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OrcList.java
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116 lines (105 loc) · 3.11 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.WritableComparable;
import org.apache.orc.TypeDescription;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
/**
* An ArrayList implementation that implements Writable.
* @param <E> the element type, which must be Writable
*/
public class OrcList<E extends WritableComparable>
extends ArrayList<E> implements WritableComparable<OrcList<E>> {
private final TypeDescription childSchema;
public OrcList(TypeDescription schema) {
childSchema = schema.getChildren().get(0);
}
public OrcList(TypeDescription schema, int initialCapacity) {
super(initialCapacity);
childSchema = schema.getChildren().get(0);
}
@Override
public void write(DataOutput output) throws IOException {
Iterator<E> itr = iterator();
output.writeInt(size());
while (itr.hasNext()) {
E obj = itr.next();
output.writeBoolean(obj != null);
if (obj != null) {
obj.write(output);
}
}
}
@Override
public void readFields(DataInput input) throws IOException {
clear();
int size = input.readInt();
ensureCapacity(size);
for(int i=0; i < size; ++i) {
if (input.readBoolean()) {
E obj = (E) OrcStruct.createValue(childSchema);
obj.readFields(input);
add(obj);
} else {
add(null);
}
}
}
@Override
public int compareTo(OrcList<E> other) {
if (other == null) {
return -1;
}
int result = childSchema.compareTo(other.childSchema);
if (result != 0) {
return result;
}
int ourSize = size();
int otherSize = other.size();
for(int e=0; e < ourSize && e < otherSize; ++e) {
E ours = get(e);
E theirs = other.get(e);
if (ours == null) {
if (theirs != null) {
return 1;
}
} else if (theirs == null) {
return -1;
} else {
int val = ours.compareTo(theirs);
if (val != 0) {
return val;
}
}
}
return ourSize - otherSize;
}
@Override
public boolean equals(Object other) {
return other != null && other.getClass() == getClass() &&
compareTo((OrcList<E>) other) == 0;
}
@Override
public int hashCode() {
return super.hashCode();
}
}