/*
* 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.datatype;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.apache.cocoon.woody.Constants;
import org.apache.cocoon.woody.datatype.convertor.Convertor;
import org.apache.cocoon.woody.datatype.convertor.DefaultFormatCache;
import org.apache.cocoon.xml.AttributesImpl;
import org.apache.excalibur.xml.sax.XMLizable;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Locale;
/**
* An implementation of a SelectionList. Create instances of this class by using
* the {@link SelectionListBuilder}. This implementation is called "Static" because
* the items in the list are build once from its source, and then list items are
* cached as part of this object. In contrast, the {@link DynamicSelectionList}
* will retrieve its content from its source each time it's needed.
*
* @version $Id: StaticSelectionList.java,v 1.12 2004/03/09 13:54:04 reinhard Exp $
*/
public class StaticSelectionList implements SelectionList {
/** The datatype to which this selection list belongs */
private Datatype datatype;
private List items = new ArrayList();
public StaticSelectionList(Datatype datatype) {
this.datatype = datatype;
}
public Datatype getDatatype() {
return datatype;
}
public void generateSaxFragment(ContentHandler contentHandler, Locale locale) throws SAXException {
Convertor.FormatCache formatCache = new DefaultFormatCache();
contentHandler.startElement(Constants.WI_NS, SELECTION_LIST_EL, Constants.WI_PREFIX_COLON + SELECTION_LIST_EL, Constants.EMPTY_ATTRS);
Iterator itemIt = items.iterator();
while (itemIt.hasNext()) {
SelectionListItem item = (SelectionListItem)itemIt.next();
item.generateSaxFragment(contentHandler, locale, formatCache);
}
contentHandler.endElement(Constants.WI_NS, SELECTION_LIST_EL, Constants.WI_PREFIX_COLON + SELECTION_LIST_EL);
}
public List getItems() {
return items;
}
/**
* Adds a new item to this selection list.
* @param value a value of the correct type (i.e. the type with which this selectionlist is associated)
* @param label a SAX-fragment such as a {@link org.apache.cocoon.xml.SaxBuffer}, can be null
*/
public void addItem(Object value, XMLizable label) {
items.add(new SelectionListItem(value, label));
}
public final class SelectionListItem {
private final Object value;
private final XMLizable label;
public SelectionListItem(Object value, XMLizable label) {
this.value = value;
this.label = label;
}
public Object getValue() {
return value;
}
public void generateSaxFragment(ContentHandler contentHandler, Locale locale, Convertor.FormatCache formatCache)
throws SAXException
{
AttributesImpl itemAttrs = new AttributesImpl();
String stringValue;
if (this.value == null) {
// Null value translates into the empty string
stringValue = "";
} else {
stringValue = datatype.getConvertor().convertToString(value, locale, formatCache);
}
itemAttrs.addCDATAAttribute("value", stringValue);
contentHandler.startElement(Constants.WI_NS, ITEM_EL, Constants.WI_PREFIX_COLON + ITEM_EL, itemAttrs);
contentHandler.startElement(Constants.WI_NS, LABEL_EL, Constants.WI_PREFIX_COLON + LABEL_EL, Constants.EMPTY_ATTRS);
if (label != null) {
label.toSAX(contentHandler);
} else {
contentHandler.characters(stringValue.toCharArray(), 0, stringValue.length());
}
contentHandler.endElement(Constants.WI_NS, LABEL_EL, Constants.WI_PREFIX_COLON + LABEL_EL);
contentHandler.endElement(Constants.WI_NS, ITEM_EL, Constants.WI_PREFIX_COLON + ITEM_EL);
}
}
}