Replace enums with charsequence sub classes

src/main/java/de/vanitasvitae/imi/codes/BoundedCharSequence.java

@@ -0,0 +1,63 @@
+package de.vanitasvitae.imi.codes;
+
+import java.util.regex.Pattern;
+import java.util.stream.IntStream;
+
+public abstract class BoundedCharSequence implements CharSequence {
+
+    private final Pattern regex;
+    private final String value;
+
+    protected BoundedCharSequence(Pattern regex, String value) throws InvalidOptionException {
+        this.regex = regex;
+        if (!matchPattern(value)) {
+            throw new InvalidOptionException("Invalid input.");
+        }
+        this.value = value;
+    }
+
+    private boolean matchPattern(String input) {
+        return regex.matcher(input).matches();
+    }
+
+    @Override
+    public int length() {
+        return value.length();
+    }
+
+    @Override
+    public char charAt(int i) {
+        return value.charAt(i);
+    }
+
+    @Override
+    public CharSequence subSequence(int a, int b) {
+        return value.subSequence(a, b);
+    }
+
+    @Override
+    public IntStream chars() {
+        return value.chars();
+    }
+
+    @Override
+    public IntStream codePoints() {
+        return value.codePoints();
+    }
+
+    @Override
+    public int hashCode() {
+        return value.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        BoundedCharSequence b = (BoundedCharSequence) o;
+        return toString().equals(b.toString());
+    }
+
+    @Override
+    public String toString() {
+        return value;
+    }
+}

src/main/java/de/vanitasvitae/imi/codes/InputValidator.java

@@ -9,16 +9,6 @@ public class InputValidator {
     public static final String REGEX_ALPHABET = "[a-zA-Z0-9]";
     public static final String ALPHABET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 
-    /*
-    REGEX pattern for study numbers. Allowed are all 3-letter numbers from the alphabet [a-zA-Z0-9].
-     */
-    private static final Pattern STUDY_NUMBER_MATCHER = Pattern.compile(REGEX_ALPHABET +"{3}");
-
-    /*
-    REGEX pattern for sample numbers. Allowed are four-letter numbers from the alphabet [a-zA-Z0-9].
-     */
-    private static final Pattern SAMPLE_NUMBER_MATCHER = Pattern.compile(REGEX_ALPHABET +"{4}");
-
     /**
      * Validate a given study number. Valid study numbers are 3-letter codes from the alphabet [a-zA-Z0-9].
      *
@@ -27,12 +17,8 @@ public class InputValidator {
      *
      * @throws InvalidOptionException if the input String doesn't match the regex.
      */
-    public static String validateStudyNumber(String in) throws InvalidOptionException {
-        if (!STUDY_NUMBER_MATCHER.matcher(in).matches()) {
-            throw new InvalidOptionException("Study number must be a three digit number from the alphabet [a-zA-Z0-9].");
-        }
-
-        return in;
+    public static StudyNumber validateStudyNumber(String in) throws InvalidOptionException {
+        return new StudyNumber(in);
     }
 
     /**
@@ -45,12 +31,7 @@ public class InputValidator {
      * @throws NullPointerException in case the given String is {@code null}.
      */
     public static SampleType validateSampleType(String in) throws InvalidOptionException {
-        try {
-            return SampleType.getEnum(in);
-        } catch (IllegalArgumentException e) {
-            String message = "Invalid sample type \"" + in + "\".";
-            throw new InvalidOptionException(message, e);
-        }
+        return new SampleType(in);
     }
 
     /**

src/main/java/de/vanitasvitae/imi/codes/Main.java

@@ -35,7 +35,7 @@ public class Main {
         }
 
         // Parse arguments
-        String studyNumber;
+        StudyNumber studyNumber;
         SampleType sampleType;
         int numberOfCodes;
         File outputPath;
@@ -58,7 +58,7 @@ public class Main {
                 + " output: " + outputPath + " browser: " + externalBrowser);
 
         for (int i = 0; i < numberOfCodes; i++) {
-            System.out.format("%s%04d%n", studyNumber + sampleType, i);
+            System.out.format("%s%04d%n", studyNumber.toString() + sampleType, i);
         }
     }
 

src/main/java/de/vanitasvitae/imi/codes/SampleType.java

@@ -1,62 +1,22 @@
 package de.vanitasvitae.imi.codes;
 
-public enum SampleType {
+import java.util.regex.Pattern;
 
-    // Hard coded values. Prepended with an underscore to allow numeric values (eg. _2).
-    _b('b', "Blood"),
-    _u('u', "Urine"),
-    ;
+/**
+ * Sub-class of {@link CharSequence}, which can only represent char sequences of length 1 from the alphabet [a-zA-Z0-9].
+ */
+public class SampleType extends BoundedCharSequence {
 
-    // Members of the enum
-
-    private final char name;
-    private final String description;
+    private static final Pattern REGEX = Pattern.compile(InputValidator.REGEX_ALPHABET);
 
