com.jwebmp.entityassist.querybuilder.builders.GroupedExpression Maven / Gradle / Ivy
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package com.jwebmp.entityassist.querybuilder.builders;
import com.jwebmp.entityassist.enumerations.GroupedFilterType;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.Predicate;
import java.util.*;
/**
* A grouped filter expression (bla bla bla) and (bla bla group 2)
*/
@SuppressWarnings("WeakerAccess")
public class GroupedExpression
implements IFilterExpression
{
/**
* The final set of expressions
*/
private final Set filterExpressions = new LinkedHashSet<>();
/**
* The type of filter to apply
*/
private GroupedFilterType groupedFilterType;
/**
* Returns the grouped filter type
*
* @return The given type
*/
@SuppressWarnings("unused")
public GroupedFilterType getGroupedFilterType()
{
return groupedFilterType;
}
/**
* Method setGroupedFilterType sets the groupedFilterType of this GroupedExpression object.
*
* The type of filter to apply
*
* @param groupedFilterType
* the groupedFilterType of this GroupedExpression object.
*
* @return GroupedExpression
*/
@SuppressWarnings("UnusedReturnValue")
public GroupedExpression setGroupedFilterType(GroupedFilterType groupedFilterType)
{
this.groupedFilterType = groupedFilterType;
return this;
}
/**
* Produces a predicate for the given filter expression
*
*
* @return The predicate to apply
*/
@Override
public Optional toPredicate(CriteriaBuilder builder)
{
List wheres = new ArrayList<>();
for (IFilterExpression filterExpression : getFilterExpressions())
{
Optional op = filterExpression.toPredicate(builder);
op.ifPresent(wheres::add);
}
if (wheres.isEmpty())
{
return Optional.empty();
}
else
{
Predicate[] preds = new Predicate[wheres.size()];
wheres.toArray(preds);
Predicate groupPredicate = builder.or(preds);
return Optional.of(groupPredicate);
}
}
/**
* Method getFilterExpressions returns the filterExpressions of this GroupedExpression object.
*
* The final set of expressions
*
* @return the filterExpressions (type Set IFilterExpression ) of this GroupedExpression object.
*/
public Set getFilterExpressions()
{
return filterExpressions;
}
}