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A set of utilities and tools to speed up and ease programming in Java.

There is a newer version: 0.5

/*
 * (c) 2005 David B. Bracewell
 *
 * 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 com.davidbracewell.io;

import com.google.common.base.Preconditions;

import java.io.ByteArrayInputStream;
import java.nio.charset.Charset;

/**
 * Convenience method for detecting the character set of a byte array
 *
 * @author David B. Bracewell
 */
public class CharsetDetector {


  /**
   * Detects the character set for the buffer.
   *
   * @param buffer The buffer
   * @param offset where to start
   * @param length the length to read
   * @return The detected charset or null
   */
  public static Charset detect(byte[] buffer, int offset, int length) {
    Preconditions.checkNotNull(buffer);
    Preconditions.checkArgument(length > 0);
    Preconditions.checkArgument(offset >= 0);

   final com.ibm.icu.text.CharsetDetector detector = new com.ibm.icu.text.CharsetDetector();
    try {
      detector.setText(new ByteArrayInputStream(buffer, offset, length));
      return Charset.forName(detector.detect().getName());
    } catch (Exception e) {
      return null;
    }
  }

}// END OF CharsetDetector