| /* |
| * 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.language; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| /** |
| * Writer that builds a language profile based on all the written content. |
| * |
| * @since Apache Tika 0.5 |
| */ |
| public class ProfilingWriter extends Writer { |
| |
| private final LanguageProfile profile; |
| |
| private char[] buffer = new char[] { 0, 0, '_' }; |
| |
| private int n = 1; |
| |
| public ProfilingWriter(LanguageProfile profile) { |
| this.profile = profile; |
| } |
| |
| public ProfilingWriter() { |
| this(new LanguageProfile()); |
| } |
| |
| /** |
| * Returns the language profile being built by this writer. Note that |
| * the returned profile gets updated whenever new characters are written. |
| * Use the {@link #getLanguage()} method to get the language that best |
| * matches the current state of the profile. |
| * |
| * @return language profile |
| */ |
| public LanguageProfile getProfile() { |
| return profile; |
| } |
| |
| /** |
| * Returns the language that best matches the current state of the |
| * language profile. |
| * |
| * @return language that best matches the current profile |
| */ |
| public LanguageIdentifier getLanguage() { |
| return new LanguageIdentifier(profile); |
| } |
| |
| @Override |
| public void write(char[] cbuf, int off, int len) { |
| for (int i = 0; i < len; i++) { |
| char c = Character.toLowerCase(cbuf[off + i]); |
| if (Character.isLetter(c)) { |
| addLetter(c); |
| } else { |
| addSeparator(); |
| } |
| } |
| } |
| |
| private void addLetter(char c) { |
| System.arraycopy(buffer, 1, buffer, 0, buffer.length - 1); |
| buffer[buffer.length - 1] = c; |
| n++; |
| if (n >= buffer.length) { |
| profile.add(new String(buffer)); |
| } |
| } |
| |
| private void addSeparator() { |
| addLetter('_'); |
| n = 1; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| addSeparator(); |
| } |
| |
| /** |
| * Ignored. |
| */ |
| @Override |
| public void flush() { |
| } |
| |
| } |