io.prestosql.jdbc.$internal.jackson.databind.ext.DOMDeserializer Maven / Gradle / Ivy
The newest version!
package io.prestosql.jdbc.$internal.jackson.databind.ext;
import java.io.StringReader;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
import io.prestosql.jdbc.$internal.jackson.databind.DeserializationContext;
import io.prestosql.jdbc.$internal.jackson.databind.deser.std.FromStringDeserializer;
/**
* Base for serializers that allows parsing DOM Documents from JSON Strings.
* Nominal type can be either {@link org.w3c.dom.Node} or
* {@link org.w3c.dom.Document}.
*/
public abstract class DOMDeserializer extends FromStringDeserializer
{
private static final long serialVersionUID = 1L;
private final static DocumentBuilderFactory DEFAULT_PARSER_FACTORY;
static {
DocumentBuilderFactory parserFactory = DocumentBuilderFactory.newInstance();
// yup, only cave men do XML without recognizing namespaces...
parserFactory.setNamespaceAware(true);
// [databind#1279]: make sure external entities NOT expanded by default
parserFactory.setExpandEntityReferences(false);
// ... and in general, aim for "safety"
try {
parserFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
} catch(ParserConfigurationException pce) {
// not much point to do anything; could log but...
} catch (Error e) {
// 14-Jul-2016, tatu: Not sure how or why, but during code coverage runs
// (via Cobertura) we get `java.lang.AbstractMethodError` so... ignore that too
}
// [databind#2589] add two more settings just in case
try {
parserFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
} catch (Throwable t) { } // as per previous one, nothing much to do
try {
parserFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
} catch (Throwable t) { } // as per previous one, nothing much to do
DEFAULT_PARSER_FACTORY = parserFactory;
}
protected DOMDeserializer(Class cls) { super(cls); }
@Override
public abstract T _deserialize(String value, DeserializationContext ctxt);
protected final Document parse(String value) throws IllegalArgumentException {
try {
return documentBuilder().parse(new InputSource(new StringReader(value)));
} catch (Exception e) {
throw new IllegalArgumentException("Failed to parse JSON String as XML: "+e.getMessage(), e);
}
}
/**
* Overridable factory method used to create {@link DocumentBuilder} for parsing
* XML as DOM.
*
* @since 2.7.6
*/
protected DocumentBuilder documentBuilder() throws ParserConfigurationException {
return DEFAULT_PARSER_FACTORY.newDocumentBuilder();
}
/*
/**********************************************************
/* Concrete deserializers
/**********************************************************
*/
public static class NodeDeserializer extends DOMDeserializer {
private static final long serialVersionUID = 1L;
public NodeDeserializer() { super(Node.class); }
@Override
public Node _deserialize(String value, DeserializationContext ctxt) throws IllegalArgumentException {
return parse(value);
}
}
public static class DocumentDeserializer extends DOMDeserializer {
private static final long serialVersionUID = 1L;
public DocumentDeserializer() { super(Document.class); }
@Override
public Document _deserialize(String value, DeserializationContext ctxt) throws IllegalArgumentException {
return parse(value);
}
}
}