package org.h2.expression.condition;
import org.h2.engine.Session;
import org.h2.expression.Expression;
import org.h2.expression.ExpressionVisitor;
import org.h2.expression.ValueExpression;
import org.h2.table.ColumnResolver;
import org.h2.table.TableFilter;
import org.h2.value.Value;
import org.h2.value.ValueNull;
public class ConditionNot extends Condition {
private Expression condition;
public ConditionNot(Expression condition) {
this.condition = condition;
}
@Override
public Expression getNotIfPossible(Session session) {
return condition;
}
@Override
public Value getValue(Session session) {
Value v = condition.getValue(session);
if (v == ValueNull.INSTANCE) {
return v;
}
return v.convertTo(Value.BOOLEAN).negate();
}
@Override
public void mapColumns(ColumnResolver resolver, int level, int state) {
condition.mapColumns(resolver, level, state);
}
@Override
public Expression optimize(Session session) {
Expression e2 = condition.getNotIfPossible(session);
if (e2 != null) {
return e2.optimize(session);
}
Expression expr = condition.optimize(session);
if (expr.isConstant()) {
Value v = expr.getValue(session);
if (v == ValueNull.INSTANCE) {
return ValueExpression.getNull();
}
return ValueExpression.get(v.convertTo(Value.BOOLEAN).negate());
}
condition = expr;
return this;
}
@Override
public void setEvaluatable(TableFilter tableFilter, boolean b) {
condition.setEvaluatable(tableFilter, b);
}
@Override
public StringBuilder getSQL(StringBuilder builder, boolean alwaysQuote) {
builder.append("(NOT ");
return condition.getSQL(builder, alwaysQuote).append(')');
}
@Override
public void updateAggregate(Session session, int stage) {
condition.updateAggregate(session, stage);
}
@Override
public void addFilterConditions(TableFilter filter, boolean outerJoin) {
if (outerJoin) {
return;
}
super.addFilterConditions(filter, outerJoin);
}
@Override
public boolean isEverything(ExpressionVisitor visitor) {
return condition.isEverything(visitor);
}
@Override
public int getCost() {
return condition.getCost();
}
@Override
public int getSubexpressionCount() {
return 1;
}
@Override
public Expression getSubexpression(int index) {
if (index == 0) {
return condition;
}
throw new IndexOutOfBoundsException();
}
}