Examples of org.exolab.castor.jdo.engine.JDOClassDescriptor

org.exolab.castor.jdo.engine.JDOClassDescriptor
JDO class descriptors. Extends {@link ClassDescriptor} to include thetable name and other SQL-related information. All fields are of type {@link JDOFieldDescriptor}, identity field is not included in the returned field list, and contained fields are flattened out for efficiency (thus all fields are directly accessible). @author Assaf Arkin @version $Revision: 1.3 $ $Date: 2004/06/16 09:46:22 $

   * @param tableIndex Field index in the path info
   */
  private Object[] getFieldAndClassDesc(String fieldName, JDOClassDescriptor clsDesc, QueryExpression expr,
                                        Vector path, int tableIndex) {
    JDOFieldDescriptor field = null;
    JDOClassDescriptor cd = clsDesc;
    JDOFieldDescriptor tempField = null;
    JDOClassDescriptor tempCd = clsDesc;
    Object[] retVal;


    while (tempCd != null) {
        tempField = tempCd.getField(fieldName);
        if (tempField != null) {
            field = tempField;
            cd = tempCd;
        }
        tempCd = (JDOClassDescriptor) tempCd.getExtends();
    }
 
    if (field == null) {
        return null;
    }

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            projectionName.append(curName);
            projectionInfo.addElement(curName);
          }


          //use the ClassDescriptor to check that the rest of the path is valid.
          JDOClassDescriptor curClassDesc = _clsDesc;
          JDOFieldDescriptor curField = null;
          int count = 0;
          String curToken;
          while ( e.hasMoreElements() ) {
            // there may be nested attribute name

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    if ( path == null )
      throw new IllegalStateException( "path = null !" );


    // the class for the join is even this class
    // or one of the base classes
    JDOClassDescriptor sourceClass = _clsDesc;


    for ( int i = 1; i < path.size() - 1; i++ ) {
        JDOFieldDescriptor fieldDesc = null;


        // Find the sourceclass and the fielsddescriptor
        // in the class hierachie
        Object[] fieldAndClass = getFieldAndClassDesc((String) path.elementAt(i), sourceClass,
                                                      _queryExpr, path, i - 1);
        if (fieldAndClass == null) {
            throw new IllegalStateException( "Field not found:" + path.elementAt(i));
        }
        fieldDesc = (JDOFieldDescriptor) fieldAndClass[0];
        sourceClass = (JDOClassDescriptor) fieldAndClass[1];


        JDOClassDescriptor clsDesc = (JDOClassDescriptor) fieldDesc.getClassDescriptor();
        if ( clsDesc != null /*&& clsDesc != sourceClass*/ ) {
            //we must add this table as a join
            if ( fieldDesc.getManyKey() == null ) {
                //a many -> one relationship
                JDOFieldDescriptor foreignKey = (JDOFieldDescriptor) clsDesc.getIdentity();
                String sourceTableAlias = sourceClass.getTableName();
                if ( i > 1 )
                    sourceTableAlias = buildTableAlias( sourceTableAlias, path, i - 1 );


                _queryExpr.addInnerJoin( sourceClass.getTableName(),
                                         fieldDesc.getSQLName(),
                                         sourceTableAlias,
                                         clsDesc.getTableName(),
                                         foreignKey.getSQLName(),
                                         buildTableAlias( clsDesc.getTableName(), path, i ) );
            } else if ( fieldDesc.getManyTable() == null ) {
                //a one -> many relationship
                JDOFieldDescriptor identity = (JDOFieldDescriptor) sourceClass.getIdentity();
                String sourceTableAlias = sourceClass.getTableName();
                if ( i > 1 )
                    sourceTableAlias = buildTableAlias( sourceTableAlias, path, i - 1 );


                _queryExpr.addInnerJoin( sourceClass.getTableName(),
                                         identity.getSQLName(),
                                         sourceTableAlias,
                                         clsDesc.getTableName(),
                                         fieldDesc.getManyKey(),
                                         buildTableAlias( clsDesc.getTableName(), path, i ) );
            } else {
                //a many -> many relationship
                JDOFieldDescriptor identity = (JDOFieldDescriptor) sourceClass.getIdentity();
                JDOFieldDescriptor foreignKey = (JDOFieldDescriptor) clsDesc.getIdentity();
                String manyTableAlias = fieldDesc.getManyTable();
                String sourceTableAlias = sourceClass.getTableName();
                if ( i > 1 ) {
                    manyTableAlias = buildTableAlias( manyTableAlias, path, i - 1 );
                    sourceTableAlias = buildTableAlias( sourceTableAlias, path, i - 1 );
      }


                _queryExpr.addInnerJoin( sourceClass.getTableName(),
                                         identity.getSQLName(),
                                         sourceTableAlias,
                                         fieldDesc.getManyTable(),
                                         fieldDesc.getManyKey(),
                                         manyTableAlias);


                _queryExpr.addInnerJoin( fieldDesc.getManyTable(),
                                         fieldDesc.getSQLName(),
                                         manyTableAlias,
                                         clsDesc.getTableName(),
                                         foreignKey.getSQLName(),
                                         buildTableAlias( clsDesc.getTableName(), path, i ) );
            }
            sourceClass = clsDesc;
        }
    }
  }

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            JDOFieldDescriptor field = (JDOFieldDescriptor) _fieldInfo.get(exprTree);
            if ( field == null ) {
                throw new IllegalStateException( "fieldInfo for " + exprTree.toStringEx() + " not found" );
            }


            JDOClassDescriptor clsDesc = (JDOClassDescriptor) field.getContainingClassDescriptor();
            if ( clsDesc == null ) {
                throw new IllegalStateException( "ContainingClass of "+ field.toString()+" is null !" );
            }


