private static class CharSource.CharSequenceCharSource extends CharSource
Modifier and Type | Field and Description |
---|---|
private static Splitter |
LINE_SPLITTER |
private java.lang.CharSequence |
seq |
Modifier | Constructor and Description |
---|---|
protected |
CharSequenceCharSource(java.lang.CharSequence seq) |
Modifier and Type | Method and Description |
---|---|
boolean |
isEmpty()
Returns whether the source has zero chars.
|
long |
length()
Returns the length of this source in chars, even if doing so requires opening and traversing an
entire stream.
|
Optional<java.lang.Long> |
lengthIfKnown()
Returns the size of this source in chars, if the size can be easily determined without actually
opening the data stream.
|
private java.lang.Iterable<java.lang.String> |
lines()
Returns an iterable over the lines in the string.
|
java.io.Reader |
openStream()
Opens a new
Reader for reading from this source. |
java.lang.String |
read()
Reads the contents of this source as a string.
|
java.lang.String |
readFirstLine()
Reads the first line of this source as a string.
|
ImmutableList<java.lang.String> |
readLines()
Reads all the lines of this source as a list of strings.
|
<T> T |
readLines(LineProcessor<T> processor)
Reads lines of text from this source, processing each line as it is read using the given
processor . |
java.lang.String |
toString() |
asByteSource, concat, concat, concat, copyTo, copyTo, empty, openBufferedStream, wrap
private static final Splitter LINE_SPLITTER
private final java.lang.CharSequence seq
protected CharSequenceCharSource(java.lang.CharSequence seq)
public java.io.Reader openStream()
CharSource
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.
openStream
in class CharSource
public java.lang.String read()
CharSource
read
in class CharSource
public boolean isEmpty()
CharSource
CharSource.lengthIfKnown()
returns zero, falling back to opening a stream and checking for EOF if
the length is not known.
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.
isEmpty
in class CharSource
public long length()
CharSource
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.
length
in class CharSource
public Optional<java.lang.Long> lengthIfKnown()
CharSource
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 StringBuilder
s, a subsequent read may
return a different number of chars if the contents are changed.
lengthIfKnown
in class CharSource
private java.lang.Iterable<java.lang.String> lines()
public java.lang.String readFirstLine()
CharSource
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.
readFirstLine
in class CharSource
public ImmutableList<java.lang.String> readLines()
CharSource
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.
readLines
in class CharSource
public <T> T readLines(LineProcessor<T> processor) throws java.io.IOException
CharSource
processor
. Stops when all lines have been processed or the processor
returns false
and returns the result produced by the processor.
Like BufferedReader
, this method breaks lines on any of \n
, \r
or
\r\n
, does not include the line separator in the lines passed to the processor
and does not consider there to be an extra empty line at the end if the content is terminated
with a line separator.
readLines
in class CharSource
java.io.IOException
- if an I/O error occurs in the process of reading from this source or if
processor
throws an IOException
public java.lang.String toString()
toString
in class java.lang.Object