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URLs.java
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/*
* 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.
*
* Copyright 2012-2020 the original author or authors.
*/
package org.assertj.core.util;
import static java.util.Objects.requireNonNull;
import static org.assertj.core.util.Preconditions.checkArgument;
import java.io.*;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.List;
import java.util.stream.Collectors;
/**
* Utility methods related to URLs.
*
* @author Turbo87
* @author dorzey
*/
public class URLs {
private URLs() {
}
/**
* Loads the text content of a URL into a character string.
*
* @param url the URL.
* @param charsetName the name of the character set to use.
* @return the content of the file.
* @throws IllegalArgumentException if the given character set is not supported on this platform.
* @throws UncheckedIOException if an I/O exception occurs.
*/
public static String contentOf(URL url, String charsetName) {
checkArgumentCharsetIsSupported(charsetName);
return contentOf(url, Charset.forName(charsetName));
}
/**
* Loads the text content of a URL into a character string.
*
* @param url the URL.
* @param charset the character set to use.
* @return the content of the URL.
* @throws NullPointerException if the given charset is {@code null}.
* @throws UncheckedIOException if an I/O exception occurs.
*/
public static String contentOf(URL url, Charset charset) {
requireNonNull(charset, "The charset should not be null");
try {
return loadContents(url.openStream(), charset);
} catch (IOException e) {
throw new UncheckedIOException("Unable to read " + url, e);
}
}
/**
* Loads the text content of a URL into a list of strings, each string corresponding to a line. The line endings are
* either \n, \r or \r\n.
*
* @param url the URL.
* @param charset the character set to use.
* @return the content of the URL.
* @throws NullPointerException if the given charset is {@code null}.
* @throws UncheckedIOException if an I/O exception occurs.
*/
public static List<String> linesOf(URL url, Charset charset) {
requireNonNull(charset, "The charset should not be null");
try {
return loadLines(url.openStream(), charset);
} catch (IOException e) {
throw new UncheckedIOException("Unable to read " + url, e);
}
}
/**
* Loads the text content of a URL into a list of strings, each string corresponding to a line. The line endings are
* either \n, \r or \r\n.
*
* @param url the URL.
* @param charsetName the name of the character set to use.
* @return the content of the URL.
* @throws NullPointerException if the given charset is {@code null}.
* @throws UncheckedIOException if an I/O exception occurs.
*/
public static List<String> linesOf(URL url, String charsetName) {
checkArgumentCharsetIsSupported(charsetName);
return linesOf(url, Charset.forName(charsetName));
}
private static String loadContents(InputStream stream, Charset charset) throws IOException {
try (StringWriter writer = new StringWriter();
BufferedReader reader = new BufferedReader(new InputStreamReader(stream, charset))) {
int c;
while ((c = reader.read()) != -1) {
writer.write(c);
}
return writer.toString();
}
}
private static List<String> loadLines(InputStream stream, Charset charset) throws IOException {
try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream, charset))) {
return reader.lines().collect(Collectors.toList());
}
}
private static void checkArgumentCharsetIsSupported(String charsetName) {
checkArgument(Charset.isSupported(charsetName), "Charset:<'%s'> is not supported on this system", charsetName);
}
}