org.apache.tika.eval.textstats.UnicodeBlockCounter Maven / Gradle / Ivy
/*
* 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.tika.eval.textstats;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang3.mutable.MutableInt;
import org.apache.tika.eval.AbstractProfiler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class UnicodeBlockCounter implements StringStatsCalculator> {
private static final Logger LOG = LoggerFactory.getLogger(AbstractProfiler.class);
private final int maxContentLength;
public UnicodeBlockCounter(int maxContentLength) {
this.maxContentLength = maxContentLength;
}
@Override
public Map calculate(String txt) {
if (txt.length() < 200) {
return Collections.EMPTY_MAP;
}
String s = txt;
if (s.length() > maxContentLength) {
s = s.substring(0, maxContentLength);
}
Map m = new HashMap<>();
Reader r = new StringReader(s);
try {
int c = r.read();
while (c != -1) {
Character.UnicodeBlock block = Character.UnicodeBlock.of(c);
String blockString = (block == null) ? "NULL" : block.toString();
MutableInt i = m.get(blockString);
if (i == null) {
i = new MutableInt(0);
m.put(blockString, i);
}
i.increment();
if (block == null) {
blockString = "NULL";
}
m.put(blockString, i);
c = r.read();
}
} catch (IOException e) {
LOG.warn("IOException", e);
}
return m;
}
}