/
RangeFieldPartitioner.java
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/
RangeFieldPartitioner.java
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/**
* Copyright 2013 Cloudera Inc.
*
* Licensed 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 com.cloudera.data.partition;
import java.util.Arrays;
import java.util.List;
import com.cloudera.data.FieldPartitioner;
import com.google.common.annotations.Beta;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
@Beta
public class RangeFieldPartitioner extends FieldPartitioner {
private final List<Comparable<?>> upperBounds;
public RangeFieldPartitioner(String name, Comparable<?>... upperBounds) {
super(name, upperBounds.length);
this.upperBounds = Arrays.asList(upperBounds);
}
@Override
public Object apply(Object value) {
Preconditions.checkArgument(value instanceof Comparable<?>,
"Unable to range partition a value that isn't comparable:%s", value);
@SuppressWarnings("unchecked")
Comparable<? super Object> val = (Comparable<? super Object>) value;
for (Comparable<?> comparable : upperBounds) {
if (val.compareTo(comparable) <= 0) {
return comparable;
}
}
throw new IllegalArgumentException(value + " is outside bounds");
}
@Override
public Object valueFromString(String stringValue) {
return stringValue; // TODO: need more type information
}
public List<Comparable<?>> getUpperBounds() {
return upperBounds;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || !getClass().equals(o.getClass())) {
return false;
}
RangeFieldPartitioner that = (RangeFieldPartitioner) o;
return Objects.equal(this.getName(), that.getName()) &&
Objects.equal(this.upperBounds, that.upperBounds);
}
@Override
public int hashCode() {
return Objects.hashCode(getName(), upperBounds);
}
@Override
public String toString() {
return Objects.toStringHelper(this).add("name", getName())
.add("upperBounds", upperBounds).toString();
}
}