     /**
-     * Create a SampleType enum which is described by a name (one letter from the alphabet [a-zA-Z0-9]) and a
-     * human readable description.
+     * Create a new {@link SampleType} sequence. The constructor checks, whether the input String is of length 1 and from
+     * the alphabet [a-zA-Z9-0].
      *
-     * @param name one letter name
-     * @param description description
+     * @param value input string
+     * @throws InvalidOptionException if the input doesn't match the regex.
      */
-    SampleType(char name, String description) {
-        this.name = name;
-        this.description = description;
-    }
-
-    /**
-     * Override {@link Enum#toString()} in order to return the name of the enum instead of its value.
-     *
-     * @return name
-     */
-    @Override
-    public String toString() {
-        return "" + name;
-    }
-
-    /**
-     * Return the human readable description of the enum.
-     */
-    public String getDescription() {
-        return description;
-    }
-
-    /**
-     * Replacement method for {@link #valueOf(String)}. You MUST use this method instead, as we have to escape
-     * the names of the enums with a underscore in order to allow for numerals to be used as enum name (for example "_0").
-     * This method takes a string value (eg. "u") and returns the corresponding enum ("_u").
-     *
-     * @param name name of the enum without an underscore.
-     * @return enum corresponding to the name.
-     *
-     * @throws IllegalArgumentException if no matching enum was found.
-     */
-    public static SampleType getEnum(String name) {
-        for (SampleType s : SampleType.values()) {
-            if (s.toString().equals(name)) {
-                return s;
-            }
-        }
-        throw new IllegalArgumentException("No SampleType found for name \"" + name + "\".");
+    public SampleType(String value) throws InvalidOptionException {
+        super(REGEX, value);
     }
 }

src/main/java/de/vanitasvitae/imi/codes/StudyNumber.java

@@ -0,0 +1,22 @@
+package de.vanitasvitae.imi.codes;
+
+import java.util.regex.Pattern;
+
+/**
+ * Sub-class of {@link CharSequence}, which can only represent char sequences of length 3 from the alphabet [a-zA-Z0-9].
+ */
+public class StudyNumber extends BoundedCharSequence {
+
+    private static final Pattern REGEX = Pattern.compile(InputValidator.REGEX_ALPHABET + "{3}");
+
+    /**
+     * Create a new {@link StudyNumber} sequence. The constructor checks, whether the input String is of length 3 and from
+     * the alphabet [a-zA-Z9-0].
+     *
+     * @param value input string
+     * @throws InvalidOptionException if the input doesn't match the regex
+     */
+    protected StudyNumber(String value) throws InvalidOptionException {
+        super(REGEX, value);
+    }
+}

src/test/java/de/vanitasvitae/imi/codes/InputValidatorTest.java

@@ -2,6 +2,8 @@ package de.vanitasvitae.imi.codes;
 
 import static junit.framework.TestCase.assertEquals;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Random;
 
 import org.junit.Test;
@@ -19,7 +21,7 @@ public class InputValidatorTest {
     public void testValidateStudyNumber() throws InvalidOptionException {
         String in = generateTestStringOfLength(3);
         assertEquals("validateStudyNumber must accept valid three digit inputs from the alphabet [a-zA-Z0-9].",
-                in, InputValidator.validateStudyNumber(in));
+                new StudyNumber(in), InputValidator.validateStudyNumber(in));
     }
 
     /**
@@ -84,24 +86,15 @@ public class InputValidatorTest {
      */
     @Test
     public void testValidateSampleType() throws InvalidOptionException {
-        for (SampleType t : SampleType.values()) {
+        List<SampleType> sampleSampleTypes = new ArrayList<>();
+        sampleSampleTypes.add(new SampleType("u"));
+        sampleSampleTypes.add(new SampleType("b"));
+        for (SampleType t : sampleSampleTypes) {
             assertEquals("validateSampleType didn't return expected value for input \"" + t.toString() + "\"",
                     t, InputValidator.validateSampleType(t.toString()));
         }
     }
 
-    /**
-     * Test, whether {@link InputValidator#validateSampleType(String)} throws a {@link InvalidOptionException} for
-     * unknown sample types (in this case {@code x}).
-     *
-     * @throws InvalidOptionException expected
-     */
-    @Test(expected = InvalidOptionException.class)
-    public void testValidateSampleTypeFailsForUnknownInputs() throws InvalidOptionException {
-        // -> InvalidOptionException
-        InputValidator.validateSampleType("x");
-    }
-
     /**
      * Test, whether {@link InputValidator#validateNumberOfCodes(String)} returns the expected {@link Integer}.
      * In this method, posit

src/test/java/de/vanitasvitae/imi/codes/SampleTypeTest.java

@@ -1,39 +0,0 @@
-package de.vanitasvitae.imi.codes;
-
-import static junit.framework.TestCase.assertEquals;
-import static junit.framework.TestCase.assertTrue;
-
-import java.util.regex.Pattern;
-
-import org.junit.Test;
-
-/**
- * Test functionality of the {@link SampleType} enum.
- */
-public class SampleTypeTest {
-
-    private static final Pattern SAMPLE_TYPE_VALUE_PATTERN = Pattern.compile(InputValidator.REGEX_ALPHABET);
-
-    /**
-     * Test, whether all {@link SampleType} names are of length 1 and from the alphabet [a-zA-Z0-9].
-     */
-    @Test
-    public void testSampleTypeNames() {
-        for (SampleType t : SampleType.values()) {
-            assertTrue("SampleType value names must be one letter from the alphabet [a-zA-Z0-9].",
-                    SAMPLE_TYPE_VALUE_PATTERN.matcher(t.toString()).matches());
-        }
-    }
-
-    /**
-     * Test, whether {@link SampleType#getEnum(String)} correctly maps {@link SampleType#name} to the corresponding
-     * values.
-     */
-    @Test
-    public void testGetEnum() {
-        for (SampleType t : SampleType.values()) {
-            assertEquals("getEnum must return the SampleType, which corresponds to the given name.",
-                    t, SampleType.getEnum(t.toString()));
-        }
-    }
-}