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net.anotheria.anosite.wizard.handler.BaseWizardHandler Maven / Gradle / Ivy
package net.anotheria.anosite.wizard.handler;
import net.anotheria.anoplass.api.APIFinder;
import net.anotheria.anosite.gen.aswizarddata.data.WizardDef;
import net.anotheria.anosite.wizard.WizardCommand;
import net.anotheria.anosite.wizard.api.WizardAO;
import net.anotheria.anosite.wizard.api.WizardAPI;
import net.anotheria.anosite.wizard.api.WizardStepAO;
import net.anotheria.anosite.wizard.api.exception.WizardAPIException;
import net.anotheria.anosite.wizard.api.exception.WizardAPIFirstStepException;
import net.anotheria.anosite.wizard.api.exception.WizardAPILastStepException;
import net.anotheria.anosite.wizard.handler.exceptions.WizardHandlerException;
import net.anotheria.anosite.wizard.handler.exceptions.WizardHandlerPreProcessException;
import net.anotheria.anosite.wizard.handler.exceptions.WizardHandlerProcessException;
import net.anotheria.anosite.wizard.handler.exceptions.WizardHandlerSubmitException;
import net.anotheria.anosite.wizard.handler.response.WizardHandlerResponse;
import net.anotheria.anosite.wizard.handler.response.WizardResponseCancel;
import net.anotheria.anosite.wizard.handler.response.WizardResponseChangeStep;
import net.anotheria.anosite.wizard.handler.response.WizardResponseContinue;
import net.anotheria.anosite.wizard.handler.response.WizardResponseFinish;
import net.anotheria.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import static net.anotheria.anosite.handler.validation.AbstractValidationBoxHandler.REQ_PARAM_VALIDATION_ONLY;
/**
* BaseWizardHandler as main class for Wizard handlers.
* Used as Default WizardHandler for wizards where handler is not specified.
* Can be simply extended.
*
* @author h3ll
*/
public class BaseWizardHandler implements WizardHandler {
/**
* Log4j logger.
*/
private Logger log;
/**
* WizardAPI instance.
*/
private WizardAPI wizardAPI;
/**
* Constructor.
*/
protected BaseWizardHandler() {
log = LoggerFactory.getLogger(this.getClass());
wizardAPI = APIFinder.findAPI(WizardAPI.class);
}
@Override
public WizardHandlerResponse preProcess(HttpServletRequest req, HttpServletResponse res, WizardDef wizard) throws WizardHandlerPreProcessException {
// adding cache control headers
addCacheControlHeadersToResponse(res);
return WizardResponseContinue.INSTANCE;
}
@Override
public WizardHandlerResponse process(HttpServletRequest req, HttpServletResponse res, WizardDef wizard) throws WizardHandlerProcessException {
if (wizard.getWizardStepsSize() == 0)
throw new WizardHandlerProcessException(wizard.getId(), " wizard Steps are not configured!");
// adding cache control headers
addCacheControlHeadersToResponse(res);
try {
WizardAO wizardAO = wizardAPI.getWizard(wizard.getId());
WizardStepAO currentStep = wizardAPI.getCurrentStep(wizard.getId());
return handleIncomingCommand(req, wizardAO, currentStep, false);
} catch (WizardAPIException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerProcessException(e.getMessage(), e);
} catch (WizardHandlerException e) {
log.error("process failed", e);
throw new WizardHandlerProcessException(e.getMessage(), e);
}
}
@Override
public WizardHandlerResponse submit(HttpServletRequest req, HttpServletResponse res, WizardDef wizard) throws WizardHandlerSubmitException {
try {
WizardAO wizardAO = wizardAPI.getWizard(wizard.getId());
WizardStepAO currentStep = wizardAPI.getCurrentStep(wizard.getId());
return handleIncomingCommand(req, wizardAO, currentStep, true);
} catch (WizardHandlerException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerSubmitException(e.getMessage(), e);
} catch (WizardAPIException e) {
log.error("submit failed", e);
throw new WizardHandlerSubmitException(e.getMessage(), e);
}
}
/**
* Returns true if we can be forwarded to next step. False otherwise.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param step {@link WizardStepAO}
* @param isSubmit boolean value - true if called from submit
* @return boolean value
*/
protected boolean isNextStepAllowed(HttpServletRequest req, WizardAO wizard, WizardStepAO step, boolean isSubmit) {
return req.getParameter(REQ_PARAM_VALIDATION_ONLY) == null && isSubmit;
}
/**
* Returns true if we can be forwarded to previous step. False otherwise.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param step {@link WizardStepAO}
* @param isSubmit boolean value - true if called from submit
* @return boolean value
*/
protected boolean isPreviousStepAllowed(HttpServletRequest req, WizardAO wizard, WizardStepAO step, boolean isSubmit) {
return !isSubmit;
}
/**
* Returns true if we can finish wizard.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param step {@link WizardStepAO}
* @param isSubmit boolean value - true if called from submit
* @return boolean value
*/
protected boolean isFinishAllowed(HttpServletRequest req, WizardAO wizard, WizardStepAO step, boolean isSubmit) {
return req.getParameter(REQ_PARAM_VALIDATION_ONLY) == null && isSubmit;
}
/**
* Returns true if we can cancel wizard.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param step {@link WizardStepAO}
* @param isSubmit boolean value - true if called from submit
* @return boolean value
*/
protected boolean isCancellationAllowed(HttpServletRequest req, WizardAO wizard, WizardStepAO step, boolean isSubmit) {
return !isSubmit;
}
/**
* Handle incoming command method.
