TodoPredicates.java

package net.petrikainulainen.springdata.jpa.todo;

import com.mysema.query.types.Predicate;

/**
 * This predicate builder class provides static methods that are used
 * to create <code>Predicate</code> objects which specify
 * the search criteria of dynamic database queries.
 *
 * @author Petri Kainulainen
 */
final class TodoPredicates {

    /**
     * Prevent instantiation
     */
    private TodoPredicates() {}

    /**
     * Creates the search criteria that returns all todo entries whose title or description
     * contains the given search term. The search is case insensitive.
     *
     * If the search term is <code>null</code> or empty, the created search criteria will return
     * all todo entries.
     *
     * @param searchTerm The used search term.
     * @return
     */
    static Predicate  titleOrDescriptionContainsIgnoreCase(String searchTerm) {
        if (searchTerm == null || searchTerm.isEmpty()) {
            return QTodo.todo.isNotNull();
        }
        else {
            return QTodo.todo.description.containsIgnoreCase(searchTerm)
                    .or(QTodo.todo.title.containsIgnoreCase(searchTerm));
        }
    }
}