Commons Imaging – JavaNCSS Metric Results

JavaNCSS Metric Results

[ package ] [ object ] [ method ] [ explanation ]

The following document contains the results of a JavaNCSS metric analysis, using JavaNCSS version 33.54.
JavaNCSS web site.

Packages

[ package ] [ object ] [ method ] [ explanation ]

Packages sorted by NCSS.

Package	Classes	Methods	NCSS	Javadocs	Javadoc lines	Single lines comment	Multi lines comment
org.apache.commons.imaging.formats.tiff	11	151	1987	12	82	163	206
org.apache.commons.imaging.formats.tiff.write	9	122	1282	3	31	88	163
org.apache.commons.imaging.common	15	146	1175	16	87	35	282
org.apache.commons.imaging.formats.tiff.constants	22	26	1145	17	91	38	408
org.apache.commons.imaging.formats.png	16	88	1136	3	12	120	428
org.apache.commons.imaging	13	200	977	135	1666	54	312
org.apache.commons.imaging.formats.bmp	11	54	892	1	10	125	195
org.apache.commons.imaging.palette	15	59	892	11	66	19	259
org.apache.commons.imaging.color	10	77	822	0	0	75	595
org.apache.commons.imaging.formats.jpeg	5	46	813	4	32	297	99
org.apache.commons.imaging.formats.pnm	13	84	758	1	10	52	227
org.apache.commons.imaging.common.itu_t4	6	38	662	8	67	18	115
org.apache.commons.imaging.formats.gif	7	38	655	1	10	88	131
org.apache.commons.imaging.formats.pcx	5	28	600	1	10	68	91
org.apache.commons.imaging.formats.jpeg.decoder	6	29	595	2	11	58	164
org.apache.commons.imaging.formats.tiff.taginfos	37	110	551	5	22	26	613
org.apache.commons.imaging.formats.jpeg.segments	13	54	516	11	50	59	228
org.apache.commons.imaging.formats.xpm	1	25	477	1	10	4	33
org.apache.commons.imaging.formats.ico	1	19	447	1	10	147	35
org.apache.commons.imaging.formats.psd	5	35	437	2	15	127	99
org.apache.commons.imaging.formats.tiff.datareaders	4	21	437	3	20	88	88
org.apache.commons.imaging.formats.jpeg.iptc	9	40	415	14	156	75	207
org.apache.commons.imaging.formats.icns	4	40	402	1	10	34	84
org.apache.commons.imaging.common.mylzw	5	47	380	0	0	12	99
org.apache.commons.imaging.icc	9	49	363	0	0	204	163
org.apache.commons.imaging.formats.png.chunks	12	33	318	6	18	17	220
org.apache.commons.imaging.formats.tiff.fieldtypes	8	28	290	1	3	7	147
org.apache.commons.imaging.formats.xbm	1	18	257	1	10	6	33
org.apache.commons.imaging.formats.jpeg.xmp	3	23	245	11	97	21	67
org.apache.commons.imaging.common.bytesource	4	30	232	1	4	9	83
org.apache.commons.imaging.formats.tiff.photometricinterpreters	8	20	201	1	17	27	152
org.apache.commons.imaging.internal	1	26	198	1	6	4	35
org.apache.commons.imaging.formats.jpeg.exif	1	17	189	15	205	20	35
org.apache.commons.imaging.formats.rgbe	3	23	170	1	5	8	67
org.apache.commons.imaging.formats.wbmp	1	17	143	1	10	5	33
org.apache.commons.imaging.formats.dcx	1	15	124	1	10	9	35
org.apache.commons.imaging.formats.psd.dataparsers	8	18	105	0	0	2	147
org.apache.commons.imaging.formats.png.scanlinefilters	6	10	87	0	0	23	115
org.apache.commons.imaging.formats.psd.datareaders	3	5	80	0	0	6	67
org.apache.commons.imaging.formats.png.transparencyfilters	4	10	61	2	6	3	83
org.apache.commons.imaging.formats.tga	0	0	3	0	0	247	35
org.apache.commons.imaging.formats	0	0	1	0	0	0	19

Classes total	Methods total	NCSS total	Javadocs	Javadoc lines	Single lines comment	Multi lines comment
316	1919	21520	295	2869	2488	6697

Objects

[ package ] [ object ] [ method ] [ explanation ]

TOP 30 classes containing the most NCSS.

