Examples of org.eclipse.persistence.expressions.Expression

Package org.eclipse.persistence.expressions

Examples of org.eclipse.persistence.expressions.Expression

org.eclipse.persistence.expressions.Expression
Purpose: Define an object-level representation of a database query where clause.

Description: An expression is a tree-like structure that defines the selection criteria for a query against objects in the database. The expression has the advantage over SQL by being at the object-level, i.e. the object model attributes and relationships can be used to be query on instead of the database field names. Because it is an object, not a string the expression has the advantage that is can be easily manipulated through code to easily build complex selection criterias.

Responsibilities:
- Store the selection criteria in a tree-like structure.
- Support public manipulation protocols for all comparison and function operators.
- Use opperator overloading to support all primitive types as well as objects.

            return false;
        }
        if (! ((this.referenceClass == query.referenceClass) || ((this.referenceClass != null) && this.referenceClass.equals(query.referenceClass)))) {
            return false;
        }
        Expression selectionCriteria = getSelectionCriteria();
        Expression otherSelectionCriteria = query.getSelectionCriteria();
        return ((selectionCriteria == otherSelectionCriteria) || ((selectionCriteria != null) && selectionCriteria.equals(otherSelectionCriteria)));
    }

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        }
        int hashCode = 32;
        if (this.referenceClass != null) {
            hashCode = hashCode + this.referenceClass.hashCode();
        }
        Expression selectionCriteria = getSelectionCriteria();
        if (selectionCriteria != null) {
            hashCode = hashCode + selectionCriteria.hashCode();
        }
        return hashCode;
    }

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            localFields.addElement(getDescriptor().getInheritancePolicy().getClassIndicatorField());
        }


        //Add attribute fields
        for(Iterator it = getPartialAttributeExpressions().iterator();it.hasNext();){
            Expression expression = (Expression)it.next();
            if (expression.isQueryKeyExpression()) {
                ((QueryKeyExpression)expression).getBuilder().setSession(session.getRootSession(null));
                ((QueryKeyExpression)expression).getBuilder().setQueryClass(getDescriptor().getJavaClass());
                DatabaseMapping mapping = ((QueryKeyExpression)expression).getMapping();
                if (!((QueryKeyExpression)expression).getBaseExpression().isExpressionBuilder()) {
                    if(foreignFields==null){
                        foreignFields = org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance();
                    }
                    if(!isCustomSQL){
                        foreignFields.add(expression);
                    }else{
                        foreignFields.addAll(expression.getFields());
                    }
                }else{
                    if (mapping == null) {
                        throw QueryException.specifiedPartialAttributeDoesNotExist(this, expression.getName(), descriptor.getJavaClass().getName());
                    }
                    if(mapping.isForeignReferenceMapping() ){
                        if(foreignFields==null){
                            foreignFields = org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance();
                        }
                        if(!isCustomSQL){
                            foreignFields.add(expression);
                        }else{
                            foreignFields.addAll(expression.getFields());
                        }
                    }else{
                        localFields.addAll(expression.getFields());
                    }
                }
            } else {
                throw QueryException.expressionDoesNotSupportPartialAttributeReading(expression);
            }

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        }


        // Validate and prepare partial attribute expressions.
        if (hasPartialAttributeExpressions()) {
            for (int index = 0; index < getPartialAttributeExpressions().size(); index++) {
                Expression expression = getPartialAttributeExpressions().get(index);


                // Search if any of the expression traverse a 1-m.
                while (expression.isQueryKeyExpression() && (!expression.isExpressionBuilder())) {
                    if (((QueryKeyExpression)expression).shouldQueryToManyRelationship()) {
                      getJoinedAttributeManager().setIsToManyJoinQuery(true);
                    }
                    expression = ((QueryKeyExpression)expression).getBaseExpression();
                }

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                }
          }
          ReadObjectQuery roq = new ReadObjectQuery();
          String generatedJavaClassName = getGeneratedJavaClassName(tableName);
          roq.setReferenceClassName(generatedJavaClassName);
          Expression expression = null;
          Expression builder = new ExpressionBuilder();
          Expression subExp1;
          Expression subExp2;
          Expression subExpression;
          List<DatabaseField> primaryKeyFields = desc.getPrimaryKeyFields();
          for (int index = 0; index < primaryKeyFields.size(); index++) {
              DatabaseField primaryKeyField = primaryKeyFields.get(index);
              subExp1 = builder.getField(primaryKeyField);
              subExp2 = builder.getParameter(primaryKeyField.getName().toLowerCase());

