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Change lit to extend AstEnum; rename factory methods
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,242 @@ | ||
| package org.partiql.ast; | ||
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| import lombok.EqualsAndHashCode; | ||
| import org.jetbrains.annotations.NotNull; | ||
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| import java.math.BigDecimal; | ||
| import java.math.BigInteger; | ||
| import java.util.Collection; | ||
| import java.util.Collections; | ||
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| import static java.util.Objects.requireNonNull; | ||
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| /** | ||
| * TODO docs | ||
| */ | ||
| @EqualsAndHashCode(callSuper = false) | ||
| public class Literal extends AstEnum { | ||
| public static final int UNKNOWN = 0; | ||
| // absent literals | ||
| public static final int NULL = 1; | ||
| public static final int MISSING = 2; | ||
| // boolean literal | ||
| public static final int BOOL = 3; | ||
| // numeric literals | ||
| public static final int APPROX_NUM = 4; | ||
| public static final int EXACT_NUM = 5; | ||
| public static final int INT_NUM = 6; | ||
| // string literal | ||
| public static final int STRING = 7; | ||
| // typed string literal | ||
| public static final int TYPED_STRING = 8; | ||
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| // Literal fields | ||
| private final int code; | ||
| private final Boolean boolValue; | ||
| private final String stringValue; | ||
| private final DataType dataType; | ||
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| /////// Constructors | ||
| private Literal(int code, Boolean value, String stringValue, DataType dataType) { | ||
| this.code = code; | ||
| this.boolValue = value; | ||
| this.stringValue = stringValue; | ||
| this.dataType = dataType; | ||
| } | ||
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| // Private constructor for absent literals | ||
| private Literal(int code) { | ||
| this.code = code; | ||
| // Rest set to null | ||
| this.boolValue = null; | ||
| this.stringValue = null; | ||
| this.dataType = null; | ||
| } | ||
|
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| // Private constructor for boolean literal | ||
| private Literal(boolean value) { | ||
| this.code = BOOL; | ||
| this.boolValue = value; | ||
| // Rest set to null | ||
| this.stringValue = null; | ||
| this.dataType = null; | ||
| } | ||
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| // Private constructor for literals stored w/ just a string (e.g. numerics, single-quoted strings) | ||
| private Literal(int code, String value) { | ||
| this.code = code; | ||
| this.stringValue = value; | ||
| // Rest set to null | ||
| this.boolValue = null; | ||
| this.dataType = null; | ||
| } | ||
|
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| // Private constructor for typed string literal | ||
| private Literal(DataType dataType, String value) { | ||
| this.code = TYPED_STRING; | ||
| this.stringValue = value; | ||
| this.dataType = dataType; | ||
| // Rest set to null | ||
| this.boolValue = null; | ||
| } | ||
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| @Override | ||
| public int code() { | ||
| return code; | ||
| } | ||
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| @NotNull | ||
| @Override | ||
| public String name() { | ||
| switch (code) { | ||
| case NULL: return "NULL"; | ||
| case MISSING: return "MISSING"; | ||
| case BOOL: return "BOOL"; | ||
| case APPROX_NUM: return "APPROX_NUM"; | ||
| case EXACT_NUM: return "EXACT_NUM"; | ||
| case INT_NUM: return "INT_NUM"; | ||
| case STRING: return "STRING"; | ||
| case TYPED_STRING: return "TYPED_STRING"; | ||
| default: return "UNKNOWN"; | ||
| } | ||
| } | ||
|
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| @Override | ||
| @NotNull | ||
| public Collection<AstNode> children() { | ||
| return Collections.emptyList(); | ||
| } | ||
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| @Override | ||
| public <R, C> R accept(@NotNull AstVisitor<R, C> visitor, C ctx) { | ||
| return visitor.visitLiteral(this, ctx); | ||
| } | ||
|
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| // Factory methods | ||
| public static Literal approxNum(@NotNull String value) { | ||
| return new Literal(APPROX_NUM, value); | ||
| } | ||
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| public static Literal bool(boolean value) { | ||
| return new Literal(value); | ||
| } | ||
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| public static Literal exactNum(@NotNull BigDecimal value) { | ||
| if (value.scale() == 0) { | ||
| return new Literal(EXACT_NUM, value + "."); | ||
| } else { | ||
| return new Literal(EXACT_NUM, value.toString()); | ||
| } | ||
| } | ||
|
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| public static Literal exactNum(@NotNull String value) { | ||
| return new Literal(EXACT_NUM, value); | ||
| } | ||
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| public static Literal intNum(int value) { | ||
| return new Literal(INT_NUM, Integer.toString(value)); | ||
| } | ||
|
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| public static Literal intNum(long value) { | ||
| return new Literal(INT_NUM, Long.toString(value)); | ||
| } | ||
|
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| public static Literal intNum(@NotNull BigInteger value) { | ||
| return new Literal(INT_NUM, value.toString()); | ||
| } | ||
|
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| public static Literal intNum(@NotNull String value) { | ||
| return new Literal(INT_NUM, value); | ||
| } | ||
|
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| public static Literal nul() { | ||
| return new Literal(NULL); | ||
| } | ||
|
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| public static Literal missing() { | ||
| return new Literal(MISSING); | ||
| } | ||
|
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| public static Literal string(@NotNull String value) { | ||
| return new Literal(STRING, value); | ||
| } | ||
|
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| public static Literal typedString(@NotNull DataType type, @NotNull String value) { | ||
| return new Literal(type, value); | ||
| } | ||
|
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| // Value extraction | ||
| /** | ||
| * TODO docs | ||
| * Valid for just BOOL | ||
| */ | ||
| public boolean booleanValue() { | ||
| if (code == BOOL) { | ||
| requireNonNull(boolValue, "bool value"); | ||
| return boolValue; | ||
| } | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| /** | ||
| * TODO docs | ||
| * Valid for just APPROX_NUM, EXACT_NUM, and INT_NUM. | ||
| */ | ||
| @NotNull | ||
| public String numberValue() { | ||
| switch (code) { | ||
| case APPROX_NUM: | ||
| case EXACT_NUM: | ||
| case INT_NUM: | ||
| requireNonNull(stringValue, "string value for numerics"); | ||
| return stringValue; | ||
| default: | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } | ||
|
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| /** | ||
| * TODO docs | ||
| * Valid for just EXACT_NUM and INT_NUM | ||
| */ | ||
| @NotNull | ||
| public BigDecimal bigDecimalValue() { | ||
| switch (code) { | ||
| case EXACT_NUM: | ||
| case INT_NUM: | ||
| requireNonNull(stringValue, "string value for exact and int numerics"); | ||
| return new BigDecimal(stringValue); | ||
| default: | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } | ||
|
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| /** | ||
| * TODO docs | ||
| * Valid for just STRING and TYPED_STRING | ||
| */ | ||
| @NotNull | ||
| public String stringValue() { | ||
| switch (code) { | ||
| case STRING: | ||
| case TYPED_STRING: | ||
| requireNonNull(stringValue, "string value"); | ||
| return stringValue; | ||
| default: | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } | ||
|
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| /** | ||
| * TODO docs | ||
| * Valid for just TYPED_STRING | ||
| */ | ||
| @NotNull | ||
| public DataType dataType() { | ||
| if (code == TYPED_STRING) { | ||
| requireNonNull(dataType, "data type"); | ||
| return dataType; | ||
| } | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } |
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