com.alibaba.innodb.java.reader.service.impl

类 DecoratedRecordIterator

java.lang.Object

com.alibaba.innodb.java.reader.service.impl.DecoratedRecordIterator

所有已实现的接口:

Iterator<GenericRecord>

public class DecoratedRecordIterator
extends Object
implements Iterator<GenericRecord>

Decorator pattern of record iterator.

Sub class can override next() to update the returned record. For example, in secondary key querying situation, we should look up record based on the secondary key which contains primary key.

   return new DecoratedRecordIterator(skRecordIterator) {

       public GenericRecord next() {
         GenericRecord skRecord = super.next();
         List<Object> primaryKey = new ArrayList<>(tableDef.getPrimaryKeyColumnNum());
         for (String pkName : tableDef.getPrimaryKeyColumnNames()) {
           primaryKey.add(skRecord.get(pkName));
         }
         return queryByPrimaryKey(primaryKey);
       }
     };
 

作者:

xu.zx

字段概要

字段

限定符和类型	字段和说明
protected Iterator<GenericRecord>	recordIterator

构造器概要

构造器

构造器和说明
DecoratedRecordIterator(Iterator<GenericRecord> recordIterator)

方法概要

限定符和类型	方法和说明
boolean	hasNext()
GenericRecord	next()

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 java.util.Iterator

forEachRemaining, remove

字段详细资料

recordIterator

protected Iterator<GenericRecord> recordIterator

构造器详细资料

DecoratedRecordIterator

public DecoratedRecordIterator(Iterator<GenericRecord> recordIterator)

方法详细资料

hasNext

public boolean hasNext()

指定者:

hasNext 在接口中 Iterator<GenericRecord>

next

public GenericRecord next()

指定者:

next 在接口中 Iterator<GenericRecord>