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                }
                // ignore the first token since we are assuming read all query
                // e.g. In e.phoneNumbers we will assume "e" refers to the base of the query
                String previousToken = tokenizer.nextToken();
                ClassDescriptor descriptor = raq.getDescriptor();
                Expression expression = raq.getExpressionBuilder();
                while (tokenizer.hasMoreTokens()){
                    String token = tokenizer.nextToken();
                    ForeignReferenceMapping frMapping = null;
                    DatabaseMapping mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                    if (mapping == null){
                        throw QueryException.queryHintNavigatedNonExistantRelationship(query, QueryHints.BATCH, valueToApply, previousToken + "." + token);
                    } else if (!mapping.isForeignReferenceMapping()){
                        throw QueryException.queryHintNavigatedIllegalRelationship(query, QueryHints.BATCH, valueToApply, previousToken + "." + token);
                    } else {
                        frMapping = (ForeignReferenceMapping)mapping;
                    }
                    descriptor = frMapping.getReferenceDescriptor();
                    if (frMapping.isCollectionMapping()){
                        expression = expression.anyOf(token);
                    } else {
                        expression = expression.get(token);
                    }
                    previousToken = token;
                }
                raq.addBatchReadAttribute(expression);
            } else {

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     * INTERNAL
     * @param context The generation context
     * @return An EclipseLink expression
     */
    public Expression generateExpression(GenerationContext context) {
        Expression whereClause = null;
        if (getLeft() != null) {
            whereClause = getLeft().generateExpression(context);
        }
        return whereClause;
    }

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                }
                // ignore the first token since we are assuming read all query
                // e.g. In e.phoneNumbers we will assume "e" refers to the base of the query
                String previousToken = tokenizer.nextToken();
                ClassDescriptor descriptor = olrq.getDescriptor();
                Expression expression = olrq.getExpressionBuilder();
                while (tokenizer.hasMoreTokens()){
                    String token = tokenizer.nextToken();
                    ForeignReferenceMapping frMapping = null;
                    DatabaseMapping mapping = descriptor.getObjectBuilder().getMappingForAttributeName(token);
                    if (mapping == null){
                        throw QueryException.queryHintNavigatedNonExistantRelationship(query, QueryHints.FETCH, valueToApply, previousToken + "." + token);
                    } else if (!mapping.isForeignReferenceMapping()){
                        throw QueryException.queryHintNavigatedIllegalRelationship(query, QueryHints.FETCH, valueToApply, previousToken + "." + token);
                    } else {
                        frMapping = (ForeignReferenceMapping)mapping;
                    }
                    descriptor = frMapping.getReferenceDescriptor();
                    if (frMapping.isCollectionMapping()){
                        expression = expression.anyOf(token);
                    } else {
                        expression = expression.get(token);
                    }
                    previousToken = token;
                }
                olrq.addJoinedAttribute(expression);
            } else {

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        if (getBaseQuery().hasPartialAttributeExpressions()) {
            fieldIndex = getDescriptor().getPrimaryKeyFields().size(); // Query will select pks
            //next check for any partial attributes that are not joined attributes
            Iterator partialAttributes = ((ObjectLevelReadQuery)getBaseQuery()).getPartialAttributeExpressions().iterator();
            while(partialAttributes.hasNext()){
                Expression expression = (Expression)partialAttributes.next();
                if (expression.isQueryKeyExpression()){
                    if (!getJoinedMappingExpressions().contains(expression) && ! getJoinedAttributeExpressions().contains(expression)){
                        fieldIndex += ((QueryKeyExpression)expression).getFields().size();
                    }
                }
            }

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     * Validate and prepare join expressions.
     */
    public void prepareJoinExpressions(AbstractSession session) {
        // The prepareJoinExpression check for outer-joins to set this to true.
        setIsOuterJoinedAttributeQuery(false);
        Expression lastJoinedAttributeBaseExpression = null;
        List groupedExpressionList = new ArrayList(getJoinedAttributeExpressions().size());
        for (int index = 0; index < getJoinedAttributeExpressions().size(); index++) {
            Expression expression = getJoinedAttributeExpressions().get(index);
            expression = prepareJoinExpression(expression, session);
            //EL bug 307497: break base expressions out onto the list and sort/group expressions by base expression  
            lastJoinedAttributeBaseExpression = addExpressionAndBaseToGroupedList(expression, groupedExpressionList, lastJoinedAttributeBaseExpression);
        }
        //use the grouped list instead of the original
        this.setJoinedAttributeExpressions_(groupedExpressionList);
        for (int index = 0; index < getJoinedMappingExpressions().size(); index++) {
            Expression expression = getJoinedMappingExpressions().get(index);
            expression = prepareJoinExpression(expression, session);
            getJoinedMappingExpressions().set(index, expression);
        }
    }

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