AbstractSharedInstanceBranchIndexer.java

package rocks.inspectit.shared.cs.indexing.indexer;

/**
 *
 * Abstract branch indexer for all indexers that work as shared instance.
 *
 * @param <E>
 *            Element type that indexer can return keys for.
 * @author Ivan Senic
 *
 */
public abstract class AbstractSharedInstanceBranchIndexer<E> implements IBranchIndexer<E> {

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean sharedInstance() {
		return true;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public IBranchIndexer<E> getNewInstance() {
		throw new UnsupportedOperationException("Branch indexer can not return new instance because it uses the shared one.");
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = (prime * result) + this.getClass().hashCode();
		return result;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		return true;
	}

}