fix boot 2 upgrade, rename package

spring-rest-query-language/src/main/java/com/baeldung/persistence/dao/UserSpecification.java

@@ -0,0 +1,50 @@
+package com.baeldung.persistence.dao;
+
+import org.springframework.data.jpa.domain.Specification;
+
+import com.baeldung.persistence.model.User;
+import com.baeldung.web.util.SpecSearchCriteria;
+
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Predicate;
+import javax.persistence.criteria.Root;
+
+public class UserSpecification implements Specification<User> {
+
+	private SpecSearchCriteria criteria;
+
+	public UserSpecification(final SpecSearchCriteria criteria) {
+		super();
+		this.criteria = criteria;
+	}
+
+	public SpecSearchCriteria getCriteria() {
+		return criteria;
+	}
+
+	@Override
+	public Predicate toPredicate(final Root<User> root, final CriteriaQuery<?> query, final CriteriaBuilder builder) {
+		switch (criteria.getOperation()) {
+		case EQUALITY:
+			return builder.equal(root.get(criteria.getKey()), criteria.getValue());
+		case NEGATION:
+			return builder.notEqual(root.get(criteria.getKey()), criteria.getValue());
+		case GREATER_THAN:
+			return builder.greaterThan(root.get(criteria.getKey()), criteria.getValue().toString());
+		case LESS_THAN:
+			return builder.lessThan(root.get(criteria.getKey()), criteria.getValue().toString());
+		case LIKE:
+			return builder.like(root.get(criteria.getKey()), criteria.getValue().toString());
+		case STARTS_WITH:
+			return builder.like(root.get(criteria.getKey()), criteria.getValue() + "%");
+		case ENDS_WITH:
+			return builder.like(root.get(criteria.getKey()), "%" + criteria.getValue());
+		case CONTAINS:
+			return builder.like(root.get(criteria.getKey()), "%" + criteria.getValue() + "%");
+		default:
+			return null;
+		}
+	}
+
+}