Examples of org.eclipse.persistence.expressions.ExpressionBuilder

Package org.eclipse.persistence.expressions

Examples of org.eclipse.persistence.expressions.ExpressionBuilder

org.eclipse.persistence.expressions.ExpressionBuilder

Purpose: Allow for instances of expression to be created. Expressions are Java object-level representations of SQL "where" clauses. The expressions attempt to mirror Java code as closely as possible.

Example:

 ExpressionBuilder employee = new ExpressionBuilder(); employee.get("firstName").equal("Bob").and(employee.get("lastName").equal("Smith")) >> equivalent Java code: (employee.getFirstName().equals("Bob")) && (employee.getLastName().equals("Smith")) >> equivalent SQL: (F_NAME = 'Bob') AND (L_NAME = 'Smith')

@see Expression

          * Add an argument to the coalesce expression.
          * @param value  value
          * @return coalesce expression
          */
         public Coalesce<X> value(X value){
             org.eclipse.persistence.expressions.Expression exp = org.eclipse.persistence.expressions.Expression.from(value, new ExpressionBuilder());
             ((FunctionExpression)currentNode).addChild(exp);
             return this;
         }

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         */
        public Case<R> when(Expression<Boolean> condition, R result){
            org.eclipse.persistence.expressions.Expression conditionExp = ((InternalSelection)condition).getCurrentNode();
            conditionExp = org.eclipse.persistence.expressions.Expression.from(conditionExp, currentNode);
            ((FunctionExpression)currentNode).addChild(conditionExp);
            org.eclipse.persistence.expressions.Expression resultExp = org.eclipse.persistence.expressions.Expression.from(result, new ExpressionBuilder());
            ((FunctionExpression)currentNode).addChild(resultExp);
            return this;
        }

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         * Add an "else" clause to the case expression.
         * @param result  "else" result
         * @return expression
         */
        public Expression<R> otherwise(R result){
              org.eclipse.persistence.expressions.Expression resultExp = org.eclipse.persistence.expressions.Expression.from(result, new ExpressionBuilder());
            ((ArgumentListFunctionExpression)currentNode).addRightMostChild(resultExp);
            return this;
        }

View Full Code Here

         * @param condition  "when" condition
         * @param result  "then" result value
         * @return simple case expression
         */
        public SimpleCase<C, R> when(C condition, R result){
            org.eclipse.persistence.expressions.Expression conditionExp = org.eclipse.persistence.expressions.Expression.from(condition, new ExpressionBuilder());
            ((FunctionExpression)currentNode).addChild(conditionExp);
            org.eclipse.persistence.expressions.Expression resultExp = org.eclipse.persistence.expressions.Expression.from(result, new ExpressionBuilder());
            ((FunctionExpression)currentNode).addChild(resultExp);
            return this;
        }

View Full Code Here

         * @param condition  "when" condition
         * @param result  "then" result expression
         * @return simple case expression
         */
        public SimpleCase<C, R> when(C condition, Expression<? extends R> result){
            org.eclipse.persistence.expressions.Expression conditionExp = org.eclipse.persistence.expressions.Expression.from(condition, new ExpressionBuilder());
            ((FunctionExpression)currentNode).addChild(conditionExp);
            org.eclipse.persistence.expressions.Expression resultExp = ((InternalSelection)result).getCurrentNode();
            resultExp = org.eclipse.persistence.expressions.Expression.from(resultExp, currentNode);
            ((FunctionExpression)currentNode).addChild(resultExp);
            return this;

View Full Code Here

         * Add an "else" clause to the case expression.
         * @param result  "else" result
         * @return expression
         */
        public Expression<R> otherwise(R result){
            org.eclipse.persistence.expressions.Expression resultExp = org.eclipse.persistence.expressions.Expression.from(result, new ExpressionBuilder());
            ((ArgumentListFunctionExpression)currentNode).addRightMostChild(resultExp);
            return this;
        }

View Full Code Here

            this.subQuery.setReferenceClass(result);
        }
        this.subQuery.setDistinctState(ObjectLevelReadQuery.DONT_USE_DISTINCT);
        this.correlatedJoins = new HashSet();
        this.correlations = new HashSet();
        this.currentNode = new SubSelectExpression(subQuery, new ExpressionBuilder());
        this.parent = parent;
    }

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        return new MapJoinImpl(parentCollection.getParentPath(), metamodel.managedType(parentCollection.getModel().getBindableJavaType()), metamodel, parentCollection.getJavaType(), internalCorrelate((FromImpl) parentCollection), parentCollection.getModel(), parentCollection.getJoinType(), (FromImpl) parentCollection);
    }
    
    protected org.eclipse.persistence.expressions.Expression internalCorrelate(FromImpl from){
        org.eclipse.persistence.expressions.Expression expression = ((InternalSelection)from).getCurrentNode();
        ExpressionBuilder builder = new ExpressionBuilder(expression.getBuilder().getQueryClass());
        org.eclipse.persistence.expressions.Expression correlated = expression.rebuildOn(builder);
        expression = expression.equal(correlated);
        this.correlations.add(expression);
        org.eclipse.persistence.expressions.Expression selectionCriteria = expression.and(this.subQuery.getSelectionCriteria());
        this.subQuery.setSelectionCriteria(selectionCriteria);

View Full Code Here

     * 
     * @param subquery
     * @return all expression
     */
    public <Y> Expression<Y> all(Subquery<Y> subquery){
        return new FunctionExpressionImpl<Y>(metamodel, (Class<Y>) subquery.getJavaType(), new ExpressionBuilder().all(((InternalSelection)subquery).getCurrentNode()), buildList(subquery), "all");
    }

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     * 
     * @param subquery
     * @return all expression
     */
    public <Y> Expression<Y> some(Subquery<Y> subquery){
        return new FunctionExpressionImpl<Y>(metamodel, (Class<Y>) subquery.getJavaType(), new ExpressionBuilder().some(((InternalSelection)subquery).getCurrentNode()), buildList(subquery), "some");
    }

View Full Code Here

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