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/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package studio.raptor.sqlparser.fast.value;

import studio.raptor.sqlparser.fast.engine.SysProperties;
import studio.raptor.sqlparser.fast.util.StringUtils;

/**
 * Implementation of the VARCHAR_IGNORECASE data type.
 */
public class ValueStringIgnoreCase extends ValueString {

  private static final ValueStringIgnoreCase EMPTY =
      new ValueStringIgnoreCase("");
  private int hash;

  protected ValueStringIgnoreCase(String value) {
    super(value);
  }

  /**
   * Get or create a case insensitive string value for the given string.
   * The value will have the same case as the passed string.
   *
   * @param s the string
   * @return the value
   */
  public static ValueStringIgnoreCase get(String s) {
    if (s.length() == 0) {
      return EMPTY;
    }
    ValueStringIgnoreCase obj = new ValueStringIgnoreCase(StringUtils.cache(s));
    if (s.length() > SysProperties.OBJECT_CACHE_MAX_PER_ELEMENT_SIZE) {
      return obj;
    }
    ValueStringIgnoreCase cache = (ValueStringIgnoreCase) cache(obj);
    // the cached object could have the wrong case
    // (it would still be 'equal', but we don't like to store it)
    if (cache.value.equals(s)) {
      return cache;
    }
    return obj;
  }

  @Override
  public int getType() {
    return STRING_IGNORECASE;
  }

  @Override
  protected int compareSecure(Value o, CompareMode mode) {
    ValueStringIgnoreCase v = (ValueStringIgnoreCase) o;
    return mode.compareString(value, v.value, true);
  }

  @Override
  public boolean equals(Object other) {
    return other instanceof ValueString
        && value.equalsIgnoreCase(((ValueString) other).value);
  }

  @Override
  public int hashCode() {
    if (hash == 0) {
      // this is locale sensitive
      hash = value.toUpperCase().hashCode();
    }
    return hash;
  }

  @Override
  public String getSQL() {
    return "CAST(" + StringUtils.quoteStringSQL(value) + " AS VARCHAR_IGNORECASE)";
  }

  @Override
  protected ValueString getNew(String s) {
    return ValueStringIgnoreCase.get(s);
  }

}