gt:         return ((this.colFlag & 2) > 0);
context: /*
    Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved.
  
    The MySQL Connector/J is licensed under the terms of the GPLv2
    <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
    There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
    this software, see the FLOSS License Exception
    <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
  
    This program is free software; you can redistribute it and/or modify it under the terms
    of the GNU General Public License as published by the Free Software Foundation; version 2
    of the License.
  
    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    See the GNU General Public License for more details.
  
    You should have received a copy of the GNU General Public License along with this
    program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
    Floor, Boston, MA 02110-1301  USA
  
   */
  
  package com.mysql.jdbc;
  
  import java.io.UnsupportedEncodingException;
  import java.sql.SQLException;
  import java.sql.Types;
  import java.util.regex.PatternSyntaxException;
  
  /**
   * Field is a class used to describe fields in a ResultSet
   */
  public class Field {
  
      private static final int AUTO_INCREMENT_FLAG = 512;
  
      private static final int NO_CHARSET_INFO = -1;
  
      private byte[] buffer;
  
      private int collationIndex = 0;
  
      private String encoding = null;
  
      private int colDecimals;
  
      private short colFlag;
  
      private String collationName = null;
  
      private MySQLConnection connection = null;
  
      private String databaseName = null;
  
      private int databaseNameLength = -1;
  
      // database name info
      private int databaseNameStart = -1;
  
      protected int defaultValueLength = -1;
  
      // default value info - from COM_LIST_FIELDS execution
      protected int defaultValueStart = -1;
  
      private String fullName = null;
  
      private String fullOriginalName = null;
  
      private boolean isImplicitTempTable = false;
  
      private long length; // Internal length of the field;
  
      private int mysqlType = -1; // the MySQL type
  
      private String name; // The Field name
  
      private int nameLength;
  
      private int nameStart;
  
      private String originalColumnName = null;
  
      private int originalColumnNameLength = -1;
  
      // column name info (before aliasing)
      private int originalColumnNameStart = -1;
  
      private String originalTableName = null;
  
      private int originalTableNameLength = -1;
  
      // table name info (before aliasing)
      private int originalTableNameStart = -1;
  
      private int precisionAdjustFactor = 0;
  
      private int sqlType = -1; // the java.sql.Type
  
      private String tableName; // The Name of the Table
  
      private int tableNameLength;
  
      private int tableNameStart;
  
      private boolean useOldNameMetadata = false;
  
      private boolean isSingleBit;
  
      private int maxBytesPerChar;
  
      private final boolean valueNeedsQuoting;
  
      /**
       * Constructor used when communicating with 4.1 and newer servers
       */
      Field(MySQLConnection conn, byte[] buffer, int databaseNameStart, int databaseNameLength, int tableNameStart, int tableNameLength,
              int originalTableNameStart, int originalTableNameLength, int nameStart, int nameLength, int originalColumnNameStart, int originalColumnNameLength,
              long length, int mysqlType, short colFlag, int colDecimals, int defaultValueStart, int defaultValueLength, int charsetIndex) throws SQLException {
          this.connection = conn;
          this.buffer = buffer;
          this.nameStart = nameStart;
          this.nameLength = nameLength;
          this.tableNameStart = tableNameStart;
          this.tableNameLength = tableNameLength;
          this.length = length;
          this.colFlag = colFlag;
          this.colDecimals = colDecimals;
          this.mysqlType = mysqlType;
  
          // 4.1 field info...
          this.databaseNameStart = databaseNameStart;
          this.databaseNameLength = databaseNameLength;
  
          this.originalTableNameStart = originalTableNameStart;
          this.originalTableNameLength = originalTableNameLength;
  
          this.originalColumnNameStart = originalColumnNameStart;
          this.originalColumnNameLength = originalColumnNameLength;
  
          this.defaultValueStart = defaultValueStart;
          this.defaultValueLength = defaultValueLength;
  
          // If we're not running 4.1 or newer, use the connection's charset
          this.collationIndex = charsetIndex;
  
