/*
* Copyright 2002-2007,2009 The Apache Software Foundation.
*
* 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.opensymphony.xwork2.validator;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionProxy;
import com.opensymphony.xwork2.Validateable;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
import com.opensymphony.xwork2.interceptor.PrefixMethodInvocationUtil;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
/**
* <!-- START SNIPPET: description -->
*
* This interceptor runs the action through the standard validation framework, which in turn checks the action against
* any validation rules (found in files such as <i>ActionClass-validation.xml</i>) and adds field-level and action-level
* error messages (provided that the action implements {@link com.opensymphony.xwork2.ValidationAware}). This interceptor
* is often one of the last (or second to last) interceptors applied in a stack, as it assumes that all values have
* already been set on the action.
*
* <p/>This interceptor does nothing if the name of the method being invoked is specified in the <b>excludeMethods</b>
* parameter. <b>excludeMethods</b> accepts a comma-delimited list of method names. For example, requests to
* <b>foo!input.action</b> and <b>foo!back.action</b> will be skipped by this interceptor if you set the
* <b>excludeMethods</b> parameter to "input, back".
*
* </ol>
*
* <p/> The workflow of the action request does not change due to this interceptor. Rather,
* this interceptor is often used in conjuction with the <b>workflow</b> interceptor.
*
* <p/>
*
* <b>NOTE:</b> As this method extends off MethodFilterInterceptor, it is capable of
* deciding if it is applicable only to selective methods in the action class. See
* <code>MethodFilterInterceptor</code> for more info.
*
* <!-- END SNIPPET: description -->
*
* <p/> <u>Interceptor parameters:</u>
*
* <!-- START SNIPPET: parameters -->
*
* <ul>
*
* <li>alwaysInvokeValidate - Defaults to true. If true validate() method will always
* be invoked, otherwise it will not.</li>
*
* <li>programmatic - Defaults to true. If true and the action is Validateable call validate(),
* and any method that starts with "validate".
* </li>
*
* <li>declarative - Defaults to true. Perform validation based on xml or annotations.</li>
*
* </ul>
*
* <!-- END SNIPPET: parameters -->
*
* <p/> <u>Extending the interceptor:</u>
*
* <p/>
*
* <!-- START SNIPPET: extending -->
*
* There are no known extension points for this interceptor.
*
* <!-- END SNIPPET: extending -->
*
* <p/> <u>Example code:</u>
*
* <pre>
* <!-- START SNIPPET: example -->
*
* <action name="someAction" class="com.examples.SomeAction">
* <interceptor-ref name="params"/>
* <interceptor-ref name="validation"/>
* <interceptor-ref name="workflow"/>
* <result name="success">good_result.ftl</result>
* </action>
*
* <-- in the following case myMethod of the action class will not
* get validated -->
* <action name="someAction" class="com.examples.SomeAction">
* <interceptor-ref name="params"/>
* <interceptor-ref name="validation">
* <param name="excludeMethods">myMethod</param>
* </interceptor-ref>
* <interceptor-ref name="workflow"/>
* <result name="success">good_result.ftl</result>
* </action>
*
* <-- in the following case only annotated methods of the action class will
* be validated -->
* <action name="someAction" class="com.examples.SomeAction">
* <interceptor-ref name="params"/>
* <interceptor-ref name="validation">
* <param name="validateAnnotatedMethodOnly">true</param>
* </interceptor-ref>
* <interceptor-ref name="workflow"/>
* <result name="success">good_result.ftl</result>
* </action>
*
*
* <!-- END SNIPPET: example -->
* </pre>
*
* @author Jason Carreira
* @author Rainer Hermanns
* @author <a href='mailto:the_mindstorm[at]evolva[dot]ro'>Alexandru Popescu</a>
* @see ActionValidatorManager
* @see com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor
*/
public class ValidationInterceptor extends MethodFilterInterceptor {
private boolean validateAnnotatedMethodOnly;
private ActionValidatorManager actionValidatorManager;
private static final Logger LOG = LoggerFactory.getLogger(ValidationInterceptor.class);
private final static String VALIDATE_PREFIX = "validate";
private final static String ALT_VALIDATE_PREFIX = "validateDo";
private boolean alwaysInvokeValidate = true;
private boolean programmatic = true;
private boolean declarative = true;
@Inject
public void setActionValidatorManager(ActionValidatorManager mgr) {
this.actionValidatorManager = mgr;
}
/**
* Determines if {@link Validateable}'s <code>validate()</code> should be called,
* as well as methods whose name that start with "validate". Defaults to "true".
