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OrcUnion.java
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123 lines (109 loc) · 3.07 KB
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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.
*/
package org.apache.orc.mapred;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.orc.TypeDescription;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* An in-memory representation of a union type.
*/
public final class OrcUnion implements WritableComparable<OrcUnion> {
private byte tag;
private WritableComparable object;
private final TypeDescription schema;
public OrcUnion(TypeDescription schema) {
this.schema = schema;
}
public void set(int tag, WritableComparable object) {
this.tag = (byte) tag;
this.object = object;
}
public byte getTag() {
return tag;
}
public Writable getObject() {
return object;
}
@Override
public boolean equals(Object other) {
if (other == null || other.getClass() != OrcUnion.class) {
return false;
}
OrcUnion oth = (OrcUnion) other;
if (tag != oth.tag) {
return false;
} else if (object == null) {
return oth.object == null;
} else {
return object.equals(oth.object);
}
}
@Override
public int hashCode() {
int result = tag;
if (object != null) {
result ^= object.hashCode();
}
return result;
}
@Override
public String toString() {
return "uniontype(" + Integer.toString(tag & 0xff) + ", " + object + ")";
}
@Override
public void write(DataOutput output) throws IOException {
output.writeByte(tag);
output.writeBoolean(object != null);
if (object != null) {
object.write(output);
}
}
@Override
public void readFields(DataInput input) throws IOException {
byte oldTag = tag;
tag = input.readByte();
if (input.readBoolean()) {
if (oldTag != tag || object == null) {
object = OrcStruct.createValue(schema.getChildren().get(tag));
}
object.readFields(input);
} else {
object = null;
}
}
@Override
public int compareTo(OrcUnion other) {
if (other == null) {
return -1;
}
int result = schema.compareTo(other.schema);
if (result != 0) {
return result;
}
if (tag != other.tag) {
return tag - other.tag;
}
if (object == null) {
return other.object == null ? 0 : 1;
}
return object.compareTo(other.object);
}
}