/*
* $Id: TagModel.java 451544 2006-09-30 05:38:02Z mrdon $
*
* Copyright 2006 The Apache Software Foundation.
*
* 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 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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.components.Component;
import com.opensymphony.xwork2.util.ValueStack;
import freemarker.template.SimpleNumber;
import freemarker.template.SimpleSequence;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateTransformModel;
public abstract class TagModel implements TemplateTransformModel {
private static final Log LOG = LogFactory.getLog(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();
Map basicParams = convertParams(params);
bean.copyParams(basicParams);
bean.addAllParameters(getComplexParams(params));
return new CallbackWriter(bean, writer);
}
protected abstract Component getBean();
private 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;
}
private 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;
}
private boolean complexType(Object value) {
return value instanceof freemarker.ext.beans.BeanModel
|| value instanceof SimpleNumber
|| value instanceof SimpleSequence;
}
}