Package graphql.parser

Class MultiSourceReader

java.lang.Object

java.io.Reader

graphql.parser.MultiSourceReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

@PublicApi
public class MultiSourceReader
extends Reader

This reader allows you to read N number readers and combine them as one logical reader however you can then map back to the underlying readers in terms of their source name and the relative lines numbers. It can also track all data in memory if you want to have all of the previous read data in place at some point in time.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MultiSourceReader.Builder
static class	MultiSourceReader.SourceAndLine
private static class	MultiSourceReader.SourcePart

Field Summary

Fields

Modifier and Type	Field	Description
private int	currentIndex
private final StringBuilder	data
private int	overallLineNumber
private final LockKit.ReentrantLock	readerLock
private final List<MultiSourceReader.SourcePart>	sourceParts
private final boolean	trackData

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MultiSourceReader(MultiSourceReader.Builder builder)

Method Summary

Modifier and Type	Method	Description
private int	calcLineNumber()
void	close()
List<String>	getData()
int	getLineNumber()
int	getOverallLineNumber()
MultiSourceReader.SourceAndLine	getSourceAndLineFromOverallLine(int overallLineNumber)	This returns the source name and line number given an overall line number This is zeroes based like LineNumberReader.getLineNumber()
String	getSourceName()
static MultiSourceReader.Builder	newMultiSourceReader()
int	read(char[] cbuf, int off, int len)
private void	trackData(char[] cbuf, int off, int len)

Methods inherited from class java.io.Reader

mark, markSupported, read, read, read, ready, reset, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

sourceParts

private final List<MultiSourceReader.SourcePart> sourceParts

data

private final StringBuilder data

currentIndex

private int currentIndex

overallLineNumber

private int overallLineNumber

trackData

private final boolean trackData

readerLock

private final LockKit.ReentrantLock readerLock

Constructor Details

MultiSourceReader

private MultiSourceReader(MultiSourceReader.Builder builder)

Method Details

read

public int read(char[] cbuf,
 int off,
 int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

trackData

private void trackData(char[] cbuf,
 int off,
 int len)

calcLineNumber

private int calcLineNumber()

getSourceAndLineFromOverallLine

public MultiSourceReader.SourceAndLine getSourceAndLineFromOverallLine(int overallLineNumber)

This returns the source name and line number given an overall line number This is zeroes based like LineNumberReader.getLineNumber()

Parameters:

overallLineNumber - the over all line number

Returns:

the source name and relative line number to that source

getLineNumber

public int getLineNumber()

Returns:

the line number of the current source. This is zeroes based like LineNumberReader.getLineNumber()

getSourceName

public String getSourceName()

Returns:

The name of the current source

getOverallLineNumber

public int getOverallLineNumber()

Returns:

the overall line number of the all the sources. This is zeroes based like LineNumberReader.getLineNumber()

getData

public List<String> getData()

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException

newMultiSourceReader

public static MultiSourceReader.Builder newMultiSourceReader()