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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 org.onap.aaf.rosetta;
import java.util.Iterator;
import org.onap.aaf.inno.env.Env;
import org.onap.aaf.inno.env.TimeTaken;
public abstract class Marshal<T> implements Parse<T, Marshal.State> {
/* (non-Javadoc)
* @see com.att.rosetta.Parse#newParsed()
*/
@Override
public Parsed<State> newParsed() throws ParseException {
return new Parsed<State>(new State());
}
@Override
public TimeTaken start(Env env) {
//TODO is a way to mark not-JSON?
return env.start("Rosetta Marshal", Env.JSON);
};
public static class State {
// Note: Need a STATEFUL stack... one that will remain stateful until marked as finished
// "finished" is know by Iterators with no more to do/null
// Thus the concept of "Ladder", which one ascends and decends
public Ladder<Iterator<?>> ladder = new Ladder<Iterator<?>>();
public boolean smallest = true;
}
public static final Iterator<Void> DONE_ITERATOR = new Iterator<Void>() {
@Override
public boolean hasNext() {
return false;
}
@Override
public Void next() {
return null;
}
@Override
public void remove() {
}
};
/**
* Typical definition of Done is when Iterator in Ladder is "DONE_ITERATOR"
*
* It is important, however, that the "Ladder Rung" is set to the right level.
*
* @param state
* @return
*/
public boolean amFinished(State state) {
return DONE_ITERATOR.equals(state.ladder.peek());
}
}
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