com.impetus.kundera.query.KunderaQueryUtils Maven / Gradle / Ivy
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* * Copyright 2015 Impetus Infotech.
* *
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
******************************************************************************/
package com.impetus.kundera.query;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import javax.persistence.metamodel.EmbeddableType;
import javax.persistence.metamodel.EntityType;
import org.eclipse.persistence.jpa.jpql.parser.AggregateFunction;
import org.eclipse.persistence.jpa.jpql.parser.BetweenExpression;
import org.eclipse.persistence.jpa.jpql.parser.CollectionExpression;
import org.eclipse.persistence.jpa.jpql.parser.ComparisonExpression;
import org.eclipse.persistence.jpa.jpql.parser.DeleteStatement;
import org.eclipse.persistence.jpa.jpql.parser.Expression;
import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariable;
import org.eclipse.persistence.jpa.jpql.parser.InExpression;
import org.eclipse.persistence.jpa.jpql.parser.InputParameter;
import org.eclipse.persistence.jpa.jpql.parser.JPQLExpression;
import org.eclipse.persistence.jpa.jpql.parser.KeywordExpression;
import org.eclipse.persistence.jpa.jpql.parser.LikeExpression;
import org.eclipse.persistence.jpa.jpql.parser.LogicalExpression;
import org.eclipse.persistence.jpa.jpql.parser.NumericLiteral;
import org.eclipse.persistence.jpa.jpql.parser.SelectStatement;
import org.eclipse.persistence.jpa.jpql.parser.StateFieldPathExpression;
import org.eclipse.persistence.jpa.jpql.parser.StringLiteral;
import org.eclipse.persistence.jpa.jpql.parser.SubExpression;
import org.eclipse.persistence.jpa.jpql.parser.UpdateStatement;
import org.eclipse.persistence.jpa.jpql.parser.WhereClause;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.impetus.kundera.Constants;
import com.impetus.kundera.KunderaException;
import com.impetus.kundera.metadata.model.EntityMetadata;
import com.impetus.kundera.metadata.model.MetamodelImpl;
import com.impetus.kundera.metadata.model.attributes.AbstractAttribute;
import com.impetus.kundera.metadata.model.type.AbstractManagedType;
import com.impetus.kundera.persistence.EntityManagerFactoryImpl.KunderaMetadata;
import com.impetus.kundera.property.PropertyAccessorFactory;
/**
*
* @author Amit Kumar
*/
public final class KunderaQueryUtils
{
/** the log used by this class. */
private static Logger logger = LoggerFactory.getLogger(KunderaQueryUtils.class);
/**
* Gets the where clause.
*
* @param jpqlExpression
* the jpql expression
* @return the where clause
*/
public static WhereClause getWhereClause(JPQLExpression jpqlExpression)
{
WhereClause whereClause = null;
if (hasWhereClause(jpqlExpression))
{
if (isSelectStatement(jpqlExpression))
{
whereClause = (WhereClause) ((SelectStatement) jpqlExpression.getQueryStatement()).getWhereClause();
}
else if (isUpdateStatement(jpqlExpression))
{
whereClause = (WhereClause) ((UpdateStatement) jpqlExpression.getQueryStatement()).getWhereClause();
}
if (isDeleteStatement(jpqlExpression))
{
whereClause = (WhereClause) ((DeleteStatement) jpqlExpression.getQueryStatement()).getWhereClause();
}
}
return whereClause;
}
/**
* Checks for where clause.
*
* @param jpqlExpression
* the jpql expression
* @return true, if successful
*/
public static boolean hasWhereClause(JPQLExpression jpqlExpression)
{
if (isSelectStatement(jpqlExpression))
{
return ((SelectStatement) jpqlExpression.getQueryStatement()).hasWhereClause();
}
else if (isUpdateStatement(jpqlExpression))
{
return ((UpdateStatement) jpqlExpression.getQueryStatement()).hasWhereClause();
}
if (isDeleteStatement(jpqlExpression))
{
return ((DeleteStatement) jpqlExpression.getQueryStatement()).hasWhereClause();
}
return false;
}
/**
* Checks for group by.
*
* @param jpqlExpression
* the jpql expression
* @return true, if successful
*/
public static boolean hasGroupBy(JPQLExpression jpqlExpression)
{
if (isSelectStatement(jpqlExpression))
{
return ((SelectStatement) jpqlExpression.getQueryStatement()).hasGroupByClause();
}
return false;
}
/**
* Checks for having.
