org.apache.beehive.netui.pageflow.validation.ValidatorRules.java Source code

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Here is the source code for org.apache.beehive.netui.pageflow.validation.ValidatorRules.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 *
 * $Header:$
 */
package org.apache.beehive.netui.pageflow.validation;

import org.apache.commons.validator.ValidatorAction;
import org.apache.commons.validator.Field;
import org.apache.commons.validator.ValidatorUtil;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.validator.Resources;
import org.apache.struts.validator.FieldChecks;
import org.apache.beehive.netui.pageflow.internal.InternalExpressionUtils;
import org.apache.beehive.netui.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.ServletContext;

public class ValidatorRules extends FieldChecks {
    private static final Logger _log = Logger.getInstance(ValidatorRules.class);

    /**
     * Check if a given expression evaluates to <code>true</code>.
     * 
     * @param bean the bean that validation is being performed on.
     * @param va the <code>ValidatorAction</code> that is currently being performed.
     * @param field the <code>Field</code> object associated with the current field being validated.
     * @param errors the <code>ActionMessages</code> object to add errors to if any validation errors occur.
     * @param request the current request object.
     * @return <code>true</code> if the given expression evaluates to <code>true</code>
     */
    public static boolean validateValidWhen(Object bean, ValidatorAction va, Field field, ActionMessages errors,
            HttpServletRequest request, ServletContext servletContext) {

        String value;

        if (isString(bean)) {
            value = (String) bean;
        } else {
            value = ValidatorUtil.getValueAsString(bean, field.getProperty());
        }

        if (!GenericValidator.isBlankOrNull(value)) {
            String condition = field.getVarValue("netui_validwhen");

            try {
                if (!InternalExpressionUtils.evaluateCondition(condition, bean, request, servletContext)) {
                    errors.add(field.getKey(), Resources.getActionError(request, va, field));
                    return false;
                }
            } catch (Exception e) {
                _log.error("Error evaluating expression " + condition + " for ValidWhen rule on field "
                        + field.getProperty() + " on bean of type "
                        + (bean != null ? bean.getClass().getName() : null));

                errors.add(field.getKey(), Resources.getActionError(request, va, field));
                return false;
            }
        }

        return true;
    }

    /**
     * Check if a field's value is within a range ("min" and "max" Long variables on the passed-in Field).
     *
     * @param bean the bean that validation is being performed on.
     * @param va the <code>ValidatorAction</code> that is currently being performed.
     * @param field the <code>Field</code> object associated with the current field being validated.
     * @param errors the <code>ActionMessages</code> object to add errors to if any validation errors occur.
     * @param request the current request object.
     * @return <code>true</code> if in range, false otherwise.
     */
    public static boolean validateLongRange(Object bean, ValidatorAction va, Field field, ActionMessages errors,
            HttpServletRequest request) {

        String value;

        if (isString(bean)) {
            value = (String) bean;
        } else {
            value = ValidatorUtil.getValueAsString(bean, field.getProperty());
        }

        if (!GenericValidator.isBlankOrNull(value)) {
            try {
                long longValue = Long.parseLong(value);
                long min = Long.parseLong(field.getVarValue("min"));
                long max = Long.parseLong(field.getVarValue("max"));

                if (longValue < min || longValue > max) {
                    errors.add(field.getKey(), Resources.getActionError(request, va, field));
                    return false;
                }
            } catch (Exception e) {
                errors.add(field.getKey(), Resources.getActionError(request, va, field));
                return false;
            }
        }

        return true;
    }
}