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com.dottydingo.hyperion.jpa.persistence.query.AbstractEntityJpaQueryBuilder Maven / Gradle / Ivy
package com.dottydingo.hyperion.jpa.persistence.query;
import com.dottydingo.hyperion.api.exception.BadRequestException;
import com.dottydingo.hyperion.core.persistence.PersistenceContext;
import com.dottydingo.hyperion.core.persistence.query.ArgumentParser;
import com.dottydingo.hyperion.core.persistence.query.DefaultArgumentParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import java.util.Collection;
/**
*/
public abstract class AbstractEntityJpaQueryBuilder implements JpaEntityQueryBuilder
{
public static final String INCOMPATIBLE_QUERY_OPERATION = "ERROR_INCOMPATIBLE_QUERY_OPERATION";
private Logger logger = LoggerFactory.getLogger(AbstractEntityJpaQueryBuilder.class);
protected static final Character LIKE_WILDCARD = '*';
protected ArgumentParser argumentParser = DefaultArgumentParser.getInstance();
public void setArgumentParser(ArgumentParser argumentParser)
{
this.argumentParser = argumentParser;
}
/**
* Delegate creating of a Predicate to an appropriate method according to
* operator.
*
* @param root root
* @param query query
* @param propertyName property name
* @param operator comparison operator
* @param argument argument
* @param context context
* @return Predicate
*/
protected Predicate createPredicate(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyName,
ComparisonOperator operator, Object argument, PersistenceContext context)
{
logger.debug("Creating criterion: {} {} {}", propertyName, operator, argument);
switch (operator)
{
case EQUAL:
{
if (containWildcard(argument))
{
return createLike(root, query, cb, propertyName, argument, context);
}
else
{
return createEqual(root, query, cb, propertyName, argument, context);
}
}
case NOT_EQUAL:
{
if (containWildcard(argument))
{
return createNotLike(root, query, cb, propertyName, argument, context);
}
else
{
return createNotEqual(root, query, cb, propertyName, argument, context);
}
}
case GREATER_THAN:
return createGreaterThan(root, query, cb, propertyName, argument, context);
case GREATER_EQUAL:
return createGreaterEqual(root, query, cb, propertyName, argument, context);
case LESS_THAN:
return createLessThan(root, query, cb, propertyName, argument, context);
case LESS_EQUAL:
return createLessEqual(root, query, cb, propertyName, argument, context);
case IN:
return createIn(root, query, cb, propertyName, argument, context);
case NOT_IN:
return createNotIn(root, query, cb, propertyName, argument, context);
}
throw new IllegalArgumentException("Unknown operator: " + operator);
}
/**
* Apply an "equal" constraint to the named property.
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createEqual(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath,
Object argument, PersistenceContext context)
{
return cb.equal(root.get(propertyPath), argument);
}
/**
* Apply a case-insensitive "like" constraint to the named property. Value
* should contains wildcards "*" (% in SQL) and "_".
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createLike(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
String like = (String) argument;
like = like.replace(LIKE_WILDCARD, '%');
return cb.like(cb.lower(root.get(propertyPath)), like.toLowerCase());
}
/**
* Apply a "not equal" constraint to the named property.
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createNotEqual(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
return cb.notEqual(root.get(propertyPath), argument);
}
/**
* Apply a negative case-insensitive "like" constraint to the named property.
* Value should contains wildcards "*" (% in SQL) and "_".
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument Value with wildcards.
* @param context
* @return Predicate
*/
protected Predicate createNotLike(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
return cb.notLike(root.get(propertyPath), (String) argument);
}
/**
* Apply a "greater than" constraint to the named property.
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createGreaterThan(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
if(!(argument instanceof Comparable))
throw new BadRequestException(context.getMessageSource().getErrorMessage(
INCOMPATIBLE_QUERY_OPERATION, context.getLocale(), "gt"));
return cb.greaterThan(root.get(propertyPath), (Comparable) argument);
}
/**
* Apply a "greater than or equal" constraint to the named property.
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createGreaterEqual(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
if(!(argument instanceof Comparable))
throw new BadRequestException(context.getMessageSource().getErrorMessage(
INCOMPATIBLE_QUERY_OPERATION, context.getLocale(), "ge"));
return cb.greaterThanOrEqualTo(root.get(propertyPath), (Comparable) argument);
}
/**
* Apply a "less than" constraint to the named property.
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createLessThan(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
if(!(argument instanceof Comparable))
throw new BadRequestException(context.getMessageSource().getErrorMessage(
INCOMPATIBLE_QUERY_OPERATION, context.getLocale(), "lt"));
return cb.lessThan(root.get(propertyPath), (Comparable) argument);
}
/**
* Apply a "less than or equal" constraint to the named property.
*
*
* @param query
* @param propertyPath property name prefixed with an association alias
* @param argument value
* @param context
* @return Predicate
*/
protected Predicate createLessEqual(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
if(!(argument instanceof Comparable))
throw new BadRequestException(context.getMessageSource().getErrorMessage(
INCOMPATIBLE_QUERY_OPERATION,context.getLocale(),"le"));
return cb.lessThanOrEqualTo(root.get(propertyPath), (Comparable) argument);
}
protected Predicate createIn(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
if(!(argument instanceof Collection))
throw new BadRequestException(context.getMessageSource().getErrorMessage(
INCOMPATIBLE_QUERY_OPERATION, context.getLocale(), "in"));
Path expression = root.get(propertyPath);
return expression.in((Collection)argument);
}
protected Predicate createNotIn(Path root, CriteriaQuery query, CriteriaBuilder cb, String propertyPath, Object argument,
PersistenceContext context)
{
if(!(argument instanceof Collection))
throw new BadRequestException(context.getMessageSource().getErrorMessage(
INCOMPATIBLE_QUERY_OPERATION, context.getLocale(), "not in"));
Path expression = root.get(propertyPath);
return cb.not(expression.in((Collection)argument));
}
/**
* Check if given value contains wildcard.
*
* @param value the value
* @return Return true if argument contains {@link #LIKE_WILDCARD}.
*/
protected boolean containWildcard(Object value)
{
if (!(value instanceof String))
{
return false;
}
String casted = (String) value;
return casted.contains(LIKE_WILDCARD.toString());
}
}
