Initial import from SVN

1 files changed, 131 insertions, 0 deletions

diff --git a/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/access/EOSQLExpressionFactory.java b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/access/EOSQLExpressionFactory.java
new file mode 100644
index 0000000..6bdbffe
--- /dev/null
+++ b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/access/EOSQLExpressionFactory.java
@@ -0,0 +1,131 @@
+/*
+ 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.
+ *
+ */
\ No newline at end of file