| /* |
| * 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 org.apache.iceberg.relocated.com.google.common.base.Preconditions; |
| import org.apache.iceberg.transforms.Transform; |
| |
| /** |
| * A struct of partition values. |
| * <p> |
| * Instances of this class can produce partition values from a data row passed to {@link #partition(StructLike)}. |
| */ |
| public class PartitionKey implements StructLike, Serializable { |
| |
| private final PartitionSpec spec; |
| private final int size; |
| private final Object[] partitionTuple; |
| private final Transform[] transforms; |
| private final Accessor<StructLike>[] accessors; |
| |
| @SuppressWarnings("unchecked") |
| public PartitionKey(PartitionSpec spec, Schema inputSchema) { |
| this.spec = spec; |
| |
| List<PartitionField> fields = spec.fields(); |
| this.size = fields.size(); |
| this.partitionTuple = new Object[size]; |
| this.transforms = new Transform[size]; |
| this.accessors = (Accessor<StructLike>[]) Array.newInstance(Accessor.class, size); |
| |
| Schema schema = spec.schema(); |
| for (int i = 0; i < size; i += 1) { |
| PartitionField field = fields.get(i); |
| Accessor<StructLike> accessor = inputSchema.accessorForField(field.sourceId()); |
| Preconditions.checkArgument(accessor != null, |
| "Cannot build accessor for field: " + schema.findField(field.sourceId())); |
| this.accessors[i] = accessor; |
| this.transforms[i] = field.transform(); |
| } |
| } |
| |
| private PartitionKey(PartitionKey toCopy) { |
| this.spec = toCopy.spec; |
| this.size = toCopy.size; |
| this.partitionTuple = new Object[toCopy.partitionTuple.length]; |
| this.transforms = toCopy.transforms; |
| this.accessors = toCopy.accessors; |
| |
| System.arraycopy(toCopy.partitionTuple, 0, this.partitionTuple, 0, partitionTuple.length); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("["); |
| for (int i = 0; i < partitionTuple.length; i += 1) { |
| if (i > 0) { |
| sb.append(", "); |
| } |
| sb.append(partitionTuple[i]); |
| } |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| public PartitionKey copy() { |
| return new PartitionKey(this); |
| } |
| |
| public String toPath() { |
| return spec.partitionToPath(this); |
| } |
| |
| /** |
| * Replace this key's partition values with the partition values for the row. |
| * |
| * @param row a StructLike row |
| */ |
| @SuppressWarnings("unchecked") |
| public void partition(StructLike row) { |
| for (int i = 0; i < partitionTuple.length; i += 1) { |
| Transform<Object, Object> transform = transforms[i]; |
| partitionTuple[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(partitionTuple[pos]); |
| } |
| |
| @Override |
| public <T> void set(int pos, T value) { |
| partitionTuple[pos] = value; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } else if (!(o instanceof PartitionKey)) { |
| return false; |
| } |
| |
| PartitionKey that = (PartitionKey) o; |
| return Arrays.equals(partitionTuple, that.partitionTuple); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Arrays.hashCode(partitionTuple); |
| } |
| } |