*
* @param jpqlExpression
* the jpql expression
* @return true, if successful
*/
public static boolean hasHaving(JPQLExpression jpqlExpression)
{
if (isSelectStatement(jpqlExpression))
{
return ((SelectStatement) jpqlExpression.getQueryStatement()).hasHavingClause();
}
return false;
}
/**
* Checks for order by.
*
* @param jpqlExpression
* the jpql expression
* @return true, if successful
*/
public static boolean hasOrderBy(JPQLExpression jpqlExpression)
{
if (isSelectStatement(jpqlExpression))
{
return ((SelectStatement) jpqlExpression.getQueryStatement()).hasOrderByClause();
}
return false;
}
/**
* Checks if is select statement.
*
* @param jpqlExpression
* the jpql expression
* @return true, if is select statement
*/
public static boolean isSelectStatement(JPQLExpression jpqlExpression)
{
return jpqlExpression.getQueryStatement().getClass().isAssignableFrom(SelectStatement.class);
}
/**
* Checks if is delete statement.
*
* @param jpqlExpression
* the jpql expression
* @return true, if is delete statement
*/
public static boolean isDeleteStatement(JPQLExpression jpqlExpression)
{
return jpqlExpression.getQueryStatement().getClass().isAssignableFrom(DeleteStatement.class);
}
/**
* Checks if is update statement.
*
* @param jpqlExpression
* the jpql expression
* @return true, if is update statement
*/
public static boolean isUpdateStatement(JPQLExpression jpqlExpression)
{
return jpqlExpression.getQueryStatement().getClass().isAssignableFrom(UpdateStatement.class);
}
/**
* Checks if is aggregated expression.
*
* @param expression
* the expression
* @return true, if is aggregated expression
*/
public static boolean isAggregatedExpression(Expression expression)
{
return AggregateFunction.class.isAssignableFrom(expression.getClass());
}
/**
* Gets the value.
*
* @param exp
* the exp
* @param clazz
* the clazz
* @return the value
*/
public static Object getValue(Expression exp, Class clazz, KunderaQuery kunderaQuery)
{
if (StringLiteral.class.isAssignableFrom(exp.getClass()))
{
return ((StringLiteral) exp).getUnquotedText();
}
else if (NumericLiteral.class.isAssignableFrom(exp.getClass()))
{
return PropertyAccessorFactory.getPropertyAccessor(clazz).fromString(clazz,
((NumericLiteral) exp).getText());
}
else if (InputParameter.class.isAssignableFrom(exp.getClass()))
{
InputParameter ip = (InputParameter) exp;
if (kunderaQuery.getParametersMap().containsKey(ip.getParameter()))
{
return kunderaQuery.getParametersMap().get(ip.getParameter());
}
else
{
return ip.getParameter();
}
}
else if (KeywordExpression.class.isAssignableFrom(exp.getClass()))
{
KeywordExpression keyWordExp = (KeywordExpression) exp;
return PropertyAccessorFactory.getPropertyAccessor(clazz).fromString(clazz,
keyWordExp.getActualIdentifier());
}
else if (IdentificationVariable.class.isAssignableFrom(exp.getClass()))
{
IdentificationVariable idvExp = (IdentificationVariable) exp;
return idvExp.getText();
}
else
{
logger.warn("Arithmetic expression is not supported ");
throw new KunderaException("Arithmetic expression is not supported currently");
}
}
/**
* Adds the to output columns.
*
* @param selectExpression
* the select expression
* @param m
* the m
* @param columnsToOutput
* the columns to output
*/
private static void addToOutputColumns(Expression selectExpression, EntityMetadata m,
List> columnsToOutput, KunderaMetadata kunderaMetadata)
{
Map map = setFieldClazzAndColumnFamily(selectExpression, m, kunderaMetadata);
columnsToOutput.add(map);
}
/**
* Read select clause.
*
* @param selectExpression
* the select expression
* @param m
* the m
* @param useLuceneOrES
* the use lucene or es
* @param kunderaMetadata
* @return the list
*/
public static List> readSelectClause(Expression selectExpression, EntityMetadata m,
Boolean useLuceneOrES, KunderaMetadata kunderaMetadata)
{
List> columnsToOutput = new ArrayList>();
if (StateFieldPathExpression.class.isAssignableFrom(selectExpression.getClass()))
{
StateFieldPathExpression sfpExp = (StateFieldPathExpression) selectExpression;
addToOutputColumns(selectExpression, m, columnsToOutput, kunderaMetadata);
}
else if (CollectionExpression.class.isAssignableFrom(selectExpression.getClass()))
{
CollectionExpression collExp = (CollectionExpression) selectExpression;
ListIterator itr = collExp.children().iterator();
while (itr.hasNext())
{
Expression exp = itr.next();
if (StateFieldPathExpression.class.isAssignableFrom(exp.getClass()))
{
addToOutputColumns(exp, m, columnsToOutput, kunderaMetadata);
}
}
}
return columnsToOutput;
}
/**
* Sets the fieldclazz and colfamily.
