/**
* 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.hadoop.hive.ql.exec.persistence;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
/**
* Unwraps values from current key with valueIndex in mapjoin desc
*/
public class UnwrapRowContainer
implements MapJoinRowContainer, AbstractRowContainer.RowIterator<List<Object>> {
private final byte alias;
private final int[] valueIndex;
private final Converter[] converters;
private final boolean tagged;
private final List<Object> unwrapped;
private transient Object[] currentKey;
private transient MapJoinRowContainer internal;
private transient RowIterator<List<Object>> iterator;
public UnwrapRowContainer(byte alias, int[] valueIndex, Converter[] converters, boolean tagged) {
this.alias = alias;
this.valueIndex = valueIndex;
this.converters = converters;
this.tagged = tagged;
this.unwrapped = new ArrayList<Object>();
}
public MapJoinRowContainer setInternal(MapJoinRowContainer internal, Object[] currentKey) {
this.internal = internal;
this.currentKey = currentKey;
return this;
}
@Override
public List<Object> first() throws HiveException {
iterator = internal.rowIter();
return unwrap(iterator.first());
}
@Override
public List<Object> next() throws HiveException {
return unwrap(iterator.next());
}
private List<Object> unwrap(List<Object> values) {
if (values == null) {
return null;
}
unwrapped.clear();
for (int pos = 0; pos < valueIndex.length; pos++) {
int index = valueIndex[pos];
if (index >= 0) {
if (currentKey == null) {
unwrapped.add(null);
} else if (converters[pos] != null) {
unwrapped.add(converters[pos].convert(currentKey[index]));
} else {
unwrapped.add(currentKey[index]);
}
} else {
unwrapped.add(values.get(-index - 1));
}
}
if (tagged) {
unwrapped.add(values.get(values.size() - 1)); // append filter tag
}
return unwrapped;
}
@Override
public RowIterator<List<Object>> rowIter() throws HiveException {
return this;
}
@Override
public void addRow(List<Object> t) throws HiveException {
internal.addRow(t);
}
@Override
public boolean hasRows() throws HiveException {
return internal.hasRows();
}
@Override
public boolean isSingleRow() throws HiveException {
return internal.isSingleRow();
}
@Override
public int rowCount() throws HiveException {
return internal.rowCount();
}
@Override
public void clearRows() throws HiveException {
internal.clearRows();
}
@Override
public byte getAliasFilter() throws HiveException {
return internal.getAliasFilter();
}
@Override
public MapJoinRowContainer copy() throws HiveException {
internal = internal.copy();
return this;
}
@Override
public void addRow(Object[] value) throws HiveException {
internal.addRow(value);
}
@Override
public void write(MapJoinObjectSerDeContext valueContext, ObjectOutputStream out)
throws IOException, SerDeException {
internal.write(valueContext, out);
}
@Override
public String toString() {
return alias + (tagged ? ":TAGGED" : "") + Arrays.toString(valueIndex);
}
}