How to use view model

[james agada]

I have created a view model (below). It is not clear to me how to either
get it to display.

*

 *  Copyright 2012-2013 Eurocommercial Properties NV

 *

 *

 *  Licensed under the Apache License, Version 2.0 (the

 *  "License"); you may not use this file except in compliance

 *  with the License.  You may obtain a copy of the License at

 *

 *        http://www.apache.org/licenses/LICENSE-2.0

 *

 *  Unless required by applicable law or agreed to in writing,

 *  software distributed under the License is distributed on an

 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

 *  KIND, either express or implied.  See the License for the

 *  specific language governing permissions and limitations

 *  under the License.

 */

package dom.todo;


import java.math.BigDecimal;

import java.util.List;


import javax.jdo.annotations.Extension;

import javax.jdo.annotations.IdentityType;

import javax.jdo.annotations.InheritanceStrategy;


import org.joda.time.LocalDate;


import org.apache.isis.applib.AbstractViewModel;

import org.apache.isis.applib.annotation.Bookmarkable;

import org.apache.isis.applib.annotation.DescribedAs;

import org.apache.isis.applib.annotation.Hidden;

import org.apache.isis.applib.annotation.Immutable;

import org.apache.isis.applib.annotation.Optional;

import org.apache.isis.applib.annotation.Render;

import org.apache.isis.applib.annotation.Render.Type;

import org.apache.isis.applib.annotation.Title;




/**

 * View model that provides a summary of the sales made on a given day by
each party

 */

@javax.jdo.annotations.PersistenceCapable(

    identityType = IdentityType.NONDURABLE,

    table = "DailySalesTotalForParty",

    extensions = {

        @Extension(vendorName = "datanucleus", key = "view-definition",

            value = "CREATE VIEW \"DailySalesTotalForParty\" " +

                    "( " +

                    "  {this.transactionDate}, " +

                    "  {this.fromPartyId}, " +

                    "  {this.transactiontype}, " +

                    "  {this.totalAmount} " +

                    ") AS " +

                    "SELECT " +

                    "   \"Tranaction\".\"transactiondate\" , " +

                    "   \"Transaction.\".\"fromparty_party_id_oid\", " +

                    "   \"Transaction.\".\"transactiontype\", " +


                    "   SUM(\"Transaction\".\"facevalue\") AS
\"totalAmount\", " +

                    "  FROM \"Transaction\" " +

                    "GROUP BY " +

                    " \"Transaction\".\"fromparty_party_id_oid\", " +

                    " \"Transaction\".\"transactiondate\"")

    })

@javax.jdo.annotations.Inheritance(strategy = InheritanceStrategy.NEW_TABLE)

@Bookmarkable

@Immutable

public class DailySalesTotalForParty extends AbstractViewModel {


    private static final String OID_SEPARATOR = "_AND_";


    // //////////////////////////////////////


    /**

     * {@link org.apache.isis.applib.ViewModel} implementation.

     */

    @Override

    public String viewModelMemento() {

        return getFromPartyId() + OID_SEPARATOR +
getTransactionDate().toString();

    }


    /**

     * {@link org.apache.isis.applib.ViewModel} implementation.

     */

    @Override

    public void viewModelInit(final String memento) {

        String[] split = memento.split(OID_SEPARATOR);

        setFromPartyId(split[0]);

        setTransactionDate(new LocalDate(split[1]));

    }


    // //////////////////////////////////////


    private String fromPartyId;


    /**

     * Used as the {@link #viewModelMemento() view model memento}, holds the

     * reference of the corresponding {@link #getProperty()}.

     *

     * <p>

     * This attribute is always guaranteed to be populated.

     */

    @javax.jdo.annotations.Column(allowsNull = "false")

    @DescribedAs("From Party Id")

    @Hidden

    public String getFromPartyId() {

        return fromPartyId;

    }


    public void setFromPartyId(final String reference) {

        this.fromPartyId = reference;

    }


    // //////////////////////////////////////


    /**

     * Annotated as {@link javax.jdo.annotations.NotPersistent not
persistent}

     * because not mapped in the <tt>view-definition</tt>.

     */

    @javax.jdo.annotations.NotPersistent

    private Party fromParty;


    /**

     * Lazily loaded from the {@link #getReference() reference}, provides
access

     * to the underlying {@link Property}.

     */

    @Optional

    @Title(sequence = "1")

    public Party getFromParty() {

        if (fromParty == null) {

            setFromParty(partytypes.findPartyFromOID(getFromPartyId()));

        }

        return fromParty;

    }


    public void setFromParty(final Party party) {

        this.fromParty = party;

    }


    // //////////////////////////////////////


    private LocalDate transactionDate;


    @Title(sequence = "2", prepend = " - ")

    public LocalDate getTransactionDate() {

        return transactionDate;

    }


    public void setTransactionDate(final LocalDate dueDate) {

        this.transactionDate = dueDate;

    }


    // //////////////////////////////////////


    private BigDecimal totalAmount;


    public BigDecimal getTotalAmount() {

        return totalAmount;

    }


    public void setTotalAmount(final BigDecimal total) {

        this.totalAmount = total;

    }




    // //////////////////////////////////////


    @Render(Type.EAGERLY)

    public List<Transaction> getTransactions() {

        return transactions.findTransactionsForPartyAndDate(getParty(),
getTransactionDate());

    }


    // //////////////////////////////////////


    private Partytypes partytypes;


    final public void injectPartytypes(final Partytypes partytypes) {

        this.partytypes = partytypes;

    }


    private Transactions transactions;


    final public void injectTransactions(final Transactions transactions) {

        this.transactions = transactions;

    }


}