*
* @param programmatic <tt>true</tt> then <code>validate()</code> is invoked.
*/
public void setProgrammatic(boolean programmatic) {
this.programmatic = programmatic;
}
/**
* Determines if validation based on annotations or xml should be performed. Defaults
* to "true".
*
* @param declarative <tt>true</tt> then perform validation based on annotations or xml.
*/
public void setDeclarative(boolean declarative) {
this.declarative = declarative;
}
/**
* Determines if {@link Validateable}'s <code>validate()</code> should always
* be invoked. Default to "true".
*
* @param alwaysInvokeValidate <tt>true</tt> then <code>validate()</code> is always invoked.
*/
public void setAlwaysInvokeValidate(String alwaysInvokeValidate) {
this.alwaysInvokeValidate = Boolean.parseBoolean(alwaysInvokeValidate);
}
/**
* Gets if <code>validate()</code> should always be called or only per annotated method.
*
* @return <tt>true</tt> to only validate per annotated method, otherwise <tt>false</tt> to always validate.
*/
public boolean isValidateAnnotatedMethodOnly() {
return validateAnnotatedMethodOnly;
}
/**
* Determine if <code>validate()</code> should always be called or only per annotated method.
* Default to <tt>false</tt>.
*
* @param validateAnnotatedMethodOnly <tt>true</tt> to only validate per annotated method, otherwise <tt>false</tt> to always validate.
*/
public void setValidateAnnotatedMethodOnly(boolean validateAnnotatedMethodOnly) {
this.validateAnnotatedMethodOnly = validateAnnotatedMethodOnly;
}
/**
* Gets the current action and its context and delegates to {@link ActionValidatorManager} proper validate method.
*
* @param invocation the execution state of the Action.
* @throws Exception if an error occurs validating the action.
*/
protected void doBeforeInvocation(ActionInvocation invocation) throws Exception {
Object action = invocation.getAction();
ActionProxy proxy = invocation.getProxy();
//the action name has to be from the url, otherwise validators that use aliases, like
//MyActio-someaction-validator.xml will not be found, see WW-3194
String context = proxy.getActionName();
String method = proxy.getMethod();
if (log.isDebugEnabled()) {
log.debug("Validating "
+ invocation.getProxy().getNamespace() + "/" + invocation.getProxy().getActionName() + " with method "+ method +".");
}
if (declarative) {
if (validateAnnotatedMethodOnly) {
actionValidatorManager.validate(action, context, method);
} else {
actionValidatorManager.validate(action, context);
}
}
if (action instanceof Validateable && programmatic) {
// keep exception that might occured in validateXXX or validateDoXXX
Exception exception = null;
Validateable validateable = (Validateable) action;
if (LOG.isDebugEnabled()) {
LOG.debug("Invoking validate() on action "+validateable);
}
try {
PrefixMethodInvocationUtil.invokePrefixMethod(
invocation,
new String[] { VALIDATE_PREFIX, ALT_VALIDATE_PREFIX });
}
catch(Exception e) {
// If any exception occurred while doing reflection, we want
// validate() to be executed
if (LOG.isWarnEnabled()) {
LOG.warn("an exception occured while executing the prefix method", e);
}
exception = e;
}
if (alwaysInvokeValidate) {
validateable.validate();
}
if (exception != null) {
// rethrow if something is wrong while doing validateXXX / validateDoXXX
throw exception;
}
}
}
@Override
protected String doIntercept(ActionInvocation invocation) throws Exception {
doBeforeInvocation(invocation);
return invocation.invoke();
}
}