User.java

package gwt.material.design.demo.client.application.addins.autocomplete.base;

import java.io.Serializable;

public class User implements Serializable {

    public enum Position {
        CEO("CEO"),
        CTO("CTO"),
        DEVELOPER("Developer"),
        MARKETING("Marketing");

        private final String value;

        Position(String value) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }
    }

    private String picture;

    private String name;
    private String email;
    private String password;

    private String address;
    private String contactNo;

    private String company;
    private boolean starred;

    private Position position;

    public User() {}

    public User(String picture, Position position, boolean starred, String name, String email, String password, String contactNo, String address, String company) {
        this.picture = picture;
        this.position = position;
        this.starred = starred;
        this.name = name;
        this.email = email;
        this.password = password;
        this.contactNo = contactNo;
        this.address = address;
        this.company = company;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getCompany() {
        return company;
    }

    public void setCompany(String company) {
        this.company = company;
    }

    public String getContactNo() {
        return contactNo;
    }

    public void setContactNo(String contactNo) {
        this.contactNo = contactNo;
    }

    public boolean isStarred() {
        return starred;
    }

    public void setStarred(boolean starred) {
        this.starred = starred;
    }

    public String getPicture() {
        return picture;
    }

    public void setPicture(String picture) {
        this.picture = picture;
    }

    public Position getPosition() {
        return position;
    }

    public void setPosition(Position position) {
        this.position = position;
    }
}

UserOracle.java

package gwt.material.design.demo.client.application.addins.autocomplete.base;

import gwt.material.design.addins.client.autocomplete.base.MaterialSuggestionOracle;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class UserOracle extends MaterialSuggestionOracle{

    private List<User> contacts = new LinkedList<>();

    public void addContacts(List<User> users) {
        contacts.addAll(users);
    }

    @Override
    public void requestSuggestions(Request request, Callback callback) {
        Response resp = new Response();
        if(contacts.isEmpty()){
            callback.onSuggestionsReady(request, resp);
            return;
        }
        String text = request.getQuery();
        text = text.toLowerCase();

        List<UserSuggestion> list = new ArrayList<>();

        for(User contact : contacts){
            if(contact.getName().toLowerCase().contains(text)){
                list.add(new UserSuggestion(contact));
            }
        }
        resp.setSuggestions(list);
        callback.onSuggestionsReady(request, resp);
    }
}

UserSuggestion.java

package gwt.material.design.demo.client.application.addins.autocomplete.base;

import com.google.gwt.user.client.ui.SuggestOracle;

public class UserSuggestion implements SuggestOracle.Suggestion {

    private User user;

    public UserSuggestion(User user) {
        this.user = user;
    }

    @Override
    public String getDisplayString() {
        return getReplacementString();
    }

    @Override
    public String getReplacementString() {
        return user.getName();
    }

    public User getUser() {
        return user;
    }
}