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package oracle.toplink.essentials.tools.schemaframework;

import java.util.Vector;
import java.io.*;
import java.math.BigDecimal;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.sequencing.Sequence;
import oracle.toplink.essentials.sequencing.DefaultSequence;
import oracle.toplink.essentials.sequencing.TableSequence;

/**
 * 

* Purpose: Allow a generic way of creating sequences on the different platforms, * and allow optional parameters to be specified. *

*/ public class TableSequenceDefinition extends SequenceDefinition { /** * INTERNAL: * Should be a sequence defining table sequence in the db: * either TableSequence * DefaultSequence (only if case platform.getDefaultSequence() is a TableSequence). */ public TableSequenceDefinition(Sequence sequence) { super(sequence); } /** * INTERNAL: * Return the SQL required to insert the sequence row into the sequence table. * Assume that the sequence table exists. */ public Writer buildCreationWriter(AbstractSession session, Writer writer) throws ValidationException { try { writer.write("INSERT INTO "); writer.write(getSequenceTableName()); writer.write("(" + getSequenceNameFieldName()); writer.write(", " + getSequenceCounterFieldName()); writer.write(") values ("); writer.write("'" + getName() + "', " + Integer.toString(sequence.getInitialValue() - 1) + ")"); } catch (IOException ioException) { throw ValidationException.fileError(ioException); } return writer; } /** * INTERNAL: * Return the SQL to delete the row from the sequence table. */ public Writer buildDeletionWriter(AbstractSession session, Writer writer) throws ValidationException { try { writer.write("DELETE FROM "); writer.write(getSequenceTableName()); writer.write(" WHERE " + getSequenceNameFieldName()); writer.write(" = '" + getName() + "'"); } catch (IOException ioException) { throw ValidationException.fileError(ioException); } return writer; } /** * INTERAL: * Execute the SQL required to insert the sequence row into the sequence table. * Assume that the sequence table exists. */ public boolean checkIfExist(AbstractSession session) throws DatabaseException { Vector results = session.executeSelectingCall(new oracle.toplink.essentials.queryframework.SQLCall("SELECT * FROM " + getSequenceTableName() + " WHERE " + getSequenceNameFieldName() + " = '" + getName() + "'")); return !results.isEmpty(); } /** * PUBLIC: */ public String getSequenceTableName() { return getTableSequence().getTableName(); } /** * PUBLIC: */ public String getSequenceCounterFieldName() { return getTableSequence().getCounterFieldName(); } /** * PUBLIC: */ public String getSequenceNameFieldName() { return getTableSequence().getNameFieldName(); } /** * INTERNAL: * Return a TableDefinition specifying sequence table. */ public TableDefinition buildTableDefinition() { TableDefinition definition = new TableDefinition(); definition.setName(getSequenceTableName()); definition.addPrimaryKeyField(getSequenceNameFieldName(), String.class, 50); definition.addField(getSequenceCounterFieldName(), BigDecimal.class); return definition; } protected TableSequence getTableSequence() { if(sequence instanceof TableSequence) { return (TableSequence)sequence; } else { return (TableSequence)((DefaultSequence)sequence).getDefaultSequence(); } } }





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