Options.java

package com.googlecode.aviator;

import java.math.MathContext;


/**
 * Aviator Evaluator Configuration options.
 * 
 * @author dennis
 *
 */
public enum Options {
    /**
     * Always use double as BigDecimal, default is false.
     * 
     * @since 2.3.4
     */
    ALWAYS_USE_DOUBLE_AS_DECIMAL,

    /**
     * Optimize level, default is {@link AviatorEvaluator#EVA}
     * 
     * @see AviatorEvaluator#EVAL
     * @see AviatorEvaluator#COMPILE
     */
    OPTIMIZE_LEVEL,

    /**
     * Math context for decimal, default is {@link MathContext.DECIMAL128}
     * 
     * @see MathContext
     */
    MATH_CONTEXT,

    /**
     * Whether to trace code generation,default is false.
     */
    TRACE;

    public boolean isValidValue(Object val) {
        switch (this) {
        case ALWAYS_USE_DOUBLE_AS_DECIMAL:
        case TRACE:
            return val instanceof Boolean;
        case OPTIMIZE_LEVEL:
            return (val instanceof Integer)
                    && (((Integer) val).intValue() == AviatorEvaluator.EVAL || ((Integer) val).intValue() == AviatorEvaluator.COMPILE);
        case MATH_CONTEXT:
            return val instanceof MathContext;
        }
        return false;
    }


    /**
     * Returns the default value of option.
     * 
     * @return
     */
    public Object getDefaultValue() {
        switch (this) {
        case ALWAYS_USE_DOUBLE_AS_DECIMAL:
            return false;
        case OPTIMIZE_LEVEL:
            return AviatorEvaluator.EVAL;
        case MATH_CONTEXT:
            return MathContext.DECIMAL128;
        case TRACE:
            return Boolean.valueOf(System.getProperty("aviator.asm.trace", "false"));
        }
        return null;
    }
}