added common lib and added service uri's to properties file

common/src/main/java/ch/unisg/common/exception/ErrorResponse.java

@@ -0,0 +1,13 @@
+package ch.unisg.common.exception;
+
+import org.springframework.http.HttpStatus;
+
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+
+@Data
+@RequiredArgsConstructor
+public class ErrorResponse {
+    private final HttpStatus httpStatus;
+    private final String message;
+}

common/src/main/java/ch/unisg/common/exception/InvalidExecutorURIException.java

@@ -0,0 +1,7 @@
+package ch.unisg.common.exception;
+
+public class InvalidExecutorURIException extends Exception {
+    public InvalidExecutorURIException() {
+        super("URI is invalid");
+    }
+}

common/src/main/java/ch/unisg/common/validation/SelfValidating.java

@@ -0,0 +1,31 @@
+package ch.unisg.common.validation;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.ConstraintViolationException;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import javax.validation.ValidatorFactory;
+import java.util.Set;
+
+public abstract class SelfValidating<T> {
+
+    private Validator validator;
+
+    protected SelfValidating() {
+        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
+        validator = factory.getValidator();
+    }
+
+    /**
+     * Evaluates all Bean Validations on the attributes of this
+     * instance.
+     */
+    protected void validateSelf() {
+        @SuppressWarnings("unchecked")
+        Set<ConstraintViolation<T>> violations = validator.validate((T) this);
+        if (!violations.isEmpty()) {
+            throw new ConstraintViolationException(violations);
+        }
+    }
+}
+

common/src/main/java/ch/unisg/common/valueobject/ExecutorURI.java

@@ -0,0 +1,18 @@
+package ch.unisg.common.valueobject;
+
+import ch.unisg.common.exception.InvalidExecutorURIException;
+import lombok.Value;
+
+@Value
+public class ExecutorURI {
+    private String value;
+
+    public ExecutorURI(String uri) throws InvalidExecutorURIException {
+        if (uri.equalsIgnoreCase("localhost") ||
+            uri.matches("^((25[0-5]|(2[0-4]|1\\d|[1-9]|)\\d)(\\.(?!$)|$)){4}$")) {
+            this.value = uri;
+        } else {
+            throw new InvalidExecutorURIException();
+        }
+    }
+}