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AbstractComparisonExpression.java
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AbstractComparisonExpression.java
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package cz.cvut.kbss.jopa.query.criteria.expressions;
import cz.cvut.kbss.jopa.query.criteria.CriteriaFactoryImpl;
import cz.cvut.kbss.jopa.query.criteria.CriteriaParameterFiller;
import cz.cvut.kbss.jopa.sessions.CriteriaFactory;
abstract public class AbstractComparisonExpression<Y> extends AbstractExpression<Y> {
protected AbstractExpression<?> right;
protected AbstractExpression<?> left;
protected ExpressionLiteralImpl literal;
protected final CriteriaFactory factory;
public AbstractComparisonExpression(AbstractExpression<Y> x, AbstractExpression<?> y, CriteriaFactory factory) {
super(null);
this.left = x;
this.right = y;
this.factory = factory;
this.literal = null;
}
public AbstractComparisonExpression(AbstractExpression<?> x, Object y, CriteriaFactory factory) {
super(null);
this.left = x;
this.factory = factory;
this.right = null;
this.literal = (ExpressionLiteralImpl) factory.literal(y);
}
public AbstractComparisonExpression(AbstractExpression<?> x, String y, String languageTag, CriteriaFactory factory) {
super(null);
this.left = x;
this.factory = factory;
this.right = null;
this.literal = (ExpressionLiteralImpl) factory.literal(y,languageTag);
}
@Override
public void setExpressionToQuery(StringBuilder query, CriteriaParameterFiller parameterFiller) {
this.left.setExpressionToQuery(query, parameterFiller);
query.append(this.getComparisonOperator());
if (right != null){
this.right.setExpressionToQuery(query, parameterFiller);
} else {
query.append(parameterFiller.registerParameter(literal));
}
}
abstract protected String getComparisonOperator();
}