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/*
* ============LICENSE_START=======================================================
* ONAP : ccsdk features
* ================================================================================
* Copyright (C) 2019 highstreet technologies GmbH Intellectual Property.
* All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*
*/
package org.onap.ccsdk.features.sdnr.wt.dataprovider.http.yangschema;
import java.io.File;
import java.io.FileInputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Path;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class YangFileProvider {
private static final Logger LOG = LoggerFactory.getLogger(YangFileProvider.class);
private static final FilenameFilter yangFilenameFilter = new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.toLowerCase().endsWith(".yang");
}
};
private static final int BUFFER_SIZE = 1024;
private final Path mainSourcePath;
private final List<Path> additionalSources;
public YangFileProvider(String path) {
this.mainSourcePath = new File(path).toPath();
this.additionalSources = new ArrayList<>();
}
public boolean hasFileForModule(String module, String version) {
return this.mainSourcePath.resolve(YangFilename.createFilename(module, version)).toFile().exists();
}
public boolean hasFileForModule(String module) {
return this.findYangFiles(module).size() > 0;
}
private List<YangFilename> findYangFiles(String module) {
LOG.debug("try to find yang files for {}", module);
List<YangFilename> list = new ArrayList<>();
String[] files = this.mainSourcePath.toFile().list(yangFilenameFilter);
YangFilename yangfile;
for (String fn : files) {
try {
yangfile = new YangFilename(this.mainSourcePath.resolve(fn).toString());
if (yangfile.getModule().equals(module)) {
list.add(yangfile);
}
} catch (ParseException e) {
LOG.warn("unable to handle yangfile {}: {}", fn, e);
}
}
for (Path addPath : this.additionalSources) {
files = addPath.toFile().list(yangFilenameFilter);
for (String file : files) {
try {
yangfile = new YangFilename(addPath.resolve(file).toString());
if (yangfile.getModule().equals(module)) {
list.add(yangfile);
}
} catch (ParseException e) {
LOG.warn("unable to handle yangfile {}: {}", file, e);
}
}
}
return list;
}
/**
* get yang file from source with specified version or least newer one if version is null then the latest one
*
* @param module
* @param version
* @return
* @throws ParseException
*/
private @Nullable YangFilename getYangFile(@Nonnull String module, @Nullable String version) throws ParseException {
YangFilename f = null;
List<YangFilename> list = this.findYangFiles(module);
list.sort(SortByDateAscComparator.getInstance());
// find specific version or nearest oldest
if (version != null) {
Date rev = YangFilename.parseRevision(version);
for (YangFilename item : list) {
if (rev.equals(item.getRevision())) {
f = item;
break;
}
if (item.getRevision().after(rev)) {
f = item;
break;
}
}
}
// get latest
else {
f = list.get(list.size() - 1);
}
return f;
}
/**
* write filestream directly to output stream easier for http handling
*
* @param module
* @param version
* @param outputStream
* @return
* @throws IOException
* @throws ParseException
*/
public int writeOutput(@Nonnull String module, @Nullable String version, @Nonnull OutputStream outputStream)
throws IOException, ParseException {
YangFilename fn = this.getYangFile(module, version);
if (fn == null) {
return 0;
}
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = -1;
int sumlen = 0;
InputStream inputStream = null;
try {
inputStream = new FileInputStream(fn.getFilename());
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
sumlen += bytesRead;
}
} catch (IOException e) {
LOG.warn("problem sending {}: {}", fn.getFilename(), e);
} finally {
if (inputStream != null) {
inputStream.close();
}
}
return sumlen;
}
private static class SortByDateAscComparator implements Comparator<YangFilename> {
private static SortByDateAscComparator instance;
@Override
public int compare(YangFilename o1, YangFilename o2) {
return o1.getRevision().compareTo(o2.getRevision());
}
public static Comparator<YangFilename> getInstance() {
if (instance == null) {
instance = new SortByDateAscComparator();
}
return instance;
}
}
public YangFilename getFileForModule(String module, String rev) throws ParseException {
return this.getYangFile(module, rev);
}
public YangFilename getFileForModule(String module) throws ParseException {
return this.getFileForModule(module, null);
}
public boolean hasFileOrNewerForModule(String module, String version) throws ParseException {
return this.getYangFile(module, version) != null;
}
}
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