rdblue commented on code in PR #11857: URL: https://github.com/apache/iceberg/pull/11857#discussion_r1927944759
########## core/src/main/java/org/apache/iceberg/variants/VariantBuilder.java: ########## @@ -0,0 +1,178 @@ +/* + * 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 org.apache.iceberg.variants; + +import com.fasterxml.jackson.core.JsonFactory; +import com.fasterxml.jackson.core.JsonParseException; +import com.fasterxml.jackson.core.JsonParser; +import com.fasterxml.jackson.core.JsonToken; +import com.fasterxml.jackson.core.exc.InputCoercionException; +import java.io.IOException; +import java.math.BigDecimal; +import java.util.List; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; + +/** A builder class to build a primitive/array/object variant. */ +public class VariantBuilder extends VariantBuilderBase { + public VariantBuilder() { + super(new VariantBuilderBase.ByteBufferWrapper(), new VariantBuilderBase.Dictionary()); + } + + public VariantPrimitiveBuilder createPrimitive() { + VariantPrimitiveBuilder primitiveBuilder = new VariantPrimitiveBuilder(getBuffer(), getDict()); + return primitiveBuilder; + } + + public VariantObjectBuilder startObject() { + return new VariantObjectBuilder(getBuffer(), getDict()); + } + + public VariantArrayBuilder startArray() { + return new VariantArrayBuilder(getBuffer(), getDict()); + } + + /** + * Parses a JSON string and constructs a Variant object. + * + * @param json The JSON string to parse. + * @return The constructed Variant object. + * @throws IOException If an error occurs while reading or parsing the JSON. + */ + public static Variant parseJson(String json) throws IOException { + Preconditions.checkArgument( + json != null && !json.isEmpty(), "Input JSON string cannot be null or empty."); + + try (JsonParser parser = new JsonFactory().createParser(json)) { + parser.nextToken(); + + VariantBuilder builder = new VariantBuilder(); + builder.buildJson(parser); + + return builder.build(); + } + } + + private void buildJson(JsonParser parser) throws IOException { + JsonToken token = parser.currentToken(); + + if (token == null) { + throw new JsonParseException(parser, "Unexpected null token"); + } + + switch (token) { + case START_OBJECT: + writeObject(parser); + break; + case START_ARRAY: + writeArray(parser); + break; + case VALUE_STRING: + writeStringInternal(parser.getText()); + break; + case VALUE_NUMBER_INT: + writeInteger(parser); + break; + case VALUE_NUMBER_FLOAT: + writeFloat(parser); + break; + case VALUE_TRUE: + writeBooleanInternal(true); + break; + case VALUE_FALSE: + writeBooleanInternal(false); + break; + case VALUE_NULL: + writeNullInternal(); + break; + default: + throw new JsonParseException(parser, "Unexpected token " + token); + } + } + + private void writeObject(JsonParser parser) throws IOException { + List<VariantBuilderBase.FieldEntry> fields = Lists.newArrayList(); + int startPos = getBuffer().getPos(); + + // Store object keys to dictionary of metadata + while (parser.nextToken() != JsonToken.END_OBJECT) { + String key = parser.currentName(); + parser.nextToken(); // Move to the value + + int id = getDict().add(key); + fields.add(new VariantBuilderBase.FieldEntry(key, id, getBuffer().getPos() - startPos)); + buildJson(parser); + } + + endObject(startPos, fields); + } + + private void writeArray(JsonParser parser) throws IOException { + List<Integer> offsets = Lists.newArrayList(); + int startPos = getBuffer().getPos(); + + while (parser.nextToken() != JsonToken.END_ARRAY) { + offsets.add(getBuffer().getPos() - startPos); + buildJson(parser); + } + + endArray(startPos, offsets); + } + + private void writeInteger(JsonParser parser) throws IOException { + try { + writeNumericInternal(parser.getLongValue()); + } catch (InputCoercionException ignored) { + writeFloat(parser); // Fallback for large integers + } + } + + private void writeFloat(JsonParser parser) throws IOException { + if (!tryWriteDecimal(parser.getText())) { + writeDoubleInternal(parser.getDoubleValue()); + } + } + + /** + * Attempts to parse a JSON number as a decimal and write it. The input must meet the following + * criteria: - Be in a valid decimal format (integer with an optional '.'). - Not in scientific + * notation. - Fit within the precision and scale limits of decimal types. Review Comment: Style: lines seem to have been accidentally wrapped. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
