org.apache.wicket.request.parameter.EmptyRequestParameters Maven / Gradle / Ivy
/*
* 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.wicket.request.parameter;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.apache.wicket.request.IRequestParameters;
import org.apache.wicket.util.string.StringValue;
/**
* Read only empty {@link IRequestParameters}.
*
* @author Matej Knopp
*/
public class EmptyRequestParameters implements IRequestParameters
{
/** Singleton instance. */
public static final EmptyRequestParameters INSTANCE = new EmptyRequestParameters();
/**
* Construct.
*/
private EmptyRequestParameters()
{
}
/**
* @see org.apache.wicket.request.IRequestParameters#getParameterNames()
*/
@Override
public Set getParameterNames()
{
return Collections.emptySet();
}
/**
* @see org.apache.wicket.request.IRequestParameters#getParameterValue(java.lang.String)
*/
@Override
public StringValue getParameterValue(final String name)
{
return StringValue.valueOf((String)null);
}
/**
* @see org.apache.wicket.request.IRequestParameters#getParameterValues(java.lang.String)
*/
@Override
public List getParameterValues(final String name)
{
return null;
}
}