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package com.sun.enterprise.universal.collections;
import java.util.*;
/**
* all-static methods for handling operations with Collections
* @author bnevins
*/
public class CollectionUtils {
private CollectionUtils() {
}
/**
* Convert a Properties object, which is a Map<Object,Object> into
* a Map<String,String>
* @param p The Properties object to convert
* @return The converted Map
*/
public static Map<String,String> propertiesToStringMap(Properties p)
{
Map<String,String> map = new HashMap<String,String>();
Set<Object> names = p.keySet();
for(Object name : names) {
if(name == null) // impossible
continue;
Object value = p.get(name);
if(value == null)
map.put(name.toString(), null);
else
map.put(name.toString(), value.toString());
}
return map;
}
/**
* Tired of dumping a String representation of a Map?
* Then call me!
* @param map The map to turn into a printable String
* @return The pretty String
*/
public static String toString(Map<String,String> map) {
String[] arr = toStringArray(map);
StringBuilder sb = new StringBuilder();
for(String s : arr) {
sb.append(s);
sb.append(EOL);
}
return sb.toString();
}
/**
* Convert a String[] into a space-delimited String
* @param arr The String array to convert
* @return The pretty String
*/
public static String toString(String[] arr) {
StringBuilder sb = new StringBuilder();
for(String s : arr) {
sb.append(s);
sb.append(' ');
}
return sb.toString();
}
/**
* Convert a List of String into a space-delimited String
* @param arr The String array to convert
* @return The pretty String
*/
public static String toString(List<String> list) {
StringBuilder sb = new StringBuilder();
for(String s : list) {
sb.append(s);
sb.append(' ');
}
return sb.toString();
}
public static String[] toStringArray(Map<String,String> map) {
Set<String> set = map.keySet();
String[] ss = new String[map.size()];
int i = 0;
for(String name : set) {
String value = map.get(name);
String s = name;
if(value != null) {
s += "=" + value;
}
ss[i++] = s;
}
return ss;
}
private static final String EOL = System.getProperty("line.separator");
}