/wro4j-core/src/main/java/ro/isdc/wro/model/resource/support/change/ResourceChangeInfo.java
private char currentHash;
private String currentHash;
import java.util.Set; import org.apache.commons.lang3.builder.ToStringBuilder; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public final class ResourceChangeInfo { private static final Logger LOG = LoggerFactory.getLogger(ResourceChangeInfo.class); <extra_id_0> private String prevHash; private final Set<String> groups = Collections.synchronizedSet(new HashSet<String>()); public void updateHashForGroup(final String hash, final String groupName) { notNull(groupName); this.currentHash = hash; if (isChangedHash()) {