*
* @param expression
* the expression
* @param m
* the m
* @return the map
*/
public static Map setFieldClazzAndColumnFamily(Expression expression, EntityMetadata m,
final KunderaMetadata kunderaMetadata)
{
StateFieldPathExpression sfpExp = (StateFieldPathExpression) expression;
MetamodelImpl metaModel = (MetamodelImpl) kunderaMetadata.getApplicationMetadata().getMetamodel(
m.getPersistenceUnit());
EntityType entity = metaModel.entity(m.getEntityClazz());
String discriminatorColumn = ((AbstractManagedType) entity).getDiscriminatorColumn();
Class fieldClazz = String.class;
String colFamily = m.getTableName();
String colName = null;
String dbColName = null;
Map map = new HashMap();
boolean isEmbeddable = false;
int count = 1;
String fieldName = sfpExp.getPath(count++);
AbstractAttribute attrib = (AbstractAttribute) entity.getAttribute(fieldName);
isEmbeddable = metaModel.isEmbeddable(attrib.getBindableJavaType());
while (sfpExp.pathSize() > count)
{
if (isEmbeddable)
{
EmbeddableType embeddableType = metaModel.embeddable(attrib.getBindableJavaType());
String attName = sfpExp.getPath(count++);
fieldName = fieldName + "." + attName;
attrib = (AbstractAttribute) embeddableType.getAttribute(attName);
isEmbeddable = metaModel.isEmbeddable(attrib.getBindableJavaType());
}
colName = fieldName;
}
if (!sfpExp.getPath(count - 1).equals(discriminatorColumn))
{
fieldClazz = attrib.getBindableJavaType();
colFamily = attrib.getTableName() != null ? attrib.getTableName() : m.getTableName();
dbColName = attrib.getJPAColumnName();
colName = colName != null ? colName : attrib.getJPAColumnName();
}
map.put(Constants.FIELD_CLAZZ, fieldClazz);
map.put(Constants.COL_FAMILY, colFamily);
map.put(Constants.COL_NAME, colName);
map.put(Constants.FIELD_NAME, fieldName);
map.put(Constants.IS_EMBEDDABLE, isEmbeddable);
map.put(Constants.DB_COL_NAME, dbColName);
return map;
}
/**
* Traverse.
*
* @param expression
* the expression
* @param m
* the m
* @param idColumn
* the id column
* @return the filter
*/
public static void traverse(Expression expression, EntityMetadata m, KunderaMetadata kunderaMetadata,
KunderaQuery kunderaQuery, boolean isSubExpression)
{
if (ComparisonExpression.class.isAssignableFrom(expression.getClass()))
{
onComparisonExpression(expression, m, kunderaMetadata, kunderaQuery);
}
else if (LogicalExpression.class.isAssignableFrom(expression.getClass()))
{
onLogicalExpression(expression, m, kunderaMetadata, kunderaQuery);
}
else if (InExpression.class.isAssignableFrom(expression.getClass()))
{
onInExpression(expression, m, kunderaMetadata, kunderaQuery);
}
else if (LikeExpression.class.isAssignableFrom(expression.getClass()))
{
onLikeExpression(expression, m, kunderaMetadata, kunderaQuery);
}
else if (BetweenExpression.class.isAssignableFrom(expression.getClass()))
{
onBetweenExpression(expression, m, kunderaMetadata, kunderaQuery);
}
else if (SubExpression.class.isAssignableFrom(expression.getClass()))
{
onSubExpression(expression, m, kunderaMetadata, kunderaQuery);
}
}
/**
* @param expression
* @param m
* @param kunderaMetadata
* @param kunderaQuery
*/
public static void onSubExpression(Expression expression, EntityMetadata m, KunderaMetadata kunderaMetadata,
KunderaQuery kunderaQuery)
{
kunderaQuery.addFilterClause("(");
traverse(((SubExpression) expression).getExpression(), m, kunderaMetadata, kunderaQuery, true);
kunderaQuery.addFilterClause(")");
}
/**
* @param expression
* @param m
* @param kunderaMetadata
* @param kunderaQuery
* @return
*/
public static Map onBetweenExpression(Expression expression, EntityMetadata m,
KunderaMetadata kunderaMetadata, KunderaQuery kunderaQuery)
