[feature] Add base class ModifyingExpression to support insert, delete, replace and rename expressions

Author: gabriele-tomassetti

exist-core/src/main/java/org/exist/xquery/update/ModifyingExpression.java

@@ -0,0 +1,55 @@
+/*
+ * eXist-db Open Source Native XML Database
+ * Copyright (C) 2001 The eXist-db Authors
+ *
+ * [email protected]
+ * http://www.exist-db.org
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+package org.exist.xquery.update;
+
+import org.exist.xquery.AbstractExpression;
+import org.exist.xquery.Expression;
+import org.exist.xquery.XQueryContext;
+import org.exist.xquery.value.Type;
+
+/**
+ * @author <a href="[email protected]">Adam Retter</a>
+ * @author <a href="[email protected]">Gabriele Tomassetti</a>
+ */
+public abstract class ModifyingExpression extends AbstractExpression {
+
+    protected final Expression targetExpr;
+
+    public ModifyingExpression(final XQueryContext context, final Expression target) {
+        super(context);
+        this.targetExpr = target;
+    }
+
+    @Override
+    public int returnsType() {
+        // placeholder implementation
+        return Type.EMPTY;
+    }
+
+    public Category getCategory() {
+        return Category.UPDATING;
+    }
+
+    public Expression getTargetExpr() {
+        return targetExpr;
+    }
+}