Source Code Cross Referenced for AbstractWidgetDefinitionBuilder.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » forms » formmodel » 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.formmodel 
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.formmodel;
018:
019:        import java.util.ArrayList;
020:        import java.util.Collections;
021:        import java.util.HashMap;
022:        import java.util.Iterator;
023:        import java.util.List;
024:        import java.util.Map;
025:
026:        import org.apache.avalon.framework.activity.Disposable;
027:        import org.apache.avalon.framework.service.ServiceException;
028:        import org.apache.avalon.framework.service.ServiceManager;
029:        import org.apache.avalon.framework.service.ServiceSelector;
030:        import org.apache.avalon.framework.service.Serviceable;
031:        import org.apache.excalibur.xml.sax.XMLizable;
032:
033:        import org.apache.cocoon.forms.FormsConstants;
034:        import org.apache.cocoon.forms.FormsException;
035:        import org.apache.cocoon.forms.datatype.DatatypeManager;
036:        import org.apache.cocoon.forms.event.CreateListener;
037:        import org.apache.cocoon.forms.event.WidgetListener;
038:        import org.apache.cocoon.forms.event.WidgetListenerBuilder;
039:        import org.apache.cocoon.forms.expression.ExpressionManager;
040:        import org.apache.cocoon.forms.util.DomHelper;
041:        import org.apache.cocoon.forms.validation.WidgetValidatorBuilder;
042:
043:        import org.w3c.dom.Element;
044:        import org.w3c.dom.Node;
045:        import org.w3c.dom.NodeList;
046:
047:        /**
048:         * Abstract base class for WidgetDefinitionBuilders. Provides functionality
049:         * common to many implementations.
050:         *
051:         * @version $Id: AbstractWidgetDefinitionBuilder.java 450088 2006-09-26 15:36:34Z jbq $
052:         */
053:        public abstract class AbstractWidgetDefinitionBuilder implements 
054:                WidgetDefinitionBuilder, Serviceable, Disposable {
055:
056:            protected ServiceSelector widgetDefinitionBuilderSelector;
057:            protected ServiceSelector widgetValidatorBuilderSelector;
058:            protected ServiceSelector widgetListenerBuilderSelector;
059:            protected DatatypeManager datatypeManager;
060:            protected ExpressionManager expressionManager;
061:            protected ServiceManager serviceManager;
062:
063:            protected WidgetDefinitionBuilderContext context;
064:
065:            public void service(ServiceManager serviceManager)
066:                    throws ServiceException {
067:                this .serviceManager = serviceManager;
068:                this .widgetDefinitionBuilderSelector = (ServiceSelector) serviceManager
069:                        .lookup(WidgetDefinitionBuilder.class.getName()
070:                                + "Selector");
071:                this .datatypeManager = (DatatypeManager) serviceManager
072:                        .lookup(DatatypeManager.ROLE);
073:                this .expressionManager = (ExpressionManager) serviceManager
074:                        .lookup(ExpressionManager.ROLE);
075:                this .widgetValidatorBuilderSelector = (ServiceSelector) serviceManager
076:                        .lookup(WidgetValidatorBuilder.ROLE + "Selector");
077:                this .widgetListenerBuilderSelector = (ServiceSelector) serviceManager
078:                        .lookup(WidgetListenerBuilder.ROLE + "Selector");
079:            }
080:
081:            public void dispose() {
082:                this .serviceManager
083:                        .release(this .widgetDefinitionBuilderSelector);
084:                this .widgetDefinitionBuilderSelector = null;
085:                this .serviceManager.release(this .datatypeManager);
086:                this .datatypeManager = null;
087:                this .serviceManager.release(this .expressionManager);
088:                this .expressionManager = null;
089:                this .serviceManager
090:                        .release(this .widgetValidatorBuilderSelector);
091:                this .widgetValidatorBuilderSelector = null;
092:                this .serviceManager = null;
093:            }
094:
095:            public WidgetDefinition buildWidgetDefinition(
096:                    Element widgetElement,
097:                    WidgetDefinitionBuilderContext context) throws Exception {
098:                // so changes don't pollute upper levels
099:                this .context = new WidgetDefinitionBuilderContext(context);
100:
101:                WidgetDefinition def = buildWidgetDefinition(widgetElement);
102:
103:                // register this class with the local library, if any.
