/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* 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 freemarker.ext.servlet;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import freemarker.template.SimpleCollection;
import freemarker.template.SimpleScalar;
import freemarker.template.TemplateCollectionModel;
import freemarker.template.TemplateHashModelEx;
import freemarker.template.TemplateModel;
/**
* TemplateHashModel wrapper for a HttpServletRequest parameters.
*/
public class HttpRequestParametersHashModel
implements
TemplateHashModelEx
{
private final HttpServletRequest request;
private List keys;
public HttpRequestParametersHashModel(HttpServletRequest request)
{
this.request = request;
}
public TemplateModel get(String key)
{
String value = request.getParameter(key);
return value == null ? null : new SimpleScalar(value);
}
public boolean isEmpty()
{
return !request.getParameterNames().hasMoreElements();
}
public int size() {
return getKeys().size();
}
public TemplateCollectionModel keys() {
return new SimpleCollection(getKeys().iterator());
}
public TemplateCollectionModel values() {
final Iterator iter = getKeys().iterator();
return new SimpleCollection(
new Iterator() {
public boolean hasNext() {
return iter.hasNext();
}
public Object next() {
return request.getParameter((String)iter.next());
}
public void remove() {
throw new UnsupportedOperationException();
}
});
}
protected String transcode(String string)
{
return string;
}
private synchronized List getKeys() {
if(keys == null) {
keys = new ArrayList();
for (Enumeration enumeration = request.getParameterNames(); enumeration.hasMoreElements();) {
keys.add(enumeration.nextElement());
}
}
return keys;
}
}