Examples with TimestampSetter org.openstreetmap.osmosis.core.change.v0_6.impl.TimestampSetter used on opensource projects

Example 1 with TimestampSetter

use of org.openstreetmap.osmosis.core.change.v0_6.impl.TimestampSetter in project osmosis by openstreetmap.

the class ChangeDeriver method run.

/**
 * Processes the input sources and sends the changes to the change sink.
 */
public void run() {
    try {
        EntityContainerComparator comparator;
        EntityContainer fromEntityContainer = null;
        EntityContainer toEntityContainer = null;
        TimestampSetter timestampSetter;
        // Create a comparator for comparing two entities by type and identifier.
        comparator = new EntityContainerComparator(new EntityByTypeThenIdComparator());
        // Create an object for setting the current timestamp on entities being deleted.
        timestampSetter = new TimestampSetter();
        // We can't get meaningful data from the initialize data on the
        // input streams, so pass empty meta data to the sink and discard
        // the input meta data.
        fromPostbox.outputInitialize();
        toPostbox.outputInitialize();
        changeSink.initialize(Collections.<String, Object>emptyMap());
        // We continue in the comparison loop while both sources still have data.
        while ((fromEntityContainer != null || fromPostbox.hasNext()) && (toEntityContainer != null || toPostbox.hasNext())) {
            int comparisonResult;
            // Get the next input data where required.
            if (fromEntityContainer == null) {
                fromEntityContainer = fromPostbox.getNext();
            }
            if (toEntityContainer == null) {
                toEntityContainer = toPostbox.getNext();
            }
            // Compare the two sources.
            comparisonResult = comparator.compare(fromEntityContainer, toEntityContainer);
            if (comparisonResult < 0) {
                // The from entity doesn't exist on the to source therefore
                // has been deleted. We don't know when the entity was
                // deleted so set the delete time to the current time.
                changeSink.process(new ChangeContainer(timestampSetter.updateTimestamp(fromEntityContainer), ChangeAction.Delete));
                fromEntityContainer = null;
            } else if (comparisonResult > 0) {
                // The to entity doesn't exist on the from source therefore has
                // been created.
                changeSink.process(new ChangeContainer(toEntityContainer, ChangeAction.Create));
                toEntityContainer = null;
            } else {
                // entity has been modified.
                if (!fromEntityContainer.getEntity().equals(toEntityContainer.getEntity())) {
                    changeSink.process(new ChangeContainer(toEntityContainer, ChangeAction.Modify));
                }
                fromEntityContainer = null;
                toEntityContainer = null;
            }
        }
        // Any remaining "from" entities are deletes.
        while (fromEntityContainer != null || fromPostbox.hasNext()) {
            if (fromEntityContainer == null) {
                fromEntityContainer = fromPostbox.getNext();
            }
            // The from entity doesn't exist on the to source therefore
            // has been deleted. We don't know when the entity was
            // deleted so set the delete time to the current time.
            changeSink.process(new ChangeContainer(timestampSetter.updateTimestamp(fromEntityContainer), ChangeAction.Delete));
            fromEntityContainer = null;
        }
        // Any remaining "to" entities are creates.
        while (toEntityContainer != null || toPostbox.hasNext()) {
            if (toEntityContainer == null) {
                toEntityContainer = toPostbox.getNext();
            }
            changeSink.process(new ChangeContainer(toEntityContainer, ChangeAction.Create));
            toEntityContainer = null;
        }
        changeSink.complete();
        fromPostbox.outputComplete();
        toPostbox.outputComplete();
    } finally {
        changeSink.close();
        fromPostbox.outputRelease();
        toPostbox.outputRelease();
    }
}