Object	NCSS	Methods	Classes	Javadocs
org.apache.commons.imaging.formats.gif.GifImageParser	508	30	0	1
org.apache.commons.imaging.formats.jpeg.JpegImageParser	476	26	5	1
org.apache.commons.imaging.common.itu_t4.T4AndT6Compression	470	18	0	5
org.apache.commons.imaging.color.ColorConversions	457	41	0	0
org.apache.commons.imaging.formats.xpm.XpmImageParser	438	25	3	1
org.apache.commons.imaging.formats.tiff.TiffDirectory	425	47	1	0
org.apache.commons.imaging.formats.ico.IcoImageParser	412	19	7	1
org.apache.commons.imaging.formats.bmp.BmpImageParser	407	20	0	1
org.apache.commons.imaging.formats.png.PngImageParser	364	21	0	1
org.apache.commons.imaging.formats.tiff.write.TiffOutputDirectory	336	54	2	2
org.apache.commons.imaging.formats.tiff.TiffImageParser	322	19	0	1
org.apache.commons.imaging.formats.tiff.write.TiffImageWriterBase	322	10	0	0
org.apache.commons.imaging.formats.tiff.TiffField	309	29	1	9
org.apache.commons.imaging.formats.png.PngWriter	302	17	2	0
org.apache.commons.imaging.formats.tiff.TiffImageMetadata	289	23	3	0
org.apache.commons.imaging.formats.psd.PsdImageParser	289	23	0	1
org.apache.commons.imaging.Imaging	288	70	0	59
org.apache.commons.imaging.common.BasicCParser	284	5	0	1
org.apache.commons.imaging.palette.PaletteFactory	274	15	1	5
org.apache.commons.imaging.formats.pcx.PcxImageParser	248	18	1	1
org.apache.commons.imaging.formats.jpeg.decoder.JpegDecoder	245	11	0	0
org.apache.commons.imaging.formats.tiff.constants.ExifTagConstants	243	1	0	1
org.apache.commons.imaging.common.ByteConversions	242	45	0	1
org.apache.commons.imaging.formats.jpeg.decoder.Dct	233	9	0	2
org.apache.commons.imaging.formats.pcx.PcxWriter	227	4	0	0
org.apache.commons.imaging.formats.xbm.XbmImageParser	224	18	2	1
org.apache.commons.imaging.formats.tiff.TiffReader	216	13	3	0
org.apache.commons.imaging.formats.pnm.PnmImageParser	215	15	0	1
org.apache.commons.imaging.internal.Debug	184	26	0	1
org.apache.commons.imaging.formats.tiff.constants.TiffTagConstants	171	1	0	1

TOP 30 classes containing the most methods.

