/*
* 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.base.Charsets;
import org.apache.mahout.math.map.OpenIntIntHashMap;
import com.google.common.base.Preconditions;
public class CachingContinuousValueEncoder extends ContinuousValueEncoder {
private final int dataSize;
private OpenIntIntHashMap[] caches;
public CachingContinuousValueEncoder(String name, int dataSize) {
super(name);
this.dataSize = dataSize;
initCaches();
}
private void initCaches() {
this.caches = new OpenIntIntHashMap[getProbes()];
for (int ii = 0; ii < getProbes(); ii++) {
caches[ii] = new OpenIntIntHashMap();
}
}
protected OpenIntIntHashMap[] getCaches() {
return caches;
}
@Override
public void setProbes(int probes) {
super.setProbes(probes);
initCaches();
}
protected int hashForProbe(String originalForm, int dataSize, String name, int probe) {
Preconditions.checkArgument(dataSize == this.dataSize,
"dataSize argument [" + dataSize + "] does not match expected dataSize [" + this.dataSize + ']');
if (caches[probe].containsKey(originalForm.hashCode())) {
return caches[probe].get(originalForm.hashCode());
}
int hash = hashForProbe(originalForm.getBytes(Charsets.UTF_8), dataSize, name, probe);
caches[probe].put(originalForm.hashCode(), hash);
return hash;
}
}