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.solr.schema;
  
  /**
   * <code>CopyField</code> contains all the information of a valid copy fields in an index.
   * 
   * @since solr 1.4
   */
  public class CopyField {
  
    private final SchemaField source;
    private final SchemaField destination;
    private final int maxChars;
    public static final int UNLIMITED = 0;
  
    public CopyField(final SchemaField source, final SchemaField destination) {
      this(source, destination, UNLIMITED);
    }
  
    /**
     * @param source The SchemaField of the source field.
     * @param destination The SchemaField of the destination field.
     * @param maxChars Maximum number of chars in source field to copy to destination field.
     * If equal to 0, there is no limit.
     */
    public CopyField(final SchemaField source, final SchemaField destination,
        final int maxChars) {
      if (source == null || destination == null) {
        throw new IllegalArgumentException(
            "Source or Destination SchemaField can't be NULL.");
      }
      if (maxChars < 0) {
        throw new IllegalArgumentException(
            "Attribute maxChars can't have a negative value.");
      }
      this.source = source;
      this.destination = destination;
      this.maxChars = maxChars;
    }
    
    public String getLimitedValue( final String val ){
      return maxChars == UNLIMITED || val.length() < maxChars ?
          val : val.substring( 0, maxChars );
    }
  
    /**
     * @return source SchemaField
     */
    public SchemaField getSource() {
      return source;
    }
  
    /**
     * @return destination SchemaField
     */
    public SchemaField getDestination() {
      return destination;
    }
  
    /**
     * @return tha maximum number of chars in source field to copy to destination field.
     */
    public int getMaxChars() {
      return maxChars;
    }
  }
  