本文整理了Java中org.nutz.lang.Lang.first()方法的一些代码示例，展示了Lang.first()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Lang.first()方法的具体详情如下：
包路径：org.nutz.lang.Lang
类名称：Lang
方法名：first

Lang.first介绍

[英]如果是数组或集合取得第一个对象。否则返回自身
[中]如果是数组或集合取得第一个对象。否则返回自身

代码示例

代码示例来源：origin: nutzam/nutz

/**
 * 将集合变成数组，数组的类型为集合的第一个元素的类型。如果集合为空，则返回 null
 *
 * @param coll
 *            集合对象
 * @return 数组
 */
@SuppressWarnings("unchecked")
public static <E> E[] collection2array(Collection<E> coll) {
  if (null == coll)
    return null;
  if (coll.size() == 0)
    return (E[]) new Object[0];
  Class<E> eleType = (Class<E>) Lang.first(coll).getClass();
  return collection2array(coll, eleType);
}

代码示例来源：origin: nutzam/nutz

public int update(final Object obj, String actived, String locked, boolean ignoreNull) {
  Object first = Lang.first(obj);
  if (null == first)
    return 0;
  return update(obj, FieldFilter.create(first.getClass(), actived, locked, ignoreNull));
}

代码示例来源：origin: nutzam/nutz

@SuppressWarnings("unchecked")
public Object get(ServletContext sc, HttpServletRequest req, HttpServletResponse resp, Object refer) {
  if (refer == null)
    return null;
  Object obj = ((Map<String, Object>) refer).get(name);
  if (obj == null || Lang.eleSize(obj) == 0)
    return EMTRY;
  if (Lang.eleSize(obj) == 1) {
    Object tmp = Lang.first(obj);
    if (tmp == null || !(tmp instanceof TempFile))
      return EMTRY;
    return new TempFile[]{(TempFile)tmp};
  }
  final List<TempFile> list = new ArrayList<TempFile>();
  Lang.each(obj, new Each<Object>() {
    public void invoke(int index, Object ele, int length) throws ExitLoop, ContinueLoop, LoopException {
      if (ele instanceof TempFile) {
        list.add((TempFile)ele);
      }
    }
  });
  if (list.isEmpty())
    return EMTRY;
  return list.toArray(new TempFile[list.size()]);
}

代码示例来源：origin: nutzam/nutz

public Pojo addUpdate(final Entity<?> en, final Object obj) {
  if (null == en)
    return null;
  Pojo pojo = dao.pojoMaker.makeUpdate(en, null)
                .append(Pojos.Items.cndAuto(en, Lang.first(obj)))
                .setOperatingObject(obj);
  pojoList.add(pojo);
  return pojo;
}

代码示例来源：origin: nutzam/nutz

public int update(final Object obj, String actived) {
  Object first = Lang.first(obj);
  if (null == first)
    return 0;
  if (Strings.isBlank(actived))
    return update(obj);
  
  return update(obj, FieldFilter.create(first.getClass(), actived));
}

代码示例来源：origin: nutzam/nutz

public <T> T insertOrUpdate(T t, final FieldFilter insertFieldFilter, final FieldFilter updateFieldFilter) {
  if (t == null)
    return null;
  Object obj = Lang.first(t);
  final Entity<?> en = getEntity(obj.getClass());
  Lang.each(t, new Each<Object>() {

代码示例来源：origin: nutzam/nutz

public <T> T insert(T obj, String actived) {
  Object first = Lang.first(obj);
  if (null == first)
    return null;
  if (Strings.isBlank(actived))
    return insert(obj);
  
  return insert(obj, FieldFilter.create(first.getClass(), actived));
}

代码示例来源：origin: nutzam/nutz

public int updateWithVersion(Object obj, FieldFilter fieldFilter) {
  return updateAndIncrIfMatch(obj, fieldFilter, getEntity(Lang.first(obj).getClass()).getVersionField().getName());
}

代码示例来源：origin: nutzam/nutz

/**
 * 根据一个对象获取实体
 * <p>
 * 对象如果是集合或者数组，则取其第一个元素进行判断
 * 
 * @param obj
 *            对象
 * @return 实体
 */
@SuppressWarnings("unchecked")
public Entity<?> getEntityBy(Object obj) {
  // 正常的构建一个 Entity
  Object first = Lang.first(obj);
  // 对象为空，不能构建实体
  if (first == null)
    return null;
  // 这是一个 Map,试图构建一个 entity
  if (first instanceof Map<?, ?>) {
    Object tableName = ((Map<String, ?>) first).get(".table");
    if (null == tableName)
      throw Lang.makeThrow("Can not insert map without key '.table' : \n%s",
                 Json.toJson(first, JsonFormat.forLook()));
    return makeEntity(tableName.toString(), (Map<String, ?>) first);
  }
  // 作为 POJO 构建
  return getEntity(first.getClass());
}

代码示例来源：origin: nutzam/nutz

Object first = Lang.first(obj);
if (first != null && first instanceof Map) {
  final Map<String, Object> tmp = new HashMap<String, Object>();

代码示例来源：origin: nutzam/nutz

Object first = Lang.first(value);
if (null == first)
  return null;

