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'jdbacl' stands for 'Java DataBase ACcess Layer' and provides utilities for accessing JDBC databases from Java programs, retrieving meta information in an object model and querying database data. 'rapiddweller jdbacl' is forked from Databene jdbacl by Volker Bergmann.

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/*
 * (c) Copyright 2010-2011 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.rapiddweller.jdbacl.sql;

import com.rapiddweller.common.ArrayBuilder;
import com.rapiddweller.common.exception.ExceptionFactory;
import com.rapiddweller.common.StringUtil;
import com.rapiddweller.jdbacl.DatabaseDialect;
import com.rapiddweller.jdbacl.model.DBColumn;
import com.rapiddweller.jdbacl.model.DBDataType;
import com.rapiddweller.jdbacl.model.DBPrimaryKeyConstraint;
import com.rapiddweller.jdbacl.model.DBTable;
import com.rapiddweller.jdbacl.sql.parser.SQLLexer;
import com.rapiddweller.jdbacl.sql.parser.SQLParser;
import com.rapiddweller.jdbacl.sql.parser.TextHolder;
import com.rapiddweller.common.Expression;
import com.rapiddweller.script.expression.ConcatExpression;
import com.rapiddweller.script.expression.ConditionalAndExpression;
import com.rapiddweller.script.expression.ConditionalOrExpression;
import com.rapiddweller.script.expression.DivisionExpression;
import com.rapiddweller.script.expression.EqualsExpression;
import com.rapiddweller.script.expression.ExclusiveOrExpression;
import com.rapiddweller.script.expression.ExpressionUtil;
import com.rapiddweller.script.expression.GreaterExpression;
import com.rapiddweller.script.expression.GreaterOrEqualsExpression;
import com.rapiddweller.script.expression.LessExpression;
import com.rapiddweller.script.expression.LessOrEqualsExpression;
import com.rapiddweller.script.expression.LogicalComplementExpression;
import com.rapiddweller.script.expression.ModuloExpression;
import com.rapiddweller.script.expression.MultiplicationExpression;
import com.rapiddweller.script.expression.NotEqualsExpression;
import com.rapiddweller.script.expression.NullExpression;
import com.rapiddweller.script.expression.SubtractionExpression;
import com.rapiddweller.script.expression.SumExpression;
import com.rapiddweller.script.expression.UnaryMinusExpression;
import com.rapiddweller.script.expression.ValueCollectionContainsExpression;
import org.antlr.runtime.CharStream;
import org.antlr.runtime.CommonToken;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.ParserRuleReturnScope;
import org.antlr.runtime.RecognitionException;
import org.antlr.runtime.tree.CommonTree;

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Provides SQL parsing functionality.


 * Created: 05.08.2010 10:19:38
 * @author Volker Bergmann
 * @since 0.1
 */
public class SQLParserUtil {

  public static final String ERROR_PARSING_SQL = "Error parsing SQL";

  private SQLParserUtil() {
    // private constructor to prevent instantiation of this utility class
  }

  public static Object parse(CharStream in, DatabaseDialect dialect) {
    String text = null;
    if (in instanceof TextHolder) {
      text = ((TextHolder) in).getText();
    }
    try {
      SQLParser parser = parser(in);
      SQLParser.commands_return r = parser.commands();
      checkForSyntaxErrors(text, "weightedLiteralList", parser, r);
      return convertNode((CommonTree) r.getTree(), dialect);
    } catch (RuntimeException e) {
      if (e.getCause() instanceof RecognitionException) {
        RecognitionException cause = (RecognitionException) e.getCause();
        throw ExceptionFactory.getInstance().syntaxErrorForText(ERROR_PARSING_SQL, cause, text,
            cause.line, cause.charPositionInLine);
      } else {
        throw e;
      }
    } catch (RecognitionException e) {
      throw ExceptionFactory.getInstance().syntaxErrorForText(ERROR_PARSING_SQL, e, text,
          e.line, e.charPositionInLine);
    }
  }

