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package com.sun.xml.bind.v2.runtime.unmarshaller;
import java.util.Collection;
import java.util.Collections;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.ValidationEvent;
import javax.xml.bind.helpers.ValidationEventImpl;
import javax.xml.namespace.QName;
import com.sun.xml.bind.v2.runtime.JaxBeanInfo;
import org.xml.sax.SAXException;
/**
* @author Kohsuke Kawaguchi
*/
public abstract class Loader {
// allow derived classes to change it later
protected boolean expectText;
protected Loader(boolean expectText) {
this.expectText = expectText;
}
protected Loader() {
}
//
//
//
// Contract
//
//
//
/**
* Called when the loader is activated, which is when a new start tag is seen
* and when the parent designated this loader as the child loader.
*
*
* The callee may change state.loader to designate another {@link Loader}
* for the processing. It's the responsibility of the callee to forward the startElement
* event in such a case.
*
* @param ea
* info about the start tag. never null.
*/
public void startElement(UnmarshallingContext.State state,TagName ea) throws SAXException {
}
/**
* Called when this loaderis an active loaderand we see a new child start tag.
*
*
* The callee is expected to designate another loaderas a loaderthat processes
* this element, then it should also register a {@link Receiver}.
* The designated loaderwill become an active loader.
*
*
* The default implementation reports an error saying an element is unexpected.
*/
public void childElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
// notify the error, then recover by ignoring the whole element.
reportUnexpectedChildElement(ea, true);
state.setLoader(Discarder.INSTANCE);
state.setReceiver(null);
}
@SuppressWarnings({"StringEquality"})
protected final void reportUnexpectedChildElement(TagName ea, boolean canRecover) throws SAXException {
if (canRecover) {
// this error happens particurly often (when input documents contain a lot of unexpected elements to be ignored),
// so don't bother computing all the messages and etc if we know that
// there's no event handler to receive the error in the end. See #286
UnmarshallingContext context = UnmarshallingContext.getInstance();
if (!context.parent.hasEventHandler() // is somebody listening?
|| !context.shouldErrorBeReported()) // should we report error?
return;
}
if(ea.uri!=ea.uri.intern() || ea.local!=ea.local.intern())
reportError(Messages.UNINTERNED_STRINGS.format(), canRecover );
else
reportError(Messages.UNEXPECTED_ELEMENT.format(ea.uri,ea.local,computeExpectedElements()), canRecover );
}
/**
* Returns a set of tag names expected as possible child elements in this context.
*/
public Collection getExpectedChildElements() {
return Collections.emptyList();
}
/**
* Returns a set of tag names expected as possible child elements in this context.
*/
public Collection getExpectedAttributes() {
return Collections.emptyList();
}
/**
* Called when this loaderis an active loaderand we see a chunk of text.
*
* The runtime makes sure that adjacent characters (even those separated
* by comments, PIs, etc) are reported as one event.
* IOW, you won't see two text event calls in a row.
*/
public void text(UnmarshallingContext.State state, CharSequence text) throws SAXException {
// make str printable
text = text.toString().replace('\r',' ').replace('\n',' ').replace('\t',' ').trim();
reportError(Messages.UNEXPECTED_TEXT.format(text), true );
}
/**
* True if this loader expects the {@link #text(UnmarshallingContext.State, CharSequence)} method
* to be called. False otherwise.
*/
public final boolean expectText() {
return expectText;
}
/**
* Called when this loaderis an active loaderand we see an end tag.
*/
public void leaveElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
}
//
//
//
// utility methods
//
//
//
/**
* Computes the names of possible root elements for a better error diagnosis.
*/
private String computeExpectedElements() {
StringBuilder r = new StringBuilder();
for( QName n : getExpectedChildElements() ) {
if(r.length()!=0) r.append(',');
r.append("<{").append(n.getNamespaceURI()).append('}').append(n.getLocalPart()).append('>');
}
if(r.length()==0) {
return "(none)";
}
return r.toString();
}
/**
* Fires the beforeUnmarshal event if necessary.
*
* @param state
* state of the newly create child object.
*/
protected final void fireBeforeUnmarshal(JaxBeanInfo beanInfo, Object child, UnmarshallingContext.State state) throws SAXException {
if(beanInfo.lookForLifecycleMethods()) {
UnmarshallingContext context = state.getContext();
Unmarshaller.Listener listener = context.parent.getListener();
if(beanInfo.hasBeforeUnmarshalMethod()) {
beanInfo.invokeBeforeUnmarshalMethod(context.parent, child, state.getPrev().getTarget());
}
if(listener!=null) {
listener.beforeUnmarshal(child, state.getPrev().getTarget());
}
}
}
/**
* Fires the afterUnmarshal event if necessary.
*
* @param state
* state of the parent object
*/
protected final void fireAfterUnmarshal(JaxBeanInfo beanInfo, Object child, UnmarshallingContext.State state) throws SAXException {
// fire the event callback
if(beanInfo.lookForLifecycleMethods()) {
UnmarshallingContext context = state.getContext();
Unmarshaller.Listener listener = context.parent.getListener();
if(beanInfo.hasAfterUnmarshalMethod()) {
beanInfo.invokeAfterUnmarshalMethod(context.parent, child, state.getTarget());
}
if(listener!=null)
listener.afterUnmarshal(child, state.getTarget());
}
}
/**
* Last resort when something goes terribly wrong within the unmarshaller.
*/
protected static void handleGenericException(Exception e) throws SAXException {
handleGenericException(e,false);
}
public static void handleGenericException(Exception e, boolean canRecover) throws SAXException {
reportError(e.getMessage(), e, canRecover );
}
public static void handleGenericError(Error e) throws SAXException {
reportError(e.getMessage(), false);
}
protected static void reportError(String msg, boolean canRecover) throws SAXException {
reportError(msg, null, canRecover );
}
public static void reportError(String msg, Exception nested, boolean canRecover) throws SAXException {
UnmarshallingContext context = UnmarshallingContext.getInstance();
context.handleEvent( new ValidationEventImpl(
canRecover? ValidationEvent.ERROR : ValidationEvent.FATAL_ERROR,
msg,
context.getLocator().getLocation(),
nested ), canRecover );
}
/**
* This method is called by the generated derived class
* when a datatype parse method throws an exception.
*/
protected static void handleParseConversionException(UnmarshallingContext.State state, Exception e) throws SAXException {
// wrap it into a ParseConversionEvent and report it
state.getContext().handleError(e);
}
}