Package com.google.common.io

Class CharSource

java.lang.Object
com.google.common.io.CharSource
All Implemented Interfaces:
InputSupplier<Reader>
@Deprecated(since="2022-12-01") public abstract class CharSource extends Object implements InputSupplier<Reader>
Deprecated.
The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
A readable source of characters, such as a text file. Unlike a Reader, a CharSource is not an open, stateful stream of characters that can be read and closed. Instead, it is an immutable supplier of Reader instances.

CharSource provides two kinds of methods:

  • Methods that return a reader: These methods should return a new, independent instance each time they are called. The caller is responsible for ensuring that the returned reader is closed.
  • Convenience methods: These are implementations of common operations that are typically implemented by opening a reader using one of the methods in the first category, doing something and finally closing the reader that was opened.

Several methods in this class, such as readLines(), break the contents of the source into lines. Like BufferedReader, these methods break lines on any of \n, \r or \r\n, do not include the line separator in each line and do not consider there to be an empty line at the end if the contents are terminated with a line separator.

Any ByteSource containing text encoded with a specific character encoding may be viewed as a CharSource using ByteSource.asCharSource(Charset).

Since:
14.0

  • Constructor Details

    • CharSource

      public CharSource()
      Deprecated.

  • Method Details

    • openStream

      public abstract Reader openStream() throws IOException
      Deprecated.
      Opens a new Reader for reading from this source. This method should return a new, independent reader each time it is called.

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

      Throws:
      IOException - if an I/O error occurs in the process of opening the reader

    • getInput

      @Deprecated public final Reader getInput() throws IOException
      Deprecated.
      This method is only provided for temporary compatibility with the InputSupplier interface and should not be called directly. Use openStream() instead.
      This method is a temporary method provided for easing migration from suppliers to sources and sinks.
      Specified by:
      getInput in interface InputSupplier<Reader>
      Throws:
      IOException
      Since:
      15.0

    • openBufferedStream

      public BufferedReader openBufferedStream() throws IOException
      Deprecated.
      Opens a new BufferedReader for reading from this source. This method should return a new, independent reader each time it is called.

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

      Throws:
      IOException - if an I/O error occurs in the process of opening the reader

    • copyTo

      public long copyTo(Appendable appendable) throws IOException
      Deprecated.
      Appends the contents of this source to the given Appendable (such as a Writer). Does not close appendable if it is Closeable.
      Throws:
      IOException - if an I/O error occurs in the process of reading from this source or writing to appendable

    • copyTo

      public long copyTo(CharSink sink) throws IOException
      Deprecated.
      Copies the contents of this source to the given sink.
      Throws:
      IOException - if an I/O error occurs in the process of reading from this source or writing to sink

    • read

      public String read() throws IOException
      Deprecated.
      Reads the contents of this source as a string.
      Throws:
      IOException - if an I/O error occurs in the process of reading from this source

    • readFirstLine

      @Nullable public String readFirstLine() throws IOException
      Deprecated.
      Reads the first link of this source as a string. Returns null if this source is empty.

      Like BufferedReader, this method breaks lines on any of \n, \r or \r\n, does not include the line separator in the returned line and does not consider there to be an extra empty line at the end if the content is terminated with a line separator.

      Throws:
      IOException - if an I/O error occurs in the process of reading from this source

    • readLines

      public ImmutableList<String> readLines() throws IOException
      Deprecated.
      Reads all the lines of this source as a list of strings. The returned list will be empty if this source is empty.

      Like BufferedReader, this method breaks lines on any of \n, \r or \r\n, does not include the line separator in the returned lines and does not consider there to be an extra empty line at the end if the content is terminated with a line separator.

      Throws:
      IOException - if an I/O error occurs in the process of reading from this source

    • isEmpty

      public boolean isEmpty() throws IOException
      Deprecated.
      Returns whether the source has zero chars. The default implementation is to open a stream and check for EOF.
      Throws:
      IOException - if an I/O error occurs
      Since:
      15.0

    • concat

      public static CharSource concat(Iterable<? extends CharSource> sources)
      Deprecated.
      Concatenates multiple CharSource instances into a single source. Streams returned from the source will contain the concatenated data from the streams of the underlying sources.

      Only one underlying stream will be open at a time. Closing the concatenated stream will close the open underlying stream.

      Parameters:
      sources - the sources to concatenate
      Returns:
      a CharSource containing the concatenated data
      Since:
      15.0

    • concat

      public static CharSource concat(Iterator<? extends CharSource> sources)
      Deprecated.
      Concatenates multiple CharSource instances into a single source. Streams returned from the source will contain the concatenated data from the streams of the underlying sources.

      Only one underlying stream will be open at a time. Closing the concatenated stream will close the open underlying stream.

      Note: The input Iterator will be copied to an ImmutableList when this method is called. This will fail if the iterator is infinite and may cause problems if the iterator eagerly fetches data for each source when iterated (rather than producing sources that only load data through their streams). Prefer using the concat(Iterable) overload if possible.

      Parameters:
      sources - the sources to concatenate
      Returns:
      a CharSource containing the concatenated data
      Throws:
      NullPointerException - if any of sources is null
      Since:
      15.0

    • concat

      public static CharSource concat(CharSource... sources)
      Deprecated.
      Concatenates multiple CharSource instances into a single source. Streams returned from the source will contain the concatenated data from the streams of the underlying sources.

      Only one underlying stream will be open at a time. Closing the concatenated stream will close the open underlying stream.

      Parameters:
      sources - the sources to concatenate
      Returns:
      a CharSource containing the concatenated data
      Throws:
      NullPointerException - if any of sources is null
      Since:
      15.0

    • wrap

      public static CharSource wrap(CharSequence charSequence)
      Deprecated.
      Returns a view of the given character sequence as a CharSource. The behavior of the returned CharSource and any Reader instances created by it is unspecified if the charSequence is mutated while it is being read, so don't do that.
      Since:
      15.0 (since 14.0 as CharStreams.asCharSource(String))

    • empty

      public static CharSource empty()
      Deprecated.
      Returns an immutable CharSource that contains no characters.
      Since:
      15.0