/*
* Copyright 1999-2004 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 org.apache.cocoon.woody.formmodel;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.avalon.framework.CascadingException;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.ServiceSelector;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.cocoon.woody.Constants;
import org.apache.cocoon.woody.datatype.DatatypeManager;
import org.apache.cocoon.woody.event.WidgetListener;
import org.apache.cocoon.woody.event.WidgetListenerBuilderUtil;
import org.apache.cocoon.woody.expression.ExpressionManager;
import org.apache.cocoon.woody.util.DomHelper;
import org.apache.cocoon.woody.validation.WidgetValidatorBuilder;
import org.apache.excalibur.xml.sax.XMLizable;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Abstract base class for WidgetDefinitionBuilders. Provides functionality
* common to many implementations.
*
* @version $Id: AbstractWidgetDefinitionBuilder.java,v 1.15 2004/03/09 13:53:56 reinhard Exp $
*/
public abstract class AbstractWidgetDefinitionBuilder implements WidgetDefinitionBuilder, Serviceable, Disposable {
protected ServiceSelector widgetDefinitionBuilderSelector;
protected ServiceSelector widgetValidatorBuilderSelector;
protected DatatypeManager datatypeManager;
protected ExpressionManager expressionManager;
protected ServiceManager serviceManager;
public void service(ServiceManager serviceManager) throws ServiceException {
this.serviceManager = serviceManager;
this.widgetDefinitionBuilderSelector = (ServiceSelector)serviceManager.lookup( WidgetDefinitionBuilder.class.getName() + "Selector");
this.datatypeManager = (DatatypeManager)serviceManager.lookup(DatatypeManager.ROLE);
this.expressionManager = (ExpressionManager)serviceManager.lookup(ExpressionManager.ROLE);
this.widgetValidatorBuilderSelector = (ServiceSelector)serviceManager.lookup(WidgetValidatorBuilder.ROLE + "Selector");
}
protected void setLocation(Element widgetElement, AbstractWidgetDefinition widgetDefinition) {
widgetDefinition.setLocation(DomHelper.getLocation(widgetElement));
}
protected void setId(Element widgetElement, AbstractWidgetDefinition widgetDefinition) throws Exception {
String id = DomHelper.getAttribute(widgetElement, "id");
if (id.length() < 1) {
throw new Exception("Missing id attribute on element '" + widgetElement.getTagName() + "' at " +
DomHelper.getLocation(widgetElement));
}
widgetDefinition.setId(id);
}
protected WidgetDefinition buildAnotherWidgetDefinition(Element widgetDefinition) throws Exception {
String widgetName = widgetDefinition.getLocalName();
WidgetDefinitionBuilder builder = null;
try {
builder = (WidgetDefinitionBuilder)widgetDefinitionBuilderSelector.select(widgetName);
} catch (ServiceException e) {
throw new CascadingException("Unknown kind of widget '" + widgetName + "' at " +
DomHelper.getLocation(widgetDefinition), e);
}
return builder.buildWidgetDefinition(widgetDefinition);
}
protected List buildEventListeners(Element widgetElement, String elementName, Class listenerClass) throws Exception {
List result = null;
Element listenerElement = DomHelper.getChildElement(widgetElement, Constants.WD_NS, elementName);
if (listenerElement != null) {
NodeList list = listenerElement.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
WidgetListener listener = WidgetListenerBuilderUtil.getWidgetListener((Element)list.item(i), listenerClass);
if (result == null) result = new ArrayList();
result.add(listener);
}
}
}
return result == null ? Collections.EMPTY_LIST : result;
}
protected void setDisplayData(Element widgetElement, AbstractWidgetDefinition widgetDefinition) throws Exception {
final String[] names = {"label", "help", "hint"};
Map displayData = new HashMap(names.length);
for (int i = 0; i < names.length; i++) {
XMLizable data = null;
Element dataElement = DomHelper.getChildElement(widgetElement, Constants.WD_NS, names[i]);
if (dataElement != null) {
data = DomHelper.compileElementContent(dataElement);
}
// NOTE: We put also null values in the may in order to test their existence
// (see AbstractWidgetDefinition.generateDisplayData)
displayData.put(names[i], data);
}
widgetDefinition.setDisplayData(displayData);
}
protected void setValidators(Element widgetElement, AbstractWidgetDefinition widgetDefinition) throws Exception {
Element validatorElement = DomHelper.getChildElement(widgetElement, Constants.WD_NS, "validation");
if (validatorElement != null) {
NodeList list = validatorElement.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element)list.item(i);
String name = element.getLocalName();
WidgetValidatorBuilder builder;
try {
builder = (WidgetValidatorBuilder)this.widgetValidatorBuilderSelector.select(name);
} catch(ServiceException e) {
throw new CascadingException("Unknow kind of validator '" + name + "' at " +
DomHelper.getLocation(element), e);
}
widgetDefinition.addValidator(builder.build(element, widgetDefinition));
}
}
}
}
public void dispose() {
serviceManager.release(widgetDefinitionBuilderSelector);
serviceManager.release(datatypeManager);
serviceManager.release(expressionManager);
serviceManager.release(widgetValidatorBuilderSelector);
}
}