/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.sparql.expr.aggregate;
import java.util.Objects;
import org.apache.jena.graph.Node ;
import org.apache.jena.sparql.engine.binding.Binding ;
import org.apache.jena.sparql.expr.Expr ;
import org.apache.jena.sparql.expr.ExprList ;
import org.apache.jena.sparql.expr.NodeValue ;
import org.apache.jena.sparql.function.FunctionEnv ;
import org.apache.jena.sparql.serializer.SerializationContext ;
public class AggGroupConcatDistinct extends AggregatorBase
{
private final String separator ;
private final String effectiveSeparator ;
public AggGroupConcatDistinct(Expr expr, String separator)
{
this(expr,
( separator != null ) ? separator : AggGroupConcat.SeparatorDefault ,
separator) ;
}
private AggGroupConcatDistinct(Expr expr, String effectiveSeparator, String separatorSeen)
{
super("GROUP_CONCAT", true, expr) ;
this.separator = separatorSeen ;
this.effectiveSeparator = effectiveSeparator ;
}
@Override
public Aggregator copy(ExprList exprs) { return new AggGroupConcatDistinct(exprs.get(0), effectiveSeparator, separator) ; }
@Override
public String toPrefixString() {
return AggGroupConcat.prefixGroupConcatString(super.isDistinct, separator, getExprList()) ;
}
@Override
public String asSparqlExpr(SerializationContext sCxt) {
return AggGroupConcat.asSparqlExpr(isDistinct, separator, exprList, sCxt) ;
}
@Override
public Accumulator createAccumulator()
{
return new AccGroupConcatDistinct(getExpr(), effectiveSeparator) ;
}
public String getSeparator() { return separator ; }
@Override
public Node getValueEmpty() { return null ; }
@Override
public int hashCode() { return HC_AggCountVar ^ getExpr().hashCode() ; }
@Override
public boolean equals(Aggregator other, boolean bySyntax) {
if ( other == null ) return false ;
if ( this == other ) return true ;
if ( ! ( other instanceof AggGroupConcatDistinct ) )
return false ;
AggGroupConcatDistinct agg = (AggGroupConcatDistinct)other ;
return Objects.equals(agg.getSeparator(),getSeparator()) &&
agg.getExpr().equals(getExpr(), bySyntax) ;
}
// ---- Accumulator
static class AccGroupConcatDistinct extends AccumulatorExpr
{
private StringBuilder stringSoFar = new StringBuilder() ;
private boolean first = true ;
private final String separator ;
public AccGroupConcatDistinct(Expr expr, String sep) {
super(expr, true);
this.separator = sep;
}
@Override
public void accumulate(NodeValue nv, Binding binding, FunctionEnv functionEnv)
{
String str = nv.asString() ;
if ( ! first )
stringSoFar.append(separator) ;
stringSoFar.append(str) ;
first = false ;
}
@Override
protected void accumulateError(Binding binding, FunctionEnv functionEnv)
{}
@Override
public NodeValue getAccValue()
{ return NodeValue.makeString(stringSoFar.toString()) ; }
}
}