javax.faces.validator.MethodExpressionValidator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of javax.faces Show documentation
Show all versions of javax.faces Show documentation
This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.validator;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
/**
* MethodExpressionValidator
* is a {@link Validator} that wraps a {@link MethodExpression}, and it
* performs validation by executing a method on an object identified by
* the {@link MethodExpression}.
*/
public class MethodExpressionValidator implements Validator, StateHolder {
private static final String BEANS_VALIDATION_AVAILABLE =
"javax.faces.private.BEANS_VALIDATION_AVAILABLE";
private static final String VALIDATE_EMPTY_FIELDS_PARAM_NAME =
"javax.faces.VALIDATE_EMPTY_FIELDS";
// ------------------------------------------------------ Instance Variables
private MethodExpression methodExpression = null;
private Boolean validateEmptyFields;
public MethodExpressionValidator() {
super();
}
/**
* Construct a {@link Validator} that contains a {@link MethodExpression}.
*
* @param methodExpression the expression to wrap
*/
public MethodExpressionValidator(MethodExpression methodExpression) {
super();
this.methodExpression = methodExpression;
}
// ------------------------------------------------------- Validator Methods
/**
* @throws NullPointerException {@inheritDoc}
* @throws ValidatorException {@inheritDoc}
*/
@Override
public void validate(FacesContext context,
UIComponent component,
Object value) throws ValidatorException {
if ((context == null) || (component == null)) {
throw new NullPointerException();
}
if (validateEmptyFields(context) || value != null) {
try {
ELContext elContext = context.getELContext();
methodExpression.invoke(elContext, new Object[]{context, component, value});
} catch (ELException ee) {
Throwable e = ee.getCause();
if (e instanceof ValidatorException) {
throw (ValidatorException) e;
} else {
throw ee;
}
}
}
}
// ----------------------------------------------------- StateHolder Methods
@Override
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
Object values[] = new Object[1];
values[0] = methodExpression;
return (values);
}
@Override
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
return;
}
Object values[] = (Object[]) state;
methodExpression = (MethodExpression) values[0];
}
private boolean transientValue;
@Override
public boolean isTransient() {
return (this.transientValue);
}
@Override
public void setTransient(boolean transientValue) {
this.transientValue = transientValue;
}
private boolean validateEmptyFields(FacesContext ctx) {
if (validateEmptyFields == null) {
ExternalContext extCtx = ctx.getExternalContext();
String val = extCtx.getInitParameter(VALIDATE_EMPTY_FIELDS_PARAM_NAME);
if (null == val) {
val = (String) extCtx.getApplicationMap().get(VALIDATE_EMPTY_FIELDS_PARAM_NAME);
}
if (val == null || "auto".equals(val)) {
validateEmptyFields = isBeansValidationAvailable(ctx);
} else {
validateEmptyFields = Boolean.valueOf(val);
}
}
return validateEmptyFields;
}
private boolean isBeansValidationAvailable(FacesContext context) {
boolean result = false;
Map appMap = context.getExternalContext().getApplicationMap();
if (appMap.containsKey(BEANS_VALIDATION_AVAILABLE)) {
result = (Boolean) appMap.get(BEANS_VALIDATION_AVAILABLE);
} else {
try {
new BeanValidator();
appMap.put(BEANS_VALIDATION_AVAILABLE, Boolean.TRUE);
result = true;
} catch (Throwable t) {
appMap.put(BEANS_VALIDATION_AVAILABLE, Boolean.FALSE);
}
}
return result;
}
}