X-Git-Url: http://jsfdemo.indexdata.com/?a=blobdiff_plain;ds=sidebyside;f=README;h=1cd2bd98b3cbb4c55cfc89636f16ea196ba053ea;hb=f93b59f21f11404a6bdbb1f8d4796ca6f0281dba;hp=7bb99037e512b1297fe1c493d7c2da75cad23d99;hpb=0bb492706af9cb665b02be8e544c9ff10152efed;p=cql-java-moved-to-github.git diff --git a/README b/README index 7bb9903..1cd2bd9 100644 --- a/README +++ b/README @@ -1,13 +1,15 @@ -$Header: /home/cvsroot/cql-java/README,v 1.1 2002-10-24 15:57:56 mike Exp $ +$Id: README,v 1.8 2002-11-01 23:45:28 mike Exp $ cql-java -- a free CQL compiler for Java This project provides a set of classes for representing a CQL parse -tree (CQLBooleanNode, CQLTermNode, etc.) and a Compiler class which +tree (CQLBooleanNode, CQLTermNode, etc.) and a CQLCompiler class which builds a parse tree given a CQL query as input. It also provides -compiler back-ends to render out the parse tree either as XCQL or -Yaz-style Prefix Query Format (PQF). +compiler back-ends to render out the parse tree as XCQL (the XML +representation), as PQF (Yaz-style Prefix Query Format) and as CQL +(i.e. decompiling the parse-tree). Oh, and there's a random query +generator, too. CQL is "Common Query Language", a new query language designed under the umbrella of the ZING initiative (Z39.59-International Next @@ -33,18 +35,26 @@ Library: import org.z3950.zing.cql.* + // Building a parse-tree by hand + CQLNode n1 = new CQLTermNode("dc.author", "=", "kernighan"); + CQLNode n2 = new CQLTermNode("dc.title", "all", "elements style"); + CQLNode root = new CQLAndNode(n1, n2); + System.out.println(root.toXCQL(3)); + + // Parsing a CQL query CQLParser parser = new CQLParser(); CQLNode root = parser.parse("title=dinosaur"); - print root.toXCQL(); - print root.toPQF(qualSet); + System.out.println(root.toXCQL(0)); + System.out.println(root.toCQL()); + System.out.println(root.toPQF(qualSet)); // ... where `qualSet' specifies CQL-qualfier => Z-attr mapping DESCRIPTION ----------- -Se the automatically generated class documentation in the "doc" -subdirectory. (### It's not there yet, of course) +See the automatically generated class documentation in the "doc" +subdirectory. (It's not all there yet, but it's coming.) AUTHOR @@ -62,9 +72,58 @@ licence to use. Be good. Assume I'm going with the GPL (most restrictive) until I say otherwise. +TESTING +------- + +Ways of testing the parser and other components include: + +* Generate a random tree with CQLGenerate, take a copy, and + canonicalise it with CQLparser -c. Since the CQLGenerate output is + in canonical form anyway, the before-and-after versions should be + identical. + +* ... others :-) + + SEE ALSO -------- Adam Dickmeiss's CQL compiler, written in C. Rob Sanderson's CQL compiler, written in Python. -All the other free CQL compilers everyone's going to write. +All the other free CQL compilers everyone's going to write :-) + + +TO DO +----- + +* Allow CQLGenerate test-harness to take some of its configuration + parameters on the command-line as well as or instead of a file. + +* Some niceties for the cql-decompiling back-end: + * don't emit redundant parentheses. + * don't put spaces around relations that don't need them. + +* Write pqn-generating back-end (will need to be driven from a + configuation file specifying how to represent the qualifiers, + relations, relation modifiers and wildcard characters as z39.50 + attributes.) + +* Consider the utility of yet another back-end that translates a + CQLNode tree into a Type-1 query tree using the JZKit data + structures. That would be nice so that CQL could become a JZKit + query-type; but you could achieve the same effect by generating PQN, + and running that through JZKit's existing PQN-to-Type-1 compiler. + +* Refinements to random query generator: + * Generate relation modifiers + * Proximity support + * Don't always generate qualifier/relation for terms + * Better selection of qualifier (configurable?) + * Better selection of terms (from a dictionary file?) + * Introduce wildcard characters into generated terms + * Generate multi-word terms + +* Write fuller "javadoc" comments. + +* Write generic test suite. +