StorageService.java

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package org.glassfish.jersey.examples.beanvalidation.webapp.service;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

import org.glassfish.jersey.examples.beanvalidation.webapp.domain.ContactCard;

/**
 * Simple storage of contacts.
 *
 * @author Michal Gajdos
 */
public class StorageService {

    private static final AtomicLong contactCounter = new AtomicLong(0);
    private static final Map<Long, ContactCard> contacts = new HashMap<Long, ContactCard>();

    /**
     * Adds a contact into the storage. If a contact with given data already exist {@code null} value is returned.
     *
     * @param contact contact to be added.
     * @return contact with pre-filled {@code id} field, {@code null} if the contact already exist in the storage.
     */
    public static ContactCard addContact(final ContactCard contact) {
        if (contacts.containsValue(contact)) {
            return null;
        }

        contact.setId(contactCounter.incrementAndGet());
        contacts.put(contact.getId(), contact);

        return contact;
    }

    /**
     * Removes all contacts from the storage.
     *
     * @return list of all removed contacts.
     */
    public static List<ContactCard> clear() {
        final Collection<ContactCard> values = contacts.values();
        contacts.clear();
        return new ArrayList<ContactCard>(values);
    }

    /**
     * Removes contact with given {@code id}.
     *
     * @param id id of the contact to be removed.
     * @return removed contact or {@code null} if the contact is not present in the storage.
     */
    public static ContactCard remove(final Long id) {
        return contacts.remove(id);
    }

    /**
     * Retrieves contact with given {@code id}.
     *
     * @param id id of the contact to be retrieved.
     * @return contact or {@code null} if the contact is not present in the storage.
     */
    public static ContactCard get(final Long id) {
        return contacts.get(id);
    }

    /**
     * Finds contacts whose email contains {@code emailPart} as a substring.
     *
     * @param emailPart search phrase.
     * @return list of matched contacts or an empty list.
     */
    public static List<ContactCard> findByEmail(final String emailPart) {
        final List<ContactCard> results = new ArrayList<ContactCard>();

        for (final ContactCard contactCard : contacts.values()) {
            final String email = contactCard.getEmail();
            if (email != null && email.contains(emailPart)) {
                results.add(contactCard);
            }
        }

        return results;
    }

    /**
     * Finds contacts whose name contains {@code namePart} as a substring.
     *
     * @param namePart search phrase.
     * @return list of matched contacts or an empty list.
     */
    public static List<ContactCard> findByName(final String namePart) {
        final List<ContactCard> results = new ArrayList<ContactCard>();

        for (final ContactCard contactCard : contacts.values()) {
            if (contactCard.getFullName().contains(namePart)) {
                results.add(contactCard);
            }
        }

        return results;
    }

    /**
     * Finds contacts whose phone contains {@code phonePart} as a substring.
     *
     * @param phonePart search phrase.
     * @return list of matched contacts or an empty list.
     */
    public static List<ContactCard> findByPhone(final String phonePart) {
        final List<ContactCard> results = new ArrayList<ContactCard>();

        for (final ContactCard contactCard : contacts.values()) {
            final String phone = contactCard.getPhone();
            if (phone != null && phone.contains(phonePart)) {
                results.add(contactCard);
            }
        }

        return results;
    }
}