplePredicateImpl(new ExpressionNotEqualImpl((AbstractExpression<?>) x, new ExpressionLiteralImpl<>(y, this), this), this);
}
@Override
public Predicate like(Expression<String> x, Expression<String> pattern) {
return new SimplePredicateImpl(new ExpressionLikeImpl((AbstractExpression<String>) x, (AbstractExpression<String>) pattern, this), this);
}
@Override
public Predicate like(Expression<String> x, String pattern) {
return new SimplePredicateImpl(new ExpressionLikeImpl((AbstractExpression<String>) x, new ExpressionLiteralImpl<>(pattern, this), this), this);
}
@Override
public Predicate notLike(Expression<String> x, Expression<String> pattern) {
return new SimplePredicateImpl(new ExpressionNotLikeImpl((AbstractExpression<String>) x, (AbstractExpression<String>) pattern, this), this);
}
@Override
public Predicate notLike(Expression<String> x, String pattern) {
return new SimplePredicateImpl(new ExpressionNotLikeImpl((AbstractExpression<String>) x, new ExpressionLiteralImpl<>(pattern, this), this), this);
}
@Override
public Predicate not(Expression<Boolean> restriction) {
return wrapExpressionToPredicateWithRepair(restriction).not();
}
@Override
public <T> In<T> in(Expression<? extends T> expression) {
return new ExpressionInImpl<>(expression, this);
}
@Override
public <T> In<T> notIn(Expression<? extends T> expression) {
In<T> inExpression = new ExpressionInImpl<>(expression, this);
inExpression.not();
return inExpression;
}
@Override
public <Y extends Comparable<? super Y>> Predicate greaterThan(Expression<? extends Y> x, Expression<? extends Y> y) {
return new SimplePredicateImpl(new ExpressionGreaterThanImpl((AbstractExpression<Y>) x, (AbstractExpression<Y>) y, this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate greaterThan(Expression<? extends Y> x, Y y) {
return new SimplePredicateImpl(new ExpressionGreaterThanImpl((AbstractExpression<Y>) x, new ExpressionLiteralImpl<>(y, this), this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate greaterThanOrEqual(Expression<? extends Y> x, Expression<? extends Y> y) {
return new SimplePredicateImpl(new ExpressionGreaterThanOrEqualImpl((AbstractExpression<Y>) x, (AbstractExpression<Y>) y, this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate greaterThanOrEqual(Expression<? extends Y> x, Y y) {
return new SimplePredicateImpl(new ExpressionGreaterThanOrEqualImpl((AbstractExpression<Y>) x, new ExpressionLiteralImpl<>(y, this), this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate lessThan(Expression<? extends Y> x, Expression<? extends Y> y) {
return new SimplePredicateImpl(new ExpressionLessThanImpl((AbstractExpression<Y>) x, (AbstractExpression<Y>) y, this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate lessThan(Expression<? extends Y> x, Y y) {
return new SimplePredicateImpl(new ExpressionLessThanImpl((AbstractExpression<Y>) x, new ExpressionLiteralImpl<>(y, this), this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate lessThanOrEqual(Expression<? extends Y> x, Expression<? extends Y> y) {
return new SimplePredicateImpl(new ExpressionLessThanOrEqualImpl((AbstractExpression<Y>) x, (AbstractExpression<Y>) y, this), this);
}
@Override
public <Y extends Comparable<? super Y>> Predicate lessThanOrEqual(Expression<? extends Y> x, Y y) {
return new SimplePredicateImpl(new ExpressionLessThanOrEqualImpl((AbstractExpression<Y>) x, new ExpressionLiteralImpl<>(y, this), this), this);
}
/**
* Method wraps given boolean expression to Predicate and if path expression occur, it wrap it to ExpressionEqualsImpl before.
* For example:
* {@literal Expression<Boolean> expression = factory.get("attributeName");}
* Looks like boolean expression but in fact it is not boolean expression, so we need to fix this.
*
* @param expression - boolean or path expression
* @return Expression wrapped in Predicate
*/
public Predicate wrapExpressionToPredicateWithRepair(Expression<Boolean> expression) {
if (expression instanceof Predicate) {
return (Predicate) expression;
} else if (expression instanceof AbstractPathExpression) {
return new SimplePredicateImpl(new ExpressionEqualImpl((AbstractExpression) expression, (AbstractExpression) this.literal(true), this), this);
} else {
return new SimplePredicateImpl(expression, this);
}
}
}