Source Code Cross Referenced for JavaScriptValidator.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » forms » validation » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.forms.validation.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.forms.validation.impl;
018:
019:        import java.util.Map;
020:
021:        import org.apache.avalon.framework.CascadingRuntimeException;
022:        import org.apache.avalon.framework.context.Context;
023:        import org.apache.cocoon.components.ContextHelper;
024:        import org.apache.cocoon.forms.formmodel.Widget;
025:        import org.apache.cocoon.forms.util.JavaScriptHelper;
026:        import org.apache.cocoon.forms.validation.ValidationError;
027:        import org.apache.cocoon.forms.validation.ValidationErrorAware;
028:        import org.apache.cocoon.forms.validation.WidgetValidator;
029:        import org.apache.excalibur.xml.sax.XMLizable;
030:        import org.mozilla.javascript.Function;
031:
032:        /**
033:         * A {@link org.apache.cocoon.forms.validation.WidgetValidator} implemented as a JavaScript snippet.
034:         * <p>
035:         * This snippet must return a value which can be of different types. The only way to indicate
036:         * successfull validation is to return a boolean <code>true</code> value.
037:         * <p>
038:         * To indicate validation error, a number of result types are possible:
039:         * <ul>
040:         * <li>A boolean <code>false</code>: the validator <strong>must</strong> then have
041:         *     set a validation error on the validated widget or one of its children.</li>
042:         * <li>A {@link ValidationError}: this error is then set on the validated widget.</li>
043:         * <li>A <code>String</code>: a validation error using that string as a non-i18nized message is
044:         *     then set on the validated widget</li>
045:         * <li>An <code>XMLizable</code> such as {@link org.apache.cocoon.forms.util.I18nMessage}: this
046:         *     xmlizable is used to build a validation error that is set on the validated widget.</li>
047:         * </ul>
048:         * <p>
049:         * The JavaScript snippet has the "this" and "widget" variables set to the validated widget, and, if the form
050:         * is used in a flowscript, can use the flow's global values and fonctions and the <code>cocoon</code> object.
051:         * 
052:         * @version $Id: JavaScriptValidator.java 449149 2006-09-23 03:58:05Z crossley $
053:         */
054:        public class JavaScriptValidator implements  WidgetValidator {
055:
056:            private final Function function;
057:            private final Context avalonContext;
058:
059:            public JavaScriptValidator(Context context, Function function) {
060:                this .function = function;
061:                this .avalonContext = context;
062:            }
063:
064:            public final boolean validate(Widget widget) {
065:
066:                Map objectModel = ContextHelper
067:                        .getObjectModel(this .avalonContext);
068:
069:                Object result;
070:
071:                try {
072:                    result = JavaScriptHelper.callFunction(this .function,
073:                            widget, new Object[] { widget }, objectModel);
074:                } catch (RuntimeException re) {
075:                    throw re; // rethrow
076:                } catch (Exception e) {
077:                    throw new CascadingRuntimeException(
078:                            "Error invoking JavaScript event handler", e);
079:                }
080:
081:                if (result == null) {
082:                    throw new RuntimeException(
083:                            "Validation script did not return a value");
084:                }
085:
086:                if (result instanceof  Boolean) {
087:                    return ((Boolean) result).booleanValue();
088:                }
089:
090:                if (result instanceof  ValidationError) {
091:                    // Set the validation error on the widget
092:                    ((ValidationErrorAware) widget)
093:                            .setValidationError((ValidationError) result);
094:                    return false;
095:                }
096:
097:                if (result instanceof  String) {
098:                    // Set a non-i18n error on the current widget
099:                    ((ValidationErrorAware) widget)
100:                            .setValidationError(new ValidationError(
101:                                    (String) result, false));
102:                    return false;
103:                }
104:
105:                if (result instanceof  XMLizable) {
106:                    // Set a xmlizable error (e.g. I18nMessage) on the current widget
107:                    ((ValidationErrorAware) widget)
108:                            .setValidationError(new ValidationError(
109:                                    (XMLizable) result));
110:                    return false;
111:                }
112:
113:                throw new RuntimeException(
114:                        "Validation script returned an unexpected value of type "
115:                                + result.getClass());
116:            }
117:        }
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