  public static Expression parseExpression(CharStream in) {
    String text = null;
    if (in instanceof TextHolder) {
      text = ((TextHolder) in).getText();
    }
    try {
      SQLParser parser = parser(in);
      SQLParser.expression_return r = parser.expression();
      checkForSyntaxErrors(text, "expression", parser, r);
      return convertExpressionNode((CommonTree) r.getTree());
    } catch (RuntimeException e) {
      if (e.getCause() instanceof RecognitionException) {
        RecognitionException cause = (RecognitionException) e.getCause();
        throw ExceptionFactory.getInstance().syntaxErrorForText(ERROR_PARSING_SQL, cause, text,
            cause.line, cause.charPositionInLine);
      } else {
        throw e;
      }
    } catch (RecognitionException e) {
      throw ExceptionFactory.getInstance().syntaxErrorForText(ERROR_PARSING_SQL, e, text,
          e.line, e.charPositionInLine);
    }
  }

  private static Object convertNode(CommonTree node, DatabaseDialect dialect) {
    switch (node.getType()) {
      case SQLLexer.CREATE_TABLE:
        return convertCreateTable(node, dialect);
      case SQLLexer.DROP_TABLE:
        return convertDropTable(node);
      case SQLLexer.ALTER_TABLE:
        return convertAlterTable(node);
      case SQLLexer.CREATE_SEQUENCE:
        return convertCreateSequence(node);
      case SQLLexer.DROP_SEQUENCE:
        return convertDropSequence(node);
      case SQLLexer.CREATE_INDEX:
        return convertCreateIndex(node);
      case SQLLexer.COMMENT_TABLE:
        return convertTableComment(node);
      case SQLLexer.COMMENT_COLUMN:
        return convertColumnComment(node);
      default:
        if (node.isNil()) {
          List nodes = convertNodes(getChildNodes(node), dialect);
          return nodes.toArray();
        }
        throw ExceptionFactory.getInstance().syntaxErrorForText(node.getText(), "Unknown token type");
    }
  }

  @SuppressWarnings("rawtypes")
  private static Expression convertExpressionNode(CommonTree node) {
    switch (node.getType()) {
      case SQLLexer.OR:
        return convertOr(node);
      case SQLLexer.AND:
        return convertAnd(node);
      case SQLLexer.XOR:
        return convertXor(node);
      case SQLLexer.EQ:
        return convertEq(node);
      case SQLLexer.BANGEQ:
        return convertBangEq(node);
      case SQLLexer.LTGT:
        return convertBangEq(node); // <>
      case SQLLexer.GT:
        return convertGt(node);
      case SQLLexer.GE:
        return convertGe(node);
      case SQLLexer.LT:
        return convertLt(node);
      case SQLLexer.LE:
        return convertLe(node);
      case SQLLexer.IS:
        return convertIs(node);
      case SQLLexer.NOT:
        return convertNot(node);
      case SQLLexer.NULL:
        return convertNull(node);
      case SQLLexer.LIKE:
        return convertLike(node);
      case SQLLexer.IN:
        return convertIn(node);
      case SQLLexer.BETWEEN:
        return convertBetween(node);
      case SQLLexer.PLUS:
        return convertPlus(node);
      case SQLLexer.SUB:
        return convertSub(node);
      case SQLLexer.STAR:
        return convertStar(node);
      case SQLLexer.SLASH:
        return convertSlash(node);
      case SQLLexer.PERCENT:
        return convertPercent(node);
      case SQLLexer.BARBAR:
        return convertBarBar(node);
      case SQLLexer.INVOCATION:
        return convertInvocation(node);
      case SQLLexer.QUOTED_NAME:
        return convertQuotedName(node);
      case SQLLexer.IDENTIFIER:
        return convertIdentifier(node);
      case SQLLexer.STRING:
        return convertStringToExpression(node);
      case SQLLexer.INT:
        return convertInt(node);
      default:
        throw ExceptionFactory.getInstance().syntaxErrorForText(node.getText(),
            "Unknown token type (" + node.getType() + ")");
    }
  }

