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/*
* 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.vectorizer.encoders;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import java.util.List;
import java.util.Map;
/**
* Assigns integer codes to strings as they appear.
*/
public class Dictionary {
private final Map dict = Maps.newLinkedHashMap();
public int intern(String s) {
if (!dict.containsKey(s)) {
dict.put(s, dict.size());
}
return dict.get(s);
}
public List values() {
// order of keySet is guaranteed to be insertion order
return Lists.newArrayList(dict.keySet());
}
public int size() {
return dict.size();
}
public static Dictionary fromList(Iterable values) {
Dictionary dict = new Dictionary();
for (String value : values) {
dict.intern(value);
}
return dict;
}
}
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