xuxiuxi

2017-08-01 e09e9f8a34cbc99a33dfa9ef1792b0025575c3a8

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//020 8330 0577 bob 
package com.awsle.aibatis.xml.engine.objecttree.reflection; 
 
import com.awsle.aibatis.xml.engine.objecttree.ObjectAccessException; 
import com.awsle.aibatis.xml.engine.objecttree.ObjectTree; 
 
import java.lang.reflect.Field; 
import java.lang.reflect.Modifier; 
import java.util.LinkedList; 
import java.util.List; 
 
public class ReflectionObjectGraph implements ObjectTree { 
 
    private LinkedList fieldStack = new LinkedList(); 
    private LinkedList instanceStack = new LinkedList(); 
    private Class rootType; 
    private ObjectFactory objectFactory; 
 
    public ReflectionObjectGraph(Object root, ObjectFactory objectFactory) { 
        this.objectFactory = objectFactory; 
        init(root); 
    } 
 
    public ReflectionObjectGraph(Class rootType, ObjectFactory objectFactory) { 
        this.rootType = rootType; 
        this.objectFactory = objectFactory; 
        init(null); 
    } 
 
    private static class RootHolder { 
        Object value; 
    } 
 
    private void init(Object root) { 
        RootHolder holder = new RootHolder(); 
        holder.value = root; 
        instanceStack.addLast(holder); 
        push("value"); 
    } 
 
    public void push(String fieldName) { 
        Object top = instanceStack.getLast(); 
 
        Field field = null; 
        Class currentClass = top.getClass(); 
        try { 
 
            while (field == null) { 
                try { 
                    field = currentClass.getDeclaredField(fieldName); 
                } catch (NoSuchFieldException e) { 
                    if (Object.class.equals(currentClass)) { 
                        throw new ObjectAccessException("Cannot access field " + fieldName, e); 
                    } 
                    currentClass = currentClass.getSuperclass(); 
                } 
            } 
 
        } catch (SecurityException e) { 
            throw new ObjectAccessException("Cannot access field " + fieldName, e); 
        } 
        field.setAccessible(true); 
        fieldStack.addLast(field); 
 
        try { 
            instanceStack.addLast(field.get(top)); 
        } catch (IllegalArgumentException e) { 
            throw new ObjectAccessException("Cannot access field " + fieldName, e); 
        } catch (IllegalAccessException e) { 
            throw new ObjectAccessException("Cannot access field " + fieldName, e); 
        } 
 
    } 
 
    public void pop() { 
        fieldStack.removeLast(); 
        instanceStack.removeLast(); 
    } 
 
    public Class type() { 
        if (fieldStack.size() == 1) { 
            return rootType; 
        } else { 
            Field field = (Field) fieldStack.getLast(); 
            Class type = field.getType(); 
            return type; 
        } 
    } 
 
    public Object get() { 
        return instanceStack.getLast(); 
    } 
 
    public void set(Object value) { 
        try { 
            instanceStack.removeLast(); 
            Field field = (Field) fieldStack.getLast(); 
            Object top = instanceStack.getLast(); 
            field.set(top, value); 
            instanceStack.addLast(value); 
        } catch (IllegalAccessException e) { 
            throw new ObjectAccessException("Cannot set field", e); 
        } 
    } 
 
    public void create(Class type) { 
        set(objectFactory.create(type)); 
    } 
 
    public String[] fieldNames() { 
        List fieldNames = new LinkedList(); 
        Class theClass = get().getClass(); 
        Class currentClass = theClass; 
 
        while (!Object.class.equals(currentClass)) { 
            getFields(fieldNames, currentClass); 
            currentClass = currentClass.getSuperclass(); 
        } 
 
        String[] result = new String[fieldNames.size()]; 
        fieldNames.toArray(result); 
        return result; 
    } 
 
    private void getFields(List fieldNames, Class theClass) { 
        Field[] fields = theClass.getDeclaredFields(); 
        for (int i = 0; i < fields.length; i++) { 
            Field field = fields[i]; 
            int modifiers = field.getModifiers(); 
            if (field.getName().startsWith("this$")) { 
                continue; 
            } 
            if (Modifier.isFinal(modifiers) || 
                    Modifier.isStatic(modifiers) || 
                    Modifier.isTransient(modifiers)) { 
                continue; 
            } 
            fieldNames.add(field.getName()); 
        } 
    } 
 
    public ObjectTree newStack(Class type) { 
        return new ReflectionObjectGraph(type, objectFactory); 
    } 
 
    public ObjectTree newStack(Object instance) { 
        return new ReflectionObjectGraph(instance, objectFactory); 
    } 
 
}