          // Map MySqlTypes to java.sql Types
          this.sqlType = MysqlDefs.mysqlToJavaType(this.mysqlType);
  
          checkForImplicitTemporaryTable();
          // Re-map to 'real' blob type, if we're a BLOB
          boolean isFromFunction = this.originalTableNameLength == 0;
  
          if (this.mysqlType == MysqlDefs.FIELD_TYPE_BLOB) {
              if (this.connection != null && this.connection.getBlobsAreStrings() || (this.connection.getFunctionsNeverReturnBlobs() && isFromFunction)) {
                  this.sqlType = Types.VARCHAR;
                  this.mysqlType = MysqlDefs.FIELD_TYPE_VARCHAR;
              } else if (this.collationIndex == CharsetMapping.MYSQL_COLLATION_INDEX_binary || !this.connection.versionMeetsMinimum(4, 1, 0)) {
                  if (this.connection.getUseBlobToStoreUTF8OutsideBMP() && shouldSetupForUtf8StringInBlob()) {
                      setupForUtf8StringInBlob();
                  } else {
                      setBlobTypeBasedOnLength();
                      this.sqlType = MysqlDefs.mysqlToJavaType(this.mysqlType);
                  }
              } else {
                  // *TEXT masquerading as blob
                  this.mysqlType = MysqlDefs.FIELD_TYPE_VAR_STRING;
                  this.sqlType = Types.LONGVARCHAR;
              }
          }
  
          if (this.sqlType == Types.TINYINT && this.length == 1 && this.connection.getTinyInt1isBit()) {
              // Adjust for pseudo-boolean
              if (conn.getTinyInt1isBit()) {
                  if (conn.getTransformedBitIsBoolean()) {
                      this.sqlType = Types.BOOLEAN;
                  } else {
                      this.sqlType = Types.BIT;
                  }
              }
  
          }
  
          if (!isNativeNumericType() && !isNativeDateTimeType()) {
              this.encoding = this.connection.getEncodingForIndex(this.collationIndex);
  
              // ucs2, utf16, and utf32 cannot be used as a client character set, but if it was received from server under some circumstances we can parse them as
              // utf16
              if ("UnicodeBig".equals(this.encoding)) {
                  this.encoding = "UTF-16";
              }
  
              // Handle VARBINARY/BINARY (server doesn't have a different type for this
  
              boolean isBinary = isBinary();
  
              if (this.connection.versionMeetsMinimum(4, 1, 0) && this.mysqlType == MysqlDefs.FIELD_TYPE_VAR_STRING && isBinary
                      && this.collationIndex == CharsetMapping.MYSQL_COLLATION_INDEX_binary) {
                  if (this.connection != null && (this.connection.getFunctionsNeverReturnBlobs() && isFromFunction)) {
                      this.sqlType = Types.VARCHAR;
                      this.mysqlType = MysqlDefs.FIELD_TYPE_VARCHAR;
                  } else if (this.isOpaqueBinary()) {
                      this.sqlType = Types.VARBINARY;
                  }
              }
  
              if (this.connection.versionMeetsMinimum(4, 1, 0) && this.mysqlType == MysqlDefs.FIELD_TYPE_STRING && isBinary
                      && this.collationIndex == CharsetMapping.MYSQL_COLLATION_INDEX_binary) {
                  //
                  // Okay, this is a hack, but there's currently no way to easily distinguish something like DATE_FORMAT( ..) from the "BINARY" column type, other
                  // than looking at the original column name.
                  //
  
                  if (isOpaqueBinary() && !this.connection.getBlobsAreStrings()) {
                      this.sqlType = Types.BINARY;
                  }
              }
  
              if (this.mysqlType == MysqlDefs.FIELD_TYPE_BIT) {
                  this.isSingleBit = (this.length == 0);
  
                  if (this.connection != null && (this.connection.versionMeetsMinimum(5, 0, 21) || this.connection.versionMeetsMinimum(5, 1, 10))
                          && this.length == 1) {
                      this.isSingleBit = true;
                  }
  
                  if (this.isSingleBit) {
                      this.sqlType = Types.BIT;
                  } else {
                      this.sqlType = Types.VARBINARY;
                      this.colFlag |= 128; // we need to pretend this is a full
                      this.colFlag |= 16; // binary blob
                      isBinary = true;
                  }
              }
  
