lucene/core/src/java/org/apache/lucene/document/StringField.java

/*
 * 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.lucene.document;


import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.util.BytesRef;

/** A field that is indexed but not tokenized: the entire
 *  String value is indexed as a single token.  For example
 *  this might be used for a 'country' field or an 'id'
 *  field.  If you also need to sort on this field, separately
 *  add a {@link SortedDocValuesField} to your document. */

public final class StringField extends Field {

  /** Indexed, not tokenized, omits norms, indexes
   *  DOCS_ONLY, not stored. */
  public static final FieldType TYPE_NOT_STORED = new FieldType();

  /** Indexed, not tokenized, omits norms, indexes
   *  DOCS_ONLY, stored */
  public static final FieldType TYPE_STORED = new FieldType();

  static {
    TYPE_NOT_STORED.setOmitNorms(true);
    TYPE_NOT_STORED.setIndexOptions(IndexOptions.DOCS);
    TYPE_NOT_STORED.setTokenized(false);
    TYPE_NOT_STORED.freeze();

    TYPE_STORED.setOmitNorms(true);
    TYPE_STORED.setIndexOptions(IndexOptions.DOCS);
    TYPE_STORED.setStored(true);
    TYPE_STORED.setTokenized(false);
    TYPE_STORED.freeze();
  }

  /** Creates a new textual StringField, indexing the provided String value
   *  as a single token.
   *
   *  @param name field name
   *  @param value String value
   *  @param stored Store.YES if the content should also be stored
   *  @throws IllegalArgumentException if the field name or value is null.
   */
  public StringField(String name, String value, Store stored) {
    super(name, value, stored == Store.YES ? TYPE_STORED : TYPE_NOT_STORED);
  }

  /** Creates a new binary StringField, indexing the provided binary (BytesRef)
   *  value as a single token.
   *
   *  @param name field name
   *  @param value BytesRef value.  The provided value is not cloned so
   *         you must not change it until the document(s) holding it
   *         have been indexed.
   *  @param stored Store.YES if the content should also be stored
   *  @throws IllegalArgumentException if the field name or value is null.
   */
  public StringField(String name, BytesRef value, Store stored) {
    super(name, value, stored == Store.YES ? TYPE_STORED : TYPE_NOT_STORED);
  }
}