content: /*
   * 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.cassandra.index.sasi.analyzer;
  
  import java.nio.ByteBuffer;
  import java.text.Normalizer;
  import java.util.Iterator;
  import java.util.Map;
  
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.schema.ColumnMetadata;
  
  public abstract class AbstractAnalyzer implements Iterator<ByteBuffer>
  {
      protected ByteBuffer next = null;
  
      public ByteBuffer next()
      {
          return next;
      }
  
      public void remove()
      {
          throw new UnsupportedOperationException();
      }
  
      public void validate(Map<String, String> options, ColumnMetadata cm) throws ConfigurationException
      {
          if (!isCompatibleWith(cm.type))
              throw new ConfigurationException(String.format("%s does not support type %s",
                                                             this.getClass().getSimpleName(),
                                                             cm.type.asCQL3Type()));
      }
  
      public abstract void init(Map<String, String> options, AbstractType<?> validator);
  
      public abstract void reset(ByteBuffer input);
  
      /**
       * Test whether the given validator is compatible with the underlying analyzer.
       *
       * @param validator the validator to test the compatibility with
       * @return true if the give validator is compatible, false otherwise
       */
      protected abstract boolean isCompatibleWith(AbstractType<?> validator);
  
      /**
       * @return true if current analyzer provides text tokenization, false otherwise.
       */
      public boolean isTokenizing()
      {
          return false;
      }
  
      public static String normalize(String original)
      {
          return Normalizer.isNormalized(original, Normalizer.Form.NFC)
                  ? original
                  : Normalizer.normalize(original, Normalizer.Form.NFC);
      }
  }
  