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

     * Create a coalesce expression.
     * 
     * @return coalesce expression
     */
    public <T> Coalesce<T> coalesce(){
        ArgumentListFunctionExpression coalesce = new ExpressionBuilder().coalesce();
        return new CoalesceImpl(metamodel, Object.class, coalesce, new ArrayList());
    }

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     * @param expression
     *            to be tested against the case conditions
     * @return simple case expression
     */
    public <C, R> SimpleCase<C, R> selectCase(Expression<? extends C> expression){
        ArgumentListFunctionExpression caseStatement = new ExpressionBuilder().caseStatement();
        return new SimpleCaseImpl(metamodel, Object.class, caseStatement, new ArrayList(), expression);
    }

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     * Create a general case expression.
     * 
     * @return general case expression
     */
    public <R> Case<R> selectCase(){
        ArgumentListFunctionExpression caseStatement = new ExpressionBuilder().caseConditionStatement();
        return new CaseImpl(metamodel, Object.class, caseStatement, new ArrayList());
    }

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            params.add(((InternalSelection)x).getCurrentNode());
        }
        
        return new FunctionExpressionImpl<T>(metamodel, type, ((InternalSelection)args[0]).getCurrentNode().getFunctionWithArguments(name, params), buildList(args), name);
        }else{
            return new FunctionExpressionImpl<T>(metamodel, type, new ExpressionBuilder().getFunction(name), new ArrayList(0), name);
        }
    }

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          * 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;
        }

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         * @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;
        }

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         * @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;

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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;
        }

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