Class CharSource.ConcatenatedCharSource

java.lang.Object
com.google.common.io.CharSource
com.google.common.io.CharSource.ConcatenatedCharSource
Enclosing class:
CharSource

private static final class CharSource.ConcatenatedCharSource extends CharSource
  • Field Details

  • Constructor Details

  • Method Details

    • openStream

      public Reader openStream() throws IOException
      Description copied from class: CharSource
      Opens a new Reader for reading from this source. This method returns a new, independent reader each time it is called.

      The caller is responsible for ensuring that the returned reader is closed.

      Specified by:
      openStream in class CharSource
      Throws:
      IOException - if an I/O error occurs while opening the reader
    • isEmpty

      public boolean isEmpty() throws IOException
      Description copied from class: CharSource
      Returns whether the source has zero chars. The default implementation first checks CharSource.lengthIfKnown(), returning true if it's known to be zero and false if it's known to be non-zero. If the length is not known, it falls back to opening a stream and checking for EOF.

      Note that, in cases where lengthIfKnown returns zero, it is possible that chars are actually available for reading. This means that a source may return true from isEmpty() despite having readable content.

      Overrides:
      isEmpty in class CharSource
      Throws:
      IOException - if an I/O error occurs
    • lengthIfKnown

      public Optional<Long> lengthIfKnown()
      Description copied from class: CharSource
      Returns the size of this source in chars, if the size can be easily determined without actually opening the data stream.

      The default implementation returns Optional.absent(). Some sources, such as a CharSequence, may return a non-absent value. Note that in such cases, it is possible that this method will return a different number of chars than would be returned by reading all of the chars.

      Additionally, for mutable sources such as StringBuilders, a subsequent read may return a different number of chars if the contents are changed.

      Overrides:
      lengthIfKnown in class CharSource
    • length

      public long length() throws IOException
      Description copied from class: CharSource
      Returns the length of this source in chars, even if doing so requires opening and traversing an entire stream. To avoid a potentially expensive operation, see CharSource.lengthIfKnown().

      The default implementation calls CharSource.lengthIfKnown() and returns the value if present. If absent, it will fall back to a heavyweight operation that will open a stream, skip to the end of the stream, and return the total number of chars that were skipped.

      Note that for sources that implement CharSource.lengthIfKnown() to provide a more efficient implementation, it is possible that this method will return a different number of chars than would be returned by reading all of the chars.

      In either case, for mutable sources such as files, a subsequent read may return a different number of chars if the contents are changed.

      Overrides:
      length in class CharSource
      Throws:
      IOException - if an I/O error occurs while reading the length of this source
    • toString

      public String toString()
      Overrides:
      toString in class Object