Enum NullPolicy
- java.lang.Object
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- java.lang.Enum<NullPolicy>
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- org.apache.calcite.adapter.enumerable.NullPolicy
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Comparable<NullPolicy>
public enum NullPolicy extends java.lang.Enum<NullPolicy>
Describes when a function/operator will return null.STRICT and ANY are similar. STRICT says f(a0, a1) will NEVER return null if a0 and a1 are not null. This means that we can check whether f returns null just by checking its arguments. Use STRICT in preference to ANY whenever possible.
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Enum Constant Summary
Enum Constants Enum Constant Description AND
If any of the arguments are false, result is false; else if any arguments are null, result is null; else true.ANY
If any of the arguments are null, return null.NONE
NOT
If any argument is true, result is false; else if any argument is null, result is null; else true.OR
If any of the arguments are true, result is true; else if any arguments are null, result is null; else false.SEMI_STRICT
Returns null if one of the arguments is null, and possibly other times.STRICT
Returns null if and only if one of the arguments are null.
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Constructor Summary
Constructors Modifier Constructor Description private
NullPolicy()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static NullPolicy
valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name.static NullPolicy[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Detail
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STRICT
public static final NullPolicy STRICT
Returns null if and only if one of the arguments are null.
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SEMI_STRICT
public static final NullPolicy SEMI_STRICT
Returns null if one of the arguments is null, and possibly other times.
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ANY
public static final NullPolicy ANY
If any of the arguments are null, return null.
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AND
public static final NullPolicy AND
If any of the arguments are false, result is false; else if any arguments are null, result is null; else true.
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OR
public static final NullPolicy OR
If any of the arguments are true, result is true; else if any arguments are null, result is null; else false.
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NOT
public static final NullPolicy NOT
If any argument is true, result is false; else if any argument is null, result is null; else true.
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NONE
public static final NullPolicy NONE
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Method Detail
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values
public static NullPolicy[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:for (NullPolicy c : NullPolicy.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
public static NullPolicy valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
java.lang.IllegalArgumentException
- if this enum type has no constant with the specified namejava.lang.NullPointerException
- if the argument is null
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