Parsing, Creating, and Transforming XML Documents - Beginning Java 7 - page 950

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

class LocalRecipeML implements EntityResolver
{

private Map<String, String> mappings = new HashMap<>();
LocalRecipeML()
{

mappings.put("-//FormatData//DTD RecipeML 0.5//EN",
"recipeml.dtd");
}
@Override
public InputSource resolveEntity(String publicId, String
systemId)
{

if (mappings.containsKey(publicId))
{

System.out.println("obtaining cached re-

cipeml.dtd");
systemId = mappings.get(publicId);
InputSource

localSource = new In-

putSource(systemId);
return localSource;

}
return null;

}

}

Listing10-13 declares LocalRecipeML .Thisclass'sconstructorstorestheformal
publicidentifierfortheRecipeMLDTDandthesystemidentifierforalocalcopyofthis
DTD'sdocumentinamap—noticetheuseofJava7'sdiamondoperator( <> )tosimpli-
fy the hashmap instantiation expression.

Note Although it's unnecessary to use a map in this example (an if
(publicId.equals("-//FormatData//DTD RecipeML 0.5//EN"))