Examples with NullExpression com.blazebit.persistence.parser.expression.NullExpression used on opensource projects

Example 1 with NullExpression

use of com.blazebit.persistence.parser.expression.NullExpression in project blaze-persistence by Blazebit.

the class JpaUtils method expandBindings.

public static void expandBindings(Map<String, Integer> bindingMap, Map<String, String> columnBindingMap, Map<String, ExtendedAttribute<?, ?>> attributeEntries, ClauseType clause, AbstractCommonQueryBuilder<?, ?, ?, ?, ?> queryBuilder, String keyFunctionExpression, boolean enableElementCollectionIdCutoff) {
    SelectManager<?> selectManager = queryBuilder.selectManager;
    JoinManager joinManager = queryBuilder.joinManager;
    ParameterManager parameterManager = queryBuilder.parameterManager;
    JpaProvider jpaProvider = queryBuilder.mainQuery.jpaProvider;
    EntityMetamodelImpl metamodel = queryBuilder.mainQuery.metamodel;
    boolean requiresNullCast = queryBuilder.mainQuery.dbmsDialect.requiresNullCast();
    boolean needsCastParameters = queryBuilder.mainQuery.dbmsDialect.needsCastParameters();
    JpaMetamodelAccessor jpaMetamodelAccessor = jpaProvider.getJpaMetamodelAccessor();
    boolean needsElementCollectionIdCutoff = enableElementCollectionIdCutoff && jpaProvider.needsElementCollectionIdCutoff();
    final Queue<String> attributeQueue = new ArrayDeque<>(bindingMap.keySet());
    while (!attributeQueue.isEmpty()) {
        final String attributeName = attributeQueue.remove();
        Integer tupleIndex = bindingMap.get(attributeName);
        Class<?> elementType;
        String columnType;
        boolean splitExpression;
        ExtendedAttribute<?, ?> attributeEntry = attributeEntries.get(attributeName);
        if (attributeEntry == null) {
            if (!attributeName.equalsIgnoreCase(keyFunctionExpression)) {
                continue;
            }
            String realAttributeName = attributeName.substring(attributeName.indexOf('(') + 1, attributeName.length() - 1);
            attributeEntry = attributeEntries.get(realAttributeName);
            if (attributeEntry.getAttribute() instanceof ListAttribute<?, ?>) {
                elementType = Integer.class;
                columnType = queryBuilder.mainQuery.dbmsDialect.getSqlType(Integer.class);
            } else {
                MapAttribute<?, ?, ?> mapAttribute = (MapAttribute<?, ?, ?>) attributeEntry.getAttribute();
                elementType = mapAttribute.getKeyJavaType();
                columnType = attributeEntry.getJoinTable() != null && attributeEntry.getJoinTable().getKeyColumnTypes() != null && attributeEntry.getJoinTable().getKeyColumnTypes().size() == 1 ? attributeEntry.getJoinTable().getKeyColumnTypes().values().iterator().next() : null;
            }
            splitExpression = false;
        } else {
            elementType = attributeEntry.getElementClass();
            columnType = attributeEntry.getColumnTypes().length == 0 ? null : attributeEntry.getColumnTypes()[0];
            final List<Attribute<?, ?>> attributePath = attributeEntry.getAttributePath();
            final Attribute<?, ?> lastAttribute = attributePath.get(attributePath.size() - 1);
            splitExpression = lastAttribute.getPersistentAttributeType() == Attribute.PersistentAttributeType.EMBEDDED;
            if (!splitExpression) {
                if ((clause != ClauseType.SET || jpaProvider.supportsUpdateSetAssociationId()) && jpaMetamodelAccessor.isJoinable(lastAttribute) && !isBasicElementType(lastAttribute)) {
                    splitExpression = true;
                    if (needsElementCollectionIdCutoff) {
                        OUTER: for (int i = 0; i < attributePath.size() - 1; i++) {
                            Attribute<?, ?> attribute = attributePath.get(i);
                            if (attribute.getPersistentAttributeType() == Attribute.PersistentAttributeType.ELEMENT_COLLECTION) {
                                // This is a special case, when an embeddable is between an element collection and the association, we still need to split the expression
                                for (int j = i + 1; j < attributePath.size() - 1; j++) {
                                    attribute = attributePath.get(j);
                                    if (attribute.getPersistentAttributeType() == Attribute.PersistentAttributeType.EMBEDDED) {
                                        break OUTER;
                                    }
                                }
                                splitExpression = false;
                                break;
                            }
                        }
                    }
                }
            }
        }
        SelectInfo selectInfo = selectManager.getSelectInfos().get(tupleIndex);
        final Expression selectExpression = selectInfo.getExpression();
        if (splitExpression) {
            // TODO: Maybe also allow Treat, Case-When, Array?
            if (selectExpression instanceof NullExpression) {
                final Collection<String> embeddedPropertyNames = getEmbeddedPropertyPaths(attributeEntries, attributeName, needsElementCollectionIdCutoff, false);
                if (embeddedPropertyNames.size() > 0) {
                    selectManager.getSelectInfos().remove(tupleIndex.intValue());
                    bindingMap.remove(attributeName);
                    // We are going to insert the expanded attributes as new select items and shift existing ones
                    int delta = embeddedPropertyNames.size() - 1;
                    if (delta > 0) {
                        for (Map.Entry<String, Integer> entry : bindingMap.entrySet()) {
                            if (entry.getValue() > tupleIndex) {
                                entry.setValue(entry.getValue() + delta);
                            }
                        }
                    }
                    int offset = 0;
                    for (String embeddedPropertyName : embeddedPropertyNames) {
                        String nestedAttributePath = attributeName + "." + embeddedPropertyName;
                        ExtendedAttribute<?, ?> nestedAttributeEntry = attributeEntries.get(nestedAttributePath);
                        // Process the nested attribute path recursively
                        attributeQueue.add(nestedAttributePath);
                        // Replace this binding in the binding map, additional selects need an updated index
                        bindingMap.put(nestedAttributePath, tupleIndex + offset);
                        selectManager.select(offset == 0 ? selectExpression : selectExpression.copy(ExpressionCopyContext.EMPTY), null, tupleIndex + offset);
                        if (columnBindingMap != null) {
                            for (String column : nestedAttributeEntry.getColumnNames()) {
                                columnBindingMap.put(column, nestedAttributePath);
                            }
                        }
                        offset++;
                    }
                }
            } else if (selectExpression instanceof PathExpression) {
                boolean firstBinding = true;
                final Collection<String> embeddedPropertyNames = getEmbeddedPropertyPaths(attributeEntries, attributeName, needsElementCollectionIdCutoff, false);
