JavaFX的MapValueFactory类学习

﹏ヽ暗。殇╰゛Y 2023-10-14 15:02 19阅读 0赞

MapValueFactory类类似PropertyValueFactory类，作用于TableColumn类，绑定数据。以下是MayValueFactory的是实现代码。

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by FernFlower decompiler)
    //
    
    package javafx.scene.control.cell;
    
    import java.util.Map;
    import javafx.beans.NamedArg;
    import javafx.beans.property.ReadOnlyBooleanWrapper;
    import javafx.beans.property.ReadOnlyDoubleWrapper;
    import javafx.beans.property.ReadOnlyFloatWrapper;
    import javafx.beans.property.ReadOnlyIntegerWrapper;
    import javafx.beans.property.ReadOnlyLongWrapper;
    import javafx.beans.property.ReadOnlyObjectWrapper;
    import javafx.beans.property.ReadOnlyStringWrapper;
    import javafx.beans.value.ObservableValue;
    import javafx.scene.control.TableColumn;
    import javafx.util.Callback;
    
    public class MapValueFactory<T> implements Callback<TableColumn.CellDataFeatures<Map, T>, ObservableValue<T>> {
        private final Object key;
    
        public MapValueFactory(@NamedArg("key") Object var1) {
            this.key = var1;
        }
    
        public ObservableValue<T> call(TableColumn.CellDataFeatures<Map, T> var1) {
            Map var2 = (Map)var1.getValue();
            Object var3 = var2.get(this.key);
            if (var3 instanceof ObservableValue) {
                return (ObservableValue)var3;
            } else if (var3 instanceof Boolean) {
                return new ReadOnlyBooleanWrapper((Boolean)var3);
            } else if (var3 instanceof Integer) {
                return new ReadOnlyIntegerWrapper((Integer)var3);
            } else if (var3 instanceof Float) {
                return new ReadOnlyFloatWrapper((Float)var3);
            } else if (var3 instanceof Long) {
                return new ReadOnlyLongWrapper((Long)var3);
            } else if (var3 instanceof Double) {
                return new ReadOnlyDoubleWrapper((Double)var3);
            } else {
                return (ObservableValue)(var3 instanceof String ? new ReadOnlyStringWrapper((String)var3) : new ReadOnlyObjectWrapper(var3));
            }
        }
    }

《Learn JavaFX 8 Building User Experience and Interface with Java 8》中chapter13章示例，在此，自定义继承Callback<CellDataFeatures<Map, T>, ObservableValue<T>>接口的PersonDataInMapFactory类。实现如下：

package learn.javafx8.ch13.maptableview01;
    
    import java.time.LocalDate;
    import java.util.Map;
    
    import javafx.beans.property.ReadOnlyIntegerWrapper;
    import javafx.beans.property.ReadOnlyObjectWrapper;
    import javafx.beans.property.ReadOnlyStringWrapper;
    import javafx.beans.value.ObservableValue;
    import javafx.scene.control.TableColumn.CellDataFeatures;
    import javafx.util.Callback;
    
    /**
     * @copyright 2023-2022
     * @package   learn.javafx8.ch13.maptableview01
     * @file      PersonDataInMapFactory.java
     * @date      2023-07-27 10:59
     * @author    qiao wei
     * @version   1.0
     * @brief     继承Callback<CellDataFeatures<Map, T>, ObservableValue<T>>接口。手动实现MapValueFactory功能。
     * @history
     */
    public class PersonDataInMapFactory<T>
        implements Callback<CellDataFeatures<Map, T>, ObservableValue<T>> {
        
        /**
         * @class   PersonDataInMapFactory
         * @date    2023-07-27 23:32
         * @author  qiao wei
         * @version 1.0
         * @brief   Constructor.
         * @param   key Map实例中的对应key值。
         * @return  
         * @throws
         */
        public PersonDataInMapFactory(Object key) {
            this.key = key;
        }
        
        @Override
        public ObservableValue<T> call(CellDataFeatures<Map, T> dataFeatures) {
            Object value = ((Map) dataFeatures.getValue()).get(this.key);
            
            if (value instanceof ObservableValue) {
                return (ObservableValue) value;
            } else if (value instanceof Integer) {
                return (ObservableValue<T>) new ReadOnlyIntegerWrapper((Integer)value);
            } else if (value instanceof String) {
                return (ObservableValue<T>) new ReadOnlyStringWrapper((String) value);
            } else if (value instanceof LocalDate) {
                LocalDate localDate = (LocalDate) value;
                return (ObservableValue<T>) new ReadOnlyObjectWrapper(localDate);
            }
    
            return null;
        }
    
        private final Object key;
    }