com.hp.hpl.jena.sdb.layout2.expr.StringExprCompiler Maven / Gradle / Ivy
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/*
* (c) Copyright 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
* All rights reserved.
* [See end of file]
*/
package com.hp.hpl.jena.sdb.layout2.expr;
import org.slf4j.LoggerFactory;
import com.hp.hpl.jena.sparql.core.Var;
import com.hp.hpl.jena.sparql.engine.binding.Binding;
import com.hp.hpl.jena.sparql.expr.Expr;
import com.hp.hpl.jena.sdb.SDBException;
import com.hp.hpl.jena.sdb.compiler.ConditionCompiler;
import com.hp.hpl.jena.sdb.compiler.SDBConstraint;
import com.hp.hpl.jena.sdb.core.ExprPattern;
import com.hp.hpl.jena.sdb.core.Scope;
import com.hp.hpl.jena.sdb.core.sqlexpr.*;
import com.hp.hpl.jena.sdb.exprmatch.ActionMatch;
import com.hp.hpl.jena.sdb.exprmatch.ActionMatchString;
import com.hp.hpl.jena.sdb.exprmatch.ActionMatchVar;
import com.hp.hpl.jena.sdb.exprmatch.MapResult;
import com.hp.hpl.jena.sdb.layout2.ValueType;
public class StringExprCompiler implements ConditionCompiler
{
private static ExprPattern equalsString1 = new ExprPattern("?a1 = ?a2",
new Var[]{ Var.alloc("a1") , Var.alloc("a2") },
new ActionMatch[]{ new ActionMatchVar() ,
new ActionMatchString()}) ;
// As equalsString1 but reverse the arguments.
private static ExprPattern equalsString2 = new ExprPattern("?a2 = ?a1",
new Var[]{ Var.alloc("a1") , Var.alloc("a2") },
new ActionMatch[]{ new ActionMatchVar() ,
new ActionMatchString()}) ;
// private static ExprPattern equalsString3 = new ExprPattern("str(?a1) = ?a2",
// new Var[]{ Var.alloc("a1") , Var.alloc("a2") },
// new Action[]{ new ActionMatchVar() ,
// new ActionMatchString()}) ;
//// As equalsString3 but reverse the arguments.
// private static ExprPattern equalsString4 = new ExprPattern("?a1 = str(?a2)",
// new Var[]{ Var.alloc("a1") , Var.alloc("a2") },
// new Action[]{ new ActionMatchString() ,
// new ActionMatchVar() }) ;
public SDBConstraint recognize(Expr expr)
{
MapResult rMap = null ;
if ( ( rMap = equalsString1.match(expr) ) != null )
{
Var var = rMap.get("a1").getExprVar().asVar() ;
String str = rMap.get("a2").getConstant().getString() ;
return new StringEqualsSqlGen(expr, equalsString1, true) ;
}
return null ;
}
}
class StringEqualsSqlGen extends SDBConstraint
{
ExprPattern exprPattern ;
boolean completeConstraint ;
public StringEqualsSqlGen(Expr expr, ExprPattern exprPattern, boolean completeConstraint)
{
super(expr, completeConstraint) ;
this.exprPattern = exprPattern ;
}
@Override
public SDBConstraint substitute(Binding binding)
{
return new StringEqualsSqlGen(getExpr().copySubstitute(binding),
exprPattern,
super.isComplete()) ;
}
@Override
public SqlExpr compile(Scope scope)
{
MapResult rMap = exprPattern.match(getExpr()) ;
if ( rMap == null )
throw new SDBException("Couldn't compile after all: "+getExpr()) ;
//log.info("equalsString - Matched: ?a1 = "+rMap.get("a1")+" : ?a2 = "+rMap.get("a2")) ;
Var var = rMap.get("a1").getExprVar().asVar() ;
String str = rMap.get("a2").getConstant().getString() ;
if ( ! scope.hasColumnForVar(var) )
{
LoggerFactory.getLogger(this.getClass()).error("Variable '"+var+"' not in scope") ;
return null ;
}
SqlColumn vCol = scope.findScopeForVar(var).getColumn() ;
SqlColumn lexCol = new SqlColumn(vCol.getTable(), "lex") ;
SqlColumn vTypeCol = new SqlColumn(vCol.getTable(), "type") ;
// "is a string"
SqlExpr isStr = new S_Equal(vTypeCol, new SqlConstant(ValueType.STRING.getTypeId())) ;
isStr.addNote("is a string" ) ;
// Equality
SqlExpr strEquals = new S_Equal(lexCol, new SqlConstant(str)) ;
isStr.addNote(getExpr().toString()) ;
return new S_And(isStr, strEquals) ;
}
// // --- starts-with
// private static ExprPattern startsWith1 = new ExprPattern("fn:starts-with(?a1, ?a2)",
// new String[]{ "a1" , "a2" },
// new Action[]{ new ActionMatchVar() ,
// new ActionMatchString()}) ;
//
// private static ExprPattern startsWith2 = new ExprPattern("fn:starts-with(str(?a1), ?a2)",
// new String[]{ "a1" , "a2" },
// new Action[]{ new ActionMatchVar() ,
// new ActionMatchString()}) ;
}
/*
* (c) Copyright 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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