                PathExpression baseExpression = embeddedPropertyNames.size() > 1 ? ((PathExpression) selectExpression).copy(ExpressionCopyContext.EMPTY) : ((PathExpression) selectExpression);
                joinManager.implicitJoin(baseExpression, true, true, true, null, ClauseType.SELECT, new HashSet<String>(), false, false, false, false);
                if (elementType != baseExpression.getPathReference().getType().getJavaType()) {
                    throw new IllegalStateException("An association should be bound to its association type and not its identifier type");
                }
                if (embeddedPropertyNames.size() > 0) {
                    bindingMap.remove(attributeName);
                    // We are going to insert the expanded attributes as new select items and shift existing ones
                    int delta = embeddedPropertyNames.size() - 1;
                    if (delta > 0) {
                        for (Map.Entry<String, Integer> entry : bindingMap.entrySet()) {
                            if (entry.getValue() > tupleIndex) {
                                entry.setValue(entry.getValue() + delta);
                            }
                        }
                    }
                    int offset = 0;
                    for (String embeddedPropertyName : embeddedPropertyNames) {
                        PathExpression pathExpression = firstBinding ? ((PathExpression) selectExpression) : baseExpression.copy(ExpressionCopyContext.EMPTY);
                        for (String propertyNamePart : embeddedPropertyName.split("\\.")) {
                            pathExpression.getExpressions().add(new PropertyExpression(propertyNamePart));
                        }
                        String nestedAttributePath = attributeName + "." + embeddedPropertyName;
                        ExtendedAttribute<?, ?> nestedAttributeEntry = attributeEntries.get(nestedAttributePath);
                        // Process the nested attribute path recursively
                        attributeQueue.add(nestedAttributePath);
                        // Replace this binding in the binding map, additional selects need an updated index
                        bindingMap.put(nestedAttributePath, firstBinding ? tupleIndex : tupleIndex + offset);
                        if (!firstBinding) {
                            selectManager.select(pathExpression, null, tupleIndex + offset);
                        } else {
                            firstBinding = false;
                        }
                        if (columnBindingMap != null) {
                            for (String column : nestedAttributeEntry.getColumnNames()) {
                                columnBindingMap.put(column, nestedAttributePath);
                            }
                        }
                        offset++;
                    }
                }
            } else if (selectExpression instanceof ParameterExpression) {
                final Collection<String> embeddedPropertyNames = getEmbeddedPropertyPaths(attributeEntries, attributeName, jpaProvider.needsElementCollectionIdCutoff(), false);
                if (embeddedPropertyNames.size() > 0) {
                    ParameterExpression parameterExpression = (ParameterExpression) selectExpression;
                    String parameterName = parameterExpression.getName();
                    Map<String, List<String>> parameterAccessPaths = new HashMap<>(embeddedPropertyNames.size());
                    ParameterValueTransformer tranformer = parameterManager.getParameter(parameterName).getTransformer();
                    if (tranformer instanceof SplittingParameterTransformer) {
                        for (String name : ((SplittingParameterTransformer) tranformer).getParameterNames()) {
                            parameterManager.unregisterParameterName(name, clause, queryBuilder);
                        }
                    }
                    selectManager.getSelectInfos().remove(tupleIndex.intValue());
                    bindingMap.remove(attributeName);
                    // We are going to insert the expanded attributes as new select items and shift existing ones
                    int delta = embeddedPropertyNames.size() - 1;
                    if (delta > 0) {
                        for (Map.Entry<String, Integer> entry : bindingMap.entrySet()) {
                            if (entry.getValue() > tupleIndex) {
                                entry.setValue(entry.getValue() + delta);
                            }
                        }
                    }
                    int offset = 0;
                    for (String embeddedPropertyName : embeddedPropertyNames) {
                        String subParamName = "_" + parameterName + "_" + embeddedPropertyName.replace('.', '_');
                        parameterManager.registerParameterName(subParamName, false, clause, queryBuilder);
                        parameterAccessPaths.put(subParamName, Arrays.asList(embeddedPropertyName.split("\\.")));
                        String nestedAttributePath = attributeName + "." + embeddedPropertyName;
                        ExtendedAttribute<?, ?> nestedAttributeEntry = attributeEntries.get(nestedAttributePath);
                        // Process the nested attribute path recursively
                        attributeQueue.add(nestedAttributePath);
                        // Replace this binding in the binding map, additional selects need an updated index
                        bindingMap.put(nestedAttributePath, tupleIndex + offset);
                        selectManager.select(new ParameterExpression(subParamName), null, tupleIndex + offset);
                        if (columnBindingMap != null) {
                            for (String column : nestedAttributeEntry.getColumnNames()) {
                                columnBindingMap.put(column, nestedAttributePath);
                            }
                        }
                        offset++;
                    }
                    parameterManager.getParameter(parameterName).setTransformer(new SplittingParameterTransformer(parameterManager, metamodel, elementType, parameterAccessPaths));
                }
            } else {
                throw new IllegalArgumentException("Illegal expression '" + selectExpression.toString() + "' for binding relation '" + attributeName + "'!");
            }
        } else if (requiresNullCast && selectExpression instanceof NullExpression) {
            if (BasicCastTypes.TYPES.contains(elementType) && queryBuilder.statementType != DbmsStatementType.INSERT) {
                // We also need a cast for parameter expressions except in the SET clause
                List<Expression> arguments = new ArrayList<>(2);
                arguments.add(selectExpression);
                if (columnType != null) {
                    arguments.add(new StringLiteral(columnType));
                }
                selectInfo.set(new FunctionExpression("CAST_" + elementType.getSimpleName(), arguments, selectExpression));
            } else {
                final EntityMetamodelImpl.AttributeExample attributeExample = metamodel.getBasicTypeExampleAttributes().get(elementType);
                if (attributeExample != null) {
                    List<Expression> arguments = new ArrayList<>(2);
                    arguments.add(new SubqueryExpression(new Subquery() {

