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< > BotCompany Repo | #1035459 // typeConversionScore - backup before precise subtype dispatch

JavaX fragment (include)

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// Can a be converted to b?
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// score 0 = exact match
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// score Int.MAX_VALUE = no match
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// score 1 = conversion needed (boxing/unboxing or non-primitve widening)
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// score -2 = primitive widening needed
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static int typeConversionScore(Class a, Class b) {
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  if (a == b) ret 0;
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  if (b.isPrimitive()) {
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    // target type is primitive
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    if (a.isPrimitive()) {
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      // both types are primitive
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      // No widenings to bool
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      if (b == bool.class) ret Int.MAX_VALUE;
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      // No widenings to byte
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      if (b == byte.class) ret Int.MAX_VALUE;
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      // byte can be converted to char
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      if (b == char.class) ret a == byte.class ? -2 : Int.MAX_VALUE;
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      // byte can be converted to short
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      if (b == short.class) ret a == byte.class ? -2 : Int.MAX_VALUE;
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      // byte, char and short can be converted to int
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      if (b == int.class) ret a == byte.class || a == char.class || a == short.class ? -2 : Int.MAX_VALUE;
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      // byte, char, short and int can be converted to long
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      if (b == long.class) ret a == byte.class || a == char.class || a == short.class || a == int.class ? -2 : Int.MAX_VALUE;
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      // byte, char, short and int can be converted to float
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      if (b == float.class) ret a == byte.class || a == char.class || a == short.class || a == int.class ? -2 : Int.MAX_VALUE;
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      // all primitive types except bool can be converted to double
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      ret a != bool.class ? -2 : Int.MAX_VALUE;
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    } else {
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      // source type is boxed - check if they're a match 
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      ret primitiveToBoxedType(b) == a ?  1 : Int.MAX_VALUE;
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    }
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  } else {
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    // target type is not primitive
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    // object type is primitive - check for exact match
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    if (a.isPrimitive()) ret primitiveToBoxedType(a) == b ? 1 : Int.MAX_VALUE;
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    // both types are not primitive
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    ret b.isAssignableFrom(a) ? 1 : Int.MAX_VALUE;
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  }
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}

Author comment

Began life as a copy of #1034747

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Travelled to 2 computer(s): mowyntqkapby, mqqgnosmbjvj

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Snippet ID: #1035459
Snippet name: typeConversionScore - backup before precise subtype dispatch
Eternal ID of this version: #1035459/2
Text MD5: 62c12248b21ab04e6f76cb9f16b1a8b4
Author: stefan
Category: javax
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2022-05-19 20:28:32
Source code size: 1948 bytes / 53 lines
Pitched / IR pitched: No / No
Views / Downloads: 111 / 121
Version history: 1 change(s)
Referenced in: [show references]