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131 changes: 131 additions & 0 deletions
131
common/variant/src/main/java/org/apache/spark/types/variant/Variant.java
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/* | ||
* 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 org.apache.spark.types.variant; | ||
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import com.fasterxml.jackson.core.JsonFactory; | ||
import com.fasterxml.jackson.core.JsonGenerator; | ||
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import java.io.CharArrayWriter; | ||
import java.io.IOException; | ||
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import static org.apache.spark.types.variant.VariantUtil.*; | ||
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/** | ||
* This class is structurally equivalent to {@link org.apache.spark.unsafe.types.VariantVal}. We | ||
* define a new class to avoid depending on or modifying Spark. | ||
*/ | ||
public final class Variant { | ||
private final byte[] value; | ||
private final byte[] metadata; | ||
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public Variant(byte[] value, byte[] metadata) { | ||
this.value = value; | ||
this.metadata = metadata; | ||
// There is currently only one allowed version. | ||
if (metadata.length < 1 || (metadata[0] & VERSION_MASK) != VERSION) { | ||
throw malformedVariant(); | ||
} | ||
// Don't attempt to use a Variant larger than 16 MiB. We'll never produce one, and it risks | ||
// memory instability. | ||
if (metadata.length > SIZE_LIMIT || value.length > SIZE_LIMIT) { | ||
throw variantConstructorSizeLimit(); | ||
} | ||
} | ||
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public byte[] getValue() { | ||
return value; | ||
} | ||
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public byte[] getMetadata() { | ||
return metadata; | ||
} | ||
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// Stringify the variant in JSON format. | ||
// Throw `MALFORMED_VARIANT` if the variant is malformed. | ||
public String toJson() { | ||
StringBuilder sb = new StringBuilder(); | ||
toJsonImpl(value, metadata, 0, sb); | ||
return sb.toString(); | ||
} | ||
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// Escape a string so that it can be pasted into JSON structure. | ||
// For example, if `str` only contains a new-line character, then the result content is "\n" | ||
// (4 characters). | ||
static String escapeJson(String str) { | ||
try (CharArrayWriter writer = new CharArrayWriter(); | ||
JsonGenerator gen = new JsonFactory().createGenerator(writer)) { | ||
gen.writeString(str); | ||
gen.flush(); | ||
return writer.toString(); | ||
} catch (IOException e) { | ||
throw new RuntimeException(e); | ||
} | ||
} | ||
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static void toJsonImpl(byte[] value, byte[] metadata, int pos, StringBuilder sb) { | ||
switch (VariantUtil.getType(value, pos)) { | ||
case OBJECT: | ||
handleObject(value, pos, (size, idSize, offsetSize, idStart, offsetStart, dataStart) -> { | ||
sb.append('{'); | ||
for (int i = 0; i < size; ++i) { | ||
int id = readUnsigned(value, idStart + idSize * i, idSize); | ||
int offset = readUnsigned(value, offsetStart + offsetSize * i, offsetSize); | ||
int elementPos = dataStart + offset; | ||
if (i != 0) sb.append(','); | ||
sb.append(escapeJson(getMetadataKey(metadata, id))); | ||
sb.append(':'); | ||
toJsonImpl(value, metadata, elementPos, sb); | ||
} | ||
sb.append('}'); | ||
return null; | ||
}); | ||
break; | ||
case ARRAY: | ||
handleArray(value, pos, (size, offsetSize, offsetStart, dataStart) -> { | ||
sb.append('['); | ||
for (int i = 0; i < size; ++i) { | ||
int offset = readUnsigned(value, offsetStart + offsetSize * i, offsetSize); | ||
int elementPos = dataStart + offset; | ||
if (i != 0) sb.append(','); | ||
toJsonImpl(value, metadata, elementPos, sb); | ||
} | ||
sb.append(']'); | ||
return null; | ||
}); | ||
break; | ||
case NULL: | ||
sb.append("null"); | ||
break; | ||
case BOOLEAN: | ||
sb.append(VariantUtil.getBoolean(value, pos)); | ||
break; | ||
case LONG: | ||
sb.append(VariantUtil.getLong(value, pos)); | ||
break; | ||
case STRING: | ||
sb.append(escapeJson(VariantUtil.getString(value, pos))); | ||
break; | ||
case DOUBLE: | ||
sb.append(VariantUtil.getDouble(value, pos)); | ||
break; | ||
case DECIMAL: | ||
sb.append(VariantUtil.getDecimal(value, pos).toPlainString()); | ||
break; | ||
} | ||
} | ||
} |
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