Append a record to the end of a text file: Difference between revisions

Content added Content deleted
m (remove bogus template markup)
(→‎{{header|Java}}: code cleanup, consistent indentation)
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=={{header|Java}}==
=={{header|Java}}==


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<lang java>import static java.util.Objects.requireNonNull;
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<lang java>
import static java.lang.Integer.parseInt;
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import static java.nio.file.StandardOpenOption.APPEND;
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import static java.util.Arrays.asList;
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import static java.util.Arrays.stream;
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import static java.util.Objects.requireNonNull;
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import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;


import java.io.IOException;
import java.io.IOException;
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import java.nio.file.Path;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Paths;
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import java.nio.file.StandardOpenOption;
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import java.util.Arrays;
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import java.util.Collections;
import java.util.List;
import java.util.List;
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import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.Stream;


public class RecordAppender {
public class RecordAppender {
static class Record {
static class Record {
private final String account;
private final String account;
private final String password;
private final String password;
private final int uid;
private final int uid;
private final int gid;
private final int gid;
private final List<String> gecos;
private final List<String> gecos;
private final String directory;
private final String directory;
private final String shell;
private final String shell;

public Record(String account, String password, int uid, int gid, List<String> gecos, String directory, String shell) {
public Record(String account, String password, int uid, int gid, List<String> gecos, String directory, String shell) {
this.account = requireNonNull(account);
this.account = requireNonNull(account);
this.password = requireNonNull(password);
this.password = requireNonNull(password);
this.uid = uid;
this.uid = uid;
this.gid = gid;
this.gid = gid;
this.gecos = requireNonNull(gecos);
this.gecos = requireNonNull(gecos);
this.directory = requireNonNull(directory);
this.directory = requireNonNull(directory);
this.shell = requireNonNull(shell);
this.shell = requireNonNull(shell);
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}

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@Override
public String toString() {
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return account + ':' + password + ':' + uid + ':' + gid + ':' + String.join(",", gecos) + ':' + directory + ':' + shell;
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}

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public static Record parse(String text) {
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String[] tokens = text.split(":");
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return new Record(
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tokens[0],
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tokens[1],
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Integer.parseInt(tokens[2]),
Integer.parseInt(tokens[3]),
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Arrays.asList(tokens[4].split(",")),
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tokens[5],
tokens[6]);
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}
}
}

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public static void main(String[] args) throws IOException {
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@Override
public String toString() {
List<String> rawData = Arrays.asList(
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"jsmith:x:1001:1000:Joe Smith,Room 1007,(234)555-8917,(234)555-0077,[email protected]:/home/jsmith:/bin/bash",
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return account + ':' + password + ':' + uid + ':' + gid + ':' + gecos.stream().collect(joining(",")) + ':' + directory + ':' + shell;
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"jdoe:x:1002:1000:Jane Doe,Room 1004,(234)555-8914,(234)555-0044,[email protected]:/home/jdoe:/bin/bash",
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}
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"xyz:x:1003:1000:X Yz,Room 1003,(234)555-8913,(234)555-0033,[email protected]:/home/xyz:/bin/bash"
);
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public static Record parse(String text) {

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String[] tokens = text.split(":");
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List<Record> records = rawData.stream().map(Record::parse).collect(Collectors.toList());
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return new Record(

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tokens[0],
tokens[1],
Path tmp = Paths.get("_rosetta", ".passwd");
parseInt(tokens[2]),
Files.createDirectories(tmp.getParent());
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Files.write(tmp, (Iterable<String>) records.stream().limit(2).map(Record::toString)::iterator);
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parseInt(tokens[3]),

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asList(tokens[4].split(",")),
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Files.write(tmp, Collections.singletonList(records.get(2).toString()), StandardOpenOption.APPEND);
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tokens[5],

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tokens[6]);
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try (Stream<String> lines = Files.lines(tmp)) {
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}
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lines.map(Record::parse).forEach(System.out::println);
}
}
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public static void main(String[] args) throws IOException {
String[] rawData = {
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"jsmith:x:1001:1000:Joe Smith,Room 1007,(234)555-8917,(234)555-0077,[email protected]:/home/jsmith:/bin/bash",
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"jdoe:x:1002:1000:Jane Doe,Room 1004,(234)555-8914,(234)555-0044,[email protected]:/home/jdoe:/bin/bash",
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"xyz:x:1003:1000:X Yz,Room 1003,(234)555-8913,(234)555-0033,[email protected]:/home/xyz:/bin/bash"
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};
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List<Record> records = stream(rawData).map(Record::parse).collect(toList());
Path tmp = Paths.get("_rosetta", ".passwd");
Files.createDirectories(tmp.getParent());
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Files.write(tmp, (Iterable<String>)records.stream().limit(2).map(Record::toString)::iterator);
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Files.write(tmp, asList(records.get(2).toString()), APPEND);
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try(Stream<String> lines = Files.lines(tmp)) {
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lines.map(Record::parse).forEach(System.out::println);
}
}
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}</lang>
}
}
</lang>
{{out}}
{{out}}
<pre>Appended Record: xyz:x:1003:1000:X Yz,Room 1003,(234)555-8913,(234)555-0033,xyz@rosettacode.org:/home/xyz:/bin/bash</pre>
<pre>Appended Record: xyz:x:1003:1000:X Yz,Room 1003,(234)555-8913,(234)555-0033,xyz@rosettacode.org:/home/xyz:/bin/bash</pre>
Retrieved from "https://rosettacode.org/wiki/Append_a_record_to_the_end_of_a_text_file"