Source Code Cross Referenced for LineCounter.java in  » UML » jrefactory » org » acm » seguin » metrics » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » UML » jrefactory » org.acm.seguin.metrics 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Author:  Chris Seguin
003:         *
004:         *  This software has been developed under the copyleft
005:         *  rules of the GNU General Public License.  Please
006:         *  consult the GNU General Public License for more
007:         *  details about use and distribution of this software.
008:         */
009:        package org.acm.seguin.metrics;
010:
011:        import java.io.File;
012:        import java.io.FileInputStream;
013:        import java.io.IOException;
014:        import java.io.InputStream;
015:        import org.acm.seguin.awt.ExceptionPrinter;
016:
017:        /**
018:         *  Counts the number of lines in a file
019:         *
020:         *@author     Chris Seguin
021:         *@created    June 30, 1999
022:         */
023:        public class LineCounter {
024:            File file;
025:
026:            /**
027:             *  Constructor for the LineCounter object
028:             *
029:             *@param  init  File to count
030:             */
031:            public LineCounter(File init) {
032:                file = init;
033:            }
034:
035:            /**
036:             *  Counts the number of lines in a file
037:             *
038:             *@return    The number of lines in the file
039:             */
040:            public int countLines() {
041:                int count = 1;
042:                try {
043:                    FileInputStream in = new FileInputStream(file);
044:                    int ch = 0;
045:
046:                    while (ch != -1) {
047:                        ch = in.read();
048:                        count += countCharacter(ch, in);
049:                    }
050:
051:                    in.close();
052:                } catch (IOException ioe) {
053:                    ExceptionPrinter.print(ioe, false);
054:                }
055:
056:                return count;
057:            }
058:
059:            /**
060:             *  Prints the message
061:             *
062:             *@return    The number of lines in the file
063:             */
064:            public int printMessage() {
065:                int count = countLines();
066:                if (count < 10) {
067:                    System.out
068:                            .println("      " + count + "  " + file.getPath());
069:                } else if (count < 100) {
070:                    System.out.println("     " + count + "  " + file.getPath());
071:                } else if (count < 1000) {
072:                    System.out.println("    " + count + "  " + file.getPath());
073:                } else if (count < 10000) {
074:                    System.out.println("   " + count + "  " + file.getPath());
075:                } else if (count < 100000) {
076:                    System.out.println("  " + count + "  " + file.getPath());
077:                } else {
078:                    System.out.println(" " + count + "  " + file.getPath());
079:                }
080:
081:                return count;
082:            }
083:
084:            /**
085:             *  Counts how many lines a character counts as (depends on next character
086:             *  sometimes)
087:             *
088:             *@param  ch               The character to be counted
089:             *@param  in               The input stream
090:             *@return                  The number to add to the ongoing count
091:             *@exception  IOException  Thrown if unable to read from the input stream
092:             */
093:            protected int countCharacter(int ch, InputStream in)
094:                    throws IOException {
095:                if (ch == '\n') {
096:                    return 1;
097:                } else if (ch == '\r') {
098:                    int next = in.read();
099:                    if (next == '\n') {
100:                        return 1;
101:                    } else {
102:                        return 1 + countCharacter(next, in);
103:                    }
104:                }
105:
106:                return 0;
107:            }
108:
109:            /**
110:             *  Main program
111:             *
112:             *@param  args  Command line arguments
113:             */
114:            public static void main(String[] args) {
115:                if (args.length == 0) {
116:                    System.out
117:                            .println("Syntax:  java org.acm.seguin.metrics.LineCounter <filename>");
118:                    return;
119:                }
120:
121:                int count = (new LineCounter(new File(args[0]))).printMessage();
122:            }
123:        }
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