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Struts example source code file (DefaultActionValidatorManager.java)

This example Struts source code file (DefaultActionValidatorManager.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

arraylist, arraylist, class, collection, fieldvalidator, io, list, list, short-circuiting, string, string, util, validation_config_suffix, validationexception, validatorcontext, validatorcontext

The Struts DefaultActionValidatorManager.java source code

/*
 * 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.ActionContext;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.FileManager;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import com.opensymphony.xwork2.validator.validators.VisitorFieldValidator;

import java.io.IOException;
import java.io.InputStream;
import java.util.*;


/**
 * This is the entry point into XWork's rule-based validation framework.
 * <p/>
 * Validation rules are specified in XML configuration files named <code>className-contextName-validation.xml where
 * className is the name of the class the configuration is for and -contextName is optional
 * (contextName is an arbitrary key that is used to look up additional validation rules for a
 * specific context).
 *
 * @author Jason Carreira
 * @author Mark Woon
 * @author James House
 * @author Rainer Hermanns
 */
public class DefaultActionValidatorManager implements ActionValidatorManager {

    /** The file suffix for any validation file. */
    protected static final String VALIDATION_CONFIG_SUFFIX = "-validation.xml";

    private final Map<String, List validatorCache = Collections.synchronizedMap(new HashMap>());
    private final Map<String, List validatorFileCache = Collections.synchronizedMap(new HashMap>());
    private final Logger LOG = LoggerFactory.getLogger(DefaultActionValidatorManager.class);
    private ValidatorFactory validatorFactory;
    private ValidatorFileParser validatorFileParser;

    @Inject
    public void setValidatorFileParser(ValidatorFileParser parser) {
        this.validatorFileParser = parser;
    }
    
    @Inject
    public void setValidatorFactory(ValidatorFactory fac) {
        this.validatorFactory = fac;
    }

    public synchronized List<Validator> getValidators(Class clazz, String context) {
        return getValidators(clazz, context, null);
    }

    public synchronized List<Validator> getValidators(Class clazz, String context, String method) {
        final String validatorKey = buildValidatorKey(clazz, context);

        if (validatorCache.containsKey(validatorKey)) {
            if (FileManager.isReloadingConfigs()) {
                validatorCache.put(validatorKey, buildValidatorConfigs(clazz, context, true, null));
            }
        } else {
            validatorCache.put(validatorKey, buildValidatorConfigs(clazz, context, false, null));
        }
        ValueStack stack = ActionContext.getContext().getValueStack();

        // get the set of validator configs
        List<ValidatorConfig> cfgs = validatorCache.get(validatorKey);

        // create clean instances of the validators for the caller's use
        ArrayList<Validator> validators = new ArrayList(cfgs.size());
        for (ValidatorConfig cfg : cfgs) {
            if (method == null || method.equals(cfg.getParams().get("methodName"))) {
                Validator validator = validatorFactory.getValidator(cfg);
                validator.setValidatorType(cfg.getType());
                validator.setValueStack(stack);
                validators.add(validator);
            }
        }
        return validators;
    }

    public void validate(Object object, String context) throws ValidationException {
        validate(object, context, (String) null);
    }

    public void validate(Object object, String context, String method) throws ValidationException {
        ValidatorContext validatorContext = new DelegatingValidatorContext(object);
        validate(object, context, validatorContext, method);
    }

    public void validate(Object object, String context, ValidatorContext validatorContext) throws ValidationException {
        validate(object, context, validatorContext, null);
    }

    public void validate(Object object, String context, ValidatorContext validatorContext, String method) throws ValidationException {
        List<Validator> validators = getValidators(object.getClass(), context, method);
        Set<String> shortcircuitedFields = null;

        for (final Validator validator : validators) {
        try {
                validator.setValidatorContext(validatorContext);

                if (LOG.isDebugEnabled()) {
                    LOG.debug("Running validator: " + validator + " for object " + object + " and method " + method);
                }

                FieldValidator fValidator = null;
                String fullFieldName = null;

                if (validator instanceof FieldValidator) {
                    fValidator = (FieldValidator) validator;
                    fullFieldName = new InternalValidatorContextWrapper(fValidator.getValidatorContext()).getFullFieldName(fValidator.getFieldName());

