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/*
* SonarQube
* Copyright (C) 2009-2016 SonarSource SA
* mailto:contact AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.api.utils;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.io.Files;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.sonar.api.batch.ScannerSide;
import org.sonar.api.ce.ComputeEngineSide;
import org.sonar.api.server.ServerSide;
/**
* Reads different types of URI. Supported schemes are http and file.
*
* @since 3.2
*/
@ScannerSide
@ServerSide
@ComputeEngineSide
public class UriReader {
private final Map<String, SchemeProcessor> processorsByScheme = Maps.newHashMap();
public UriReader(SchemeProcessor[] processors) {
List<SchemeProcessor> allProcessors = Lists.asList(new FileProcessor(), processors);
for (SchemeProcessor processor : allProcessors) {
for (String scheme : processor.getSupportedSchemes()) {
processorsByScheme.put(scheme.toLowerCase(Locale.ENGLISH), processor);
}
}
}
/**
* Reads all bytes from uri. It throws an unchecked exception if an error occurs.
*/
public byte[] readBytes(URI uri) {
return searchForSupportedProcessor(uri).readBytes(uri);
}
/**
* Reads all characters from uri, using the given character set.
* It throws an unchecked exception if an error occurs.
*/
public String readString(URI uri, Charset charset) {
return searchForSupportedProcessor(uri).readString(uri, charset);
}
/**
* Returns a detailed description of the given uri. For example HTTP URIs are completed
* with the configured HTTP proxy.
*/
public String description(URI uri) {
SchemeProcessor reader = searchForSupportedProcessor(uri);
return reader.description(uri);
}
@VisibleForTesting
SchemeProcessor searchForSupportedProcessor(URI uri) {
SchemeProcessor processor = processorsByScheme.get(uri.getScheme().toLowerCase(Locale.ENGLISH));
Preconditions.checkArgument(processor != null, "URI schema is not supported: " + uri.getScheme());
return processor;
}
public abstract static class SchemeProcessor {
protected abstract String[] getSupportedSchemes();
protected abstract byte[] readBytes(URI uri);
protected abstract String readString(URI uri, Charset charset);
protected abstract String description(URI uri);
}
/**
* This implementation is not exposed in API and is kept private.
*/
private static class FileProcessor extends SchemeProcessor {
@Override
public String[] getSupportedSchemes() {
return new String[] {"file"};
}
@Override
protected byte[] readBytes(URI uri) {
try {
return Files.toByteArray(new File(uri));
} catch (IOException e) {
throw Throwables.propagate(e);
}
}
@Override
protected String readString(URI uri, Charset charset) {
try {
return Files.toString(new File(uri), charset);
} catch (IOException e) {
throw Throwables.propagate(e);
}
}
@Override
protected String description(URI uri) {
return new File(uri).getAbsolutePath();
}
}
}
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