/**
* 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.mahout.common.iterator;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;
import com.google.common.base.Function;
import com.google.common.collect.ForwardingIterator;
import com.google.common.collect.Iterators;
import org.apache.mahout.common.Pair;
public class StringRecordIterator extends ForwardingIterator<Pair<List<String>,Long>> {
private static final Long ONE = 1L;
private final Pattern splitter;
private final Iterator<Pair<List<String>,Long>> delegate;
public StringRecordIterator(Iterable<String> stringIterator, String pattern) {
this.splitter = Pattern.compile(pattern);
delegate = Iterators.transform(
stringIterator.iterator(),
new Function<String,Pair<List<String>,Long>>() {
@Override
public Pair<List<String>,Long> apply(String from) {
String[] items = splitter.split(from);
return new Pair<List<String>,Long>(Arrays.asList(items), ONE);
}
});
}
@Override
protected Iterator<Pair<List<String>,Long>> delegate() {
return delegate;
}
}