                        @Override
                        public String getQueryString() {
                            return attributeExample.getExampleJpql() + selectExpression;
                        }
                    }));
                    if (queryBuilder.statementType != DbmsStatementType.INSERT && needsCastParameters) {
                        arguments.add(new StringLiteral(attributeExample.getAttribute().getColumnTypes()[0]));
                    }
                    selectInfo.set(new FunctionExpression(NullfnFunction.FUNCTION_NAME, arguments, selectExpression));
                }
            }
        } else if (selectExpression instanceof ParameterExpression && clause != ClauseType.SET) {
            if (BasicCastTypes.TYPES.contains(elementType) && queryBuilder.statementType != DbmsStatementType.INSERT) {
                // We also need a cast for parameter expressions except in the SET clause
                List<Expression> arguments = new ArrayList<>(2);
                arguments.add(selectExpression);
                if (columnType != null) {
                    arguments.add(new StringLiteral(columnType));
                }
                selectInfo.set(new FunctionExpression("CAST_" + elementType.getSimpleName(), arguments, selectExpression));
            } else {
                final EntityMetamodelImpl.AttributeExample attributeExample = metamodel.getBasicTypeExampleAttributes().get(elementType);
                if (attributeExample != null) {
                    List<Expression> arguments = new ArrayList<>(2);
                    arguments.add(new SubqueryExpression(new Subquery() {

                        @Override
                        public String getQueryString() {
                            return attributeExample.getExampleJpql() + selectExpression;
                        }
                    }));
                    if (queryBuilder.statementType != DbmsStatementType.INSERT && needsCastParameters) {
                        arguments.add(new StringLiteral(attributeExample.getAttribute().getColumnTypes()[0]));
                    }
                    selectInfo.set(new FunctionExpression(ParamFunction.FUNCTION_NAME, arguments, selectExpression));
                }
            }
        }
    }
}

Example 2 with NullExpression

use of com.blazebit.persistence.parser.expression.NullExpression in project blaze-persistence by Blazebit.

the class TestLiterals method testNullLiteral.

@Test
public void testNullLiteral() {
    NullExpression result = (NullExpression) parse("NULL");
    assertEquals(new NullExpression(), result);
}