jackye1995 commented on a change in pull request #4308: URL: https://github.com/apache/iceberg/pull/4308#discussion_r824208279
########## File path: core/src/main/java/org/apache/iceberg/expressions/ExpressionParser.java ########## @@ -0,0 +1,334 @@ +/* + * 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.expressions; + +import com.fasterxml.jackson.core.JsonGenerator; +import com.fasterxml.jackson.databind.JsonNode; +import com.fasterxml.jackson.databind.ObjectMapper; +import java.io.IOException; +import java.io.StringWriter; +import java.io.UncheckedIOException; +import java.math.BigDecimal; +import java.nio.ByteBuffer; +import java.nio.charset.StandardCharsets; +import java.util.List; +import java.util.Locale; +import java.util.Set; +import java.util.UUID; +import org.apache.iceberg.exceptions.RuntimeIOException; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableSet; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.apache.iceberg.types.Conversions; +import org.apache.iceberg.types.Type; +import org.apache.iceberg.types.Types; +import org.apache.iceberg.util.JsonUtil; + +public class ExpressionParser { + private static final String TYPE = "type"; + private static final String VALUE = "value"; + private static final String OPERATION = "operation"; + private static final String LITERALS = "literals"; + private static final String TERM = "term"; + private static final String LEFT_OPERAND = "left-operand"; + private static final String RIGHT_OPERAND = "right-operand"; + private static final String OPERAND = "operand"; + private static final String AND = "and"; + private static final String OR = "or"; + private static final String NOT = "not"; + private static final String TRUE = "true"; + private static final String FALSE = "false"; + private static final String UNBOUNDED_PREDICATE = "unbounded-predicate"; + private static final String BOUNDED_LITERAL_PREDICATE = "bounded-literal-predicate"; + private static final String BOUNDED_SET_PREDICATE = "bounded-set-predicate"; + private static final String BOUNDED_UNARY_PREDICATE = "bounded-unary-predicate"; + private static final Set<String> PREDICATE_TYPES = Sets.newHashSet( + UNBOUNDED_PREDICATE, + BOUNDED_LITERAL_PREDICATE, + BOUNDED_SET_PREDICATE, + BOUNDED_UNARY_PREDICATE); + private static final String NAMED_REFERENCE = "named-reference"; + private static final String BOUND_REFERENCE = "bound-reference"; + + private static final Set<Expression.Operation> ONE_INPUTS = ImmutableSet.of( + Expression.Operation.IS_NULL, + Expression.Operation.NOT_NULL, + Expression.Operation.IS_NAN, + Expression.Operation.NOT_NAN); + + private ExpressionParser() { + } + + public static String toJson(Expression expression, boolean pretty) { + try { + StringWriter writer = new StringWriter(); + JsonGenerator generator = JsonUtil.factory().createGenerator(writer); + if (pretty) { + generator.useDefaultPrettyPrinter(); + } + toJson(expression, generator); + generator.flush(); + return writer.toString(); + + } catch (IOException e) { + throw new UncheckedIOException("Failed to write json", e); + } + } + + public static void toJson(Expression expression, JsonGenerator generator) throws IOException { + if (expression instanceof And) { + toJson((And) expression, generator); + } else if (expression instanceof Or) { + toJson((Or) expression, generator); + } else if (expression instanceof Not) { + toJson((Not) expression, generator); + } else if (expression instanceof True) { + toJson((True) expression, generator); + } else if (expression instanceof False) { + toJson((False) expression, generator); + } else if (expression instanceof Predicate) { + toJson((Predicate<?, ?>) expression, generator); + } else { + throw new IllegalArgumentException("Invalid Operation Type"); + } + } + + public static void toJson(And expression, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, AND); + generator.writeFieldName(LEFT_OPERAND); + toJson(expression.left(), generator); + generator.writeFieldName(RIGHT_OPERAND); + toJson(expression.right(), generator); + generator.writeEndObject(); + } + + public static void toJson(Or expression, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, OR); + generator.writeFieldName(LEFT_OPERAND); + toJson(expression.left(), generator); + generator.writeFieldName(RIGHT_OPERAND); + toJson(expression.right(), generator); + generator.writeEndObject(); + } + + public static void toJson(Not expression, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, NOT); + generator.writeFieldName(OPERAND); + toJson(expression.child(), generator); + generator.writeEndObject(); + } + + public static void toJson(True expression, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, TRUE); + generator.writeEndObject(); + } + + public static void toJson(False expression, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, FALSE); + generator.writeEndObject(); + } + + public static void toJson(Predicate<?, ?> predicate, JsonGenerator generator) throws IOException { + if (predicate instanceof UnboundPredicate) { + toJson((UnboundPredicate<?