            String clsTableAlias;
            if ( tokenType == DOT && path != null && path.size() > 2 ) {
                clsTableAlias = buildTableAlias( clsDesc.getTableName(), path, path.size() - 2 );
                JDOClassDescriptor srcDesc = _clsDesc;
                for ( int i = 1; i < path.size(); i++ ) {
                    Object[] fieldAndClass = getFieldAndClassDesc((String) path.elementAt(i), srcDesc,
                                                                  _queryExpr, path, i - 1);
                    if (fieldAndClass == null) {
                        throw new IllegalStateException( "Field not found: " + path.elementAt(i) + " class " + srcDesc.getJavaClass());
                    }
                    JDOFieldDescriptor fieldDesc = (JDOFieldDescriptor) fieldAndClass[0];
                    srcDesc = (JDOClassDescriptor) fieldDesc.getClassDescriptor();
                }
            } else {

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   * @param pathIndex Field index in the path info
   */
  private Object[] getFieldAndClassDesc(String fieldName, JDOClassDescriptor clsDesc, QueryExpression expr,
                                        Vector path, int tableIndex) {
    JDOFieldDescriptor field = null;
    JDOClassDescriptor cd = clsDesc;
    JDOFieldDescriptor tempField = null;
    JDOClassDescriptor tempCd = clsDesc;
    Object[] retVal;


    while (tempCd != null) {
        tempField = tempCd.getField(fieldName);
        if (tempField != null) {
            field = tempField;
            cd = tempCd;
        }
        tempCd = (JDOClassDescriptor) tempCd.getExtends();
    }
 
    if (field == null) {
        return null;
    }

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            projectionName.append(curName);
            projectionInfo.addElement(curName);
          }


          //use the ClassDescriptor to check that the rest of the path is valid.
          JDOClassDescriptor curClassDesc = _clsDesc;
          JDOFieldDescriptor curField = null;
          int count = 0;
          String curToken;
          while ( e.hasMoreElements() ) {
            // there may be nested attribute name

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    if ( path == null )
      throw new IllegalStateException( "path = null !" );


    // the class for the join is even this class
    // or one of the base classes
    JDOClassDescriptor sourceClass = _clsDesc;


    for ( int i = 1; i < path.size() - 1; i++ ) {
        JDOFieldDescriptor fieldDesc = null;


        // Find the sourceclass and the fielsddescriptor
        // in the class hierachie
        Object[] fieldAndClass = getFieldAndClassDesc((String) path.elementAt(i), sourceClass,
                                                      _queryExpr, path, i - 1);
        if (fieldAndClass == null) {
            throw new IllegalStateException( "Field not found:" + path.elementAt(i));
        }
        fieldDesc = (JDOFieldDescriptor) fieldAndClass[0];
        sourceClass = (JDOClassDescriptor) fieldAndClass[1];


        JDOClassDescriptor clsDesc = (JDOClassDescriptor) fieldDesc.getClassDescriptor();
        if ( clsDesc != null /*&& clsDesc != sourceClass*/ ) {
            //we must add this table as a join
            if ( fieldDesc.getManyKey() == null ) {
                //a many -> one relationship
                JDOFieldDescriptor foreignKey = (JDOFieldDescriptor) clsDesc.getIdentity();
                String sourceTableAlias = sourceClass.getTableName();
                if ( i > 1 )
                    sourceTableAlias = buildTableAlias( sourceTableAlias, path, i - 1 );


                _queryExpr.addInnerJoin( sourceClass.getTableName(),
                                         fieldDesc.getSQLName(),
                                         sourceTableAlias,
                                         clsDesc.getTableName(),
                                         foreignKey.getSQLName(),
                                         buildTableAlias( clsDesc.getTableName(), path, i ) );
            } else if ( fieldDesc.getManyTable() == null ) {
                //a one -> many relationship
                JDOFieldDescriptor identity = (JDOFieldDescriptor) sourceClass.getIdentity();
                String sourceTableAlias = sourceClass.getTableName();
                if ( i > 1 )
                    sourceTableAlias = buildTableAlias( sourceTableAlias, path, i - 1 );


                _queryExpr.addInnerJoin( sourceClass.getTableName(),
                                         identity.getSQLName(),
                                         sourceTableAlias,
                                         clsDesc.getTableName(),
                                         fieldDesc.getManyKey(),
                                         buildTableAlias( clsDesc.getTableName(), path, i ) );
            } else {
                //a many -> many relationship
                JDOFieldDescriptor identity = (JDOFieldDescriptor) sourceClass.getIdentity();
                JDOFieldDescriptor foreignKey = (JDOFieldDescriptor) clsDesc.getIdentity();
                String manyTableAlias = fieldDesc.getManyTable();
                String sourceTableAlias = sourceClass.getTableName();
                if ( i > 1 ) {
                    manyTableAlias = buildTableAlias( manyTableAlias, path, i - 1 );
                    sourceTableAlias = buildTableAlias( sourceTableAlias, path, i - 1 );
      }


                _queryExpr.addInnerJoin( sourceClass.getTableName(),
                                         identity.getSQLName(),
                                         sourceTableAlias,
                                         fieldDesc.getManyTable(),
                                         fieldDesc.getManyKey(),
                                         manyTableAlias);


                _queryExpr.addInnerJoin( fieldDesc.getManyTable(),
                                         fieldDesc.getSQLName(),
                                         manyTableAlias,
                                         clsDesc.getTableName(),
                                         foreignKey.getSQLName(),
                                         buildTableAlias( clsDesc.getTableName(), path, i ) );
            }
            sourceClass = clsDesc;
        }
    }
  }

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org.exolab.castor.mapping.MappingException

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