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package bjc.utils.ioutils;
import java.io.InputStream;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.Set;
/**
* Simple file based properties.
*
* @author EVE
*
*/
public class SimpleProperties implements Map<String, String> {
private Map<String, String> props;
/**
* Create a new set of simple properties.
*/
public SimpleProperties() {
props = new HashMap<>();
}
/**
* Load properties from the provided input stream.
*
* The format is the name, a space, then the body.
*
* All leading/trailing spaces from the name & body are removed.
*
* @param is
* The stream to read from.
*
* @param allowDuplicates
* Whether or not duplicate keys should be allowed.
*/
public void loadFrom(InputStream is, boolean allowDuplicates) {
try(Scanner scn = new Scanner(is)) {
while(scn.hasNextLine()) {
String ln = scn.nextLine().trim();
/*
* Skip blank lines/comments
*/
if(ln.equals("")) continue;
if(ln.startsWith("#")) continue;
int sepIdx = ln.indexOf(' ');
if(sepIdx == -1) {
String fmt = "Properties must be a name, a space, then the body.\n\tOffending line is '%s'";
String msg = String.format(fmt, ln);
throw new NoSuchElementException(msg);
}
String name = ln.substring(0, sepIdx).trim();
String body = ln.substring(sepIdx).trim();
if(!allowDuplicates && containsKey(name)) {
String msg = String.format("Duplicate key '%s'", name);
throw new IllegalStateException(msg);
}
put(name, body);
}
}
}
/**
* Output the set of read properties.
*/
public void outputProperties() {
System.out.println("Read properties:");
for(Entry<String, String> entry : entrySet()) {
System.out.printf("\t'%s'\t'%s'\n", entry.getKey(), entry.getValue());
}
System.out.println();
}
@Override
public int size() {
return props.size();
}
@Override
public boolean isEmpty() {
return props.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return props.containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return props.containsValue(value);
}
@Override
public String get(Object key) {
return props.get(key);
}
@Override
public String put(String key, String value) {
return props.put(key, value);
}
@Override
public String remove(Object key) {
return props.remove(key);
}
@Override
public void putAll(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(Object o) {
return props.equals(o);
}
@Override
public int hashCode() {
return props.hashCode();
}
}
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