@Bizlet("数据对象扩展运算逻辑")
public class DataObjectExt {

private DataObjectExt(){
//工具类不能实例化
}

/**
* 将变长的源数组内容添加到目标Xpath数组
* @param targetXpath 目标数组的xpath
* @param sourceXpath 变长的源数组Xpath
*/
@Bizlet(
value="将变长的源数组内容添加到目标Xpath数组",
params = {
@BizletParam(index = 0, type = ParamType.CONSTANT,paramAlias="targetXpath"),
@BizletParam(index=1,type=ParamType.CONSTANT,paramAlias="strings")
}
)
public static void appendObject(String targetXpath,String...sourceXpath){
for(String xpath:sourceXpath){
appendObject(targetXpath,xpath);
}
}

/**
* 将源数组添加到目标Xpath数组
* @param targetXpath 目标数组的xpath名称
* @param dataObjects 源对象数组
*/
private static void appendObject(String targetXpath,String sourceXpath){

IDataContext context=DataContextManager.current().getDefaultContext();
Object[] sourceObjects=convertObjectArray(context.get(sourceXpath));
if(sourceObjects==null||sourceObjects.length==0)
return ;

Object[] targetObjects=convertObjectArray(context.get(targetXpath));
if(targetObjects==null||targetObjects.length==0){
targetObjects=new DataObject[sourceObjects.length];
System.arraycopy(sourceObjects, 0, targetObjects, 0, sourceObjects.length);
}else{
//临时交换变量
Object[] temp=new Object[targetObjects.length];
System.arraycopy(targetObjects, 0, temp, 0, targetObjects.length);

targetObjects=new Object[targetObjects.length+sourceObjects.length];
System.arraycopy(temp, 0, targetObjects, 0, temp.length);
System.arraycopy(sourceObjects, 0, targetObjects, temp.length, sourceObjects.length);
}
context.set(targetXpath, targetObjects);
}

private static Object[] convertObjectArray(Object object){
Object[] target=null;
if(object instanceof Collection){
Collection<?> collection=(Collection)object;
target=(Object[])collection.toArray(new Object[collection.size()]);
}else if(object instanceof Object[]){
target=(Object[])object;
}
return target;
}

/**
* 获取指定不重复属性值的数组
* @param xpath 目标数组的xpath
* @param propertyName 指定不重复的属性值
* @return 返回不重复属性值的对象数组
*/
@Bizlet(
value="获取指定不重复属性值的数组",
params = {
@BizletParam(index = 0, type = ParamType.CONSTANT,paramAlias="xpath"),
@BizletParam(index = 1, type = ParamType.CONSTANT,paramAlias="propertyName")
}
)
@SuppressWarnings("unchecked")
public static void getUniqueObjects(String xpath,final String propertyName){
IDataContext context=DataContextManager.current().getDefaultContext();

Object[] target=convertObjectArray(context.get(xpath));

if( target!=null && target.length>0) {

List targetList=Arrays.asList(target);
java.util.Collections.sort(targetList, new Comparator() {
public int compare(final Object o1, final Object o2){
final DataObject m1 = (DataObject)o1;
final DataObject m2 = (DataObject)o2;
if(m1.get(propertyName)!=null&&m2.get(propertyName)!=null){
final String order1=m1.get(propertyName).toString();
final String order2=m2.get(propertyName).toString();
return order1.compareTo(order2);
}
return 0;

}
});

Object value=null;
List<DataObject> result=new ArrayList<DataObject>();
for(Iterator it = targetList.iterator(); it.hasNext();) {
DataObject obj=(DataObject)it.next();
if(obj.get(propertyName)!=null&&obj.get(propertyName).equals(value)){
//it.remove()不能使用，从Arrays.asList的数组是不可修改的!!!
}else{
result.add(obj);
value=obj.get(propertyName);
}
}

context.set(xpath, (Object[])result.toArray(new Object[result.size()]));
}

}

/**
* 向当前DataContext中的数组对象或者list对象添加DataObject对象<BR>
* 如果对应的PropertyName已经存在，则不添加;如果propertyName为null则不检查对象的属性是否重复
* @param xpath DataObject数组或者list所在xpath。
* @param dataObject 需要添加的DataObject对象。
* @param propertyName 检查DataObject对象实体名的属性值是否已经存在数组中。
*/
@SuppressWarnings("unchecked")
@Bizlet(
value="添加不重复的数据对象到目标Xpath数组",
params = {
@BizletParam(index = 0, type = ParamType.CONSTANT,paramAlias="xpath"),
@BizletParam(index=1,type=ParamType.VARIABLE,paramAlias="dataObject"),
@BizletParam(index = 2, type = ParamType.CONSTANT,paramAlias="propertyName")
}
)
public static void appendObject(String xpath, DataObject dataObject,String propertyName) {

if (null == dataObject)
return ;

