Hi, I need some help with this java project. Thank you!

Here is the prompt; it has three parts:

In this assignment, write code to analyze a string character-by-character and return the field values within it. This is called parsing.

Do not use String split, Scanner or other code that has similar functionality in your implementation of this assignment. The intent of this assignment is that you learn the process of analyzing and decision making when looking through a string of characters using loops and branch statements.

Create a new project, CSVParser is a reasonable choice.

A skeleton file with all the methods for P7 is CSVParser.java. Right-click on the file link to save the file. Move the file to the project source folder.

Read through the comments. In part 1, implement the method with header:

public static String[] separate(String text) 

Then generalize to use any delimiter passed as a parameter in:

public static String[] separate(String text, char delimiter) 

Note that once the 2nd method is implemented then the implementation of the first method could be changed to be:

public static String[] separate(String text) { return separate( text, ','); } 

A test bench for all the methods in P7 is TestCSVParser.java Right-click the link and save the file and then move to the same project source folder as CSVParser.java.

Use the test bench by uncommenting the appropriate test method in main and then run TestCSVParser. The testing methods in TestCSVParser call the methods in CSVParser.

In this part of P7, implement the method with header:

public static String[] separate(String text, char delimiter, char qualifier)

Carefully read and implement according to the method header description. Using a qualifier allows us to have the delimiter character within a field value. Essentially, the specified qualifier is at the beginning and end of each field value that may contain the delimiter character.

In this part of P7, implement the method with header:

public static String[] separate(String text, char delimiter, char qualifier, boolean keepQualifiers)

Carefully read and implement according to the method header description. Essentially, the keepQualifiers parameter indicates whether field values should be returned with the qualifier characters or without.

Here is the given code:

//FIXME Add your own file header comment here /** * This class contains methods to parse text, specifically intended to eventually parse CSV (comma separated values) * files. * * Definitions of Terms: * delimiter: The character used to specify the boundary between fields in a sequence of characters. * for example, the comma would be the delimiter between the fields: * name, id, section * Note the field values include the spaces. In general, the field value is every character except * for the delimiter. * * qualifier: If a field value contains a delimiter such as a comma with the name field: * John Doe, MD, 1234567, 321 * then a qualifier, such as ", is placed around a field value to indicate it is the same field. * for example: * "John Doe, MD", 1234567, 321 * If the qualifier itself is a part of the field value then the qualifier is duplicated. * for example for the field value: * H. Jackson Brown, Jr. said "The best preparation for tomorrow is doing your best today." * would be enclosed with " and internal quotes duplicated resulting in the qualified field value: * "H. Jackson Brown, Jr. said ""The best preparation for tomorrow is doing your best today.""" * * A example with , as delimiter and " as qualifier with a newline in a field value should be * processed as follows: * "This is a line of text.",bbb,ccc * would have 3 fields * "This is a line of text." * bbb * ccc * * This project is derived from RFC 4180: https://tools.ietf.org/html/rfc4180 * */ public class CSVParser { /** * This method returns the array of string containing the field values. * The field values in text are identified using , as the delimiter. * Qualifiers are not considered at all in the parsing of text. * * Example: * aaa,bbb,ccc * should result in an array with 3 fields * aaa * bbb * ccc * * aaa,bbb, * should also result in an array with 3 fields with the 3rd field containing either whitespace or no spaces * depending on the actual characters after the last ,. * * If text is null then a zero length array is returned. If text is non-null * but no delimiters are found then a single length array is returned with the text as the field value. * * @param text A sequence of characters that may include , as a delimiter. * @return An array of String containing each field value. The size of the * array is the number of fields found. */ public static String[] separate(String text) { //algorithm: //determine the number of fields by counting the number of , in the text string. //create an array of String for the number of fields //add each field value to the corresponding array index. //return the array of field values return null; //FIXME in Part1 } /** * This method is the same as separate(String text) except that any character can be used as the delimiter * specified as a parameter. In this method, qualifiers are not considered at all in the parsing of text. * * Example: * aaa,bbb,ccc ddd,eee,fff * with as the delimiter should result in an array with 2 fields * aaa,bbb,ccc * ddd,eee,fff * * @param text A sequence of characters. * @param delimiter The character that separates field values in text. * @return An array of String containing each field value. The size of the * array is the number of fields found. * */ public static String[] separate(String text, char delimiter) { //revise your code from the previous method to use the character passed in the delimiter //parameter rather than using ','. return null; //FIXME in Part1 } /** * This method extends the previous separate methods in that qualifiers are now considered. See the class * header comment for examples of qualifier. Qualifiers are kept as a part of the field values. * * Example: * "H. Jackson Brown, Jr. said ""The best preparation for tomorrow is doing your best today.""",bbb * With delimiter , and qualifier " would result in the following field values: * "H. Jackson Brown, Jr. said ""The best preparation for tomorrow is doing your best today.""" * bbb * * @param text A sequence of characters. * @param delimiter The character that separates field values in text. * @param qualifier The character indicating the beginning and ending of the field value such * that delimiters could be within a field value. * @return An array of String containing each field value. The size of the * array is the number of fields found. * */ public static String[] separate(String text, char delimiter, char qualifier) { return null; //FIXME in Part2 } /** * This method extends the previous by adding the parameter keepQualifiers. If keepQualifiers is true * the returned field values include the qualifier characters. If keepQualifiers is false then the * returned field values have the qualifier characters removed. * * Example: * "H. Jackson Brown, Jr. said ""The best preparation for tomorrow is doing your best today.""", bbb * With delimiter , and qualifier " and keepQualifiers false would result in the following field values: * H. Jackson Brown, Jr. said "The best preparation for tomorrow is doing your best today." * bbb * * @param text A sequence of characters. * @param delimiter The character that separates field values in text. * @param qualifier The character indicating the beginning and ending of the field value such * that delimiters could be within a field value. * @param keepQualifiers true to keep qualifiers, false to remove qualifiers * @return An array of String containing each field value. The size of the * array is the number of fields found. */ public static String[] separate(String text, char delimiter, char qualifier, boolean keepQualifiers) { return null; //FIXME in Part3 } }

