Java tutorial
/* * Copyright 2010 Lincoln Baxter, III * * 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 com.ocpsoft.pretty.faces.beans; import java.io.IOException; import java.util.List; import javax.el.ELException; import javax.faces.FacesException; import javax.faces.application.FacesMessage; import javax.faces.component.UIComponent; import javax.faces.context.FacesContext; import javax.faces.validator.Validator; import javax.faces.validator.ValidatorException; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.ocpsoft.pretty.PrettyContext; import com.ocpsoft.pretty.PrettyException; import com.ocpsoft.pretty.faces.config.mapping.PathParameter; import com.ocpsoft.pretty.faces.config.mapping.PathValidator; import com.ocpsoft.pretty.faces.config.mapping.QueryParameter; import com.ocpsoft.pretty.faces.config.mapping.UrlMapping; import com.ocpsoft.pretty.faces.url.URL; import com.ocpsoft.pretty.faces.util.FacesElUtils; import com.ocpsoft.pretty.faces.util.NullComponent; /** * @author Lincoln Baxter, III <lincoln@ocpsoft.com> */ public class ParameterValidator { private static final Log log = LogFactory.getLog(ParameterInjector.class); private static final FacesElUtils elUtils = new FacesElUtils(); public void validateParameters(final FacesContext context) { log.trace("Validating parameters."); PrettyContext prettyContext = PrettyContext.getCurrentInstance(context); URL url = prettyContext.getRequestURL(); UrlMapping mapping = prettyContext.getCurrentMapping(); if (mapping != null) { validatePathParams(context, url, mapping); validateQueryParams(context, mapping); } } private void validatePathParams(final FacesContext context, final URL url, final UrlMapping mapping) { List<PathParameter> params = mapping.getPatternParser().parse(url); PathParameter currentParameter = new PathParameter(); PathValidator currentPathValidator = new PathValidator(); String currentValidatorId = ""; try { for (PathParameter param : params) { currentParameter = param; List<PathValidator> validators = mapping.getValidatorsForPathParam(param); if (validators != null && validators.size() > 0) { String value = param.getValue(); Object coerced = elUtils.coerceToType(context, param.getExpression().getELExpression(), value); for (PathValidator pv : validators) { currentPathValidator = pv; for (String id : pv.getValidatorIdList()) { currentValidatorId = id; Validator validator = context.getApplication().createValidator(id); validator.validate(context, new NullComponent(), coerced); } if (pv.getValidatorExpression() != null) { elUtils.invokeMethod(context, pv.getValidatorExpression().getELExpression(), new Class<?>[] { FacesContext.class, UIComponent.class, Object.class }, new Object[] { context, new NullComponent(), coerced }); } } } } } catch (ELException e) { FacesMessage message = new FacesMessage( "Could not coerce value [" + currentParameter.getValue() + "] on mappingId [" + mapping.getId() + "] to type in location [" + currentParameter.getExpression() + "]"); handleValidationFailure(context, message, currentPathValidator.getOnError()); } catch (ValidatorException e) { handleValidationFailure(context, e.getFacesMessage(), currentPathValidator.getOnError()); } catch (FacesException e) { FacesMessage message = new FacesMessage("Error occurred invoking validator with id [" + currentValidatorId + "] on mappingId [" + mapping.getId() + "] parameter [" + currentParameter.getExpression() + "] at position [" + currentParameter.getPosition() + "]"); handleValidationFailure(context, message, currentPathValidator.getOnError()); } } private void validateQueryParams(final FacesContext context, final UrlMapping mapping) { QueryParameter currentParameter = new QueryParameter(); String currentValidatorId = ""; try { List<QueryParameter> params = mapping.getQueryParams(); for (QueryParameter param : params) { if (param.hasValidators() || (param.getValidatorExpression() != null)) { currentParameter = param; String name = param.getName(); String el = param.getExpression().getELExpression(); if (elUtils.getExpectedType(context, el).isArray()) { String[] values = context.getExternalContext().getRequestParameterValuesMap().get(name); if (values != null) { Object coerced = elUtils.coerceToType(context, el, values); for (String id : param.getValidatorIdList()) { currentValidatorId = id; Validator validator = context.getApplication().createValidator(id); validator.validate(context, new NullComponent(), coerced); } if (param.getValidatorExpression() != null) { elUtils.invokeMethod(context, param.getValidatorExpression().getELExpression(), new Class<?>[] { FacesContext.class, UIComponent.class, Object.class }, new Object[] { context, new NullComponent(), coerced }); } } } else { String value = context.getExternalContext().getRequestParameterMap().get(name); if (value != null) { Object coerced = elUtils.coerceToType(context, el, value); for (String id : param.getValidatorIdList()) { currentValidatorId = id; Validator validator = context.getApplication().createValidator(id); validator.validate(context, new NullComponent(), coerced); } if (param.getValidatorExpression() != null) { elUtils.invokeMethod(context, param.getValidatorExpression().getELExpression(), new Class<?>[] { FacesContext.class, UIComponent.class, Object.class }, new Object[] { context, new NullComponent(), coerced }); } } } } } } catch (ELException e) { FacesMessage message = new FacesMessage("Could not coerce value [" + currentParameter.getValue() + "] on mappingId [" + mapping.getId() + "] to type [" + elUtils.getExpectedType(context, currentParameter.getExpression().getELExpression()) + "]"); handleValidationFailure(context, message, currentParameter.getOnError()); } catch (ValidatorException e) { handleValidationFailure(context, e.getFacesMessage(), currentParameter.getOnError()); } catch (FacesException e) { FacesMessage message = new FacesMessage( "Error occurred invoking validator with id [" + currentValidatorId + "] on mappingId [" + mapping.getId() + "] parameter [" + currentParameter.getName() + "]"); handleValidationFailure(context, message, currentParameter.getOnError()); } } private void handleValidationFailure(final FacesContext context, final FacesMessage message, String onError) { boolean continueToFaces = false; if ((onError != null) && !"".equals(onError.trim())) { if (elUtils.isEl(onError)) { Object result = elUtils.invokeMethod(context, onError); if (result == null) { continueToFaces = true; } else { onError = result.toString(); } } if (onError != null) { String viewId = context.getViewRoot().getViewId(); context.getApplication().getNavigationHandler().handleNavigation(context, viewId, onError); } } if (!context.getResponseComplete() && !continueToFaces) { HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse(); try { response.sendError(HttpServletResponse.SC_NOT_FOUND); context.responseComplete(); } catch (IOException e1) { throw new PrettyException(e1); } } } }