@Deprecated
  public Map<String, String> getMergedKeyValueMetaData() {
    if (mergedKeyValueMetadata == null) {
      Map<String, String> mergedKeyValues = new HashMap<String, String>();
      for (Entry<String, Set<String>> entry : keyValueMetadata.entrySet()) {
        if (entry.getValue().size() > 1) {
          throw new RuntimeException("could not merge metadata: key " + entry.getKey() + " has conflicting values: " + entry.getValue());
        }
        mergedKeyValues.put(entry.getKey(), entry.getValue().iterator().next());
      }
      mergedKeyValueMetadata = mergedKeyValues;
    }
    return mergedKeyValueMetadata;
  }
@Deprecated
  public Map<String, String> getMergedKeyValueMetaData() {
    if (mergedKeyValueMetadata == null) {
      Map<String, String> mergedKeyValues = new HashMap<String, String>();
      for (Entry<String, Set<String>> entry : keyValueMetadata.entrySet()) {
        if (entry.getValue().size() > 1) {
          throw new RuntimeException("could not merge metadata: key " + entry.getKey() + " has conflicting values: " + entry.getValue());
        }
        mergedKeyValues.put(entry.getKey(), entry.getValue().iterator().next());
      }
      mergedKeyValueMetadata = mergedKeyValues;
    }
    return mergedKeyValueMetadata;
  }
@ Deprecated public Map < String , String > getMergedKeyValueMetaData ( ) { if ( mergedKeyValueMetadata == null ) { Map < String , String > mergedKeyValues = new HashMap < String , String > ( ) ; for ( Entry < String , Set < String > > entry : keyValueMetadata . entrySet ( ) ) { if ( entry . getValue ( ) . size ( ) > 1 ) { throw new RuntimeException ( "could not merge metadata: key " + entry . getKey ( ) + " has conflicting values: " + entry . getValue ( ) ) ; } mergedKeyValues . put ( entry . getKey ( ) , entry . getValue ( ) . iterator ( ) . next ( ) ) ; } mergedKeyValueMetadata = mergedKeyValues ; } return mergedKeyValueMetadata ; }
If there is a conflicting value when reading from multiple files,
an exception will be thrown
@return the merged key values metadata form the file footers
If there is a conflicting value when reading from multiple files an exception will be thrown