Here is the test code:

/** * This file contains testing methods for the CSVParser project. * These methods are intended to serve several purposes: * 1) provide an example of a way to incrementally test your code * 2) provide example method calls for the various methods in CSVParser * 3) provide examples of creating and accessing arrays */ import java.util.Arrays; /** * This class contains methods for testing CSVParser methods as they are developed or modified. * These methods are all private as they are only intended for use within this class. * * @author Jim Williams * @author FIXME add your name here if you modify or extend the tests * */ public class TestCSVParser { /** * This is the main method that runs the various tests. Uncomment the tests * when you are ready for them to run. * * @param args (unused) */ public static void main(String[] args) { testParserPart1(); // testParserPart2(); // testParserPart3(); } /** * A testing method for part 1 of CSV Parser project * Part 1 implementation separates based on comma and then generalizes to any character, but does not consider " * or any qualifier characters. */ private static void testParserPart1() { boolean error = false; String input = null; String[] expectedResult = new String[0]; String[] actualResult = CSVParser.separate(input); if (checkForError("testParserPart1.1", expectedResult, actualResult)) { error = true; } input = ""; expectedResult = new String[] {""}; actualResult = CSVParser.separate(input); if (checkForError("testParserPart1.2", expectedResult, actualResult)) { error = true; } input = " a "; expectedResult = new String[] {" a "}; actualResult = CSVParser.separate(input); if (checkForError("testParserPart1.3", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,ccc"; expectedResult = new String[] {"aaa", "bbb", "ccc"}; actualResult = CSVParser.separate(input); if (checkForError("testParserPart1.4", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,"; expectedResult = new String[] {"aaa", "bbb", ""}; actualResult = CSVParser.separate(input); if (checkForError("testParserPart1.5", expectedResult, actualResult)) { error = true; } input = " aa a, bbb , cc c "; expectedResult = new String[] {" aa a", " bbb ", " cc c "}; actualResult = CSVParser.separate(input); if (checkForError("testParserPart1.6", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,ccc zzz,yyy,xxx"; expectedResult = new String[] {"aaa,bbb,ccc", "zzz,yyy,xxx"}; actualResult = CSVParser.separate(input, ' '); if (checkForError("testParserPart1.7", expectedResult, actualResult)) { error = true; } if (error) { System.err.println("testParserPart1 failed"); } else { System.out.println("testParserPart1 passed"); } } /** * A testing method for part 2 of CSV Parser project * Part 2 methods add a qualifier, such as ", so that delimiter characters can be within field values. * */ private static void testParserPart2() { boolean error = false; String input = null; String[] expectedResult = new String[0]; String[] actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.1", expectedResult, actualResult)) { error = true; } input = ""; expectedResult = new String[] {""}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.2", expectedResult, actualResult)) { error = true; } input = " a "; expectedResult = new String[] {" a "}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.3", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,ccc"; expectedResult = new String[] {"aaa", "bbb", "ccc"}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.4", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,"; expectedResult = new String[] {"aaa", "bbb", ""}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.5", expectedResult, actualResult)) { error = true; } input = " aa a, bbb , cc c "; expectedResult = new String[] {" aa a", " bbb ", " cc c "}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.6", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,ccc zzz,yyy,xxx"; expectedResult = new String[] {"aaa,bbb,ccc", "zzz,yyy,xxx"}; actualResult = CSVParser.separate(input, ' ', '"'); if (checkForError("testParserPart2.7", expectedResult, actualResult)) { error = true; } input = "field_name,field_name,field_name aaa,bbb,ccc zzz,yyy,xxx"; expectedResult = new String[] {"field_name,field_name,field_name", "aaa,bbb,ccc", "zzz,yyy,xxx"}; actualResult = CSVParser.separate(input, ' ', '"'); if (checkForError("testParserPart2.8", expectedResult, actualResult)) { error = true; } input = "\"aaa\",\"bbb\",\"ccc\""; // recall in Java, to have " within String literals we // have to precede with \ expectedResult = new String[] {"\"aaa\"", "\"bbb\"", "\"ccc\""}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.9", expectedResult, actualResult)) { error = true; } input = "\"a, aa\",\"b ,bb\",\"cc , c\""; expectedResult = new String[] {"\"a, aa\"", "\"b ,bb\"", "\"cc , c\""}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.10", expectedResult, actualResult)) { error = true; } input = "\"a\"\",aa\",\"b ,\"\"bb\",\"cc , c\""; expectedResult = new String[] {"\"a\"\",aa\"", "\"b ,\"\"bb\"", "\"cc , c\""}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.11", expectedResult, actualResult)) { error = true; } input = "\"aaa\",\"b bb\",\"ccc\""; expectedResult = new String[] {"\"aaa\"", "\"b bb\"", "\"ccc\""}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.12", expectedResult, actualResult)) { error = true; } input = "\"John Doe, MD\", 1234567, 321"; expectedResult = new String[] {"\"John Doe, MD\"", " 1234567", " 321"}; actualResult = CSVParser.separate(input, ',', '"'); if (checkForError("testParserPart2.13", expectedResult, actualResult)) { error = true; } if (error) { System.err.println("testParserPart2 failed"); } else { System.out.println("testParserPart2 passed"); } } /** * A testing method for part 3 of CSV Parser project * Part 3 methods add a field keepQualifiers that specify whether the field values should * contain the qualifier characters or not. * */ private static void testParserPart3() { boolean error = false; String input = null; String[] expectedResult = new String[0]; String[] actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.1", expectedResult, actualResult)) { error = true; } input = ""; expectedResult = new String[] {""}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.2", expectedResult, actualResult)) { error = true; } input = " a "; expectedResult = new String[] {" a "}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.3", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,ccc"; expectedResult = new String[] {"aaa", "bbb", "ccc"}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.4", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,"; expectedResult = new String[] {"aaa", "bbb", ""}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.5", expectedResult, actualResult)) { error = true; } input = " aa a, bbb , cc c "; expectedResult = new String[] {" aa a", " bbb ", " cc c "}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.6", expectedResult, actualResult)) { error = true; } input = "aaa,bbb,ccc zzz,yyy,xxx"; expectedResult = new String[] {"aaa,bbb,ccc", "zzz,yyy,xxx"}; actualResult = CSVParser.separate(input, ' ', '"', false); if (checkForError("testParserPart3.7", expectedResult, actualResult)) { error = true; } input = "field_name,field_name,field_name aaa,bbb,ccc zzz,yyy,xxx"; expectedResult = new String[] {"field_name,field_name,field_name", "aaa,bbb,ccc", "zzz,yyy,xxx"}; actualResult = CSVParser.separate(input, ' ', '"', false); if (checkForError("testParserPart3.8", expectedResult, actualResult)) { error = true; } input = "\"aaa\",\"bbb\",\"ccc\""; // recall in Java, to have " within String literals we // have to precede with \ expectedResult = new String[] {"\"aaa\"", "\"bbb\"", "\"ccc\""}; actualResult = CSVParser.separate(input, ',', '"', true); if (checkForError("testParserPart3.9T", expectedResult, actualResult)) { error = true; } input = "\"aaa\",\"bbb\",\"ccc\""; // recall in Java, to have " within String literals we // have to precede with \ expectedResult = new String[] {"aaa", "bbb", "ccc"}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.9F", expectedResult, actualResult)) { error = true; } input = "\"a, aa\",\"b ,bb\",\"cc , c\""; expectedResult = new String[] {"\"a, aa\"", "\"b ,bb\"", "\"cc , c\""}; actualResult = CSVParser.separate(input, ',', '"', true); if (checkForError("testParserPart3.10T", expectedResult, actualResult)) { error = true; } input = "\"a, aa\",\"b ,bb\",\"cc , c\""; expectedResult = new String[] {"a, aa", "b ,bb", "cc , c"}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.10F", expectedResult, actualResult)) { error = true; } input = "\"a\"\",aa\",\"b ,\"\"bb\",\"cc , c\""; expectedResult = new String[] {"\"a\"\",aa\"", "\"b ,\"\"bb\"", "\"cc , c\""}; actualResult = CSVParser.separate(input, ',', '"', true); if (checkForError("testParserPart3.11T", expectedResult, actualResult)) { error = true; } input = "\"a\"\",aa\",\"b ,\"\"bb\",\"cc , c\""; expectedResult = new String[] {"a\",aa", "b ,\"bb", "cc , c"}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.11F", expectedResult, actualResult)) { error = true; } input = "\"aaa\",\"b bb\",\"ccc\""; expectedResult = new String[] {"\"aaa\"", "\"b bb\"", "\"ccc\""}; actualResult = CSVParser.separate(input, ',', '"', true); if (checkForError("testParserPart3.12T", expectedResult, actualResult)) { error = true; } input = "\"aaa\",\"b bb\",\"ccc\""; expectedResult = new String[] {"aaa", "b bb", "ccc"}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.12F", expectedResult, actualResult)) { error = true; } input = "\"John Doe, MD\", 1234567, 321"; expectedResult = new String[] {"\"John Doe, MD\"", " 1234567", " 321"}; actualResult = CSVParser.separate(input, ',', '"', true); if (checkForError("testParserPart3.13T", expectedResult, actualResult)) { error = true; } input = "\"John Doe, MD\", 1234567, 321"; expectedResult = new String[] {"John Doe, MD", " 1234567", " 321"}; actualResult = CSVParser.separate(input, ',', '"', false); if (checkForError("testParserPart3.13F", expectedResult, actualResult)) { error = true; } if (error) { System.err.println("testParserPart3 failed"); } else { System.out.println("testParserPart3 passed"); } } /** * A supporting test method that compares the expected and actual results of calling a method. * This method returns true if a test fails and false if the test case succeeds. * * @param testName The name of the test to include in the output * @param expected The expected return value from the separate method. * @param actual The actual return value from the separate method. * @return true if error, false if no error detected. */ private static boolean checkForError( String testName, String[] expected, String[] actual) { boolean error = false; if (expected == null || actual == null) { System.err.println( testName + "a: actual=" + (actual == null ? "null" : Arrays.toString(actual)) + " expected=" + (expected == null ? "null" : Arrays.toString(expected))); error = true; } else if (expected.length != actual.length) { System.err.println(testName + "b: actual=" + Arrays.toString(actual) + " expected=" + Arrays.toString(expected)); error = true; } for (int i = 0; !error && i < expected.length; i++) { if (!expected[i].equals(actual[i])) { error = true; System.err.println(testName + "c: actual[" + i + "]=" + actual[i] + " expected[" + i + "]=" + expected[i]); } } return error; } }