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allow basic expression calulation in craft amount gui (#141)
* cal expression in cca bar * crap * use big decimal as return when paras are string * remove double * all string
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package appeng.util.calculators; | ||
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| public class ArithHelper { | ||
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| private static final int DEF_DIV_SCALE = 16; | ||
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| private ArithHelper() { | ||
| } | ||
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| /** | ||
| * addition | ||
| * | ||
| * @param v1 p1 | ||
| * @param v2 p2 | ||
| * @return sum | ||
| */ | ||
| public static String add(String v1, String v2) { | ||
| java.math.BigDecimal b1 = new java.math.BigDecimal(v1); | ||
| java.math.BigDecimal b2 = new java.math.BigDecimal(v2); | ||
| return String.valueOf(b1.add(b2)); | ||
| } | ||
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| /** | ||
| * subtraction | ||
| * | ||
| * @param v1 p1 | ||
| * @param v2 p2 | ||
| * @return sub | ||
| */ | ||
| public static String sub(String v1, String v2) { | ||
| java.math.BigDecimal b1 = new java.math.BigDecimal(v1); | ||
| java.math.BigDecimal b2 = new java.math.BigDecimal(v2); | ||
| return String.valueOf(b1.subtract(b2)); | ||
| } | ||
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| /** | ||
| * multiplication | ||
| * | ||
| * @param v1 | ||
| * p1 | ||
| * @param v2 | ||
| * p2 | ||
| * @return mul | ||
| */ | ||
| public static String mul(String v1, String v2) { | ||
| java.math.BigDecimal b1 = new java.math.BigDecimal(v1); | ||
| java.math.BigDecimal b2 = new java.math.BigDecimal(v2); | ||
| return String.valueOf(b1.multiply(b2)); | ||
| } | ||
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| /** | ||
| * division. e = 10^-10 | ||
| * | ||
| * @param v1 | ||
| * p1 | ||
| * @param v2 | ||
| * p2 | ||
| * @return div | ||
| */ | ||
| public static String div(String v1, String v2) { | ||
| java.math.BigDecimal b1 = new java.math.BigDecimal(v1); | ||
| java.math.BigDecimal b2 = new java.math.BigDecimal(v2); | ||
| return String.valueOf(b1.divide(b2, DEF_DIV_SCALE, java.math.BigDecimal.ROUND_HALF_UP)); | ||
| } | ||
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| /** | ||
| * rounding | ||
| * | ||
| * @param v p | ||
| * @param scale scale | ||
| * @return result | ||
| */ | ||
| public static double round(double v, int scale) { | ||
| if (scale < 0) { | ||
| throw new IllegalArgumentException("The scale must be a positive integer or zero"); | ||
| } | ||
| java.math.BigDecimal b = new java.math.BigDecimal(Double.toString(v)); | ||
| java.math.BigDecimal one = new java.math.BigDecimal("1"); | ||
| return b.divide(one, scale, java.math.BigDecimal.ROUND_HALF_UP).doubleValue(); | ||
| } | ||
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| public static String round(String v, int scale) { | ||
| if (scale < 0) { | ||
| throw new IllegalArgumentException("The scale must be a positive integer or zero"); | ||
| } | ||
| java.math.BigDecimal b = new java.math.BigDecimal(v); | ||
| java.math.BigDecimal one = new java.math.BigDecimal("1"); | ||
| return String.valueOf(b.divide(one, scale, java.math.BigDecimal.ROUND_HALF_UP)); | ||
| } | ||
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| } |
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