// 组装二元操作符
private Expression populateBinaryOperator(
BinaryOperatorImpl binaryOperator, Expression leftParameter, Expression rightParameter) {
if (leftParameter instanceof Variable && binaryOperator.isLeftOperandNamed())
leftParameter =
new ConstantImpl(
((Variable) leftParameter).getName(),
leftParameter.getLocation(),
evaluateInterceptors);
if (rightParameter instanceof Variable && binaryOperator.isRightOperandNamed())
rightParameter =
new ConstantImpl(
((Variable) rightParameter).getName(),
rightParameter.getLocation(),
evaluateInterceptors);
binaryOperator.setOperands(leftParameter, rightParameter);
try {
// 常量优化算法，将常量先计算，如：
// 2 * 3 + coins 将被优化为 6 + coins
// (注: 表达式应尽量把常量计算写在前面, 如: 24 * 60 * days, 而不要用 days * 24 * 60)
if (leftParameter instanceof Constant
&& rightParameter instanceof Constant
&& binaryOperator.isOptimize(
((Constant) leftParameter).getValue(), ((Constant) rightParameter).getValue()))
return new ConstantImpl(
binaryOperator.evaluate(null), binaryOperator.getLocation(), evaluateInterceptors);
} catch (Exception e) {
// 抛出任何异常都表示其不支持优化
}
return binaryOperator;
}
// 组装一元操作符
private Expression populateUnaryOperator(
UnaryOperatorImpl unaryOperator, Expression parameter) {
if (parameter instanceof Variable && unaryOperator.isOperandNamed())
parameter =
new ConstantImpl(
((Variable) parameter).getName(), parameter.getLocation(), evaluateInterceptors);
unaryOperator.setOperand(parameter);
try {
// 常量优化算法，将常量先计算，如：
// ! true 将被优化为 false
if (parameter instanceof Constant
&& unaryOperator.isOptimize(((Constant) parameter).getValue())
&& !(((Constant) parameter).getValue() instanceof Function)) // Function不优化
return new ConstantImpl(
unaryOperator.evaluate(null), unaryOperator.getLocation(), evaluateInterceptors);
} catch (Exception e) {
// 抛出任何异常都表示其不支持优化
}
return unaryOperator;
}
