org.apache.struts2.interceptor.MessageStorePreResultListener Maven / Gradle / Ivy
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* distributed with this work for additional information
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.struts2.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.config.entities.ResultConfig;
import com.opensymphony.xwork2.interceptor.PreResultListener;
import com.opensymphony.xwork2.interceptor.ValidationAware;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.result.Redirectable;
import java.util.Map;
/**
* This listener is used by {@link MessageStoreInterceptor} to store messages in HttpSession
* just before result will be executed. It must be done that way as after result will be executed
* HttpSession cannot be modified (response was already sent to browser).
*/
public class MessageStorePreResultListener implements PreResultListener {
private static final Logger LOG = LogManager.getLogger(MessageStorePreResultListener.class);
protected MessageStoreInterceptor interceptor;
public void init(MessageStoreInterceptor interceptor) {
this.interceptor = interceptor;
}
@Override
public void beforeResult(ActionInvocation invocation, String resultCode) {
boolean isCommitted = isCommitted();
if (isCommitted) {
LOG.trace("Response was already committed, cannot store messages!");
return;
}
boolean isInvalidated = isInvalidated();
if (isInvalidated) {
LOG.trace("Session was invalidated or never created, cannot store messages!");
return;
}
Map session = invocation.getInvocationContext().getSession();
if (session == null) {
LOG.trace("Could not store action [{}] error/messages into session, because session hasn't been opened yet.", invocation.getAction());
return;
}
String reqOperationMode = interceptor.getRequestOperationMode(invocation);
boolean isRedirect = isRedirect(invocation, resultCode);
if (MessageStoreInterceptor.STORE_MODE.equalsIgnoreCase(reqOperationMode) ||
MessageStoreInterceptor.STORE_MODE.equalsIgnoreCase(interceptor.getOperationModel()) ||
(MessageStoreInterceptor.AUTOMATIC_MODE.equalsIgnoreCase(interceptor.getOperationModel()) && isRedirect)) {
Object action = invocation.getAction();
if (action instanceof ValidationAware) {
LOG.debug("Storing action [{}] error/messages into session ", action);
ValidationAware validationAwareAction = (ValidationAware) action;
session.put(MessageStoreInterceptor.actionErrorsSessionKey, validationAwareAction.getActionErrors());
session.put(MessageStoreInterceptor.actionMessagesSessionKey, validationAwareAction.getActionMessages());
session.put(MessageStoreInterceptor.fieldErrorsSessionKey, validationAwareAction.getFieldErrors());
} else {
LOG.debug("Action [{}] is not ValidationAware, no message / error that are storeable", action);
}
}
}
protected boolean isCommitted() {
return ServletActionContext.getResponse().isCommitted();
}
protected boolean isInvalidated() {
return ServletActionContext.getRequest().getSession(false) == null;
}
protected boolean isRedirect(ActionInvocation invocation, String resultCode) {
boolean isRedirect = false;
try {
ResultConfig resultConfig = invocation.getProxy().getConfig().getResults().get(resultCode);
if (resultConfig != null) {
isRedirect = Redirectable.class.isAssignableFrom(Class.forName(resultConfig.getClassName()));
}
} catch (Exception e) {
LOG.warn("Cannot read result!", e);
}
return isRedirect;
}
}