org.z3950.zing.cql
Class CQLBooleanNode

java.lang.Object
  org.z3950.zing.cql.CQLNode
      org.z3950.zing.cql.CQLBooleanNode

Direct Known Subclasses:

CQLAndNode, CQLNotNode, CQLOrNode, CQLProxNode

public abstract class CQLBooleanNode
extends CQLNode

Represents a boolean node in a CQL parse-tree.

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

protected

CQLBooleanNode(CQLNode left, CQLNode right, ModifierSet ms)

Method Summary

CQLNode	getLeftOperand() The root of a parse-tree representing the left-hand side.
List<Modifier>	getModifiers() The set of modifiers that are applied to this boolean.
CQLNode	getRightOperand() The root of a parse-tree representing the right-hand side.
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

getResultSetName, 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

CQLBooleanNode

protected CQLBooleanNode(CQLNode left,
                         CQLNode right,
                         ModifierSet ms)

Method Detail

getLeftOperand

public CQLNode getLeftOperand()

The root of a parse-tree representing the left-hand side.

getRightOperand

public CQLNode getRightOperand()

The root of a parse-tree representing the right-hand side.

getModifiers

public List<Modifier> getModifiers()

The set of modifiers that are applied to this boolean.

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