{
BetweenExpression betweenExp = (BetweenExpression) expression;
StateFieldPathExpression sfpExp = (StateFieldPathExpression) betweenExp.getExpression();
Map map = KunderaQueryUtils.setFieldClazzAndColumnFamily(sfpExp, m, kunderaMetadata);
String columnName = (String) map.get(Constants.COL_NAME);
String fieldName = (String) map.get(Constants.FIELD_NAME);
kunderaQuery.addFilterClause(columnName, Expression.GREATER_THAN_OR_EQUAL, betweenExp.getLowerBoundExpression()
.toActualText(), fieldName);
kunderaQuery.addFilterClause("AND");
kunderaQuery.addFilterClause(columnName, Expression.LOWER_THAN_OR_EQUAL, betweenExp.getUpperBoundExpression()
.toActualText(), fieldName);
return map;
}
/**
* @param expression
* @param m
* @param kunderaMetadata
* @param kunderaQuery
* @return
*/
public static Map onLikeExpression(Expression expression, EntityMetadata m,
KunderaMetadata kunderaMetadata, KunderaQuery kunderaQuery)
{
LikeExpression likeExp = (LikeExpression) expression;
StateFieldPathExpression sfpExp = (StateFieldPathExpression) likeExp.getStringExpression();
Map map = KunderaQueryUtils.setFieldClazzAndColumnFamily(sfpExp, m, kunderaMetadata);
kunderaQuery.addFilterClause((String) map.get(Constants.COL_NAME), likeExp.getIdentifier(), likeExp
.getPatternValue().toActualText(), (String) map.get(Constants.FIELD_NAME));
return map;
}
/**
* On logical expression.
*
* @param expression
* the expression
* @param m
* the m
* @param idColumn
* the id column
* @return the filter
*/
public static void onLogicalExpression(Expression expression, EntityMetadata m, KunderaMetadata kunderaMetadata,
KunderaQuery kunderaQuery)
{
traverse(((LogicalExpression) expression).getLeftExpression(), m, kunderaMetadata, kunderaQuery, false);
kunderaQuery.addFilterClause(((LogicalExpression) expression).getIdentifier());
traverse(((LogicalExpression) expression).getRightExpression(), m, kunderaMetadata, kunderaQuery, false);
}
/**
* On in expression.
*
* @param expression
* the expression
* @param m
* the m
* @param idColumn
* the id column
* @param isIdColumn
* the is id column
* @return
* @return the filter
*/
public static Map onInExpression(Expression expression, EntityMetadata m,
KunderaMetadata kunderaMetadata, KunderaQuery kunderaQuery)
{
InExpression inExp = (InExpression) expression;
StateFieldPathExpression sfpExp = (StateFieldPathExpression) inExp.getExpression();
Map map = KunderaQueryUtils.setFieldClazzAndColumnFamily(sfpExp, m, kunderaMetadata);
kunderaQuery.addFilterClause((String) map.get(Constants.COL_NAME), inExp.getIdentifier(), inExp.getInItems(),
(String) map.get(Constants.FIELD_NAME));
return map;
}
/**
* On comparison expression.
*
* @param expression
* the expression
* @param m
* the m
* @param idColumn
* the id column
* @param isIdColumn
* the is id column
* @return
* @return the filter
*/
public static Map onComparisonExpression(Expression expression, EntityMetadata m,
KunderaMetadata kunderaMetadata, KunderaQuery kunderaQuery)
{
ComparisonExpression compExp = (ComparisonExpression) expression;
String condition = compExp.getIdentifier();
StateFieldPathExpression sfpExp = (StateFieldPathExpression) compExp.getLeftExpression();
Map map = KunderaQueryUtils.setFieldClazzAndColumnFamily(sfpExp, m, kunderaMetadata);
Object value = KunderaQueryUtils.getValue(compExp.getRightExpression(), (Class) map.get(Constants.FIELD_CLAZZ),
kunderaQuery);
kunderaQuery.addFilterClause((String) map.get(Constants.COL_NAME), condition, value,
(String) map.get(Constants.FIELD_NAME));
return map;
}
}
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