  @SuppressWarnings("unchecked")
  private static Expression convertOr(CommonTree node) {
    ConditionalOrExpression result = new ConditionalOrExpression("OR");
    for (CommonTree childNode : getChildNodes(node)) {
      result.addTerm(convertExpressionNode(childNode));
    }
    return result;
  }

  @SuppressWarnings("unchecked")
  private static Expression convertAnd(CommonTree node) {
    ConditionalAndExpression result = new ConditionalAndExpression("AND");
    for (CommonTree childNode : getChildNodes(node)) {
      result.addTerm(convertExpressionNode(childNode));
    }
    return result;
  }

  private static Expression convertXor(CommonTree node) {
    return new ExclusiveOrExpression(
        convertExpressionNode(childAt(0, node)),
        convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertEq(CommonTree node) {
    return new EqualsExpression("=",
        convertExpressionNode(childAt(0, node)), convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertBangEq(CommonTree node) {
    return new NotEqualsExpression(convertExpressionNode(childAt(0, node)), convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertGt(CommonTree node) {
    return new GreaterExpression(convertExpressionNode(childAt(0, node)), convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertGe(CommonTree node) {
    return new GreaterOrEqualsExpression(convertExpressionNode(childAt(0, node)), convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertLt(CommonTree node) {
    return new LessExpression(convertExpressionNode(childAt(0, node)), convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertLe(CommonTree node) {
    return new LessOrEqualsExpression(convertExpressionNode(childAt(0, node)), convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertIs(CommonTree node) {
    if (node.getChildCount() > 1) {
      return new NotEqualsExpression("IS NOT", convertExpressionNode(childAt(0, node)), new NullExpression());
    } else {
      return new EqualsExpression("IS", convertExpressionNode(childAt(0, node)), new NullExpression());
    }
  }

  private static Expression convertNot(CommonTree node) {
    return new LogicalComplementExpression("NOT ", convertExpressionNode(childAt(0, node)));
  }

  private static Expression convertNull(CommonTree node) {
    return new NullExpression();
  }

  private static Expression convertLike(CommonTree node) {
    Expression valueEx = convertExpressionNode(childAt(0, node));
    CommonTree child1 = childAt(1, node);
    boolean not = (child1.getType() == SQLLexer.NOT);
    int collectionIndex = (not ? 2 : 1);
    Expression refEx = convertExpressionNode(childAt(collectionIndex, node));
    Expression result = new LikeExpression(valueEx, refEx);
    if (not) {
      result = new LogicalComplementExpression(result);
    }
    return result;
  }

  private static Expression convertIn(CommonTree node) {
    Expression valueEx = convertExpressionNode(childAt(0, node));
    CommonTree child1 = childAt(1, node);
    boolean not = (child1.getType() == SQLLexer.NOT);
    int collectionIndex = (not ? 2 : 1);
    Expression> collEx = convertValueList(childAt(collectionIndex, node));
    Expression result = new ValueCollectionContainsExpression("IN", valueEx, collEx);
    if (not) {
      result = new LogicalComplementExpression(result);
    }
    return result;
  }

  private static Expression> convertValueList(CommonTree node) {
    List> result = new ArrayList<>();
    for (CommonTree child : getChildNodes(node)) {
      result.add(convertExpressionNode(child));
    }
    return ExpressionUtil.constant(result);
  }

  private static Expression convertBetween(CommonTree node) {
    return new BetweenExpression(convertExpressionNode(childAt(0, node)),
        convertExpressionNode(childAt(1, node)),
        convertExpressionNode(childAt(2, node)));
  }

  @SuppressWarnings("unchecked")
  private static Expression convertPlus(CommonTree node) {
    SumExpression result = new SumExpression();
    for (CommonTree child : getChildNodes(node)) {
      result.addTerm(convertExpressionNode(child));
    }
    return result;
  }

