@Override
public PCollection<KV<URI, String>> apply(PInput input) {
Pipeline pipeline = input.getPipeline();
// Create one TextIO.Read transform for each document
// and add its output to a PCollectionList
PCollectionList<KV<URI, String>> urisToLines = PCollectionList.empty(pipeline);
// TextIO.Read supports:
// - file: URIs and paths locally
// - gs: URIs on the service
for (final URI uri : uris) {
String uriString;
if (uri.getScheme().equals("file")) {
uriString = new File(uri).getPath();
} else {
uriString = uri.toString();
}
PCollection<KV<URI, String>> oneUriToLines =
pipeline
.apply(TextIO.Read.from(uriString).named("TextIO.Read(" + uriString + ")"))
.apply(WithKeys.<URI, String>of(uri).setName("WithKeys(" + uriString + ")"));
urisToLines = urisToLines.and(oneUriToLines);
}
return urisToLines.apply(Flatten.<KV<URI, String>>pCollections());
}
@Override
public PCollection<T> apply(PInput input) {
if (filepattern == null) {
throw new IllegalStateException(
"need to set the filepattern of an AvroIO.Read transform");
}
if (schema == null) {
throw new IllegalStateException("need to set the schema of an AvroIO.Read transform");
}
if (validate) {
try {
checkState(
!IOChannelUtils.getFactory(filepattern).match(filepattern).isEmpty(),
"Unable to find any files matching %s",
filepattern);
} catch (IOException e) {
throw new IllegalStateException(String.format("Failed to validate %s", filepattern), e);
}
}
@SuppressWarnings("unchecked")
Bounded<T> read =
type == GenericRecord.class
? (Bounded<T>)
com.google.cloud.dataflow.sdk.io.Read.from(
AvroSource.from(filepattern).withSchema(schema))
: com.google.cloud.dataflow.sdk.io.Read.from(
AvroSource.from(filepattern).withSchema(type));
PCollection<T> pcol = input.getPipeline().apply("Read", read);
// Honor the default output coder that would have been used by this PTransform.
pcol.setCoder(getDefaultOutputCoder());
return pcol;
}
@Override
public PCollection<T> apply(PInput input) {
if (topic == null && subscription == null) {
throw new IllegalStateException(
"need to set either the topic or the subscription for "
+ "a PubsubIO.Read transform");
}
if (topic != null && subscription != null) {
throw new IllegalStateException(
"Can't set both the topic and the subscription for a " + "PubsubIO.Read transform");
}
return PCollection.<T>createPrimitiveOutputInternal(
input.getPipeline(), WindowingStrategy.globalDefault(), IsBounded.UNBOUNDED)
.setCoder(coder);
}
@Override
public PCollection<KV<K, V>> apply(PInput input) {
return PCollection.createPrimitiveOutputInternal(
input.getPipeline(), WindowingStrategy.globalDefault(), PCollection.IsBounded.BOUNDED);
}