126 lines
4.1 KiB
Java
126 lines
4.1 KiB
Java
/*
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* ******************************************************************************
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* *
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* *
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* * This program and the accompanying materials are made available under the
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* * terms of the Apache License, Version 2.0 which is available at
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* * https://www.apache.org/licenses/LICENSE-2.0.
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* *
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* * See the NOTICE file distributed with this work for additional
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* * information regarding copyright ownership.
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* * Unless required by applicable law or agreed to in writing, software
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* * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* * License for the specific language governing permissions and limitations
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* * under the License.
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* *
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* * SPDX-License-Identifier: Apache-2.0
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* *****************************************************************************
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*/
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package org.datavec.api.split;
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import lombok.NonNull;
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import org.nd4j.common.collection.CompactHeapStringList;
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import java.io.*;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.util.Iterator;
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public class TransformSplit extends BaseInputSplit {
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private final BaseInputSplit sourceSplit;
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private final URITransform transform;
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/**
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* Apply a given transformation to the raw URI objects
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*
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* @param sourceSplit the split with URIs to transform
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* @param transform transform operation that returns a new URI based on an input URI
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* @throws URISyntaxException thrown if the transformed URI is malformed
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*/
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public TransformSplit(@NonNull BaseInputSplit sourceSplit, @NonNull URITransform transform)
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throws URISyntaxException {
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this.sourceSplit = sourceSplit;
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this.transform = transform;
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initialize();
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}
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/**
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* Static factory method, replace the string version of the URI with a simple search-replace pair
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*
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* @param sourceSplit the split with URIs to transform
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* @param search the string to search
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* @param replace the string to replace with
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* @throws URISyntaxException thrown if the transformed URI is malformed
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*/
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public static TransformSplit ofSearchReplace(@NonNull BaseInputSplit sourceSplit, @NonNull final String search,
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@NonNull final String replace) throws URISyntaxException {
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return new TransformSplit(sourceSplit, new URITransform() {
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@Override
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public URI apply(URI uri) throws URISyntaxException {
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return new URI(uri.toString().replace(search, replace));
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}
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});
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}
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private void initialize() throws URISyntaxException {
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length = sourceSplit.length();
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uriStrings = new CompactHeapStringList();
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Iterator<URI> iter = sourceSplit.locationsIterator();
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while (iter.hasNext()) {
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URI uri = iter.next();
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uri = transform.apply(uri);
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uriStrings.add(uri.toString());
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}
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}
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@Override
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public void updateSplitLocations(boolean reset) {
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sourceSplit.updateSplitLocations(reset);
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}
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@Override
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public boolean needsBootstrapForWrite() {
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return sourceSplit.needsBootstrapForWrite();
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}
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@Override
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public void bootStrapForWrite() {
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sourceSplit.bootStrapForWrite();
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}
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@Override
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public OutputStream openOutputStreamFor(String location) throws Exception {
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return sourceSplit.openOutputStreamFor(location);
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}
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@Override
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public InputStream openInputStreamFor(String location) throws Exception {
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return sourceSplit.openInputStreamFor(location);
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}
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@Override
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public void reset() {
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//No op: BaseInputSplit doesn't support randomization directly, and TransformSplit doesn't either
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}
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@Override
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public boolean resetSupported() {
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return true;
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}
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/**
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* Close input/ output streams if any
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*/
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@Override
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public void close() throws Exception {
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sourceSplit.close();
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}
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public interface URITransform {
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URI apply(URI uri) throws URISyntaxException;
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}
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}
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