/**
* 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.crunch.types.writable;
import java.util.List;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.crunch.MapFn;
import org.apache.crunch.io.ReadableSourceTarget;
import org.apache.crunch.io.seq.SeqFileSourceTarget;
import org.apache.crunch.types.Converter;
import org.apache.crunch.types.DeepCopier;
import org.apache.crunch.types.PType;
import org.apache.crunch.types.PTypeFamily;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import com.google.common.collect.ImmutableList;
public class WritableType<T, W extends Writable> implements PType<T> {
private final Class<T> typeClass;
private final Class<W> writableClass;
private final Converter converter;
private final MapFn<W, T> inputFn;
private final MapFn<T, W> outputFn;
private final DeepCopier<W> deepCopier;
private final List<PType> subTypes;
private boolean initialized = false;
public WritableType(Class<T> typeClass, Class<W> writableClass, MapFn<W, T> inputDoFn,
MapFn<T, W> outputDoFn, PType... subTypes) {
this.typeClass = typeClass;
this.writableClass = writableClass;
this.inputFn = inputDoFn;
this.outputFn = outputDoFn;
this.converter = new WritableValueConverter(writableClass);
this.deepCopier = new WritableDeepCopier<W>(writableClass);
this.subTypes = ImmutableList.<PType> builder().add(subTypes).build();
}
@Override
public PTypeFamily getFamily() {
return WritableTypeFamily.getInstance();
}
@Override
public Class<T> getTypeClass() {
return typeClass;
}
@Override
public Converter getConverter() {
return converter;
}
@Override
public MapFn getInputMapFn() {
return inputFn;
}
@Override
public MapFn getOutputMapFn() {
return outputFn;
}
@Override
public List<PType> getSubTypes() {
return subTypes;
}
public Class<W> getSerializationClass() {
return writableClass;
}
@Override
public ReadableSourceTarget<T> getDefaultFileSource(Path path) {
return new SeqFileSourceTarget<T>(path, this);
}
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof WritableType)) {
return false;
}
WritableType wt = (WritableType) obj;
return (typeClass.equals(wt.typeClass) && writableClass.equals(wt.writableClass) && subTypes
.equals(wt.subTypes));
}
@Override
public void initialize(Configuration conf) {
this.inputFn.setConfiguration(conf);
this.outputFn.setConfiguration(conf);
this.inputFn.initialize();
this.outputFn.initialize();
for (PType subType : subTypes) {
subType.initialize(conf);
}
this.initialized = true;
}
@Override
public T getDetachedValue(T value) {
if (!initialized) {
throw new IllegalStateException("Cannot call getDetachedValue on an uninitialized PType");
}
W writableValue = outputFn.map(value);
W deepCopy = this.deepCopier.deepCopy(writableValue);
return inputFn.map(deepCopy);
}
@Override
public int hashCode() {
HashCodeBuilder hcb = new HashCodeBuilder();
hcb.append(typeClass).append(writableClass).append(subTypes);
return hcb.toHashCode();
}
}