org.apache.lucene.search
Enum BooleanClause.Occur

java.lang.Object
  extended by java.lang.Enum<BooleanClause.Occur>
      extended by org.apache.lucene.search.BooleanClause.Occur
All Implemented Interfaces:
Serializable, Comparable<BooleanClause.Occur>
Enclosing class:
BooleanClause

public static enum BooleanClause.Occur
extends Enum<BooleanClause.Occur>

Specifies how clauses are to occur in matching documents.


Enum Constant Summary
MUST
          Use this operator for clauses that must appear in the matching documents.
MUST_NOT
          Use this operator for clauses that must not appear in the matching documents.
SHOULD
          Use this operator for clauses that should appear in the matching documents.
 
Method Summary
static BooleanClause.Occur valueOf(String name)
          Returns the enum constant of this type with the specified name.
static BooleanClause.Occur[] values()
          Returns an array containing the constants of this enum type, in the order they are declared.
 
Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Enum Constant Detail

MUST

public static final BooleanClause.Occur MUST
Use this operator for clauses that must appear in the matching documents.


SHOULD

public static final BooleanClause.Occur SHOULD
Use this operator for clauses that should appear in the matching documents. For a BooleanQuery with no MUST clauses one or more SHOULD clauses must match a document for the BooleanQuery to match.

See Also:
BooleanQuery.setMinimumNumberShouldMatch(int)

MUST_NOT

public static final BooleanClause.Occur MUST_NOT
Use this operator for clauses that must not appear in the matching documents. Note that it is not possible to search for queries that only consist of a MUST_NOT clause.

Method Detail

values

public static BooleanClause.Occur[] 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 (BooleanClause.Occur c : BooleanClause.Occur.values())
    System.out.println(c);

Returns:
an array containing the constants of this enum type, in the order they are declared

valueOf

public static BooleanClause.Occur valueOf(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:
IllegalArgumentException - if this enum type has no constant with the specified name
NullPointerException - if the argument is null


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