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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aaf
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * ===========================================================================
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.cadi.wsse;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;
/**
* Match Class allows you to build an automatic Tree of StAX (or StAX like)
* Objects for frequent use.
*
* OBJECT is a type which you which to do some end Actions on, similar to a Visitor pattern, see Action
*
* Note: We have implemented with XReader and XEvent, rather than StAX for performance reasons.
*
* @see Action
* @see Match
* @see XEvent
* @see XReader
*
*
* @param <OUTPUT>
*/
//@SuppressWarnings("restriction")
public class Match<OUTPUT> {
private QName qname;
private Match<OUTPUT>[] next;
private Match<OUTPUT> prev;
private Action<OUTPUT> action = null;
private boolean stopAfter;
private boolean exclusive;
@SafeVarargs
public Match(String ns, String name, Match<OUTPUT> ... next) {
this.qname = new QName(ns,name);
this.next = next;
stopAfter = exclusive = false;
for(Match<OUTPUT> m : next) { // add the possible tags to look for
if(!m.stopAfter)m.prev = this;
}
}
public Match<OUTPUT> onMatch(OUTPUT output, XReader reader) throws XMLStreamException {
while(reader.hasNext()) {
XEvent event = reader.nextEvent();
switch(event.getEventType()) {
case XMLEvent.START_ELEMENT:
QName e_qname = event.asStartElement().getName();
//System.out.println("Start - " + e_qname);
boolean match = false;
for(Match<OUTPUT> m : next) {
if(e_qname.equals(m.qname)) {
match=true;
if(m.onMatch(output, reader)==null) {
return null; // short circuit Parsing
}
break;
}
}
if(exclusive && !match) // When Tag MUST be present, i.e. the Root Tag, versus info we're not interested in
return null;
break;
case XMLEvent.CHARACTERS:
//System.out.println("Data - " +event.asCharacters().getData());
if(action!=null) {
if(!action.content(output,event.asCharacters().getData())) {
return null;
}
}
break;
case XMLEvent.END_ELEMENT:
//System.out.println("End - " + event.asEndElement().getName());
if(event.asEndElement().getName().equals(qname)) {
return prev;
}
break;
case XMLEvent.END_DOCUMENT:
return null; // Exit Chain
}
}
return this;
}
/**
* When this Matched Tag has completed, Stop parsing and end
* @return
*/
public Match<OUTPUT> stopAfter() {
stopAfter = true;
return this;
}
/**
* Mark that this Object MUST be matched at this level or stop parsing and end
*
* @param action
* @return
*/
public Match<OUTPUT> exclusive() {
exclusive = true;
return this;
}
public Match<OUTPUT> set(Action<OUTPUT> action) {
this.action = action;
return this;
}
}
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