在 Simtay SimpleCRUD 上解析 File:LazyUserDataModel.java 时出错

Question

我最近下载了 Simtay 的这个 SimpleCRUD 应用程序。我在 Netbeans 8.0.1 上加载了项目并添加了必要的库。我收到此错误：

@Override public List load(int first, int pageSize, String sortField, SortOrder sortOrder, Map filters) on the class

LazyUserDataModel.java

下面是class.

package com.nz.simplecrud.controller;


import com.nz.simplecrud.entity.User;
import com.nz.simplecrud.service.DataAccessService;
import com.nz.simplecrud.util.LazySorter;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.primefaces.model.LazyDataModel;
import org.primefaces.model.SortOrder;

/**
 * 
 * Custom Lazy User DataModel which extends PrimeFaces LazyDataModel.
 * For more information please visit http://www.primefaces.org/showcase-labs/ui/datatableLazy.jsf
 */

public class LazyUserDataModel extends LazyDataModel<User> implements Serializable{

    // Data Source for binding data to the DataTable
    private List<User> datasource;
    // Selected Page size in the DataTable
    private int pageSize;
    // Current row index number
    private int rowIndex;
    // Total row number
    private int rowCount;
    // Data Access Service for create read update delete operations
    private DataAccessService crudService;

    /**
     *
     * @param crudService
     */
    public LazyUserDataModel(DataAccessService crudService) {
        this.crudService = crudService;
    }

    /**
     * Lazy loading user list with sorting ability
     * @param first
     * @param pageSize
     * @param sortField
     * @param sortOrder
     * @param filters
     * @return List<User>
     */ 
    @Override
    public List<User> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String,String> filters) {
        datasource = crudService.findWithNamedQuery(User.ALL, first, first + pageSize);
        // if sort field is not null then we sort the field according to sortfield and sortOrder parameter
        if(sortField != null) {  
            Collections.sort(datasource, new LazySorter(sortField, sortOrder));  
        } 
        setRowCount(crudService.countTotalRecord(User.TOTAL));   
        return datasource;
    }

    /**
     * Checks if the row is available
     * @return boolean
     */
    @Override
    public boolean isRowAvailable() {
        if(datasource == null) 
            return false;
        int index = rowIndex % pageSize ; 
        return index >= 0 && index < datasource.size();
    }

    /**
     * Gets the user object's primary key
     * @param user
     * @return Object
     */
    @Override
    public Object getRowKey(User user) {
        return user.getId().toString();
    }

    /**
     * Returns the user object at the specified position in datasource.
     * @return 
     */
    @Override
    public User getRowData() {
        if(datasource == null)
            return null;
        int index =  rowIndex % pageSize;
        if(index > datasource.size()){
            return null;
        }
        return datasource.get(index);
    }

    /**
     * Returns the user object that has the row key.
     * @param rowKey
     * @return 
     */
    @Override
    public User getRowData(String rowKey) {
        if(datasource == null)
            return null;
       for(User user : datasource) {  
           if(user.getId().toString().equals(rowKey))  
           return user;  
       }  
       return null;  
    }


    /*
     * ===== Getters and Setters of LazyUserDataModel fields
     */


    /**
     *
     * @param pageSize
     */
    @Override
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    /**
     * Returns page size
     * @return int
     */
    @Override
    public int getPageSize() {
        return pageSize;
    }

    /**
     * Returns current row index
     * @return int
     */
    @Override
    public int getRowIndex() {
        return this.rowIndex;
    }

    /**
     * Sets row index
     * @param rowIndex
     */
    @Override
    public void setRowIndex(int rowIndex) {
        this.rowIndex = rowIndex;
    }

    /**
     * Sets row count
     * @param rowCount
     */
    @Override
    public void setRowCount(int rowCount) {
        this.rowCount = rowCount;
    }

    /**
     * Returns row count
     * @return int
     */
    @Override
    public int getRowCount() {
        return this.rowCount;
    }

    /**
     * Sets wrapped data
     * @param list
     */
    @Override
    public void setWrappedData(Object list) {
        this.datasource = (List<User>) list;
    }

    /**
     * Returns wrapped data
     * @return
     */
    @Override
    public Object getWrappedData() {
        return datasource;
    }
}

有什么帮助吗？？

Answer 1

覆盖规则

The argument list should be exactly the same as that of the overridden method. The return type should be the same or a subtype of the return type declared in the original overridden method in the super class.

LazyDataModel class 有一个名为 load (Primefaces 5) 的方法

public List<T> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String, Object> filters) {
throw new UnsupportedOperationException("Lazy loading is not implemented.");
 }

如果您使用的是 Primefaces 5，则只能在 LazyUserDataModel 中重写上述方法。

自方法

load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String,String> filters)

没有出现在LazyDataModel(PF5)中，有错误是正常的。

那么如何解决呢？

将Map<String,String> filters更改为Map<String, Object> filters（为了覆盖需要具有相同的签名）

注：Simtay项目使用PF3.4编写，LazyDataModel.

在 Simtay SimpleCRUD 上解析 File:LazyUserDataModel.java 时出错

Error Parsing File:LazyUserDataModel.java on Simtay SimpleCRUD

java

primefaces

netbeans-8