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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.drill.exec.physical.impl.validate;
import java.util.Iterator;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.record.BatchSchema;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.TypedFieldId;
import org.apache.drill.exec.record.VectorContainer;
import org.apache.drill.exec.record.VectorWrapper;
import org.apache.drill.exec.record.WritableBatch;
import org.apache.drill.exec.record.selection.SelectionVector2;
import org.apache.drill.exec.record.selection.SelectionVector4;
import org.apache.drill.exec.vector.VectorValidator;
public class IteratorValidatorBatchIterator implements RecordBatch {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(IteratorValidatorBatchIterator.class);
static final boolean VALIDATE_VECTORS = false;
private IterOutcome state = IterOutcome.NOT_YET;
private final RecordBatch incoming;
private boolean first = true;
public IteratorValidatorBatchIterator(RecordBatch incoming) {
this.incoming = incoming;
}
private void validateReadState() {
switch (state) {
case OK:
case OK_NEW_SCHEMA:
return;
default:
throw new IllegalStateException(
String
.format(
"You tried to do a batch data read operation when you were in a state of %s. You can only do this type of operation when you are in a state of OK or OK_NEW_SCHEMA.",
state.name()));
}
}
@Override
public Iterator<VectorWrapper<?>> iterator() {
validateReadState();
return incoming.iterator();
}
@Override
public FragmentContext getContext() {
return incoming.getContext();
}
@Override
public BatchSchema getSchema() {
return incoming.getSchema();
}
@Override
public int getRecordCount() {
validateReadState();
return incoming.getRecordCount();
}
@Override
public void kill(boolean sendUpstream) {
incoming.kill(sendUpstream);
}
@Override
public SelectionVector2 getSelectionVector2() {
validateReadState();
return incoming.getSelectionVector2();
}
@Override
public SelectionVector4 getSelectionVector4() {
validateReadState();
return incoming.getSelectionVector4();
}
@Override
public TypedFieldId getValueVectorId(SchemaPath path) {
validateReadState();
return incoming.getValueVectorId(path);
}
@Override
public VectorWrapper<?> getValueAccessorById(Class<?> clazz, int... ids) {
validateReadState();
return incoming.getValueAccessorById(clazz, ids);
}
@Override
public IterOutcome next() {
if(state == IterOutcome.NONE ) throw new IllegalStateException("The incoming iterator has previously moved to a state of NONE. You should not be attempting to call next() again.");
state = incoming.next();
if (first && state == IterOutcome.NONE) {
throw new IllegalStateException("The incoming iterator returned a state of NONE on the first batch. There should always be at least one batch output before returning NONE");
}
if (first && state == IterOutcome.OK) {
throw new IllegalStateException("The incoming iterator returned a state of OK on the first batch. There should always be a new schema on the first batch. Incoming: " + incoming.getClass().getName());
}
if (first) first = !first;
if(state == IterOutcome.OK || state == IterOutcome.OK_NEW_SCHEMA) {
BatchSchema schema = incoming.getSchema();
if(schema.getFieldCount() == 0){
throw new IllegalStateException ("Incoming batch has an empty schema. This is not allowed.");
}
if(incoming.getRecordCount() > MAX_BATCH_SIZE){
throw new IllegalStateException (String.format("Incoming batch of %s has size %d, which is beyond the limit of %d", incoming.getClass().getName(), incoming.getRecordCount(), MAX_BATCH_SIZE));
}
if (VALIDATE_VECTORS) {
VectorValidator.validate(incoming);
}
// int valueCount = incoming.getRecordCount();
// for (VectorWrapper vw : incoming) {
// assert valueCount == vw.getValueVector().getAccessor().getValueCount() : "Count of values in each vector within this batch does not match.";
// }
}
return state;
}
@Override
public WritableBatch getWritableBatch() {
validateReadState();
return incoming.getWritableBatch();
}
@Override
public void cleanup() {
incoming.cleanup();
}
@Override
public VectorContainer getOutgoingContainer() {
throw new UnsupportedOperationException(String.format(" You should not call getOutgoingContainer() for class %s", this.getClass().getCanonicalName()));
}
}
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