/*
* 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.stanbol.entityhub.indexing.geonames;
import java.util.Iterator;
import java.util.StringTokenizer;
public class LineTokenizer implements Iterator<String>{
private static final String DELIM ="\t";
private final StringTokenizer t;
private boolean prevElementWasNull = true;
public LineTokenizer(String data){
t = new StringTokenizer(data, DELIM, true);
}
@Override
public boolean hasNext() {
return t.hasMoreTokens();
}
@Override
public String next() {
if(!prevElementWasNull){
t.nextElement();//dump the delim
}
if(!t.hasMoreElements()){
//this indicated, that the current Element is
// - the last Element
// - and is null
prevElementWasNull = true;
return null;
} else {
String act = t.nextToken();
if(DELIM.equals(act)){
prevElementWasNull = true;
return null;
} else {
prevElementWasNull = false;
return act;
}
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}