* Checks which command should be executed, and execute it.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardDef}
* @param currentStep {@link WizardStepAO}
* @param isSubmit boolean value - true if called from submit
* @return {@link WizardHandlerResponse}
* @throws net.anotheria.anosite.wizard.handler.exceptions.WizardHandlerException
* on errors
*/
protected WizardHandlerResponse handleIncomingCommand(HttpServletRequest req, WizardAO wizard, WizardStepAO currentStep,
boolean isSubmit) throws WizardHandlerException {
@SuppressWarnings({"unchecked"})
WizardCommand command = WizardCommand.getCommandByValue(req.getParameterMap());
switch (command) {
case FINISH:
return processFinish(req, wizard, currentStep, isSubmit);
case CANCEL:
return processCancel(req, wizard, currentStep, isSubmit);
case PREVIOUS:
return processPreviousStep(req, wizard, currentStep, isSubmit);
case NEXT:
return processNextStep(req, wizard, currentStep, isSubmit);
case NAVIGATE_TO:
return processNavigateToStep(req, wizard, currentStep, isSubmit);
default:
getLogger().warn("Default Command - execution!");
return processNextStep(req, wizard, currentStep, isSubmit);
}
}
/**
* Process finish command.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param currentStep {@link WizardStepAO}
* @param isSubmit boolean flag
* @return {@link WizardHandlerResponse}
* @throws WizardHandlerException on errors from {@link WizardAPI}
*/
private WizardHandlerResponse processFinish(HttpServletRequest req, WizardAO wizard, WizardStepAO currentStep, boolean isSubmit) throws WizardHandlerException {
if (!isFinishAllowed(req, wizard, currentStep, isSubmit)) {
log.debug("Wizard finish {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
}
log.debug("Wizard finished {" + wizard.getId() + "}");
try {
if (wizardAPI.finishWizard(wizard))
return new WizardResponseFinish(wizard.getFinishRedirectUrl());
log.debug("Wizard finish {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
} catch (WizardAPIException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerException(e.getMessage(), e);
}
}
/**
* Process CancelCommand.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param currentStep {@link WizardStepAO}
* @param isSubmit boolean flag
* @return {@link WizardHandlerResponse}
* @throws WizardHandlerException on errors from {@link WizardAPI}
*/
private WizardHandlerResponse processCancel(HttpServletRequest req, WizardAO wizard, WizardStepAO currentStep, boolean isSubmit) throws WizardHandlerException {
if (!isCancellationAllowed(req, wizard, currentStep, isSubmit)) {
log.debug("Wizard cancel {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
}
try {
if (wizardAPI.cancelWizard(wizard))
return new WizardResponseCancel(wizard.getCancelRedirectUrl());
log.debug("Wizard cancel {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
} catch (WizardAPIException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerException(e.getMessage(), e);
}
}
/**
* Process Previous step.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param currentStep {@link WizardStepAO}
* @param isSubmit boolean flag
* @return {@link WizardHandlerResponse}
* @throws WizardHandlerException on {@link WizardAPI} errors
*/
private WizardHandlerResponse processPreviousStep(HttpServletRequest req, WizardAO wizard, WizardStepAO currentStep, boolean isSubmit) throws WizardHandlerException {
if (!isPreviousStepAllowed(req, wizard, currentStep, isSubmit)) {
log.debug("Wizard previous step {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
}
try {
log.debug("Wizard previous step {" + wizard.getId() + "}");
WizardStepAO changed = wizardAPI.adjustToPreviousStep(wizard.getId());
//if step was changed!
if (changed.equals(currentStep)) {
//only logging!! Anyway changing step - simply to remove back-step parameter!
log.debug("Wizard previous step {" + wizard.getId() + "} not performed");
}
return WizardResponseChangeStep.INSTANCE;
} catch (WizardAPIFirstStepException e) {
return WizardResponseContinue.INSTANCE;
} catch (WizardAPIException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerException(e.getMessage(), e);
}
}
/**
* Handle navigate to command.
