Class AbstractComparativeField
- java.lang.Object
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- com.singularsys.extensions.field.implementations.AbstractComparativeField
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- All Implemented Interfaces:
FieldI
,java.io.Serializable
- Direct Known Subclasses:
ExtDocsTest.StringField2
,GenericField
,StringField
public abstract class AbstractComparativeField extends java.lang.Object implements FieldI
An abstract base class for fields where comparison methods are implemented using a singlecmp(a,b)
method. Subclasses just need to implement a single method and not the full set of comparison methods. Not all types what to extend this class, for instance with doubles it fails to work with NaN values.- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description AbstractComparativeField()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description abstract java.lang.Integer
cmp(java.lang.Object l, java.lang.Object r)
Compare two elements, return -1,0,1 if the comparison can be carried out, null otherwise.java.lang.Boolean
eq(java.lang.Object l, java.lang.Object r)
Equalsjava.lang.Boolean
ge(java.lang.Object l, java.lang.Object r)
Greater or equal tojava.lang.Boolean
gt(java.lang.Object l, java.lang.Object r)
Greater thanjava.lang.Boolean
le(java.lang.Object l, java.lang.Object r)
Less than or equals tojava.lang.Boolean
lt(java.lang.Object l, java.lang.Object r)
Less thanjava.lang.Boolean
ne(java.lang.Object l, java.lang.Object r)
Not Equals
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Method Detail
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cmp
public abstract java.lang.Integer cmp(java.lang.Object l, java.lang.Object r) throws EvaluationException
Compare two elements, return -1,0,1 if the comparison can be carried out, null otherwise.- Parameters:
l
-r
-- Returns:
- -1, 0, 1 if l < r, l==r or l > r respectively, or null if comparison cannot be carried out or
- Throws:
EvaluationException
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eq
public java.lang.Boolean eq(java.lang.Object l, java.lang.Object r) throws EvaluationException
Description copied from interface:FieldI
Equals- Specified by:
eq
in interfaceFieldI
- Parameters:
l
- left hand argumentr
- right hand argument- Returns:
- an object representing the result or null if it can not be evaluated.
- Throws:
EvaluationException
- on error
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ne
public java.lang.Boolean ne(java.lang.Object l, java.lang.Object r) throws EvaluationException
Description copied from interface:FieldI
Not Equals- Specified by:
ne
in interfaceFieldI
- Parameters:
l
- left hand argumentr
- right hand argument- Returns:
- an object representing the result or null if it can not be evaluated.
- Throws:
EvaluationException
- on error
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gt
public java.lang.Boolean gt(java.lang.Object l, java.lang.Object r) throws EvaluationException
Description copied from interface:FieldI
Greater than- Specified by:
gt
in interfaceFieldI
- Parameters:
l
- left hand argumentr
- right hand argument- Returns:
- an object representing the result or null if it can not be evaluated.
- Throws:
EvaluationException
- on error
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ge
public java.lang.Boolean ge(java.lang.Object l, java.lang.Object r) throws EvaluationException
Description copied from interface:FieldI
Greater or equal to- Specified by:
ge
in interfaceFieldI
- Parameters:
l
- left hand argumentr
- right hand argument- Returns:
- an object representing the result or null if it can not be evaluated.
- Throws:
EvaluationException
- on error
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lt
public java.lang.Boolean lt(java.lang.Object l, java.lang.Object r) throws EvaluationException
Description copied from interface:FieldI
Less than- Specified by:
lt
in interfaceFieldI
- Parameters:
l
- left hand argumentr
- right hand argument- Returns:
- an object representing the result or null if it can not be evaluated.
- Throws:
EvaluationException
- on error
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le
public java.lang.Boolean le(java.lang.Object l, java.lang.Object r) throws EvaluationException
Description copied from interface:FieldI
Less than or equals to- Specified by:
le
in interfaceFieldI
- Parameters:
l
- left hand argumentr
- right hand argument- Returns:
- an object representing the result or null if it can not be evaluated.
- Throws:
EvaluationException
- on error
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