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132 changes: 132 additions & 0 deletions
132
flint-core/src/main/scala/org/opensearch/flint/core/metadata/FlintJsonHelper.scala
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/* | ||
* Copyright OpenSearch Contributors | ||
* SPDX-License-Identifier: Apache-2.0 | ||
*/ | ||
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package org.opensearch.flint.core.metadata | ||
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import java.nio.charset.StandardCharsets.UTF_8 | ||
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import org.opensearch.common.bytes.BytesReference | ||
import org.opensearch.common.xcontent._ | ||
import org.opensearch.common.xcontent.json.JsonXContent | ||
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/** | ||
* JSON parsing and building helper. | ||
*/ | ||
object FlintJsonHelper { | ||
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/** | ||
* Build JSON by creating JSON builder and pass it to the given function. | ||
* | ||
* @param block | ||
* building logic with JSON builder | ||
* @return | ||
* JSON string | ||
*/ | ||
def buildJson(block: XContentBuilder => Unit): String = { | ||
val builder: XContentBuilder = XContentFactory.jsonBuilder | ||
builder.startObject | ||
block(builder) | ||
builder.endObject() | ||
BytesReference.bytes(builder).utf8ToString | ||
} | ||
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/** | ||
* Add an object field of the name to the JSON builder and continue building it with the given | ||
* function. | ||
* | ||
* @param builder | ||
* JSON builder | ||
* @param name | ||
* field name | ||
* @param block | ||
* building logic on the JSON field | ||
*/ | ||
def objectField(builder: XContentBuilder, name: String)(block: => Unit): Unit = { | ||
builder.startObject(name) | ||
block | ||
builder.endObject() | ||
} | ||
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/** | ||
* Add an optional object field of the name to the JSON builder. Add an empty object field if | ||
* the value is null. | ||
* | ||
* @param builder | ||
* JSON builder | ||
* @param name | ||
* field name | ||
* @param value | ||
* field value | ||
*/ | ||
def optionalObjectField(builder: XContentBuilder, name: String, value: AnyRef): Unit = { | ||
if (value == null) { | ||
builder.startObject(name).endObject() | ||
} else { | ||
builder.field(name, value) | ||
} | ||
} | ||
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/** | ||
* Create a XContent JSON parser on the given JSON string. | ||
* | ||
* @param json | ||
* JSON string | ||
* @return | ||
* JSON parser | ||
*/ | ||
def createJsonParser(json: String): XContentParser = { | ||
JsonXContent.jsonXContent.createParser( | ||
NamedXContentRegistry.EMPTY, | ||
DeprecationHandler.IGNORE_DEPRECATIONS, | ||
json.getBytes(UTF_8)) | ||
} | ||
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/** | ||
* Parse the given JSON string by creating JSON parser and pass it to the parsing function. | ||
* | ||
* @param json | ||
* JSON string | ||
* @param block | ||
* parsing logic with the parser | ||
*/ | ||
def parseJson(json: String)(block: (XContentParser, String) => Unit): Unit = { | ||
val parser = createJsonParser(json) | ||
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// Read first root object token and start parsing | ||
parser.nextToken() | ||
parseObjectField(parser)(block) | ||
} | ||
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/** | ||
* Parse each inner field in the object field with the given parsing function. | ||
* | ||
* @param parser | ||
* JSON parser | ||
* @param block | ||
* parsing logic on each inner field | ||
*/ | ||
def parseObjectField(parser: XContentParser)(block: (XContentParser, String) => Unit): Unit = { | ||
while (parser.nextToken() != XContentParser.Token.END_OBJECT) { | ||
val fieldName: String = parser.currentName() | ||
parser.nextToken() // Move to the field value | ||
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block(parser, fieldName) | ||
} | ||
} | ||
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/** | ||
* Parse each inner field in the array field. | ||
* | ||
* @param parser | ||
* JSON parser | ||
* @param block | ||
* parsing logic on each inner field | ||
*/ | ||
def parseArrayField(parser: XContentParser)(block: => Unit): Unit = { | ||
while (parser.nextToken() != XContentParser.Token.END_ARRAY) { | ||
block | ||
} | ||
} | ||
} |
40 changes: 0 additions & 40 deletions
40
flint-core/src/main/scala/org/opensearch/flint/core/metadata/FlintMetadata.java
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