Object	NCSS	Methods	Classes	Javadocs
org.apache.commons.imaging.Imaging	288	70	0	59
org.apache.commons.imaging.formats.tiff.write.TiffOutputDirectory	336	54	2	2
org.apache.commons.imaging.formats.tiff.TiffDirectory	425	47	1	0
org.apache.commons.imaging.ImageParser	134	45	0	46
org.apache.commons.imaging.common.ByteConversions	242	45	0	1
org.apache.commons.imaging.color.ColorConversions	457	41	0	0
org.apache.commons.imaging.formats.gif.GifImageParser	508	30	0	1
org.apache.commons.imaging.formats.tiff.TiffField	309	29	1	9
org.apache.commons.imaging.common.BinaryFunctions	154	27	0	1
org.apache.commons.imaging.formats.jpeg.JpegImageParser	476	26	5	1
org.apache.commons.imaging.internal.Debug	184	26	0	1
org.apache.commons.imaging.formats.tiff.write.TiffOutputSet	139	25	0	1
org.apache.commons.imaging.formats.xpm.XpmImageParser	438	25	3	1
org.apache.commons.imaging.formats.tiff.TiffImageMetadata	289	23	3	0
org.apache.commons.imaging.formats.psd.PsdImageParser	289	23	0	1
org.apache.commons.imaging.ImageInfo	118	22	2	19
org.apache.commons.imaging.formats.png.PngImageParser	364	21	0	1
org.apache.commons.imaging.formats.bmp.BmpImageParser	407	20	0	1
org.apache.commons.imaging.formats.tiff.TiffImageParser	322	19	0	1
org.apache.commons.imaging.formats.ico.IcoImageParser	412	19	7	1
org.apache.commons.imaging.formats.xbm.XbmImageParser	224	18	2	1
org.apache.commons.imaging.formats.pcx.PcxImageParser	248	18	1	1
org.apache.commons.imaging.common.itu_t4.T4AndT6Compression	470	18	0	5
org.apache.commons.imaging.formats.png.PngWriter	302	17	2	0
org.apache.commons.imaging.formats.icns.IcnsImageParser	156	17	3	1
org.apache.commons.imaging.formats.wbmp.WbmpImageParser	115	17	1	1
org.apache.commons.imaging.formats.jpeg.exif.ExifRewriter	162	17	7	15
org.apache.commons.imaging.PixelDensity	62	17	0	1
org.apache.commons.imaging.common.mylzw.MyLzwCompressor	137	16	2	0
org.apache.commons.imaging.formats.pnm.PnmImageParser	215	15	0	1

Averages.

NCSS average	Program NCSS	Classes average	Methods average	Javadocs average
60.27	21,520.00	0.31	6.07	0.93

Methods

[ package ] [ object ] [ method ] [ explanation ]

TOP 30 Methods containing the most NCSS.

Methods	NCSS	CCN	Javadocs
org.apache.commons.imaging.formats.jpeg.JpegImageParser.getImageInfo(ByteSource,Object)	215	99	0
org.apache.commons.imaging.formats.png.PngWriter.writeImage(BufferedImage,OutputStream,Object)	144	41	0
org.apache.commons.imaging.formats.tiff.write.TiffImageWriterBase.writeImage(BufferedImage,OutputStream,Object)	143	47	0
org.apache.commons.imaging.common.BasicCParser.preprocess(InputStream,StringBuilder,String)	142	61	0
org.apache.commons.imaging.formats.ico.IcoImageParser.writeImage(BufferedImage,OutputStream,Object)	123	35	0
org.apache.commons.imaging.formats.tiff.TiffField.getValueDescription(Object)	117	49	0
org.apache.commons.imaging.formats.gif.GifImageParser.writeImage(BufferedImage,OutputStream,Object)	117	35	0
org.apache.commons.imaging.formats.bmp.BmpImageParser.readBmpHeaderInfo(InputStream,FormatCompliance)	116	15	0
org.apache.commons.imaging.formats.pnm.PnmImageParser.readHeader(InputStream)	109	58	0
org.apache.commons.imaging.formats.tiff.TiffImageParser.getImageInfo(ByteSource,Object)	100	27	0
org.apache.commons.imaging.formats.pcx.PcxWriter.writeImage(BufferedImage,OutputStream)	99	32	0
org.apache.commons.imaging.formats.tiff.write.TiffImageWriterBase.validateDirectories(TiffOutputSet)	99	51	0
org.apache.commons.imaging.formats.bmp.BmpImageParser.readImageContents(InputStream,FormatCompliance)	98	33	0
org.apache.commons.imaging.formats.png.PngImageParser.getBufferedImage(ByteSource,Object)	96	38	0
org.apache.commons.imaging.formats.pcx.PcxImageParser.readImage(PcxHeader,InputStream,ByteSource)	95	46	0
org.apache.commons.imaging.formats.ico.IcoImageParser.readBitmapIconData(IconData[],IconInfo)	90	24	0
org.apache.commons.imaging.formats.png.PngImageParser.getImageInfo(ByteSource,Object)	88	26	0
org.apache.commons.imaging.common.itu_t4.T4AndT6Compression.decompressT4_2D(outputStream.toByteArray[][],int,int,boolean)	86	26	1
org.apache.commons.imaging.formats.jpeg.segments.Segment.getSegmentType()	78	78	0
org.apache.commons.imaging.palette.MostPopulatedBoxesMedianCut.performNextMedianCut(ColorGroup,boolean)	77	24	0
org.apache.commons.imaging.common.BasicCParser.unescapeString(StringBuilder,String)	76	44	0
org.apache.commons.imaging.formats.tiff.TiffReader.readDirectory(ByteSource,long,int,FormatCompliance,Listener,boolean,Number)	73	33	0
org.apache.commons.imaging.Imaging.guessFormat(ByteSource)	72	46	1
org.apache.commons.imaging.formats.jpeg.decoder.Dct.inverseDCT8x8(a7[])	71	3	0
org.apache.commons.imaging.formats.xbm.XbmImageParser.readXbmImage(XbmHeader,BasicCParser)	70	41	0
org.apache.commons.imaging.formats.pcx.PcxWriter.writePixels(BufferedImage,int,int,int,SimplePalette,BinaryOutputStream)	70	29	0
org.apache.commons.imaging.common.itu_t4.T4AndT6Compression.decompressT6(ioException[][],int,int)	70	19	1
org.apache.commons.imaging.formats.jpeg.decoder.Dct.forwardDCT8x8(a43[])	69	3	0
org.apache.commons.imaging.icc.IccProfileParser.readICCProfileInfo(InputStream)	64	19	0
org.apache.commons.imaging.formats.icns.IcnsDecoder.decodeAllImages(IcnsImageParser.IcnsElement[])	62	25	0