              //
              // Handle TEXT type (special case), Fix proposed by Peter McKeown
              //
              if ((this.sqlType == java.sql.Types.LONGVARBINARY) && !isBinary) {
                  this.sqlType = java.sql.Types.LONGVARCHAR;
              } else if ((this.sqlType == java.sql.Types.VARBINARY) && !isBinary) {
                  this.sqlType = java.sql.Types.VARCHAR;
              }
          } else {
              this.encoding = "US-ASCII";
          }
  
          //
          // Handle odd values for 'M' for floating point/decimal numbers
          //
          if (!isUnsigned()) {
              switch (this.mysqlType) {
                  case MysqlDefs.FIELD_TYPE_DECIMAL:
                  case MysqlDefs.FIELD_TYPE_NEW_DECIMAL:
                      this.precisionAdjustFactor = -1;
  
                      break;
                  case MysqlDefs.FIELD_TYPE_DOUBLE:
                  case MysqlDefs.FIELD_TYPE_FLOAT:
                      this.precisionAdjustFactor = 1;
  
                      break;
              }
          } else {
              switch (this.mysqlType) {
                  case MysqlDefs.FIELD_TYPE_DOUBLE:
                  case MysqlDefs.FIELD_TYPE_FLOAT:
                      this.precisionAdjustFactor = 1;
  
                      break;
              }
          }
          this.valueNeedsQuoting = determineNeedsQuoting();
      }
  
      private boolean shouldSetupForUtf8StringInBlob() throws SQLException {
          String includePattern = this.connection.getUtf8OutsideBmpIncludedColumnNamePattern();
          String excludePattern = this.connection.getUtf8OutsideBmpExcludedColumnNamePattern();
  
          if (excludePattern != null && !StringUtils.isEmptyOrWhitespaceOnly(excludePattern)) {
              try {
                  if (getOriginalName().matches(excludePattern)) {
                      if (includePattern != null && !StringUtils.isEmptyOrWhitespaceOnly(includePattern)) {
                          try {
                              if (getOriginalName().matches(includePattern)) {
                                  return true;
                              }
                          } catch (PatternSyntaxException pse) {
                              SQLException sqlEx = SQLError.createSQLException("Illegal regex specified for \"utf8OutsideBmpIncludedColumnNamePattern\"",
                                      SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.connection.getExceptionInterceptor());
  
                              if (!this.connection.getParanoid()) {
                                  sqlEx.initCause(pse);
                              }
  
                              throw sqlEx;
                          }
                      }
  
                      return false;
                  }
              } catch (PatternSyntaxException pse) {
                  SQLException sqlEx = SQLError.createSQLException("Illegal regex specified for \"utf8OutsideBmpExcludedColumnNamePattern\"",
                          SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.connection.getExceptionInterceptor());
  
                  if (!this.connection.getParanoid()) {
                      sqlEx.initCause(pse);
                  }
  
                  throw sqlEx;
              }
          }
  
          return true;
      }
  
      private void setupForUtf8StringInBlob() {
          if (this.length == MysqlDefs.LENGTH_TINYBLOB || this.length == MysqlDefs.LENGTH_BLOB) {
              this.mysqlType = MysqlDefs.FIELD_TYPE_VARCHAR;
              this.sqlType = Types.VARCHAR;
          } else {
              this.mysqlType = MysqlDefs.FIELD_TYPE_VAR_STRING;
              this.sqlType = Types.LONGVARCHAR;
          }
  
          this.collationIndex = CharsetMapping.MYSQL_COLLATION_INDEX_utf8;
      }
  
      /**
       * Constructor used when communicating with pre 4.1 servers
       */
      Field(MySQLConnection conn, byte[] buffer, int nameStart, int nameLength, int tableNameStart, int tableNameLength, int length, int mysqlType,
              short colFlag, int colDecimals) throws SQLException {
          this(conn, buffer, -1, -1, tableNameStart, tableNameLength, -1, -1, nameStart, nameLength, -1, -1, length, mysqlType, colFlag, colDecimals, -1, -1,
                  NO_CHARSET_INFO);
      }
  