  @SuppressWarnings("unchecked")
  private static Expression convertSub(CommonTree node) {
    if (node.getChildCount() == 1) {
      return new UnaryMinusExpression<>(convertExpressionNode(childAt(0, node)));
    } else {
      SubtractionExpression result = new SubtractionExpression();
      for (CommonTree child : getChildNodes(node)) {
        result.addTerm(convertExpressionNode(child));
      }
      return result;
    }
  }

  @SuppressWarnings("unchecked")
  private static Expression convertStar(CommonTree node) {
    MultiplicationExpression result = new MultiplicationExpression();
    for (CommonTree child : getChildNodes(node)) {
      result.addTerm(convertExpressionNode(child));
    }
    return result;
  }

  @SuppressWarnings("unchecked")
  private static Expression convertSlash(CommonTree node) {
    DivisionExpression result = new DivisionExpression();
    for (CommonTree child : getChildNodes(node)) {
      result.addTerm(convertExpressionNode(child));
    }
    return result;
  }

  private static Expression convertPercent(CommonTree node) {
    return new ModuloExpression(
        convertExpressionNode(childAt(0, node)),
        convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertBarBar(CommonTree node) {
    return new ConcatExpression("||",
        convertExpressionNode(childAt(0, node)),
        convertExpressionNode(childAt(1, node)));
  }

  private static Expression convertInvocation(CommonTree node) {
    String functionName = convertIdentifier(childAt(0, node)).evaluate(null);
    Expression[] arguments = convertArguments(childAt(1, node));
    return new FunctionInvocation(functionName, arguments);
  }

  @SuppressWarnings("rawtypes")
  private static Expression[] convertArguments(CommonTree node) {
    ArrayBuilder result = new ArrayBuilder<>(Expression.class);
    for (CommonTree child : getChildNodes(node)) {
      result.add(convertExpressionNode(child));
    }
    return result.toArray();
  }

  private static Expression convertIdentifier(CommonTree node) {
    return new ColumnExpression(node.getText(), false);
  }

  private static Expression convertQuotedName(CommonTree node) {
    String quotedColName = node.getText().trim();
    String colName = quotedColName.substring(1, quotedColName.length() - 1);
    return new ColumnExpression(colName, true);
  }

  private static Expression convertStringToExpression(CommonTree node) {
    return ExpressionUtil.constant(node.getText());
  }

  private static Expression convertInt(CommonTree node) {
    return ExpressionUtil.constant(new BigInteger(node.getText()));
  }

  private static Object convertTableComment(CommonTree node) {
    // TODO Process 'comment on table'
    return null;
  }

  private static Object convertColumnComment(CommonTree node) {
    // TODO Process 'comment on column'
    return null;
  }

  private static Object convertAlterTable(CommonTree node) {
    // TODO Process 'alter table'
    return null;
  }

  private static Object convertDropTable(CommonTree node) {
    // TODO Process 'drop table'
    return null;
  }

  private static Object convertCreateSequence(CommonTree node) {
    // TODO Process 'create sequence'
    return null;
  }

  private static Object convertCreateIndex(CommonTree node) {
    // TODO Process 'create index'
    return null;
  }

  private static Object convertDropSequence(CommonTree node) {
    // TODO Process 'drop sequence'
    return null;
  }

  private static List convertNodes(List nodes, DatabaseDialect dialect) {
    List result = new ArrayList<>();
    for (CommonTree node : nodes) {
      result.add(convertNode(node, dialect));
    }
    return result;
  }

  private static DBTable convertCreateTable(CommonTree node, DatabaseDialect dialect) {
    String tableName = convertString(childAt(0, node));
    DBTable table = new DBTable(tableName);
    convertTableDetails(childAt(1, node), table, dialect);
    // TODO parse ora_configs
    return table;
  }

  private static void convertTableDetails(CommonTree node, DBTable table, DatabaseDialect dialect) {
    for (CommonTree subNode : getChildNodes(node)) {
      convertTableDetail(subNode, table, dialect);
    }
  }

