initial commit

utilities/build.gradle

@@ -0,0 +1,8 @@
+plugins {
+    id 'myproject.java-conventions'
+    id 'java-library'
+}
+
+dependencies {
+    api project(':list')
+}

utilities/src/main/java/module-info.java

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+module org.gradle.sample.utilities {
+    requires transitive org.gradle.sample.list;
+    exports org.gradle.sample.utilities;
+}

utilities/src/main/java/org/gradle/sample/utilities/JoinUtils.java

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+package org.gradle.sample.utilities;
+
+import org.gradle.sample.list.LinkedList;
+
+class JoinUtils {
+    public static String join(LinkedList source) {
+        StringBuilder result = new StringBuilder();
+        for (int i = 0; i < source.size(); ++i) {
+            if (result.length() > 0) {
+                result.append(" ");
+            }
+            result.append(source.get(i));
+        }
+
+        return result.toString();
+    }
+}

utilities/src/main/java/org/gradle/sample/utilities/SplitUtils.java

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+package org.gradle.sample.utilities;
+
+import org.gradle.sample.list.LinkedList;
+
+class SplitUtils {
+    public static LinkedList split(String source) {
+        int lastFind = 0;
+        int currentFind = 0;
+        LinkedList result = new LinkedList();
+
+        while ((currentFind = source.indexOf(" ", lastFind)) != -1) {
+            String token = source.substring(lastFind);
+            if (currentFind != -1) {
+                token = token.substring(0, currentFind - lastFind);
+            }
+
+            addIfValid(token, result);
+            lastFind = currentFind + 1;
+        }
+
+        String token = source.substring(lastFind);
+        addIfValid(token, result);
+
+        return result;
+    }
+
+    private static void addIfValid(String token, LinkedList list) {
+        if (isTokenValid(token)) {
+            list.add(token);
+        }
+    }
+
+    private static boolean isTokenValid(String token) {
+        return !token.isEmpty();
+    }
+}

utilities/src/main/java/org/gradle/sample/utilities/StringUtils.java

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+package org.gradle.sample.utilities;
+
+import org.gradle.sample.list.LinkedList;
+
+public class StringUtils {
+    public static String join(LinkedList source) {
+        return JoinUtils.join(source);
+    }
+
+    public static LinkedList split(String source) {
+        return SplitUtils.split(source);
+    }
+}