/*
* $Id: TagModel.java 651946 2008-04-27 13:41:38Z apetrelli $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.struts2.views.freemarker.tags;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.components.Component;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.SimpleNumber;
import freemarker.template.SimpleSequence;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateTransformModel;
public abstract class TagModel implements TemplateTransformModel {
private static final Logger LOG = LoggerFactory.getLogger(TagModel.class);
protected ValueStack stack;
protected HttpServletRequest req;
protected HttpServletResponse res;
public TagModel(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {
this.stack = stack;
this.req = req;
this.res = res;
}
public Writer getWriter(Writer writer, Map params)
throws TemplateModelException, IOException {
Component bean = getBean();
Container container = (Container) stack.getContext().get(ActionContext.CONTAINER);
container.inject(bean);
Map unwrappedParameters = unwrapParameters(params);
bean.copyParams(unwrappedParameters);
return new CallbackWriter(bean, writer);
}
protected abstract Component getBean();
protected Map unwrapParameters(Map params) {
Map map = new HashMap(params.size());
DefaultObjectWrapper objectWrapper = new DefaultObjectWrapper();
for (Iterator iterator = params.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
Object value = entry.getValue();
if (value != null) {
// the value should ALWAYS be a decendant of TemplateModel
if (value instanceof TemplateModel) {
try {
map.put(entry.getKey(), objectWrapper
.unwrap((TemplateModel) value));
} catch (TemplateModelException e) {
LOG.error("failed to unwrap [" + value
+ "] it will be ignored", e);
}
}
// if it doesn't, we'll do it the old way by just returning the toString() representation
else {
map.put(entry.getKey(), value.toString());
}
}
}
return map;
}
protected Map convertParams(Map params) {
HashMap map = new HashMap(params.size());
for (Iterator iterator = params.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
Object value = entry.getValue();
if (value != null && !complexType(value)) {
map.put(entry.getKey(), value.toString());
}
}
return map;
}
protected Map getComplexParams(Map params) {
HashMap map = new HashMap(params.size());
for (Iterator iterator = params.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
Object value = entry.getValue();
if (value != null && complexType(value)) {
if (value instanceof freemarker.ext.beans.BeanModel) {
map.put(entry.getKey(), ((freemarker.ext.beans.BeanModel) value).getWrappedObject());
} else if (value instanceof SimpleNumber) {
map.put(entry.getKey(), ((SimpleNumber) value).getAsNumber());
} else if (value instanceof SimpleSequence) {
try {
map.put(entry.getKey(), ((SimpleSequence) value).toList());
} catch (TemplateModelException e) {
LOG.error("There was a problem converting a SimpleSequence to a list", e);
}
}
}
}
return map;
}
protected boolean complexType(Object value) {
return value instanceof freemarker.ext.beans.BeanModel
|| value instanceof SimpleNumber
|| value instanceof SimpleSequence;
}
}