Averages.

Program NCSS	NCSS average	CCN average	Javadocs average
21,520.00	7.77	3.18	0.11

Explanations

[ package ] [ object ] [ method ] [ explanation ]

Non Commenting Source Statements (NCSS)

Statements for JavaNCSS are not statements as specified in the Java Language Specification but include all kinds of declarations too. Roughly spoken, NCSS is approximately equivalent to counting ';' and '{' characters in Java source files.

Not counted are empty statements, empty blocks or semicolons after closing brackets. Of course, comments don't get counted too. Closing brackets also never get counted, the same applies to blocks in general.

	Examples
Package declaration	`package java.lang;`
Import declaration	`import java.awt.*;`
Class declaration	`public class Foo {` `public class Foo extends Bla {`
Interface declaration	`public interface Able ; {`
Field declaration	`int a;` `int a, b, c = 5, d = 6;`
Method declaration	`public void cry();` `public void gib() throws DeadException {`
Constructor declaration	`public Foo() {`
Constructor invocation	`this();` `super();`
Statement declaration	`i = 0;` `if (ok)` `if (exit) {` `if (3 == 4);` `if (4 == 4) { ;` `} else {`
Label declaration	`fine :`

In some cases consecutive semicolons are illegal according to the JLS but JavaNCSS still tolerates them (thought JavaNCSS is still more strict as 'javac'). Nevertheless they are never counted as two statements.

Cyclomatic Complexity Number (CCN)

CCN is also know as McCabe Metric. There exists a much hyped theory behind it based on graph theory, but it all comes down to simply counting 'if', 'for', 'while' statements etc. in a method. Whenever the control flow of a method splits, the "CCN counter" gets incremented by one.

Each method has a minimum value of 1 per default. For each of the following Java keywords/statements this value gets incremented by one:

if
for
while
case
catch

Also if the control flow of a method returns abortively the CCNvalue will be incremented by one:

if
for

An ordinary return at the end of method will not be counted.

Note that 'else', 'default', and 'finally' don't increment the CCN value any further. On the other hand, a simple method with a 'switch' statement and a huge block of 'case' statements can have a surprisingly high CCN value (still it has the same value when converting a 'switch' block to an equivalent sequence of 'if' statements).