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com.bluecatcode.common.io.Files Maven / Gradle / Ivy
package com.bluecatcode.common.io;
import com.bluecatcode.common.functions.Consumer;
import com.google.common.annotations.Beta;
import com.google.common.base.Charsets;
import com.google.common.io.CharSource;
import java.io.*;
import java.nio.charset.Charset;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.nullToEmpty;
import static java.lang.String.format;
/**
* @see com.google.common.io.Files
* @since 1.0
*/
@Beta
public class Files {
private static final Logger log = Logger.getLogger(Files.class.getName());
private Files() {
throw new UnsupportedOperationException();
}
/**
* Loads properties from file path
* @param path the path to properties file
* @return the loaded properties
*/
public static Properties getFileAsProperties(String path) {
File file = new File(nullToEmpty(path));
return getFileAsProperties(file);
}
/**
* Loads properties from file
* @param file the properties file
* @return the loaded properties
*
* @since 1.0.4
*/
public static Properties getFileAsProperties(File file) {
checkFileExists(file);
Properties properties = new Properties();
try (InputStream stream = new FileInputStream(file)) {
properties.load(stream);
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
return properties;
}
public static void checkFilesExist(File... files) {
for (File file : files) {
checkFileExists(file);
}
}
public static void checkFilesExist(String... paths) {
for (String path : paths) {
checkFileExists(path);
}
}
public static void checkFileExists(String path) {
File file = new File(nullToEmpty(path));
checkFileExists(file);
}
public static void checkFileExists(File file) {
checkArgument(file != null, "Expected non-null file");
//noinspection ConstantConditions
File parentFile = file.getParentFile();
String fileMessage = format("%s; exists: %s, can read: %s", file, file.exists(), file.canRead());
String parentFileMessage = (parentFile == null) ? "" :
format(", dir exists: %s, dir can read: %s", parentFile.exists(), parentFile.canRead());
log.log(Level.FINE, fileMessage + parentFileMessage);
checkArgument(file.exists(), "File doesn't exist: '%s'", file);
checkArgument(file.isFile(), "File isn't normal file: '%s'", file);
checkArgument(file.canRead(), "File can't be read: '%s'", file);
checkArgument(parentFile != null, "File parent is null");
//noinspection ConstantConditions
checkArgument(parentFile.exists(), "File parent doesn't exist: '%s'", parentFile);
checkArgument(parentFile.canRead(), "File parent can't be read: '%s'", parentFile);
}
public static void consumeLines(File file, Consumer consumer) {
consumeLines(file, Charsets.UTF_8, consumer);
}
public static void consumeLines(File file, Charset charset, Consumer consumer) {
try {
CharSource charSource = com.google.common.io.Files.asCharSource(file, charset);
try (BufferedReader bufferedReader = charSource.openBufferedStream()) {
for (String line; (line = bufferedReader.readLine()) != null; ) {
try {
consumer.accept(line);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
}
public static void write(CharSequence from, File to) throws IOException {
write(from, to, Charsets.UTF_8);
}
public static void write(CharSequence from, File to, Charset charset) throws IOException {
com.google.common.io.Files.write(from, to, charset);
}
public static void append(CharSequence from, File to) throws IOException {
append(from, to, Charsets.UTF_8);
}
public static void append(CharSequence from, File to, Charset charset) throws IOException {
com.google.common.io.Files.append(from, to, charset);
}
}