>) predicate, generator); + } else { + throw new IllegalArgumentException("Cannot convert predicate " + predicate); + } + } + + public static void toJson(UnboundPredicate<?> predicate, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, UNBOUNDED_PREDICATE); + generator.writeStringField(OPERATION, predicate.op().name().toLowerCase()); + generator.writeFieldName(TERM); + toJson(predicate.term(), generator); + if (!(ONE_INPUTS.contains(predicate.op()))) { + generator.writeFieldName(LITERALS); + generator.writeStartArray(); + for (Literal<?> literal : predicate.literals()) { + toJson(literal, generator); + } + generator.writeEndArray(); + } + + generator.writeEndObject(); + } + + public static void toJson(Term term, JsonGenerator generator) throws IOException { + if (term instanceof NamedReference) { + toJson((NamedReference<?>) term, generator); + } else { + throw new IllegalArgumentException("Cannot convert term " + term); + } + } + + public static void toJson(NamedReference<?> term, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + generator.writeStringField(TYPE, NAMED_REFERENCE); + generator.writeStringField(VALUE, term.name()); + generator.writeEndObject(); + } + + public static void toJson(List<Literal<?>> literals, JsonGenerator generator) throws IOException { + generator.writeStartArray(); + for (int i = 0; i < literals.size(); i++) { + toJson(literals.get(i), generator); + } + generator.writeEndArray(); + } + + public static void toJson(Literal<?> literal, JsonGenerator generator) throws IOException { + generator.writeStartObject(); + + Object value = literal.value(); + Type type; + if (value instanceof Boolean) { + type = Types.BooleanType.get(); + } else if (value instanceof Integer) { + type = Types.IntegerType.get(); + } else if (value instanceof Long) { + type = Types.LongType.get(); + } else if (value instanceof Float) { + type = Types.FloatType.get(); + } else if (value instanceof Double) { + type = Types.DoubleType.get(); + } else if (value instanceof CharSequence) { + type = Types.StringType.get(); + } else if (value instanceof UUID) { + type = Types.UUIDType.get(); + } else if (value instanceof byte[]) { + type = Types.FixedType.ofLength(((byte[]) value).length); + } else if (value instanceof ByteBuffer) { + if (literal instanceof Literals.FixedLiteral) { + type = Types.FixedType.ofLength(((ByteBuffer) value).remaining()); + } else { + type = Types.BinaryType.get(); + } + } else if (value instanceof BigDecimal) { + BigDecimal decimal = (BigDecimal) value; + type = Types.DecimalType.of(decimal.precision(), decimal.scale()); + } else { + throw new IllegalArgumentException("Cannot find literal type for value class " + value.getClass().getName()); + } + + generator.writeStringField(TYPE, type.toString()); + generator.writeStringField(VALUE, StandardCharsets.UTF_8.decode(literal.toByteBuffer()).toString()); + generator.writeEndObject(); + } + + public static Expression fromJson(String json) { + try { + ObjectMapper mapper = new ObjectMapper(); + return fromJson(mapper.readTree(json)); + } catch (IOException e) { + throw new RuntimeIOException(e); + } + } + + public static Expression fromJson(JsonNode json) { + String expressionType = JsonUtil.getString(TYPE, json); + + if (AND.equals(expressionType)) { + return new And(fromJson(json.get(LEFT_OPERAND)), fromJson(json.get(RIGHT_OPERAND))); + } else if (OR.equals(expressionType)) { + return new Or(fromJson(json.get(LEFT_OPERAND)), fromJson(json.get(RIGHT_OPERAND))); + } else if (NOT.equals(expressionType)) { + return new Not(fromJson(json.get(OPERAND))); + } else if (TRUE.equals(expressionType)) { + return True.INSTANCE; + } else if (FALSE.equals(expressionType)) { + return False.INSTANCE; + } else if (PREDICATE_TYPES.contains(expressionType)) { + return fromJsonToPredicate(json, expressionType); + } else { + throw new IllegalArgumentException("Invalid Operation Type"); + } + } + + public static Predicate<?, ?> fromJsonToPredicate(JsonNode json, String predicateType) { + if (UNBOUNDED_PREDICATE.equals(predicateType)) { + return fromJsonUnboundPredicate(json); + } else if (BOUNDED_LITERAL_PREDICATE.equals(predicateType)) { + throw new UnsupportedOperationException( + "Serialization of Predicate type BoundLiteralPredicate is not currently supported."); + } else if (BOUNDED_SET_PREDICATE.equals(predicateType)) { + throw new UnsupportedOperationException( + "Serialization of Predicate type BoundSetPredicate is not currently supported."); + } else if (BOUNDED_UNARY_PREDICATE.equals(predicateType)) { + throw new UnsupportedOperationException( + "Serialization of Predicate type BoundUnaryPredicate is not currently supported."); + } else { + throw new IllegalArgumentException("Invalid Predicate Type"); + } + } + + @SuppressWarnings("CyclomaticComplexity") Review comment: this is not needed? -- This is an automated message from the Apache Git Service. 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