      /**
       * Constructor used by DatabaseMetaData methods.
       */
      Field(String tableName, String columnName, int jdbcType, int length) {
          this.tableName = tableName;
          this.name = columnName;
          this.length = length;
          this.sqlType = jdbcType;
          this.colFlag = 0;
          this.colDecimals = 0;
          this.valueNeedsQuoting = determineNeedsQuoting();
      }
  
      /**
       * Used by prepared statements to re-use result set data conversion methods
       * when generating bound parmeter retrieval instance for statement
       * interceptors.
       * 
       * @param tableName
       *            not used
       * @param columnName
       *            not used
       * @param charsetIndex
       *            the MySQL collation/character set index
       * @param jdbcType
       *            from java.sql.Types
       * @param length
       *            length in characters or bytes (for BINARY data).
       */
      Field(String tableName, String columnName, int charsetIndex, int jdbcType, int length) {
          this.tableName = tableName;
          this.name = columnName;
          this.length = length;
          this.sqlType = jdbcType;
          this.colFlag = 0;
          this.colDecimals = 0;
          this.collationIndex = charsetIndex;
          this.valueNeedsQuoting = determineNeedsQuoting();
  
          switch (this.sqlType) {
              case Types.BINARY:
              case Types.VARBINARY:
                  this.colFlag |= 128;
                  this.colFlag |= 16;
                  break;
          }
      }
  
      private void checkForImplicitTemporaryTable() {
          this.isImplicitTempTable = this.tableNameLength > 5 && this.buffer[this.tableNameStart] == (byte) '#'
                  && this.buffer[this.tableNameStart + 1] == (byte) 's' && this.buffer[this.tableNameStart + 2] == (byte) 'q'
                  && this.buffer[this.tableNameStart + 3] == (byte) 'l' && this.buffer[this.tableNameStart + 4] == (byte) '_';
      }
  
      /**
       * Returns the Java encoding (if known) for this field.
       * 
       * @return the Java encoding
       */
      public String getEncoding() throws SQLException {
          return this.encoding;
      }
  
      public void setEncoding(String javaEncodingName, Connection conn) throws SQLException {
          this.encoding = javaEncodingName;
          try {
              this.collationIndex = CharsetMapping.getCollationIndexForJavaEncoding(javaEncodingName, conn);
          } catch (RuntimeException ex) {
              SQLException sqlEx = SQLError.createSQLException(ex.toString(), SQLError.SQL_STATE_ILLEGAL_ARGUMENT, null);
              sqlEx.initCause(ex);
              throw sqlEx;
          }
      }
  
      public synchronized String getCollation() throws SQLException {
          if (this.collationName == null) {
              if (this.connection != null) {
                  if (this.connection.versionMeetsMinimum(4, 1, 0)) {
                      if (this.connection.getUseDynamicCharsetInfo()) {
                          java.sql.DatabaseMetaData dbmd = this.connection.getMetaData();
  
                          String quotedIdStr = dbmd.getIdentifierQuoteString();
  
                          if (" ".equals(quotedIdStr)) {
                              quotedIdStr = "";
                          }
  
                          String csCatalogName = getDatabaseName();
                          String csTableName = getOriginalTableName();
                          String csColumnName = getOriginalName();
  
                          if (csCatalogName != null && csCatalogName.length() != 0 && csTableName != null && csTableName.length() != 0 && csColumnName != null
                                  && csColumnName.length() != 0) {
                              StringBuffer queryBuf = new StringBuffer(csCatalogName.length() + csTableName.length() + 28);
                              queryBuf.append("SHOW FULL COLUMNS FROM ");
                              queryBuf.append(quotedIdStr);
                              queryBuf.append(csCatalogName);
                              queryBuf.append(quotedIdStr);
                              queryBuf.append(".");
                              queryBuf.append(quotedIdStr);
                              queryBuf.append(csTableName);
                              queryBuf.append(quotedIdStr);
  
                              java.sql.Statement collationStmt = null;
                              java.sql.ResultSet collationRs = null;
  
                              try {
                                  collationStmt = this.connection.createStatement();
  
                                  collationRs = collationStmt.executeQuery(queryBuf.toString());
  
                                  while (collationRs.next()) {
                                      if (csColumnName.equals(collationRs.getString("Field"))) {
                                          this.collationName = collationRs.getString("Collation");
  
