package info.bliki.wiki.template.extension;
import info.bliki.wiki.filter.WikipediaScanner;
import info.bliki.wiki.model.IContext;
import info.bliki.wiki.model.IWikiModel;
import info.bliki.wiki.template.AbstractTemplateFunction;
import info.bliki.wiki.template.ITemplateFunction;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* A template parser function for Java attributes. You can use the following
* syntax: <code>{{#$:object|formatstring|separator|null-value}}</code>.
*
* Example:
* <pre>
* public void testRendererForST() throws Exception {
* wikiModel.setAttribute("created", new GregorianCalendar(2005, 07 - 1, 05));
* wikiModel.registerRenderer(GregorianCalendar.class, wikiModel.new DateRenderer());
* String expecting = "date: 2005.07.05";
* assertEquals(expecting, wikiModel.parseTemplates("date: {{#$:created}}"));
* }
*
* public class DateRenderer implements AttributeRenderer {
* public String toString(Object o) {
* SimpleDateFormat f = new SimpleDateFormat("yyyy.MM.dd");
* return f.format(((Calendar) o).getTime());
* }
*
* public String toString(Object o, String formatString) {
* return toString(o);
* }
* }
*</pre>
*/
public class DollarContext extends AbstractTemplateFunction {
public final static ITemplateFunction CONST = new DollarContext();
public DollarContext() {
}
public String parseFunction(char[] src, int beginIndex, int endIndex, IWikiModel model) throws IOException {
if (model instanceof IContext) {
IContext context = (IContext) model;
List<String> list = new ArrayList<String>();
WikipediaScanner.splitByPipe(src, beginIndex, endIndex, list);
if (list.size() > 0) {
// name of the attribute
String attribute = parse(list.get(0), model);
if (attribute.length() > 0) {
String formatString = null;
String separatorString = null;
String nullvalueString = null;
if (list.size() > 1) {
// format string of the attribute
formatString = parse(list.get(1), model);
}
if (list.size() > 2) {
separatorString = parse(list.get(2), model);
if (separatorString.length() > 1) {
int begin = 0;
int end = separatorString.length();
if (separatorString.charAt(0) == '\'') {
begin = 1;
if (separatorString.charAt(end - 1) == '\'') {
end--;
} else {
begin = 0;
}
}
separatorString = separatorString.substring(begin, end);
}
}
if (list.size() > 3) {
nullvalueString = parse(list.get(3), model);
}
// get the assigned value of the attribute
Object value = context.getAttribute(attribute);
if (value != null) {
AttributeRenderer renderer;
StringBuilder builder;
if (value instanceof AttributeList && ((AttributeList) value).size() > 0) {
// multiple attribute values assigned
AttributeList attrList = (AttributeList) value;
builder = new StringBuilder(attrList.size() * 16);
builder.append(toString(context, attrList.get(0), formatString, nullvalueString));
for (int i = 1; i < attrList.size(); i++) {
if (separatorString != null) {
builder.append(separatorString);
}
builder.append(toString(context, attrList.get(i), formatString, nullvalueString));
}
return builder.toString();
} else {
builder = new StringBuilder();
// single attribute values assigned
builder.append(toString(context, value, formatString, nullvalueString));
return builder.toString();
}
}
}
}
}
return null;
}
private String toString(IContext context, Object value, String formatString, String nullvalueString) {
AttributeRenderer renderer;
if (value == null) {
renderer = context.getAttributeRenderer(String.class);
value = nullvalueString;
} else {
renderer = context.getAttributeRenderer(value.getClass());
}
if (renderer != null) {
return renderer.toString(value, formatString);
} else {
return value.toString();
}
}
}