/*
* 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.arq.querybuilder.handlers;
import java.util.Collection ;
import java.util.List ;
import java.util.Map ;
import org.apache.jena.graph.Node ;
import org.apache.jena.query.Query ;
import org.apache.jena.sparql.core.Var ;
/**
* Handler for a dataset.
*
*/
public class DatasetHandler implements Handler {
// the query to manage
private final Query query;
/**
* Constructor.
* @param query The query the handler will manage.
*/
public DatasetHandler(Query query) {
this.query = query;
}
/**
* Add all the dataset information from the handler argument.
* @param datasetHandler The handler to copy from.
*/
public void addAll(DatasetHandler datasetHandler) {
from(datasetHandler.query.getGraphURIs());
fromNamed(datasetHandler.query.getNamedGraphURIs());
}
/**
* Add a graph name to the from named list.
* @param graphName The graph name to add.
*/
public void fromNamed(String graphName) {
query.addNamedGraphURI(graphName);
}
/**
* Add the graph names to the from named list.
*
* The names are ordered in as defined in the collection.
*
* @param graphNames The from names to add.
*/
public void fromNamed(Collection<String> graphNames) {
for (String uri : graphNames) {
query.addNamedGraphURI(uri);
}
}
/**
* Add the graph names to the from list.
* @param graphName the name to add.
*/
public void from(String graphName) {
query.addGraphURI(graphName);
}
/**
* Add the graph names to the named list.
*
* The names are ordered in as defined in the collection.
*
* @param graphNames The names to add.
*/
public void from(Collection<String> graphNames) {
for (String uri : graphNames) {
query.addGraphURI(uri);
}
}
/**
* Set the variables for field names that contain lists of strings.
*
* Strings that start with "?" are assumed to be variable names and will be replaced
* with matching node.toString() values.
*
* @param values The values to set.
* @param fieldName The field name in Query that contain a list of strings.
*/
private void setVars(Map<Var, Node> values, List<String> lst) {
if (values.isEmpty() || lst == null || lst.isEmpty() ) {
return;
}
for (int i =0;i<lst.size();i++)
{
String s = lst.get(i);
Node n = null;
if (s.startsWith("?")) {
Var v = Var.alloc(s.substring(1));
n = values.get(v);
lst.set( i , n == null ? s : n.toString());
}
}
}
@Override
public void setVars(Map<Var, Node> values) {
setVars(values, query.getNamedGraphURIs());
setVars(values, query.getGraphURIs());
}
@Override
public void build() {
// nothing special to do
}
}