                                          break;
                                      }
                                  }
                              } finally {
                                  if (collationRs != null) {
                                      collationRs.close();
                                      collationRs = null;
                                  }
  
                                  if (collationStmt != null) {
                                      collationStmt.close();
                                      collationStmt = null;
                                  }
                              }
                          }
                      } else {
                          try {
                              this.collationName = CharsetMapping.COLLATION_INDEX_TO_COLLATION_NAME[this.collationIndex];
                          } catch (RuntimeException ex) {
                              SQLException sqlEx = SQLError.createSQLException(ex.toString(), SQLError.SQL_STATE_ILLEGAL_ARGUMENT, null);
                              sqlEx.initCause(ex);
                              throw sqlEx;
                          }
                      }
                  }
              }
          }
  
          return this.collationName;
      }
  
      public String getColumnLabel() throws SQLException {
          return getName(); // column name if not aliased, alias if used
      }
  
      public String getDatabaseName() throws SQLException {
          if ((this.databaseName == null) && (this.databaseNameStart != -1) && (this.databaseNameLength != -1)) {
              this.databaseName = getStringFromBytes(this.databaseNameStart, this.databaseNameLength);
          }
  
          return this.databaseName;
      }
  
      int getDecimals() {
          return this.colDecimals;
      }
  
      public String getFullName() throws SQLException {
          if (this.fullName == null) {
              StringBuffer fullNameBuf = new StringBuffer(getTableName().length() + 1 + getName().length());
              fullNameBuf.append(this.tableName);
  
              // much faster to append a char than a String
              fullNameBuf.append('.');
              fullNameBuf.append(this.name);
              this.fullName = fullNameBuf.toString();
              fullNameBuf = null;
          }
  
          return this.fullName;
      }
  
      public String getFullOriginalName() throws SQLException {
          getOriginalName();
  
          if (this.originalColumnName == null) {
              return null; // we don't have this information
          }
  
          if (this.fullName == null) {
              StringBuffer fullOriginalNameBuf = new StringBuffer(getOriginalTableName().length() + 1 + getOriginalName().length());
              fullOriginalNameBuf.append(this.originalTableName);
  
              // much faster to append a char than a String
              fullOriginalNameBuf.append('.');
              fullOriginalNameBuf.append(this.originalColumnName);
              this.fullOriginalName = fullOriginalNameBuf.toString();
              fullOriginalNameBuf = null;
          }
  
          return this.fullOriginalName;
      }
  
      public long getLength() {
          return this.length;
      }
  
      public synchronized int getMaxBytesPerCharacter() throws SQLException {
          if (this.maxBytesPerChar == 0) {
              this.maxBytesPerChar = this.connection.getMaxBytesPerChar(this.collationIndex, getEncoding());
          }
          return this.maxBytesPerChar;
      }
  
      public int getMysqlType() {
          return this.mysqlType;
      }
  
      public String getName() throws SQLException {
          if (this.name == null) {
              this.name = getStringFromBytes(this.nameStart, this.nameLength);
          }
  
          return this.name;
      }
  
      public String getNameNoAliases() throws SQLException {
          if (this.useOldNameMetadata) {
              return getName();
          }
  
          if (this.connection != null && this.connection.versionMeetsMinimum(4, 1, 0)) {
              return getOriginalName();
          }
  
          return getName();
      }
  
      public String getOriginalName() throws SQLException {
          if ((this.originalColumnName == null) && (this.originalColumnNameStart != -1) && (this.originalColumnNameLength != -1)) {
              this.originalColumnName = getStringFromBytes(this.originalColumnNameStart, this.originalColumnNameLength);
          }
  
          return this.originalColumnName;
      }
  
      public String getOriginalTableName() throws SQLException {
          if ((this.originalTableName == null) && (this.originalTableNameStart != -1) && (this.originalTableNameLength != -1)) {
              this.originalTableName = getStringFromBytes(this.originalTableNameStart, this.originalTableNameLength);
          }
  
          return this.originalTableName;
      }
  
      /**
       * Returns amount of correction that should be applied to the precision
       * value.
       * 
       * Different versions of MySQL report different precision values.
       * 
       * @return the amount to adjust precision value by.
       */
      public int getPrecisionAdjustFactor() {
          return this.precisionAdjustFactor;
      }
  
      public int getSQLType() {
          return this.sqlType;
      }
  
      /**
       * Create a string with the correct charset encoding from the byte-buffer
       * that contains the data for this field
       */
      private String getStringFromBytes(int stringStart, int stringLength) throws SQLException {
          if ((stringStart == -1) || (stringLength == -1)) {
              return null;
          }
  