                    // This is pretty crap, but needed to support short-circuited validations on nested visited objects
                    if (validatorContext instanceof VisitorFieldValidator.AppendingValidatorContext) {
                        VisitorFieldValidator.AppendingValidatorContext appendingValidatorContext =
                                (VisitorFieldValidator.AppendingValidatorContext) validatorContext;
                        fullFieldName = appendingValidatorContext.getFullFieldNameFromParent(fValidator.getFieldName());
                    }

                    if ((shortcircuitedFields != null) && shortcircuitedFields.contains(fullFieldName)) {
                        if (LOG.isDebugEnabled()) {
                            LOG.debug("Short-circuited, skipping");
                        }

                        continue;
                    }
                }

                if (validator instanceof ShortCircuitableValidator && ((ShortCircuitableValidator) validator).isShortCircuit()) {
                    // get number of existing errors
                    List<String> errs = null;

                    if (fValidator != null) {
                        if (validatorContext.hasFieldErrors()) {
                            Collection<String> fieldErrors = validatorContext.getFieldErrors().get(fullFieldName);

                            if (fieldErrors != null) {
                                errs = new ArrayList<String>(fieldErrors);
                            }
                        }
                    } else if (validatorContext.hasActionErrors()) {
                        Collection<String> actionErrors = validatorContext.getActionErrors();

                        if (actionErrors != null) {
                            errs = new ArrayList<String>(actionErrors);
                        }
                    }

                    validator.validate(object);

                    if (fValidator != null) {
                        if (validatorContext.hasFieldErrors()) {
                            Collection<String> errCol = validatorContext.getFieldErrors().get(fullFieldName);

                            if ((errCol != null) && !errCol.equals(errs)) {
                                if (LOG.isDebugEnabled()) {
                                    LOG.debug("Short-circuiting on field validation");
                                }

                                if (shortcircuitedFields == null) {
                                    shortcircuitedFields = new TreeSet<String>();
                                }

                                shortcircuitedFields.add(fullFieldName);
                            }
                        }
                    } else if (validatorContext.hasActionErrors()) {
                        Collection<String> errCol = validatorContext.getActionErrors();

                        if ((errCol != null) && !errCol.equals(errs)) {
                            if (LOG.isDebugEnabled()) {
                                LOG.debug("Short-circuiting");
                            }

                            break;
                        }
                    }

                    continue;
                }

                validator.validate(object);
            }
            finally {
                validator.setValidatorContext(null);
            }
        }
    }

    /**
     * Builds a key for validators - used when caching validators.
     *
     * @param clazz the action.
     * @param context the action's context.
     * @return a validator key which is the class name plus context.
     */
    protected static String buildValidatorKey(Class clazz, String context) {
        StringBuilder sb = new StringBuilder(clazz.getName());
        sb.append("/");
        sb.append(context);
        return sb.toString();
    }

    private List<ValidatorConfig> buildAliasValidatorConfigs(Class aClass, String context, boolean checkFile) {
        String fileName = aClass.getName().replace('.', '/') + "-" + context + VALIDATION_CONFIG_SUFFIX;

        return loadFile(fileName, aClass, checkFile);
    }

    private List<ValidatorConfig> buildClassValidatorConfigs(Class aClass, boolean checkFile) {
        String fileName = aClass.getName().replace('.', '/') + VALIDATION_CONFIG_SUFFIX;

        return loadFile(fileName, aClass, checkFile);
    }

    /**
     * <p>This method 'collects' all the validator configurations for a given
     * action invocation.</p>
     *
     * <p>It will traverse up the class hierarchy looking for validators for every super class
     * and directly implemented interface of the current action, as well as adding validators for
     * any alias of this invocation. Nifty!</p>
     *
     * <p>Given the following class structure:
     * <pre>
     *   interface Thing;
     *   interface Animal extends Thing;
     *   interface Quadraped extends Animal;
     *   class AnimalImpl implements Animal;
     *   class QuadrapedImpl extends AnimalImpl implements Quadraped;
     *   class Dog extends QuadrapedImpl;
     * </pre>

