/*
* 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.
*/
package org.apache.cocoon.forms.formmodel;
import org.apache.excalibur.xml.sax.XMLizable;
import org.apache.cocoon.forms.FormsConstants;
import org.apache.cocoon.forms.FormsException;
import org.apache.cocoon.forms.util.DomHelper;
import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.Perl5Compiler;
import org.outerj.expression.Expression;
import org.w3c.dom.Element;
/**
* Builds {@link AggregateFieldDefinition}s.
*
* @version $Id: AggregateFieldDefinitionBuilder.java 615293 2008-01-25 18:12:43Z vgritsenko $
*/
public class AggregateFieldDefinitionBuilder extends FieldDefinitionBuilder {
public WidgetDefinition buildWidgetDefinition(Element widgetElement, WidgetDefinitionBuilderContext context)
throws Exception {
AggregateFieldDefinition definition = new AggregateFieldDefinition();
setupDefinition(widgetElement, definition, context);
definition.makeImmutable();
return definition;
}
protected void setupDefinition(Element widgetElement, AggregateFieldDefinition definition, WidgetDefinitionBuilderContext context)
throws Exception {
// parse the field definition
super.setupDefinition(widgetElement, definition, context);
// make children fields
Element widgetsElement = DomHelper.getChildElement(widgetElement, FormsConstants.DEFINITION_NS, "widgets", true);
Element[] fieldElements = DomHelper.getChildElements(widgetsElement, FormsConstants.DEFINITION_NS, "field");
for (int i = 0; i < fieldElements.length; i++) {
FieldDefinition fd = (FieldDefinition) buildAnotherWidgetDefinition(fieldElements[i], context);
definition.addWidgetDefinition(fd);
}
// compile splitpattern
Element splitElement = DomHelper.getChildElement(widgetElement, FormsConstants.DEFINITION_NS, "split", true);
if (splitElement != null) {
String patternString = DomHelper.getAttribute(splitElement, "pattern");
Perl5Compiler compiler = new Perl5Compiler();
Pattern pattern;
try {
pattern = compiler.compile(patternString, Perl5Compiler.READ_ONLY_MASK);
} catch (MalformedPatternException e) {
throw new FormsException("Invalid regular expression '" + patternString + "'.",
e, DomHelper.getLocationObject(splitElement));
}
definition.setSplitPattern(pattern, patternString);
}
// read split mappings
Element[] mapElements = DomHelper.getChildElements(splitElement, FormsConstants.DEFINITION_NS, "map");
for (int i = 0; i < mapElements.length; i++) {
int group = DomHelper.getAttributeAsInteger(mapElements[i], "group");
String field = DomHelper.getAttribute(mapElements[i], "field");
// check that this field exists
if (!definition.hasWidget(field)) {
throw new FormsException("Unknown widget id '" + field + "' referenced.",
DomHelper.getLocationObject(mapElements[i]));
}
try {
definition.addSplitMapping(group, field);
} catch(RuntimeException e) {
throw new FormsException("Two groups are mapped to the same widget id '" + field + "'.",
DomHelper.getLocationObject(mapElements[i]));
}
}
// read split fail message (if any)
Element failMessageElement = DomHelper.getChildElement(splitElement, FormsConstants.DEFINITION_NS, "failmessage");
if (failMessageElement != null) {
XMLizable failMessage = DomHelper.compileElementContent(failMessageElement);
definition.setSplitFailMessage(failMessage);
}
// compile combine expression
Element combineElement = DomHelper.getChildElement(widgetElement, FormsConstants.DEFINITION_NS, "combine", true);
if(combineElement!=null) {
String combineExprString = DomHelper.getAttribute(combineElement, "expression");
Expression combineExpr;
try {
combineExpr = expressionManager.parse(combineExprString);
} catch (Exception e) {
throw new FormsException("Invalid combine expression '" + combineExprString + "'.",
e, DomHelper.getLocationObject(combineElement));
}
Class clazz = definition.getDatatype().getTypeClass();
if (combineExpr.getResultType() != null && !clazz.isAssignableFrom(combineExpr.getResultType())) {
throw new FormsException("The result of the combine expression should be '" + clazz.getName() + "', not '" + combineExpr.getResultType().getName() + "'.",
DomHelper.getLocationObject(combineElement));
}
definition.setCombineExpression(combineExpr);
}
}
}