          String stringVal = null;
  
          if (this.connection != null) {
              if (this.connection.getUseUnicode()) {
                  String javaEncoding = this.connection.getCharacterSetMetadata();
  
                  if (javaEncoding == null) {
                      javaEncoding = this.connection.getEncoding();
                  }
  
                  if (javaEncoding != null) {
                      SingleByteCharsetConverter converter = null;
  
                      if (this.connection != null) {
                          converter = this.connection.getCharsetConverter(javaEncoding);
                      }
  
                      if (converter != null) { // we have a converter
                          stringVal = converter.toString(this.buffer, stringStart, stringLength);
                      } else {
                          // we have no converter, use JVM converter
                          try {
                              stringVal = StringUtils.toString(this.buffer, stringStart, stringLength, javaEncoding);
                          } catch (UnsupportedEncodingException ue) {
                              throw new RuntimeException(Messages.getString("Field.12") + javaEncoding + Messages.getString("Field.13"));
                          }
                      }
                  } else {
                      // we have no encoding, use JVM standard charset
                      stringVal = StringUtils.toAsciiString(this.buffer, stringStart, stringLength);
                  }
              } else {
                  // we are not using unicode, so use JVM standard charset
                  stringVal = StringUtils.toAsciiString(this.buffer, stringStart, stringLength);
              }
          } else {
              // we don't have a connection, so punt
              stringVal = StringUtils.toAsciiString(this.buffer, stringStart, stringLength);
          }
  
          return stringVal;
      }
  
      public String getTable() throws SQLException {
          return getTableName();
      }
  
      public String getTableName() throws SQLException {
          if (this.tableName == null) {
              this.tableName = getStringFromBytes(this.tableNameStart, this.tableNameLength);
          }
  
          return this.tableName;
      }
  
      public String getTableNameNoAliases() throws SQLException {
          if (this.connection.versionMeetsMinimum(4, 1, 0)) {
              return getOriginalTableName();
          }
  
          return getTableName(); // pre-4.1, no aliases returned
      }
  
      public boolean isAutoIncrement() {
          return ((this.colFlag & AUTO_INCREMENT_FLAG) > 0);
      }
  
      public boolean isBinary() {
          return ((this.colFlag & 128) > 0);
      }
  
      public boolean isBlob() {
          return ((this.colFlag & 16) > 0);
      }
  
      /**
       * Is this field owned by a server-created temporary table?
       */
      private boolean isImplicitTemporaryTable() {
          return this.isImplicitTempTable;
      }
  
      public boolean isMultipleKey() {
          return ((this.colFlag & 8) > 0);
      }
  
      boolean isNotNull() {
          return ((this.colFlag & 1) > 0);
      }
  
      boolean isOpaqueBinary() throws SQLException {
  
          //
          // Detect CHAR(n) CHARACTER SET BINARY which is a synonym for fixed-length binary types
          //
  
          if (this.collationIndex == CharsetMapping.MYSQL_COLLATION_INDEX_binary && isBinary()
                  && (this.getMysqlType() == MysqlDefs.FIELD_TYPE_STRING || this.getMysqlType() == MysqlDefs.FIELD_TYPE_VAR_STRING)) {
  
              if (this.originalTableNameLength == 0 && (this.connection != null && !this.connection.versionMeetsMinimum(5, 0, 25))) {
                  return false; // Probably from function
              }
  
              // Okay, queries resolved by temp tables also have this 'signature', check for that
  
              return !isImplicitTemporaryTable();
          }
  
          return (this.connection.versionMeetsMinimum(4, 1, 0) && "binary".equalsIgnoreCase(getEncoding()));
  
      }
  
      public boolean isPrimaryKey() {
  