code: package it.unibz.inf.ontop.dbschema.impl;
  
  
  /*
   * #%L
   * ontop-obdalib-core
   * %%
   * Copyright (C) 2009 - 2014 Free University of Bozen-Bolzano
   * %%
   * Licensed 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.
   * #L%
   */
  
  import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.databind.JsonSerializer;
  import com.fasterxml.jackson.databind.SerializerProvider;
  import it.unibz.inf.ontop.dbschema.QuotedID;
  
  import javax.annotation.Nonnull;
  import java.io.IOException;
  
  
  /**
   * Database identifier used for schema names, table names and aliases
   *
   * An identifier can be in quotation marks (to preserve the case etc.).
   * Quotation, however, is ignored when identifiers are compared
   *
   * @author Roman Kontchakov
   *
   */
  
  
  public class QuotedIDImpl implements QuotedID {
  
      private final String id;
      private final String quoteString;
      private final boolean caseSensitive;
      private final int hashCode;
  
      /**
       * (used only in QuotedIDFactory implementations)
       *
       * @param id can be null
       * @param quoteString cannot be null (the empty string stands for no quotation, as in getIdentifierQuoteString)
       */
      QuotedIDImpl(@Nonnull String id, String quoteString) {
          this(id, quoteString, true);
      }
  
      QuotedIDImpl(@Nonnull String id, String quoteString, boolean caseSensitive) {
          this.id = id;
          this.quoteString = quoteString;
          this.caseSensitive = caseSensitive;
          // increases collisions but makes it possible to have case-insensitive ids (for MySQL)
          this.hashCode = id.toLowerCase().hashCode();
      }
  
      /**
       * returns the identifier (stripped of quotation marks)
       *
       * @return identifier without quotation marks (for comparison etc.)
       */
  
      @Nonnull
      @Override
      public String getName() {
          return id;
      }
  
      /**
       * returns SQL rendering of the identifier, in quotes, if necessary
       *
       * @return identifier possibly in quotes
       */
  
      @Nonnull
      @Override
      public String getSQLRendering() {
          return quoteString + id + quoteString;
      }
  
      @Override
      public String toString() {
          return getSQLRendering();
      }
  
      /**
       * compares two identifiers ignoring quotation
       */
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj)
              return true;
  
          if (obj instanceof QuotedIDImpl)  {
              QuotedIDImpl other = (QuotedIDImpl)obj;
              if (this.id.length() != other.id.length())
                  return false;
  
              return this.id.regionMatches(
                      !this.caseSensitive || !other.caseSensitive,
                      0,
                      other.id,
                      0,
                      this.id.length());
          }
          return false;
      }
  
      @Override
      public int hashCode() {
          return hashCode;
      }
  
      public static class QuotedIDSerializer extends JsonSerializer<QuotedID> {
          @Override
          public void serialize(QuotedID value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
              gen.writeString(value.getSQLRendering());
          }
      }
  }
  