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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Michael Powers
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.access;
import java.lang.reflect.Constructor;
import net.wotonomy.control.EOFetchSpecification;
import net.wotonomy.control.EOQualifier;
import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSDictionary;
/**
*
* @author ezamudio@nasoft.com
* @author $Author: cgruber $
* @version $Revision: 894 $
*/
public class EOSQLExpressionFactory {
protected EOAdaptor _adaptor;
protected Class _expressionClass;
private Constructor _instantiator;
public EOSQLExpressionFactory(EOAdaptor adaptor) {
super();
_adaptor = adaptor;
_expressionClass = _adaptor.expressionClass();
if (_expressionClass == null)
throw new IllegalStateException("EOAdaptor " + _adaptor.name() + " returned null for expressionClass()");
}
public EOAdaptor adaptor() {
return _adaptor;
}
/**
* Creates an instance of the adaptor's expression class,
* with entity assigned to it.
* @param entity The entity with which to initialize the expression.
* @return An EOSQLExpression.
*/
public EOSQLExpression createExpression(EOEntity entity) {
EOSQLExpression expr = null;
if (_instantiator == null) {
try {
_instantiator = _expressionClass.getConstructor(new Class[]{ EOEntity.class });
} catch (Exception ex) {
throw new IllegalArgumentException("The expression class " + _expressionClass.getName() + " has no constructor with an entity parameter.");
}
}
try {
expr = (EOSQLExpression)_instantiator.newInstance(new Object[]{ entity });
} catch (Exception ex) {
throw new IllegalArgumentException("Cannot create new expression of class " + _expressionClass.getName());
}
return expr;
}
public EOSQLExpression expressionForEntity(EOEntity entity) {
return createExpression(entity);
}
public EOSQLExpression deleteStatementWithQualifier(EOQualifier qualifier, EOEntity entity) {
EOSQLExpression expr = createExpression(entity);
expr.prepareDeleteExpressionForQualifier(qualifier);
return expr;
}
public EOSQLExpression insertStatementForRow(NSDictionary row, EOEntity entity) {
EOSQLExpression expr = createExpression(entity);
expr.prepareInsertExpressionWithRow(row);
return expr;
}
public EOSQLExpression selectStatementForAttributes(NSArray atts, boolean lock, EOFetchSpecification fspec, EOEntity entity) {
EOSQLExpression expr = createExpression(entity);
expr.prepareSelectExpressionWithAttributes(atts, lock, fspec);
return expr;
}
public EOSQLExpression updateStatementForRow(NSDictionary row, EOQualifier qualifier, EOEntity entity) {
EOSQLExpression expr = createExpression(entity);
expr.prepareUpdateExpressionWithRow(row, qualifier);
return expr;
}
public EOSQLExpression expressionForString(String sql) {
EOSQLExpression expr = null;
try {
expr = (EOSQLExpression)_expressionClass.newInstance();
} catch (Exception e) {
return null;
}
expr.setStatement(sql);
return expr;
}
public Class expressionClass() {
return _expressionClass;
}
}
/*
* $Log$
* Revision 1.2 2006/02/16 16:47:14 cgruber
* Move some classes in to "internal" packages and re-work imports, etc.
*
* Also use UnsupportedOperationExceptions where appropriate, instead of WotonomyExceptions.
*
* Revision 1.1 2006/02/16 13:19:57 cgruber
* Check in all sources in eclipse-friendly maven-enabled packages.
*
* Revision 1.1 2003/08/13 01:04:32 chochos
* the SQL generation classes. EOSQLExpression still needs a lot of work, but the factory is pretty much done.
*
*/
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