Examples with FeaturePopulator org.openstreetmap.osmosis.core.database.FeaturePopulator used on opensource projects

Example 1 with FeaturePopulator

use of org.openstreetmap.osmosis.core.database.FeaturePopulator in project osmosis by openstreetmap.

the class EntityDao method iterate.

/**
 * Returns an iterator providing access to all entities in the database.
 *
 * @param tablePrefix
 *            The prefix for the entity table name. This allows another table to be queried if
 *            necessary such as a temporary results table.
 * @return The entity iterator.
 */
public ReleasableIterator<T> iterate(String tablePrefix) {
    try (ReleasableContainer releasableContainer = new ReleasableContainer()) {
        ReleasableIterator<T> entityIterator;
        List<FeaturePopulator<T>> featurePopulators;
        // Create the featureless entity iterator but also store it temporarily in the
        // releasable container so that it will get freed if we fail during retrieval of feature
        // populators.
        entityIterator = releasableContainer.add(getFeaturelessEntity(tablePrefix));
        // Retrieve the feature populators also adding them to the temporary releasable container.
        featurePopulators = getFeaturePopulators(tablePrefix);
        for (FeaturePopulator<T> featurePopulator : featurePopulators) {
            releasableContainer.add(featurePopulator);
        }
        // Build an entity reader capable of merging all sources together.
        entityIterator = new EntityReader<T>(entityIterator, featurePopulators);
        // The sources are now all attached to the history reader so we don't want to release
        // them in the finally block.
        releasableContainer.clear();
        return entityIterator;
    }
}