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package bjc.utils.ioutils;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.Reader;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;
/**
* Simple file based properties.
*
* @author EVE
*
*/
public class SimpleProperties implements Map<String, String> {
/**
* Exception thrown when there is a duplicate key, when they are forbidden.
*
* @author 15405
*
*/
public static class DuplicateKeys extends RuntimeException {
private static final long serialVersionUID = -5521190136366024804L;
/**
* Create a new duplicate key exception.
*
* @param keyName
* The name of the key that has been duplicated.
*/
public DuplicateKeys(String keyName) {
super(String.format("Duplicate value encountered for key '%s'", keyName));
}
}
public static class InvalidLineFormat extends RuntimeException {
private static final long serialVersionUID = 5332131472090792841L;
public InvalidLineFormat(String lne) {
super(String.format("Line '%s' is improperly formatted.\n\tExpected format is a string key, followed by a single space, followed by the value", ""));
}
}
private final Map<String, String> props;
/**
* Create a new set of simple properties.
*/
public SimpleProperties() {
props = new HashMap<>();
}
/**
* Load properties from an input stream.
*
* Delegates to {@link SimpleProperties#loadFrom(Reader, boolean)} to allow
* you to pass a input stream instead of a reader.
*
* @param is
* The stream to read from.
* @param allowDuplicates
* Whether or not duplicate keys should be allowed.
*/
public void loadFrom(final InputStream is, final boolean allowDuplicates) {
loadFrom(new InputStreamReader(is), allowDuplicates);
}
/**
* Load properties from the provided input reader.
*
* The format is the name, a space, then the body.
*
* All leading/trailing spaces from the name & body are removed.
*
* @param rdr
* The reader to read from.
*
* @param allowDuplicates
* Whether or not duplicate keys should be allowed. If they are,
* the end-value of the property will be what the last one was.
*
* @throws DuplicateKeys If duplicate keys have been found when they are prohibited.
*/
public void loadFrom(final Reader rdr, final boolean allowDuplicates) {
try(Scanner scn = new Scanner(rdr)) {
while(scn.hasNextLine()) {
final String ln = scn.nextLine().trim();
/*
* Skip blank lines/comments
*/
if(ln.equals("") || ln.startsWith("#")) {
continue;
}
final int sepIdx = ln.indexOf(' ');
/*
* Complain about improperly formatted lines.
*/
if(sepIdx == -1) {
throw new InvalidLineFormat(ln);
}
final String name = ln.substring(0, sepIdx).trim();
final String body = ln.substring(sepIdx).trim();
/*
* Complain about duplicates, if that is wanted.
*/
if(!allowDuplicates && containsKey(name)) {
throw new DuplicateKeys(name);
}
put(name, body);
}
}
}
/**
* Output the set of read properties.
*
* Uses System.out, since one isn't specified.
*/
public void outputProperties() {
outputProperties(System.out);
}
/**
* Output the set of read properties.
*
* @param strim The stream to output properties to.
*/
public void outputProperties(PrintStream strim) {
strim.println("Read properties:");
for(final Entry<String, String> entry : entrySet()) {
strim.printf("\t'%s'\t'%s'\n", entry.getKey(), entry.getValue());
}
strim.println();
}
@Override
public int size() {
return props.size();
}
@Override
public boolean isEmpty() {
return props.isEmpty();
}
@SuppressWarnings("unlikely-arg-type")
@Override
public boolean containsKey(final Object key) {
return props.containsKey(key);
}
@SuppressWarnings("unlikely-arg-type")
@Override
public boolean containsValue(final Object value) {
return props.containsValue(value);
}
@SuppressWarnings("unlikely-arg-type")
@Override
public String get(final Object key) {
return props.get(key);
}
@Override
public String put(final String key, final String value) {
return props.put(key, value);
}
@SuppressWarnings("unlikely-arg-type")
@Override
public String remove(final Object key) {
return props.remove(key);
}
@Override
public void putAll(final Map<? extends String, ? extends String> m) {
props.putAll(m);
}
@Override
public void clear() {
props.clear();
}
@Override
public Set<String> keySet() {
return props.keySet();
}
@Override
public Collection<String> values() {
return props.values();
}
@Override
public Set<java.util.Map.Entry<String, String>> entrySet() {
return props.entrySet();
}
@Override
public boolean equals(final Object o) {
return props.equals(o);
}
@Override
public int hashCode() {
return props.hashCode();
}
}
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