* * <p>This method will look for the following config files for Dog: * <pre> * Animal * Animal-context * AnimalImpl * AnimalImpl-context * Quadraped * Quadraped-context * QuadrapedImpl * QuadrapedImpl-context * Dog * Dog-context * </pre>

* * <p>Note that the validation rules for Thing is never looked for because no class in the * hierarchy directly implements Thing.</p> * * @param clazz the Class to look up validators for. * @param context the context to use when looking up validators. * @param checkFile true if the validation config file should be checked to see if it has been * updated. * @param checked the set of previously checked class-contexts, null if none have been checked * @return a list of validator configs for the given class and context. */ private List<ValidatorConfig> buildValidatorConfigs(Class clazz, String context, boolean checkFile, Set checked) { List<ValidatorConfig> validatorConfigs = new ArrayList(); if (checked == null) { checked = new TreeSet<String>(); } else if (checked.contains(clazz.getName())) { return validatorConfigs; } if (clazz.isInterface()) { for (Class anInterface : clazz.getInterfaces()) { validatorConfigs.addAll(buildValidatorConfigs(anInterface, context, checkFile, checked)); } } else { if (!clazz.equals(Object.class)) { validatorConfigs.addAll(buildValidatorConfigs(clazz.getSuperclass(), context, checkFile, checked)); } } // look for validators for implemented interfaces for (Class anInterface1 : clazz.getInterfaces()) { if (checked.contains(anInterface1.getName())) { continue; } validatorConfigs.addAll(buildClassValidatorConfigs(anInterface1, checkFile)); if (context != null) { validatorConfigs.addAll(buildAliasValidatorConfigs(anInterface1, context, checkFile)); } checked.add(anInterface1.getName()); } validatorConfigs.addAll(buildClassValidatorConfigs(clazz, checkFile)); if (context != null) { validatorConfigs.addAll(buildAliasValidatorConfigs(clazz, context, checkFile)); } checked.add(clazz.getName()); return validatorConfigs; } private List<ValidatorConfig> loadFile(String fileName, Class clazz, boolean checkFile) { List<ValidatorConfig> retList = Collections.emptyList(); if ((checkFile && FileManager.fileNeedsReloading(fileName, clazz)) || !validatorFileCache.containsKey(fileName)) { InputStream is = null; try { is = FileManager.loadFile(fileName, clazz); if (is != null) { retList = new ArrayList<ValidatorConfig>(validatorFileParser.parseActionValidatorConfigs(validatorFactory, is, fileName)); } } finally { if (is != null) { try { is.close(); } catch (IOException e) { LOG.error("Unable to close input stream for " + fileName, e); } } } validatorFileCache.put(fileName, retList); } else { retList = validatorFileCache.get(fileName); } return retList; } /** * An {@link com.opensymphony.xwork2.validator.ValidatorContext} wrapper that * returns the full field name * {@link InternalValidatorContextWrapper#getFullFieldName(String)} * by consulting it's parent if its an {@link com.opensymphony.xwork2.validator.validators.VisitorFieldValidator.AppendingValidatorContext}. * <p/> * Eg. if we have nested Visitor * AddressVisitor nested inside PersonVisitor, when using the normal #getFullFieldName, we will get * "address.somefield", we lost the parent, with this wrapper, we will get "person.address.somefield". * This is so that the key is used to register errors, so that we don't screw up short-curcuit feature * when using nested visitor. See XW-571 (nested visitor validators break short-circuit functionality) * at http://jira.opensymphony.com/browse/XW-571 */ protected class InternalValidatorContextWrapper { private ValidatorContext validatorContext = null; InternalValidatorContextWrapper(ValidatorContext validatorContext) { this.validatorContext = validatorContext; } /** * Get the full field name by consulting the parent, so that when we are using nested visitors ( * visitor nested inside visitor etc.) we still get the full field name including its parents. * See XW-571 for more details. * @param field The field name * @return String */ public String getFullFieldName(String field) { if (validatorContext instanceof VisitorFieldValidator.AppendingValidatorContext) { VisitorFieldValidator.AppendingValidatorContext appendingValidatorContext = (VisitorFieldValidator.AppendingValidatorContext) validatorContext; return appendingValidatorContext.getFullFieldNameFromParent(field); } return validatorContext.getFullFieldName(field); } } }

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