Permalink
Show file tree
Hide file tree
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Browse files
Fix remaining count error when query edge in page (#515)
Change-Id: I07920cb7de15a837cfad1f0a130fc6d036e4d3bd
- Loading branch information
Showing
20 changed files
with
232 additions
and
207 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| * Copyright 2017 HugeGraph Authors | ||
| * | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with this | ||
| * work for additional information regarding copyright ownership. The ASF | ||
| * licenses this file to You under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
||
| package com.baidu.hugegraph.backend.page; | ||
|
|
||
| import java.util.Base64; | ||
| import java.util.Iterator; | ||
|
|
||
| import com.baidu.hugegraph.HugeException; | ||
| import com.baidu.hugegraph.backend.serializer.BytesBuffer; | ||
| import com.baidu.hugegraph.iterator.Metadatable; | ||
| import com.baidu.hugegraph.util.Bytes; | ||
| import com.baidu.hugegraph.util.E; | ||
|
|
||
| public final class PageInfo { | ||
|
|
||
| public static final String PAGE = "page"; | ||
| public static final String PAGE_NONE = ""; | ||
|
|
||
| private int offset; | ||
| private String page; | ||
|
|
||
| public PageInfo(int offset, String page) { | ||
| E.checkArgument(offset >= 0, "The offset must be >= 0"); | ||
| E.checkNotNull(page, "page"); | ||
| this.offset = offset; | ||
| this.page = page; | ||
| } | ||
|
|
||
| public void increase() { | ||
| this.offset++; | ||
| this.page = PAGE_NONE; | ||
| } | ||
|
|
||
| public int offset() { | ||
| return this.offset; | ||
| } | ||
|
|
||
| public void page(String page) { | ||
| this.page = page; | ||
| } | ||
|
|
||
| public String page() { | ||
| return this.page; | ||
| } | ||
|
|
||
| @Override | ||
| public String toString() { | ||
| return Base64.getEncoder().encodeToString(this.toBytes()); | ||
| } | ||
|
|
||
| public byte[] toBytes() { | ||
| byte[] pageState = PageState.toBytes(this.page); | ||
| int length = 2 + BytesBuffer.INT_LEN + pageState.length; | ||
| BytesBuffer buffer = BytesBuffer.allocate(length); | ||
| buffer.writeInt(this.offset); | ||
| buffer.writeBytes(pageState); | ||
| return buffer.bytes(); | ||
| } | ||
|
|
||
| public static PageInfo fromString(String page) { | ||
| byte[] bytes; | ||
| try { | ||
| bytes = Base64.getDecoder().decode(page); | ||
| } catch (Exception e) { | ||
| throw new HugeException("Invalid page: '%s'", e, page); | ||
| } | ||
| return fromBytes(bytes); | ||
| } | ||
|
|
||
| public static PageInfo fromBytes(byte[] bytes) { | ||
| if (bytes.length == 0) { | ||
| // The first page | ||
| return new PageInfo(0, PAGE_NONE); | ||
| } | ||
| try { | ||
| BytesBuffer buffer = BytesBuffer.wrap(bytes); | ||
| int offset = buffer.readInt(); | ||
| byte[] pageState = buffer.readBytes(); | ||
| String page = PageState.toString(pageState); | ||
| return new PageInfo(offset, page); | ||
| } catch (Exception e) { | ||
| throw new HugeException("Invalid page: '0x%s'", | ||
| e, Bytes.toHex(bytes)); | ||
| } | ||
| } | ||
|
|
||
| public static String page(Iterator<?> iterator) { | ||
| E.checkState(iterator instanceof Metadatable, | ||
| "Invalid paging iterator: %s", iterator.getClass()); | ||
| Object page = ((Metadatable) iterator).metadata(PAGE); | ||
| return (String) page; | ||
| } | ||
| } |
Oops, something went wrong.