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java.lang.Objectorg.d2rq.values.ColumnValueMaker
public class ColumnValueMaker
A ValueMaker
that takes its values from a single
column.
Field Summary |
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Fields inherited from interface org.d2rq.values.ValueMaker |
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NULL |
Constructor Summary | |
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ColumnValueMaker(ColumnName column)
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Method Summary | |
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void |
describeSelf(NodeSetFilter c)
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String |
makeValue(ResultRow row)
Retrieves a value from a database row according to some rule or pattern. |
boolean |
matches(String value)
Indicates whether the node maker is capable of producing a given value, as far as can be told without having access to the actual database. |
List<OrderOp.OrderSpec> |
orderSpecs(boolean ascending)
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Set<ProjectionSpec> |
projectionSpecs()
Returns a set of all ProjectionSpec s containing data necessary
for this ValueSource. |
ValueMaker |
rename(Renamer renamer)
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String |
toString()
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Expression |
valueExpression(String value,
DatabaseOp tabular,
Vendor vendor)
A SQL expression that selects only rows where this value maker produces the specified value. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ColumnValueMaker(ColumnName column)
Method Detail |
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public String makeValue(ResultRow row)
ValueMaker
makeValue
in interface ValueMaker
row
- the database row
public void describeSelf(NodeSetFilter c)
describeSelf
in interface ValueMaker
public boolean matches(String value)
ValueMaker
matches
in interface ValueMaker
true
iff this node maker is capable of producing the valuepublic Expression valueExpression(String value, DatabaseOp tabular, Vendor vendor)
ValueMaker
Expression.FALSE
if this
value maker is incapable of producing the value.
valueExpression
in interface ValueMaker
value
- A valuetabular
- The table to which the expression will be applicablevendor
- A vendor instance for datatyping etc.
public Set<ProjectionSpec> projectionSpecs()
ValueMaker
ProjectionSpec
s containing data necessary
for this ValueSource.
projectionSpecs
in interface ValueMaker
ProjectionSpec
spublic ValueMaker rename(Renamer renamer)
rename
in interface ValueMaker
public List<OrderOp.OrderSpec> orderSpecs(boolean ascending)
orderSpecs
in interface ValueMaker
public String toString()
toString
in class Object
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