RussellSpitzer commented on code in PR #7798: URL: https://github.com/apache/iceberg/pull/7798#discussion_r1370461928
########## api/src/main/java/org/apache/iceberg/StructTransform.java: ########## @@ -0,0 +1,149 @@ +/* + * 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; + +import java.io.Serializable; +import java.lang.reflect.Array; +import java.util.Arrays; +import java.util.List; +import java.util.function.Function; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.transforms.Transform; +import org.apache.iceberg.util.SerializableFunction; + +/** + * A struct of flattened transformed values. + * + * <p>Instances of this class can produce transformed values from a row passed to {@link + * #wrap(StructLike)}. + */ +class StructTransform implements StructLike, Serializable { + + private final int size; + private final Accessor<StructLike>[] accessors; + + @SuppressWarnings("rawtypes") + private final SerializableFunction[] transforms; + + private final Object[] transformedTuple; + + StructTransform(Schema schema, List<FieldTransform> fieldTransforms) { + Preconditions.checkArgument(fieldTransforms != null, "Invalid field transform list: null"); + + this.size = fieldTransforms.size(); + this.accessors = (Accessor<StructLike>[]) Array.newInstance(Accessor.class, size); + this.transforms = new SerializableFunction[size]; + + for (int i = 0; i < size; ++i) { + int sourceFieldId = fieldTransforms.get(i).sourceFieldId(); + Transform<?, ?> transform = fieldTransforms.get(i).transform(); + Accessor<StructLike> accessor = schema.accessorForField(sourceFieldId); + Preconditions.checkArgument( + accessor != null, "Cannot build accessor for field: " + schema.findField(sourceFieldId)); + this.accessors[i] = accessor; + this.transforms[i] = transform.bind(accessor.type()); + } + + this.transformedTuple = new Object[size]; + } + + StructTransform(StructTransform toCopy) { + this.size = toCopy.size; + this.accessors = toCopy.accessors; + this.transforms = toCopy.transforms; + + this.transformedTuple = new Object[size]; + System.arraycopy(toCopy.transformedTuple, 0, this.transformedTuple, 0, size); + } + + public void wrap(StructLike row) { + for (int i = 0; i < transformedTuple.length; i += 1) { + Function<Object, Object> transform = transforms[i]; + transformedTuple[i] = transform.apply(accessors[i].get(row)); + } + } + + @Override + public int size() { + return size; + } + + @Override + public <T> T get(int pos, Class<T> javaClass) { + return javaClass.cast(transformedTuple[pos]); + } + + @Override + public <T> void set(int pos, T value) { + transformedTuple[pos] = value; + } + + @Override + public String toString() { + StringBuilder sb = new StringBuilder(); + sb.append("["); + for (int i = 0; i < transformedTuple.length; i += 1) { + if (i > 0) { + sb.append(", "); + } + sb.append(transformedTuple[i]); + } + sb.append("]"); + return sb.toString(); + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } else if (!(o instanceof StructTransform)) { + return false; + } + + StructTransform that = (StructTransform) o; + return Arrays.equals(transformedTuple, that.transformedTuple); + } + + @Override + public int hashCode() { + return Arrays.hashCode(transformedTuple); + } + + /** + * Simple POJO for source field id and transform function. {@code Pair} class is not usable here + * in API module, as it has Avro dep and lives in core module. Review Comment: as it has a Avro dep and is in the core module. -- 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
