org.z3950.zing.cql
Class CQLTermNode

java.lang.Object
  extended by org.z3950.zing.cql.CQLNode
      extended by org.z3950.zing.cql.CQLTermNode

public class CQLTermNode
extends CQLNode

Represents a terminal node in a CQL parse-tree. A term node consists of the term String itself, together with, optionally, an index string and a relation. Neither or both of these must be provided - you can't have an index without a relation or vice versa.


Field Summary
 
Fields inherited from class org.z3950.zing.cql.CQLNode
APPLICATION, BITSTRING, BOOLEAN, CONSTRUCTED, CONTEXT, ENUMERATED, EXTERNAL, GENERALSTRING, INTEGER, NULL, OBJECTDESCRIPTOR, OBJECTIDENTIFIER, OCTETSTRING, PRIMITIVE, PRIVATE, SEQUENCE, SET, UNIVERSAL, VISIBLESTRING
 
Constructor Summary
CQLTermNode(String index, CQLRelation relation, String term)
          Creates a new term node with the specified index, relation and term.
 
Method Summary
 String getIndex()
           
 CQLRelation getRelation()
           
 String getResultSetName()
          Returns the name of the result-set to which this query is a reference, if and only if the entire query consists only of a result-set reference.
 String getTerm()
           
 String toCQL()
          Decompiles a parse-tree into a CQL query.
 String toPQF(Properties config)
          Renders a parse-tree into a Yaz-style PQF string.
 byte[] toType1BER(Properties config)
          Renders a parser-tree into a BER-endoded packet representing an equivalent Z39.50 Type-1 query.
 
Methods inherited from class org.z3950.zing.cql.CQLNode
lenLen, makeOID, makeQuery, numLen, putNum, putTag, toString, toXCQL
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

CQLTermNode

public CQLTermNode(String index,
                   CQLRelation relation,
                   String term)
Creates a new term node with the specified index, relation and term. The first two may be null, but the term may not.

Method Detail

getIndex

public String getIndex()

getRelation

public CQLRelation getRelation()

getTerm

public String getTerm()

getResultSetName

public String getResultSetName()
Description copied from class: CQLNode
Returns the name of the result-set to which this query is a reference, if and only if the entire query consists only of a result-set reference. If it's anything else, including a boolean combination of a result-set reference with something else, then null is returned instead.

Overrides:
getResultSetName in class CQLNode
Returns:
the name of the referenced result-set

toCQL

public String toCQL()
Description copied from class: CQLNode
Decompiles a parse-tree into a CQL query.

Specified by:
toCQL in class CQLNode
Returns:
A String containing a CQL query equivalent to the parse-tree whose root is this node, so that compiling that query will yield an identical tree.

toPQF

public String toPQF(Properties config)
             throws PQFTranslationException
Description copied from class: CQLNode
Renders a parse-tree into a Yaz-style PQF string. PQF, or Prefix Query Format, is a cryptic but powerful notation that can be trivially mapped, one-to-one, int Z39.50 Type-1 and Type-101 queries. A specification for the format can be found in Chapter 7 (Supporting Tools) of the YAZ manual.

Specified by:
toPQF in class CQLNode
Parameters:
config - A Properties object containing configuration information that specifies the mapping from CQL indexes, relations, etc. to Type-1 attributes. The mapping specification is described in the CQL-Java distribution's sample PQF-mapping configuration file, etc/pqf.properties, which see.
Returns:
A String containing a PQF query equivalent to the parse-tree whose root is this node.
Throws:
PQFTranslationException

toType1BER

public byte[] toType1BER(Properties config)
                  throws PQFTranslationException
Description copied from class: CQLNode
Renders a parser-tree into a BER-endoded packet representing an equivalent Z39.50 Type-1 query. If you don't know what that means, then you don't need this method :-) This is useful primarily for SRW-to-Z39.50 gateways.

Specified by:
toType1BER in class CQLNode
Parameters:
config - A Properties object containing configuration information that specifies the mapping from CQL indexes, relations, etc. to Type-1 attributes. The mapping specification is described in the CQL-Java distribution's sample PQF-mapping configuration file, etc/pqf.properties, which see.
Returns:
A byte array containing the BER packet.
Throws:
PQFTranslationException
See Also:
ftp://ftp.rsasecurity.com/pub/pkcs/ascii/layman.asc


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