org.springframework.web.bind.support.DefaultSessionAttributeStore Maven / Gradle / Ivy
/*
* Copyright 2002-2017 the original author or authors.
*
* 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
*
* https://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.springframework.web.bind.support;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.context.request.WebRequest;
/**
* Default implementation of the {@link SessionAttributeStore} interface,
* storing the attributes in the WebRequest session (i.e. HttpSession).
*
* @author Juergen Hoeller
* @since 2.5
* @see #setAttributeNamePrefix
* @see org.springframework.web.context.request.WebRequest#setAttribute
* @see org.springframework.web.context.request.WebRequest#getAttribute
* @see org.springframework.web.context.request.WebRequest#removeAttribute
*/
public class DefaultSessionAttributeStore implements SessionAttributeStore {
private String attributeNamePrefix = "";
/**
* Specify a prefix to use for the attribute names in the backend session.
* Default is to use no prefix, storing the session attributes with the
* same name as in the model.
*/
public void setAttributeNamePrefix(@Nullable String attributeNamePrefix) {
this.attributeNamePrefix = (attributeNamePrefix != null ? attributeNamePrefix : "");
}
@Override
public void storeAttribute(WebRequest request, String attributeName, Object attributeValue) {
Assert.notNull(request, "WebRequest must not be null");
Assert.notNull(attributeName, "Attribute name must not be null");
Assert.notNull(attributeValue, "Attribute value must not be null");
String storeAttributeName = getAttributeNameInSession(request, attributeName);
request.setAttribute(storeAttributeName, attributeValue, WebRequest.SCOPE_SESSION);
}
@Override
@Nullable
public Object retrieveAttribute(WebRequest request, String attributeName) {
Assert.notNull(request, "WebRequest must not be null");
Assert.notNull(attributeName, "Attribute name must not be null");
String storeAttributeName = getAttributeNameInSession(request, attributeName);
return request.getAttribute(storeAttributeName, WebRequest.SCOPE_SESSION);
}
@Override
public void cleanupAttribute(WebRequest request, String attributeName) {
Assert.notNull(request, "WebRequest must not be null");
Assert.notNull(attributeName, "Attribute name must not be null");
String storeAttributeName = getAttributeNameInSession(request, attributeName);
request.removeAttribute(storeAttributeName, WebRequest.SCOPE_SESSION);
}
/**
* Calculate the attribute name in the backend session.
*
The default implementation simply prepends the configured
* {@link #setAttributeNamePrefix "attributeNamePrefix"}, if any.
* @param request the current request
* @param attributeName the name of the attribute
* @return the attribute name in the backend session
*/
protected String getAttributeNameInSession(WebRequest request, String attributeName) {
return this.attributeNamePrefix + attributeName;
}
}