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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2015 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.pull;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.event.SequenceReceiver;
import net.sf.saxon.expr.parser.ExplicitLocation;
import net.sf.saxon.expr.parser.Location;
import net.sf.saxon.om.AttributeCollection;
import net.sf.saxon.om.NamespaceBinding;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.util.Orphan;
import net.sf.saxon.type.SimpleType;
import net.sf.saxon.type.Type;
import java.util.List;
/**
* PullPushTee is a pass-through filter class that links one PullProvider to another PullProvider
* in a pipeline, copying all events that are read into a push pipeline, supplied in the form
* of a Receiver.
*
* This class can be used to insert a schema validator into a pull pipeline, since Saxon's schema
* validation is push-based. It could also be used to insert a serializer into the pipeline, allowing
* the XML document being "pulled" to be displayed for diagnostic purposes.
*/
public class PullPushTee extends PullFilter {
private Receiver branch;
boolean previousAtomic = false;
/**
* Create a PullPushTee
*
* @param base the PullProvider to which requests are to be passed
* @param branch the Receiver to which all events are to be copied, as "push" events.
* This Receiver must already be open before use
*/
public PullPushTee(/*@NotNull*/ PullProvider base, Receiver branch) throws XPathException {
super(base);
this.branch = branch;
//branch.open();
}
/**
* Get the Receiver to which events are being tee'd.
*
* @return the Receiver
*/
public Receiver getReceiver() {
return branch;
}
/**
* Get the next event. This implementation gets the next event from the underlying PullProvider,
* copies it to the branch Receiver, and then returns the event to the caller.
*
* @return an integer code indicating the type of event. The code
* {@link #END_OF_INPUT} is returned at the end of the sequence.
*/
public int next() throws XPathException {
currentEvent = super.next();
copyEvent(currentEvent);
return currentEvent;
}
/**
* Copy a pull event to a Receiver
*
* @param event the pull event to be copied
*/
private void copyEvent(int event) throws XPathException {
PullProvider in = getUnderlyingProvider();
Location loc = in.getSourceLocator();
if (loc == null) {
loc = ExplicitLocation.UNKNOWN_LOCATION;
}
Receiver out = branch;
switch (event) {
case START_DOCUMENT:
out.startDocument(0);
break;
case START_ELEMENT:
out.startElement(in.getNodeName(), in.getSchemaType(), loc, 0);
NamespaceBinding[] decl = in.getNamespaceDeclarations();
for (NamespaceBinding aDecl : decl) {
if (aDecl == null) {
break;
}
out.namespace(aDecl, 0);
}
AttributeCollection atts = in.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
out.attribute(atts.getNodeName(i), atts.getTypeAnnotation(i),
atts.getValue(i), loc, atts.getProperties(i));
}
out.startContent();
break;
case TEXT:
out.characters(in.getStringValue(), loc, 0);
break;
case COMMENT:
out.comment(in.getStringValue(), loc, 0);
break;
case PROCESSING_INSTRUCTION:
out.processingInstruction(
in.getNodeName().getLocalPart(),
in.getStringValue(), loc, 0);
break;
case END_ELEMENT:
out.endElement();
break;
case END_DOCUMENT:
List entities = in.getUnparsedEntities();
if (entities != null) {
for (Object entity : entities) {
UnparsedEntity ue = (UnparsedEntity) entity;
out.setUnparsedEntity(ue.getName(), ue.getSystemId(), ue.getPublicId());
}
}
out.endDocument();
break;
case END_OF_INPUT:
in.close();
//out.close();
break;
case ATOMIC_VALUE:
if (out instanceof SequenceReceiver) {
((SequenceReceiver) out).append(super.getAtomicValue(), loc, 0);
break;
} else {
if (previousAtomic) {
out.characters(" ", loc, 0);
}
CharSequence chars = in.getStringValue();
out.characters(chars, loc, 0);
break;
}
case ATTRIBUTE:
if (out instanceof SequenceReceiver) {
Orphan o = new Orphan(in.getPipelineConfiguration().getConfiguration());
o.setNodeName(getNodeName());
o.setNodeKind(Type.ATTRIBUTE);
o.setStringValue(getStringValue());
((SequenceReceiver) out).append(o, loc, 0);
break;
} else {
out.attribute(getNodeName(),
(SimpleType) in.getSchemaType(), getStringValue(), loc, 0);
break;
//throw new XPathException("Cannot serialize a free-standing attribute node");
}
case NAMESPACE:
if (out instanceof SequenceReceiver) {
Orphan o = new Orphan(in.getPipelineConfiguration().getConfiguration());
o.setNodeName(getNodeName());
o.setNodeKind(Type.NAMESPACE);
o.setStringValue(getStringValue());
((SequenceReceiver) out).append(o, loc, 0);
break;
} else {
out.namespace(new NamespaceBinding(getNodeName().getPrefix(), getNodeName().getURI()), 0);
break;
//throw new XPathException("Cannot serialize a free-standing namespace node");
}
default:
throw new UnsupportedOperationException("" + event);
}
previousAtomic = event == ATOMIC_VALUE;
}
}
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