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java.lang.Object org.apache.lucene.expressions.Bindings org.apache.lucene.expressions.SimpleBindings
public final class SimpleBindings
Simple class that binds expression variable names to SortField
s
or other Expression
s.
Example usage:
SimpleBindings bindings = new SimpleBindings(); // document's text relevance score bindings.add(new SortField("_score", SortField.Type.SCORE)); // integer NumericDocValues field (or from FieldCache) bindings.add(new SortField("popularity", SortField.Type.INT)); // another expression bindings.add("recency", myRecencyExpression); // create a sort field in reverse order Sort sort = new Sort(expr.getSortField(bindings, true));
Constructor Summary | |
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SimpleBindings()
Creates a new empty Bindings |
Method Summary | |
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void |
add(SortField sortField)
Adds a SortField to the bindings. |
void |
add(String name,
Expression expression)
Adds an Expression to the bindings. |
ValueSource |
getValueSource(String name)
Returns a ValueSource bound to the variable name. |
void |
validate()
Traverses the graph of bindings, checking there are no cycles or missing references |
Methods inherited from class org.apache.lucene.expressions.Bindings |
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getScoreValueSource |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SimpleBindings()
Method Detail |
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public void add(SortField sortField)
This can be used to reference a DocValuesField, a field from FieldCache, the document's score, etc.
public void add(String name, Expression expression)
This can be used to reference expressions from other expressions.
public ValueSource getValueSource(String name)
Bindings
getValueSource
in class Bindings
public void validate()
IllegalArgumentException
- if the bindings is inconsistent
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