Created a rule like SetNext but that sets the child object into a field of

the parent rather than calling a method with the child as an argument. git-svn-id: https://samskivert.googlecode.com/svn/trunk@480 6335cc39-0255-0410-8fd6-9bcaacd3b74c
2001-11-29 18:11:42 +00:00
parent 600ee8663b
commit 129521a913
1 changed files with 65 additions and 0 deletions
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+//
+// $Id: SetNextFieldRule.java,v 1.1 2001/11/29 18:11:42 mdb Exp $
+//
+// samskivert library - useful routines for java programs
+// Copyright (C) 2001 Walter Korman
+// 
+// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.xml;
+
+import java.lang.reflect.Field;
+
+import org.xml.sax.Attributes;
+import org.apache.commons.digester.Digester;
+import org.apache.commons.digester.Rule;
+
+/**
+ * Like the <code>SetNextRule</code> except that the object on the top of
+ * the stack is placed into a field of the penultimate object.
+ */
+public class SetNextFieldRule extends Rule
+{
+    /**
+     * Constructs a set field rule for the specified field.
+     */
+    public SetNextFieldRule (Digester digester, String fieldName)
+    {
+        super(digester);
+
+        // keep this for later
+        _fieldName = fieldName;
+    }
+
+    public void end ()
+        throws Exception
+    {
+	// identify the objects to be used
+	Object child = digester.peek(0);
+	Object parent = digester.peek(1);
+        Class pclass = parent.getClass();
+
+	if (digester.getDebug() >= 1) {
+	    digester.log("Set " + pclass.getName() + "." + _fieldName +
+                         " = " + child);
+        }
+
+        // stuff the child object into the field of the parent
+        Field field = pclass.getField(_fieldName);
+        field.set(parent, child);
+    }
+
+    protected String _fieldName;
+}