IDataContext ctx=DataContextManager.current().getDefaultContext();

DataObject[] target=null;

DataObject[] dataObjects=(DataObject[])ctx.get(xpath);

if(propertyName!=null&&isDuplicateProperty(dataObjects,dataObject,propertyName)){
return ;
}

int length = (dataObjects == null) ? 0 : Array.getLength(dataObjects);

target = new DataObject[length + 1];
for (int i = 0; i <length; i++)
target[i] = (DataObject) Array.get(dataObjects, i);

target[length] = dataObject;
ctx.set(xpath, target);
}

/**
* 判断目标数组中的对象是否存在与源对象中相同的属性值
* @param targets 目标数组
* @param source 源对象
* @param propertyName 属性名
* @return 存在返回true,不存在返回false
*/
private static boolean isDuplicateProperty(DataObject[] targets,DataObject source,String propertyName){
if(source==null||source.get(propertyName)==null)
return false;

if(targets!=null&&targets.length>0){
for(int i=0;i<targets.length;i++){
if(source.get(propertyName).equals(targets[i].get(propertyName))){
return true;
}
}
}
return false;
}

/**
* 不设置数据对象指定的属性值
* @param dataobject DataObject数据对象
* @param properties 属性名称动态数组
*/
@Bizlet(
value="不设置数据对象指定的属性",
params = {
@BizletParam(index = 0, type = ParamType.VARIABLE,paramAlias="dataObject"),
@BizletParam(index=1,type=ParamType.VARIABLE,paramAlias="properties")
}
)
public static void unSetProperties(DataObject dataobject, String... properties){
for(String propertyName:properties){
dataobject.unset(propertyName);
}
}

/**
* 不设置数据对象指定的属性,如果当前xpath的对象为集合或对象数组,则有相同属性的全部不设置属性值
* @param xpath 数据对象的xpath
* @param properties 属性名称动态数组
*/
@Bizlet(
value="不设置数据对象指定的属性",
params = {
@BizletParam(index = 0, type = ParamType.CONSTANT,paramAlias="xpath"),
@BizletParam(index=1,type=ParamType.VARIABLE,paramAlias="properties")
}
)
public static void unSetProperties(String xpath,String... properties){
IDataContext context=DataContextManager.current().getDefaultContext();
Object obj=context.get(xpath);
if(obj instanceof java.util.Collection){
java.util.Collection<?> collection=(java.util.Collection)obj;
context.set(xpath, unSetProperties((DataObject[])collection.toArray(new DataObject[collection.size()]),properties));
}
else if(obj instanceof DataObject[]){
DataObject[] dataObjects=(DataObject[])obj;
context.set(xpath, unSetProperties(dataObjects,properties));
}else if(obj instanceof DataObject){
DataObject dataObject=(DataObject)obj;
for(String propertyName:properties)
dataObject.unset(propertyName);
context.set(xpath, obj);
}

}

/**
* 清除数据对象的所有属性值
* @param dataObject DataObject对象
*/
@Bizlet(
value="清除数据对象的所有属性值",
params = {
@BizletParam(index = 0, type = ParamType.VARIABLE,paramAlias="dataObject"),
}
)
public static void cleanProperties(DataObject dataObject){
Iterator properties=dataObject.getType().getProperties().iterator();
while(properties.hasNext()){
Property property=(Property)properties.next();
dataObject.unset(property);
}

}


private static DataObject[] unSetProperties(DataObject[] obj,String... properties){
DataObject[] dataObjects=(DataObject[])obj;
List<DataObject> result=new ArrayList<DataObject>();
for(DataObject array:dataObjects){
for(String propertyName:properties){
array.unset(propertyName);
}
result.add(array);
}
return (DataObject[])result.toArray(new DataObject[result.size()]);
}
}

Oracle 修改表列属性,布布扣,bubuko.com

Oracle 修改表列属性