104:                if (DomHelper.getAttributeAsBoolean(widgetElement, "register",
105:                        false)
106:                        && this .context != null
107:                        && this .context.getLocalLibrary() != null) {
108:                    this .context.getLocalLibrary().addDefinition(def);
109:                }
110:
111:                this .context = null;
112:                return def;
113:            }
114:
115:            protected void setupDefinition(Element widgetElement,
116:                    AbstractWidgetDefinition definition) throws Exception {
117:                // location
118:                definition.setLocation(DomHelper
119:                        .getLocationObject(widgetElement));
120:
121:                if (this .context.getSuperDefinition() != null) {
122:                    definition
123:                            .initializeFrom(this .context.getSuperDefinition());
124:                }
125:
126:                setCommonProperties(widgetElement, definition);
127:                setValidators(widgetElement, definition);
128:                setCreateListeners(widgetElement, definition);
129:            }
130:
131:            protected void setCommonProperties(Element widgetElement,
132:                    AbstractWidgetDefinition widgetDefinition) throws Exception {
133:
134:                // id
135:                if (widgetDefinition instanceof  FormDefinition) {
136:                    // FormDefinition is the *only* kind of widget that has an optional id
137:                    widgetDefinition.setId(DomHelper.getAttribute(
138:                            widgetElement, "id", ""));
139:                } else {
140:                    String id = DomHelper.getAttribute(widgetElement, "id");
141:                    if (id.indexOf('/') != -1 || id.indexOf('.') != -1) {
142:                        throw new FormsException(
143:                                "A widget name cannot contain '.' or '/' as this conflicts with widget paths.",
144:                                DomHelper.getLocationObject(widgetElement));
145:                    }
146:                    // NewDefinitions are allowed to have a : in their id because they can look up
147:                    // class widgets from the library directly
148:                    if (id.indexOf(':') != -1
149:                            && !(widgetDefinition instanceof  NewDefinition)) {
150:                        throw new FormsException(
151:                                "A widget name cannot contain ':' as this conflicts with library prefixes",
152:                                DomHelper.getLocationObject(widgetElement));
153:                    }
154:                    widgetDefinition.setId(id);
155:                }
156:
157:                // state
158:                String stateValue = DomHelper.getAttribute(widgetElement,
159:                        "state", null);
160:                if (stateValue != null) {
161:                    WidgetState state = WidgetState.stateForName(stateValue);
162:                    if (state == null) {
163:                        throw new FormsException("Unknown value '" + stateValue
164:                                + "' for state attribute.", DomHelper
165:                                .getLocationObject(widgetElement));
166:                    }
167:                    widgetDefinition.setState(state);
168:                }
169:
170:                // attributes
171:                Element attrContainer = DomHelper.getChildElement(
172:                        widgetElement, FormsConstants.DEFINITION_NS,
173:                        "attributes", false);
174:                if (attrContainer != null) {
175:                    // There's a <fd:attributes> element. Get its <fd:attribute> children
176:                    Element[] attrs = DomHelper.getChildElements(attrContainer,
177:                            FormsConstants.DEFINITION_NS, "attribute");
178:                    if (attrs != null && attrs.length > 0) {
179:                        // We actually do have some
180:                        Map attrMap = new HashMap();
181:                        for (int i = 0; i < attrs.length; i++) {
182:                            attrMap.put(DomHelper
183:                                    .getAttribute(attrs[i], "name"), DomHelper
184:                                    .getAttribute(attrs[i], "value"));
185:                        }
186:                        widgetDefinition.setAttributes(attrMap);
187:                    }
188:                }
189:            }
190:
191:            protected WidgetDefinition buildAnotherWidgetDefinition(
192:                    Element widgetDefinition) throws Exception {
193:                String widgetName = widgetDefinition.getLocalName();
194:                WidgetDefinitionBuilder builder;
195:                try {
196:                    builder = (WidgetDefinitionBuilder) widgetDefinitionBuilderSelector
197:                            .select(widgetName);
198:                } catch (ServiceException e) {
199:                    throw new FormsException("Unknown kind of widget '"
200:                            + widgetName + "'.", e, DomHelper
201:                            .getLocationObject(widgetDefinition));
202:                }
203:
204:                return builder.buildWidgetDefinition(widgetDefinition,
205:                        this .context);
206:            }
207:
208:            protected List buildEventListeners(Element widgetElement,
