/*
* 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 com.hp.hpl.jena.sparql.algebra.table ;
import com.hp.hpl.jena.query.ResultSet ;
import com.hp.hpl.jena.query.ResultSetFactory ;
import com.hp.hpl.jena.sparql.algebra.Table ;
import com.hp.hpl.jena.sparql.engine.QueryIterator ;
import com.hp.hpl.jena.sparql.engine.ResultSetStream ;
import com.hp.hpl.jena.sparql.engine.binding.Binding ;
import com.hp.hpl.jena.sparql.engine.binding.BindingBase ;
import com.hp.hpl.jena.sparql.engine.binding.BindingUtils ;
import com.hp.hpl.jena.sparql.engine.ref.Evaluator ;
public abstract class TableBase implements Table {
protected TableBase() {}
@Override
final public void close() {
closeTable() ;
}
protected abstract void closeTable() ;
final public Table eval(Evaluator evaluator) {
return this ;
}
@Override
public void addBinding(Binding binding) {
throw new UnsupportedOperationException("Table.add") ;
}
@Override
public boolean contains(Binding b) {
QueryIterator qIter = iterator(null) ;
try {
for (; qIter.hasNext();) {
Binding b2 = qIter.nextBinding() ;
if ( BindingUtils.equals(b, b2) )
return true ;
}
return false ;
} finally {
qIter.close() ;
}
}
@Override
public abstract int size() ;
@Override
public abstract boolean isEmpty() ;
@Override
public ResultSet toResultSet() {
QueryIterator qIter = iterator(null) ;
ResultSet rs = new ResultSetStream(getVarNames(), null, qIter) ;
rs = ResultSetFactory.makeRewindable(rs) ;
qIter.close() ;
return rs ;
}
@Override
public String toString() {
return TableWriter.asSSE(this) ;
}
@Override
public int hashCode() {
int hash = 0 ;
QueryIterator qIter = iterator(null) ;
try {
for (; qIter.hasNext();) {
Binding binding = qIter.nextBinding() ;
hash ^= binding.hashCode() ;
}
return hash ;
} finally {
qIter.close() ;
}
}
@Override
public boolean equals(Object other) {
if ( this == other )
return true ;
if ( !(other instanceof Table) )
return false ;
Table table = (Table)other ;
if ( table.size() != this.size() )
return false ;
QueryIterator qIter1 = iterator(null) ;
QueryIterator qIter2 = table.iterator(null) ;
try {
for (; qIter1.hasNext();) {
Binding bind1 = qIter1.nextBinding() ;
Binding bind2 = qIter2.nextBinding() ;
if ( !BindingBase.equals(bind1, bind2) )
return false ;
}
return true ;
} finally {
qIter1.close() ;
qIter2.close() ;
}
}
}