  private static void convertTableDetail(CommonTree node, DBTable table, DatabaseDialect dialect) {
    switch (node.getType()) {
      case SQLLexer.COLUMN_SPEC:
        convertColumnSpec(node, table);
        break;
      case SQLLexer.PRIMARY:
        convertInlinePK(node, table, dialect);
        break;
      default:
        throw ExceptionFactory.getInstance().syntaxErrorForText("Unknown table detail token type", String.valueOf(node.getText()),
            node.getLine(), node.getCharPositionInLine());
    }
  }

  private static void convertInlinePK(CommonTree node, DBTable table, DatabaseDialect dialect) {
    String constraintName = convertString(childAt(0, node));
    String[] pkColumnNames = convertNameList(childAt(1, node));
    DBPrimaryKeyConstraint pk = new DBPrimaryKeyConstraint(
        table, constraintName, dialect.isDeterministicPKName(constraintName), pkColumnNames);
    table.setPrimaryKey(pk);
  }

  private static String[] convertNameList(CommonTree node) {
    String[] result = new String[node.getChildCount()];
    for (int i = 0; i < result.length; i++) {
      result[i] = convertString(childAt(i, node));
    }
    return result;
  }

  private static void convertColumnSpec(CommonTree node, DBTable table) {
    String columnName = convertString(childAt(0, node));
    String columnTypeName;
    Integer size = null;
    Integer fractionDigits = null;
    int detailOffset = 2;
    columnTypeName = convertString(childAt(1, node));
    if (node.getChildCount() > 2 && childAt(2, node).getType() == SQLLexer.SIZE) {
      detailOffset++;
      CommonTree sizeNode = childAt(2, node);
      size = convertInteger(childAt(0, sizeNode));
      if (sizeNode.getChildCount() > 1) {
        CommonTree subNode2 = childAt(1, sizeNode);
        if (subNode2.getType() == SQLLexer.INT) {
          fractionDigits = convertInteger(subNode2);
        } else {
          // TODO support (n BYTE) / (n CHAR)
        }
      }
    }
    DBColumn column = new DBColumn(columnName, table, DBDataType.getInstance(columnTypeName), size, fractionDigits);
    table.addColumn(column);
    for (int i = detailOffset; i < node.getChildCount(); i++) {
      convertColumnDetail(childAt(i, node), column);
    }
  }

  private static Integer convertInteger(CommonTree node) {
    return Integer.parseInt(node.getText());
  }

  private static void convertColumnDetail(CommonTree node, DBColumn column) {
    switch (node.getType()) {
      case SQLLexer.NOT:
        column.setNullable(false);
        break;
      case SQLLexer.DEFAULT:
        column.setNullable(false);
        break;
      default:
        throw ExceptionFactory.getInstance().syntaxErrorForText("Unknown column detail token type", String.valueOf(node.getText()),
            node.getLine(),
            node.getCharPositionInLine());
    }
  }

  private static String convertString(CommonTree node) {
    return node.getText();
  }

  private static SQLParser parser(CharStream in) {
    SQLLexer lex = new SQLLexer(in);
    CommonTokenStream tokens = new CommonTokenStream(lex);
    return new SQLParser(tokens);
  }

  @SuppressWarnings("unchecked")
  private static List getChildNodes(CommonTree node) {
    return node.getChildren();
  }

  private static CommonTree childAt(int index, CommonTree node) {
    return (CommonTree) node.getChild(index);
  }

  private static void checkForSyntaxErrors(String text, String type, SQLParser parser, ParserRuleReturnScope r) {
    if (parser.getNumberOfSyntaxErrors() > 0) {
      throw ExceptionFactory.getInstance().syntaxErrorForText(text, "Illegal " + type);
    }
    CommonToken stop = (CommonToken) r.stop;
    if (text != null && stop.getStopIndex() < StringUtil.trimRight(text).length() - 1) {
      if (stop.getStopIndex() == 0) {
        throw ExceptionFactory.getInstance().syntaxErrorForText(text, "Syntax error after " + stop.getText());
      } else {
        throw ExceptionFactory.getInstance().syntaxErrorForText(text, "Syntax error at the beginning ");
      }
    }
  }

}
    

    

    

            

    

            



    
    






    
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