* Current method will allow navigation only to passed steps!!!
*
* @param req {@link HttpServletRequest}
* @param wizard {@link HttpServletResponse}
* @param currentStep {@link WizardStepAO}
* @param isSubmit is submit operation
* @return {@link WizardHandlerResponse}
* @throws WizardHandlerException on errors
*/
private WizardHandlerResponse processNavigateToStep(HttpServletRequest req, WizardAO wizard, WizardStepAO currentStep, boolean isSubmit) throws WizardHandlerException {
if (isSubmit) {
log.warn("Menu rendering is disabled. NAVIGATE_TO can't be executed.");
return WizardResponseContinue.INSTANCE;
}
String stepIndex = req.getParameter(WizardCommand.NAVIGATE_TO.getCommandTitle());
if (StringUtils.isEmpty(stepIndex)) {
log.warn("Required parameter not found.");
return WizardResponseContinue.INSTANCE;
}
int stepNumber = Integer.valueOf(stepIndex);
if (stepNumber < 0 || stepNumber >= wizard.getWizardSteps().size()) {
log.debug("Illegal step " + stepNumber);
return WizardResponseContinue.INSTANCE;
}
try {
@SuppressWarnings({"UnusedDeclaration"})
WizardStepAO nextStep = wizardAPI.adjustToStep(wizard.getId(), stepNumber);
if (nextStep.equals(currentStep)) {
//only logging!! Anyway changing step - simply to remove back-step parameter!
log.debug("step number is current");
}
return WizardResponseChangeStep.INSTANCE;
} catch (WizardAPIException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerException("process navigateToStep failed step:{" + stepIndex + "}", e);
}
}
/**
* Process next step command.
*
* @param req {@link HttpServletRequest}
* @param wizard {@link WizardAO}
* @param currentStep {@link WizardStepAO}
* @param isSubmit is submit
* @return {@link WizardHandlerResponse}
* @throws WizardHandlerException on errors
*/
private WizardHandlerResponse processNextStep(HttpServletRequest req, WizardAO wizard, WizardStepAO currentStep, boolean isSubmit)
throws WizardHandlerException {
if (!isNextStepAllowed(req, wizard, currentStep, isSubmit)) {
log.debug("Wizard next step {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
}
try {
WizardStepAO changed = wizardAPI.adjustToNextStep(wizard.getId());
if (changed.equals(currentStep)) {
log.debug("Wizard next step {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
}
return WizardResponseChangeStep.INSTANCE;
} catch (WizardAPILastStepException e) {
//Last step! trying to finish wizard
try {
if (wizardAPI.finishWizard(wizard))
return new WizardResponseFinish(wizard.getFinishRedirectUrl());
log.debug("Wizard finish step {" + wizard.getId() + "} not performed");
return WizardResponseContinue.INSTANCE;
} catch (WizardAPIException e1) {
log.error("WizardAPI failed", e);
throw new WizardHandlerException(e1.getMessage(), e1);
}
} catch (WizardAPIException e) {
log.error("WizardAPI failed", e);
throw new WizardHandlerException(e.getMessage(), e);
}
}
/**
* Current method add browser cache-control headers to response.
* Current will disable browser cache for all wizard pages.
*
* Headers "Cache-Control", "Pragma", "Expires" with values. etc.
*
* @param response {@link HttpServletResponse}
*/
private void addCacheControlHeadersToResponse(HttpServletResponse response) {
// "Cache-Control" header.
response.setHeader("Cache-Control", "no-cache, no-store, post-check=0, pre-check=0");
// "Pragma" header .
response.setHeader("Pragma", "no-cache");
// "Expires" header.
response.setHeader("Expires", "Thu, 01 Dec 1994 16:00:00 GMT");
}
/**
* Returns logger.
*
* @return {@link Logger}
*/
protected Logger getLogger() {
return log;
}
/**
* Return {@link WizardAPI}.
*
* @return {@link WizardAPI}
*/
public WizardAPI getWizardAPI() {
return wizardAPI;
}
}
