/*
* 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.tdb.solver;
import java.util.HashMap;
import java.util.Iterator ;
import java.util.Map;
import org.apache.jena.atlas.lib.Map2 ;
import com.hp.hpl.jena.sparql.core.Var;
import com.hp.hpl.jena.sparql.engine.binding.Binding ;
import com.hp.hpl.jena.tdb.store.NodeId;
/** Class for a Binding-like structure except it works on NodeIds, not on Nodes */
public class BindingNodeId extends Map2<Var, NodeId>
{
// This is the parent binding - which may be several steps up the chain.
// This just carried around for later use when we go BindingNodeId back to Binding.
private final Binding parentBinding ;
// Possible optimization: there are at most 3 possible values so HashMap is overkill.
// Use a chain of small objects.
private BindingNodeId(Map<Var, NodeId> map1, Map2<Var, NodeId> map2, Binding parentBinding)
{
super(map1, map2) ;
this.parentBinding = parentBinding ;
}
// Make from an existing BindingNodeId
public BindingNodeId(BindingNodeId other)
{
this(new HashMap<Var, NodeId>(), other, other.getParentBinding()) ;
}
// Make from an existing Binding
public BindingNodeId(Binding binding)
{
this(new HashMap<Var, NodeId>(), null, binding) ;
}
public BindingNodeId()
{
this(new HashMap<Var, NodeId>(), null, null) ;
}
public Binding getParentBinding() { return parentBinding ; }
//@Override public NodeId get(Var v) { return super.get(v) ; }
@Override public void put(Var v, NodeId n)
{
if ( v == null || n == null )
throw new IllegalArgumentException("("+v+","+n+")") ;
super.put(v, n) ;
}
public void putAll(BindingNodeId other)
{
Iterator<Var> vIter = other.iterator() ;
for ( ; vIter.hasNext() ; )
{
Var v = vIter.next() ;
if ( v == null )
throw new IllegalArgumentException("Null key") ;
NodeId n = other.get(v) ;
if ( n == null )
throw new IllegalArgumentException("("+v+","+n+")") ;
super.put(v, n) ;
}
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder() ;
boolean first = true ;
for ( Var v : this )
{
if ( ! first )
sb.append(" ") ;
first = false ;
NodeId x = get(v) ;
sb.append(v) ;
sb.append(" = ") ;
sb.append(x) ;
}
return sb.toString() ;
}
}