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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.component.validator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.sun.faces.facelets.tag.faces.ComponentSupport;
import com.sun.faces.util.RequestStateManager;
import jakarta.faces.application.Application;
import jakarta.faces.component.EditableValueHolder;
import jakarta.faces.context.FacesContext;
import jakarta.faces.validator.Validator;
import jakarta.faces.view.facelets.FaceletContext;
import jakarta.faces.view.facelets.ValidatorHandler;
/**
*
* This class is responsible for adding default validators and/or validators that wrap multiple
* EditableValueHolder instances within the view.
*
*/
public class ComponentValidators {
/**
* Key within the FacesContext's attribute map under which a single ComponentValidators
* instance will be stored.
*/
private static final String COMPONENT_VALIDATORS = "jakarta.faces.component.ComponentValidators";
/**
* Stack of ValidatorInfo instances. Each instance represents
* a particular nesting level within the view. As a nesting level is encountered,
* a ValidatorInfo will be pushed to the stack and all EditableValueHolder instances will be
* configured based on all ValidatorInfos on the stack. When the current nesting level is closed, the
* ValidatorInfo instance will be popped and thus have no impact on other
* EditableValueHolders.
*/
private LinkedList validatorStack = null;
// ------------------------------------------------------------ Constructors
public ComponentValidators() {
validatorStack = new LinkedList<>();
}
// ---------------------------------------------------------- Public Methods
/**
* @param context the FacesContext for the current request
* @param createIfNull flag indicating whether or not a ComponentValidators instance should be created or
* not
* @return a ComponentValidators instance for processing a view request. If createIfNull is
* false and no ComponentValidators has been created, this method will return
* null
*/
public static ComponentValidators getValidators(FacesContext context, boolean createIfNull) {
Map attrs = context.getAttributes();
ComponentValidators componentValidators = (ComponentValidators) attrs.get(COMPONENT_VALIDATORS);
if (componentValidators == null && createIfNull) {
componentValidators = new ComponentValidators();
attrs.put(COMPONENT_VALIDATORS, componentValidators);
}
return componentValidators;
}
/**
*
* Creates and installs default validators, if any, into the argument EditableValueHolder. This method is
* merely a utility method to be called when there is no ComponentValidators available, or there are no
* ValidatorInfo instances on the stack.
*
*
* @param ctx the FacesContext for the current request
* @param editableValueHolder the component receiving the Validators
*/
@SuppressWarnings({ "unchecked" })
public static void addDefaultValidatorsToComponent(FacesContext ctx, EditableValueHolder editableValueHolder) {
if (ComponentSupport.isBuildingNewComponentTree(ctx)) {
Set keySet = ctx.getApplication().getDefaultValidatorInfo().keySet();
List validatorIds = new ArrayList<>(keySet.size());
Set disabledValidatorIds = (Set) RequestStateManager.remove(ctx, RequestStateManager.DISABLED_VALIDATORS);
for (String key : keySet) {
if (disabledValidatorIds != null && disabledValidatorIds.contains(key)) {
continue;
}
validatorIds.add(key);
}
addValidatorsToComponent(ctx, validatorIds, editableValueHolder, null);
}
}
/**
*
* Based on the ValidatorInfo instances present on the stack, configure the argument
* EditableValueHolder with Validators created from the available info.
*
*
* @param ctx the FacesContext for the current request
* @param editableValueHolder the component receiving the Validators
*/
@SuppressWarnings({ "unchecked" })
public void addValidators(FacesContext ctx, EditableValueHolder editableValueHolder) {
if (validatorStack == null || validatorStack.isEmpty()) {
addDefaultValidatorsToComponent(ctx, editableValueHolder);
return;
}
Application application = ctx.getApplication();
Map defaultValidatorInfo = application.getDefaultValidatorInfo();
Set keySet = defaultValidatorInfo.keySet();
List validatorIds = new ArrayList<>(keySet.size());
validatorIds.addAll(keySet);
Set disabledIds = (Set) RequestStateManager.remove(ctx, RequestStateManager.DISABLED_VALIDATORS);
int count = validatorStack.size();
for (int i = count - 1; i >= 0; i--) {
ValidatorInfo info = validatorStack.get(i);
if (!info.isEnabled() || disabledIds != null && disabledIds.contains(info.getValidatorId())) {
validatorIds.remove(info.getValidatorId());
} else {
if (!validatorIds.contains(info.getValidatorId())) {
validatorIds.add(info.getValidatorId());
}
}
}
// add the validators to the EditableValueHolder.
addValidatorsToComponent(ctx, validatorIds, editableValueHolder, validatorStack == null || validatorStack.isEmpty() ? null : validatorStack);
}
/**
*
* Pushes the provided ValidatorInfo onto the stack.
*
*
* @param info validator info
*/
public void pushValidatorInfo(ValidatorInfo info) {
validatorStack.add(info);
}
/**
*
* Pops the last ValidatorInfo instance from the stack.
*
*/
public void popValidatorInfo() {
if (validatorStack.size() > 0) {
validatorStack.removeLast();
}
}
// --------------------------------------------------------- Private Methods
/**
*
* Install the validators, if not already present on the component, using the IDs included in validatorIds.
*
*
* @param ctx the FacesContext for the current request
* @param validatorIds the validator IDs to be added to the EditableValueHolder
* @param editableValueHolder the target component to which the validators installed
* @param validatorStack current stack of ValidatorInfo instances
*/
private static void addValidatorsToComponent(FacesContext ctx, Collection validatorIds, EditableValueHolder editableValueHolder,
LinkedList validatorStack) {
if (validatorIds == null || validatorIds.isEmpty()) {
return;
}
Application application = ctx.getApplication();
Map defaultValidatorInfo = application.getDefaultValidatorInfo();
Validator[] validators = editableValueHolder.getValidators();
// check to make sure that Validator instances haven't already
// been added.
for (Map.Entry defaultValidator : defaultValidatorInfo.entrySet()) {
for (Validator validator : validators) {
if (defaultValidator.getValue().equals(validator.getClass().getName())) {
validatorIds.remove(defaultValidator.getKey());
break;
}
}
}
// we now have the complete List of Validator IDs to add to the
// target EditablValueHolder
for (String id : validatorIds) {
Validator v = application.createValidator(id);
// work backwards up the stack of ValidatorInfo to find the
// nearest matching ValidatorInfo to apply attributes
if (validatorStack != null) {
for (int i = validatorStack.size() - 1; i >= 0; i--) {
ValidatorInfo info = validatorStack.get(i);
if (id.equals(info.getValidatorId())) {
info.applyAttributes(v);
break;
}
}
}
editableValueHolder.addValidator(v);
}
}
// ---------------------------------------------------------- Nested Classes
/**
* Generic information container for a validator at a particular nesting Level.
*/
public static class ValidatorInfo {
private final String validatorId;
private final boolean enabled;
private final ValidatorHandler owner;
private final FaceletContext ctx;
// ------------------------------------------------------------ Constructors
public ValidatorInfo(FaceletContext ctx, ValidatorHandler owner) {
this.owner = owner;
this.ctx = ctx;
validatorId = owner.getValidatorId(ctx);
enabled = !owner.isDisabled(ctx);
}
// -------------------------------------------------------------------------
public String getValidatorId() {
return validatorId;
}
public boolean isEnabled() {
return enabled;
}
public void applyAttributes(Validator v) {
owner.setAttributes(ctx, v);
}
} // END ValidatorInfo
}
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