209:                    String elementName, Class listenerClass) throws Exception {
210:                List result = null;
211:                Element listenersElement = DomHelper.getChildElement(
212:                        widgetElement, FormsConstants.DEFINITION_NS,
213:                        elementName);
214:                if (listenersElement != null) {
215:                    NodeList list = listenersElement.getChildNodes();
216:                    for (int i = 0; i < list.getLength(); i++) {
217:                        if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
218:                            Element listenerElement = (Element) list.item(i);
219:                            WidgetListenerBuilder builder;
220:                            try {
221:                                builder = (WidgetListenerBuilder) widgetListenerBuilderSelector
222:                                        .select(listenerElement.getLocalName());
223:                            } catch (ServiceException e) {
224:                                throw new FormsException(
225:                                        "Unknown kind of eventlistener '"
226:                                                + listenerElement
227:                                                        .getLocalName() + "'.",
228:                                        e,
229:                                        DomHelper
230:                                                .getLocationObject(listenerElement));
231:                            }
232:                            WidgetListener listener = builder.buildListener(
233:                                    listenerElement, listenerClass);
234:                            widgetListenerBuilderSelector.release(builder);
235:                            if (result == null) {
236:                                result = new ArrayList();
237:                            }
238:                            result.add(listener);
239:                        }
240:                    }
241:                }
242:
243:                return result == null ? Collections.EMPTY_LIST : result;
244:            }
245:
246:            protected void setDisplayData(Element widgetElement,
247:                    AbstractWidgetDefinition widgetDefinition) throws Exception {
248:                final String[] names = { "label", "help", "hint" };
249:                Map displayData = new HashMap(names.length);
250:                for (int i = 0; i < names.length; i++) {
251:                    XMLizable data = null;
252:                    Element dataElement = DomHelper.getChildElement(
253:                            widgetElement, FormsConstants.DEFINITION_NS,
254:                            names[i]);
255:                    if (dataElement != null) {
256:                        data = DomHelper.compileElementContent(dataElement);
257:                    }
258:
259:                    // NOTE: We put also null values in the may in order to test their existence
260:                    //       (see AbstractWidgetDefinition.generateDisplayData)
261:                    displayData.put(names[i], data);
262:                }
263:
264:                widgetDefinition.setDisplayData(displayData);
265:            }
266:
267:            protected void setValidators(Element widgetElement,
268:                    AbstractWidgetDefinition widgetDefinition) throws Exception {
269:                Element validatorElement = DomHelper.getChildElement(
270:                        widgetElement, FormsConstants.DEFINITION_NS,
271:                        "validation");
272:                if (validatorElement != null) {
273:                    NodeList list = validatorElement.getChildNodes();
274:                    for (int i = 0; i < list.getLength(); i++) {
275:                        if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
276:                            Element element = (Element) list.item(i);
277:                            String name = element.getLocalName();
278:                            WidgetValidatorBuilder builder;
279:                            try {
280:                                builder = (WidgetValidatorBuilder) this .widgetValidatorBuilderSelector
281:                                        .select(name);
282:                            } catch (ServiceException e) {
283:                                throw new FormsException(
284:                                        "Unknown kind of validator '" + name
285:                                                + "'.", e, DomHelper
286:                                                .getLocationObject(element));
287:                            }
288:
289:                            widgetDefinition.addValidator(builder.build(
290:                                    element, widgetDefinition));
291:                            widgetValidatorBuilderSelector.release(builder);
292:                        }
293:                    }
294:                }
295:            }
296:
297:            protected void setCreateListeners(Element widgetElement,
298:                    AbstractWidgetDefinition widgetDefinition) throws Exception {
299:                Iterator i = buildEventListeners(widgetElement, "on-create",
300:                        CreateListener.class).iterator();
301:                while (i.hasNext()) {
302:                    widgetDefinition.addCreateListener((CreateListener) i
303:                            .next());
304:                }
305:            }
306:        }
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