org.z3950.zing.cql
Class CQLRelation
java.lang.Object
|
+--org.z3950.zing.cql.CQLNode
|
+--org.z3950.zing.cql.CQLRelation
- public class CQLRelation
- extends CQLNode
Represents a relation between a CQL qualifier and term.
- Version:
- $Id: CQLRelation.java,v 1.5 2002/11/06 20:13:45 mike Exp $
Method Summary |
void |
addModifier(java.lang.String modifier)
|
java.lang.String |
getBase()
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java.lang.String[] |
getModifiers()
|
java.lang.String |
toCQL()
Decompiles a parse-tree into a CQL query. |
java.lang.String |
toPQF(java.util.Properties config)
Renders a parse-tree into a Yaz-style PQF string. |
java.lang.String |
toXCQL(int level)
Translates a parse-tree into an XCQL document. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
CQLRelation
public CQLRelation(java.lang.String base)
getBase
public java.lang.String getBase()
addModifier
public void addModifier(java.lang.String modifier)
getModifiers
public java.lang.String[] getModifiers()
toXCQL
public java.lang.String toXCQL(int level)
- Description copied from class:
CQLNode
- Translates a parse-tree into an XCQL document.
- Overrides:
toXCQL
in class CQLNode
- Following copied from class:
org.z3950.zing.cql.CQLNode
- Parameters:
level
- The number of levels to indent the top element of the XCQL
document. This will typically be 0 when invoked by an
application; it takes higher values when this method is
invoked recursively for nodes further down the tree.- Returns:
- A String containing an XCQL document equivalent to the
parse-tree whose root is this node.
toCQL
public java.lang.String toCQL()
- Description copied from class:
CQLNode
- Decompiles a parse-tree into a CQL query.
- Overrides:
toCQL
in class CQLNode
- Following copied from class:
org.z3950.zing.cql.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 java.lang.String toPQF(java.util.Properties config)
throws PQFTranslationException
- Description copied from class:
CQLNode
- Renders a parse-tree into a Yaz-style PQF string.
query ::= top-set query-struct.
top-set ::= [ '@attrset' string ]
query-struct ::= attr-spec | simple | complex | '@term' term-type
attr-spec ::= '@attr' [ string ] string query-struct
complex ::= operator query-struct query-struct.
operator ::= '@and' | '@or' | '@not' | '@prox' proximity.
simple ::= result-set | term.
result-set ::= '@set' string.
term ::= string.
proximity ::= exclusion distance ordered relation which-code unit-code.
exclusion ::= '1' | '0' | 'void'.
distance ::= integer.
ordered ::= '1' | '0'.
relation ::= integer.
which-code ::= 'known' | 'private' | integer.
unit-code ::= integer.
term-type ::= 'general' | 'numeric' | 'string' | 'oid' | 'datetime' | 'null'.
- Overrides:
toPQF
in class CQLNode
- Following copied from class:
org.z3950.zing.cql.CQLNode
- Returns:
- A String containing a PQF query equivalent to the parse-tree
whose root is this node. This may be fed into the tool of
your choice to obtain a BER-encoded packet.