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Support pagination when single index query
Change-Id: I15c10c702078ff4a998378633e5cbb68cf2ac5fa
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83 changes: 83 additions & 0 deletions
83
hugegraph-core/src/main/java/com/baidu/hugegraph/backend/serializer/PageState.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package com.baidu.hugegraph.backend.serializer; | ||
|
|
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| import java.util.Base64; | ||
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| import com.baidu.hugegraph.backend.BackendException; | ||
| import com.baidu.hugegraph.util.Bytes; | ||
| import com.baidu.hugegraph.util.E; | ||
|
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| public class PageState { | ||
|
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| private final byte[] position; | ||
| private final int offset; | ||
|
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| public PageState(byte[] position, int offset) { | ||
| E.checkNotNull(position, "position"); | ||
| this.position = position; | ||
| this.offset = offset; | ||
| } | ||
|
|
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| public byte[] position() { | ||
| return this.position; | ||
| } | ||
|
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| public int offset() { | ||
| return this.offset; | ||
| } | ||
|
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| @Override | ||
| public String toString() { | ||
| return Base64.getEncoder().encodeToString(this.toBytes()); | ||
| } | ||
|
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| public byte[] toBytes() { | ||
| int length = 2 + this.position.length + BytesBuffer.INT_LEN; | ||
| BytesBuffer buffer = BytesBuffer.allocate(length); | ||
| buffer.writeBytes(this.position); | ||
| buffer.writeInt(this.offset); | ||
| return buffer.bytes(); | ||
| } | ||
|
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| public static PageState fromString(String page) { | ||
| byte[] bytes; | ||
| try { | ||
| bytes = Base64.getDecoder().decode(page); | ||
| } catch (Exception e) { | ||
| throw new BackendException("Invalid page: '%s'", e, page); | ||
| } | ||
| return fromBytes(bytes); | ||
| } | ||
|
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| public static PageState fromBytes(byte[] bytes) { | ||
| if (bytes.length == 0) { | ||
| // The first page | ||
| return new PageState(new byte[0], 0); | ||
| } | ||
| try { | ||
| BytesBuffer buffer = BytesBuffer.wrap(bytes); | ||
| return new PageState(buffer.readBytes(), buffer.readInt()); | ||
| } catch (Exception e) { | ||
| throw new BackendException("Invalid page: '0x%s'", | ||
| e, Bytes.toHex(bytes)); | ||
| } | ||
| } | ||
| } |
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46 changes: 46 additions & 0 deletions
46
hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/EntireIds.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package com.baidu.hugegraph.backend.tx; | ||
|
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| import java.util.Collection; | ||
| import java.util.Set; | ||
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| import com.baidu.hugegraph.backend.id.Id; | ||
| import com.baidu.hugegraph.util.E; | ||
|
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| public class EntireIds implements Ids { | ||
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| private final Set<Id> ids; | ||
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| public EntireIds(Collection<Id> ids) { | ||
| E.checkArgument(ids instanceof Set, | ||
| "The ids of EntireIds must be Set, but got '%s'", | ||
| ids.getClass().getName()); | ||
| this.ids = (Set<Id>) ids; | ||
| } | ||
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| public EntireIds(Set<Id> ids) { | ||
| this.ids = ids; | ||
| } | ||
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| public Set<Id> ids() { | ||
| return this.ids; | ||
| } | ||
| } |
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