Revision: 364
Author: tfenne
Date: 2006-08-09 18:44:05 -0700 (Wed, 09 Aug 2006)
ViewCVS: http://svn.sourceforge.net/stripes/?rev=364&view=rev
Log Message:
-----------
First cut at a solution for STS-189: an alternative bean-first population
strategy. I'm still not sure what should be looked at next when the bean
itself is null or doesn't have a matching property, but I've gone with the page
for now.
Added Paths:
-----------
trunk/stripes/src/net/sourceforge/stripes/tag/BeanFirstPopulationStrategy.java
Added:
trunk/stripes/src/net/sourceforge/stripes/tag/BeanFirstPopulationStrategy.java
===================================================================
---
trunk/stripes/src/net/sourceforge/stripes/tag/BeanFirstPopulationStrategy.java
(rev 0)
+++
trunk/stripes/src/net/sourceforge/stripes/tag/BeanFirstPopulationStrategy.java
2006-08-10 01:44:05 UTC (rev 364)
@@ -0,0 +1,82 @@
+/* Copyright 2005-2006 Tim Fennell
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.sourceforge.stripes.tag;
+
+import net.sourceforge.stripes.exception.StripesJspException;
+import net.sourceforge.stripes.action.ActionBean;
+import net.sourceforge.stripes.util.bean.BeanUtil;
+import net.sourceforge.stripes.util.bean.ExpressionException;
+import net.sourceforge.stripes.util.Log;
+
+/**
+ * <p>An alternative tag population strategy that will normally prefer the
value from the ActionBean
+ * over values from the request - even when the ActionBean returns null! Only
if the ActionBean
+ * is not present, or does not define an attribute with the name supplied to
the tag will other
+ * population sources be examined. When that happens, the strategy will check
the value
+ * specified on the page next, and finally the value(s) in the request.</p>
+ *
+ * <p>If the field represented by the tag is determined to be in error (i.e.
the ActionBean is
+ * present and has validation errors for the matching field) then the
repopulation behaviour
+ * will revert to the default behaviour of preferring the request
parameters.</p>
+ *
+ * @author Tim Fennell
+ * @since Stripes 1.4
+ */
+public class BeanFirstPopulationStrategy extends DefaultPopulationStrategy {
+ private static Log log =
Log.getInstance(BeanFirstPopulationStrategy.class);
+
+ /**
+ * Implementation of the interface method that will follow the search
described in the class
+ * level JavaDoc and attempt to find a value for this tag.
+ *
+ * @param tag the form input tag whose value to populate
+ * @return Object will be one of null, a single Object or an Array of
Objects depending upon
+ * what was submitted in the prior request, and what is declared
on the ActionBean
+ */
+ public Object getValue(InputTagSupport tag) throws StripesJspException {
+ // If the specific tag is in error, grab the values from the request
+ if (tag.hasErrors()) {
+ return super.getValue(tag);
+ }
+ else {
+ // Try getting from the ActionBean. If the bean is present and
the property
+ // is defined, then the value from the bean takes precedence even
if it's null
+ ActionBean bean = tag.getActionBean();
+ Object value = null;
+ boolean kaboom = false;
+ if (bean != null) {
+ try {
+ value = BeanUtil.getPropertyValue(tag.getName(), bean);
+ }
+ catch (ExpressionException ee) {
+ log.info("Could not locate property of name [" +
tag.getName() + "] on ActionBean.", ee);
+ kaboom = true;
+ }
+ }
+
+ // If there's no matching bean property, then look elsewhere
+ if (bean == null || kaboom) {
+ value = getValueFromTag(tag);
+
+ if (value == null) {
+ value = getValuesFromRequest(tag);
+ }
+ }
+
+ return value;
+ }
+ }
+
+}
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