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AbstractExpression.java
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AbstractExpression.java
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package cz.cvut.kbss.jopa.query.criteria.expressions;
import cz.cvut.kbss.jopa.model.query.criteria.Expression;
import cz.cvut.kbss.jopa.model.query.criteria.Predicate;
import cz.cvut.kbss.jopa.model.query.criteria.PredicateFactory;
import cz.cvut.kbss.jopa.query.criteria.CriteriaParameterFiller;
import cz.cvut.kbss.jopa.query.criteria.SelectionImpl;
import cz.cvut.kbss.jopa.sessions.CriteriaBuilder;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
/**
* Parent of all other types of expressions. It offers its children the implementation of methods for IN expression as prescribed by the Expression interface.
* Prescribes an abstract method for expressing an expression to string builder representing the query.
*/
abstract public class AbstractExpression<Y> extends SelectionImpl<Y> implements Expression<Y> {
protected final CriteriaBuilder cb;
protected boolean negated;
public AbstractExpression(Class<Y> type, CriteriaBuilder cb) {
super(type);
this.cb = cb;
negated = false;
}
//TODO - BAKALARKA - KONZULTACIA
// da sa Collection<?> spracovat lepsie?
@Override
public Predicate in(Collection<?> values) {
PredicateFactory.In<Y> predicate = cb.in(this);
for (Object value : values) {
if (value instanceof AbstractExpression) {
predicate.value((Expression<? extends Y>) value);
} else {
predicate.value(cb.literal((Y) value));
}
}
return predicate;
}
//TODO - BAKALARKA - KONZULTACIA
// da sa spracovat lepsie?
@Override
public Predicate in(Expression<?>... values) {
PredicateFactory.In<Y> predicate = cb.in(this);
for (Expression value : values) {
predicate.value((Expression<? extends Y>) value);
}
return predicate;
}
@Override
public Predicate in(Object... values) {
return this.in(Arrays.asList(values));
}
abstract public void setExpressionToQuery(StringBuilder query, CriteriaParameterFiller parameterFiller);
public boolean isNegated() {
return negated;
}
public void negate() {
this.negated = true;
}
}