代码示例来源：origin: nutzam/nutz

public <T> T insert(final T t, boolean ignoreNull, boolean ignoreZero, boolean ignoreBlankStr) {
  Object obj = Lang.first(t);
  Entity<?> en = getEntity(obj.getClass());
  List<String> names = new ArrayList<String>();
  for (MappingField mf : en.getMappingFields()) {
    if (mf.isName() || mf.isPk() || mf.isId()) {
      names.add(mf.getName());
      continue;
    }
    Object tmp = mf.getValue(obj);
    if (ignoreNull && tmp == null) {
      continue;
    }
    if (ignoreZero && (tmp == null || (tmp instanceof Number && ((Number)tmp).intValue() == 0))) {
      continue;
    }
    if (ignoreBlankStr && (tmp instanceof CharSequence && Strings.isBlank((CharSequence)tmp)))
      continue;
    names.add(mf.getName());
  }
  FieldFilter ff = FieldFilter.create(obj.getClass(), "^("+Strings.join("|", names.toArray())+")$");
  Molecule<T> m = new Molecule<T>() {
    public void run() {
      insert(t);
      setObj(t);
    }
  };
  return ff.run(m);
}

代码示例来源：origin: nutzam/nutz

if (obj == null)
  return false;
obj = Lang.first(obj);
if (obj == null) {
  return false;

代码示例来源：origin: nutzam/nutz

public Pojo addUpdateAndIncrIfMatch(final Entity<?> en, final Object obj, String fieldName) {
  if (null == en)
    return null;
  MappingField mf = en.getField(fieldName);
  Pojo pojo = dao.pojoMaker.makeUpdate(en, null)
                .append(new Static("," + mf.getColumnNameInSql() + "=" + mf.getColumnNameInSql() + "+1"))
                .append(Pojos.Items.cndAuto(en, Lang.first(obj)))
                .setOperatingObject(obj);
  pojo.append(new Static("AND")).append(((AbstractPItem)Pojos.Items.cndColumn(mf, null)).setTop(false));
  pojoList.add(pojo);
  return pojo;
}

代码示例来源：origin: nutzam/nutz

public static List<MappingField> getFieldsForUpdate(Entity<?> en, FieldMatcher fm, Object refer) {
  List<MappingField> re = new ArrayList<MappingField>(en.getMappingFields().size());
  Object tmp = Lang.first(refer);
  for (MappingField mf : en.getMappingFields()) {
    if (mf.isPk()) {
      if (en.getPkType() == PkType.ID && mf.isId())
        continue;
      if (en.getPkType() == PkType.NAME && mf.isName())
        continue;
      if (en.getPkType() == PkType.COMPOSITE && mf.isCompositePk())
        continue;
    }
    if (mf.isReadonly() || mf.isAutoIncreasement() || !mf.isUpdate())
      continue;
    if (fm == null) {
      re.add(mf);
    }
    else if (tmp == null) {
      if (fm.match(mf.getName()))
        re.add(mf);
    }
    else {
      if (fm.match(mf, tmp))
        re.add(mf);
    }
  }
  if (re.isEmpty() && log.isDebugEnabled())
    log.debug("none field for update!");
  return re;
}

代码示例来源：origin: nutzam/nutz

public <T> T insert(final T obj) {
  Object first = Lang.first(obj);
  final EntityOperator opt = _optBy(first);
  if (null == opt)
    return null;
  int size = Lang.eleSize(obj);
  opt.addInsert(opt.entity, first);
  if (size > 1) {
    if (opt.getPojoListSize() == 1) {
      // 单一操作,可以转为批量插入
      return fastInsert(obj);
    }
    Lang.each(obj, false, new Each<Object>() {
      public void invoke(int i, Object ele, int length) throws ExitLoop, LoopException {
        if (i != 0)
          opt.addInsert(opt.entity, ele);
      }
    });
  }
  opt.exec();
  return obj;
}

代码示例来源：origin: nutzam/nutz

public Pojo addUpdateByPkAndCnd(final Entity<?> en, final Object obj, final Condition cnd) {
  if (null == en)
    return null;
  Pojo pojo = dao.pojoMaker.makeUpdate(en, null);
  
  boolean pureCnd = en.getPkType() == PkType.UNKNOWN;
  if (!pureCnd) {
    pojo.append(Pojos.Items.cndAuto(en, Lang.first(obj)));
    pojo.append(new Static(" AND "));
  }
  if (cnd instanceof Criteria) {
    // 只取它的where条件
    pojo.append(((Criteria)cnd).where().setTop(pureCnd));
  } else {
    pojo.append(new ConditionPItem(cnd).setTop(pureCnd));
  }
  pojo.setOperatingObject(obj);
  pojoList.add(pojo);
  return pojo;
}

代码示例来源：origin: nutzam/nutz

public static PItem cndAuto(Entity<?> en, Object obj) {
  obj = Lang.first(obj);
  switch (en.getPkType()) {
  case ID:

代码示例来源：origin: nutzam/nutz

Method m;
if (hasNullArg) {
  m = (Method) Lang.first(mi.findMethods(ss[1],args.length));
  if (m == null)
    throw new IocException(ing.getObjectName(), "Factory method not found --> ", iobj.getFactory());

代码示例来源：origin: org.nutz/nutz

public Pojo addUpdateAndIncrIfMatch(final Entity<?> en, final Object obj, String fieldName) {
  if (null == en)
    return null;
  MappingField mf = en.getField(fieldName);
  Pojo pojo = dao.pojoMaker.makeUpdate(en, null)
                .append(new Static("," + mf.getColumnNameInSql() + "=" + mf.getColumnNameInSql() + "+1"))
                .append(Pojos.Items.cndAuto(en, Lang.first(obj)))
                .setOperatingObject(obj);
  pojo.append(new Static("AND")).append(((AbstractPItem)Pojos.Items.cndColumn(mf, null)).setTop(false));
  pojoList.add(pojo);
  return pojo;
}

org.nutz.lang.Lang.first()方法的使用及代码示例

Lang.first介绍

代码示例

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Lang类方法