PlaceholderReplacer.java

package org.cloudfoundry.community.servicebroker.brooklyn.service.plan;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;

public class PlaceholderReplacer {
	
	private Random random;

	public PlaceholderReplacer(Random random){
		this.random = random;
	}
	
	public Map<String, Object> replaceValues(Map<String, Object> map) {
		Map<String, Object> replacements = new HashMap<>(map);
		for(Entry<String, Object> e : map.entrySet()){
			if(e.getValue() instanceof Map){
				replacements.put(e.getKey(), replaceValues((Map<String, Object>)e.getValue()));
			} else if (e.getValue() instanceof String) {
				replacements.put(e.getKey(), replaceValue((String)e.getValue()));
			} else if (e.getValue() instanceof List) {
				replacements.put(e.getKey(), replaceValues((List<Object>)e.getValue()));
			} else {
				replacements.put(e.getKey(), e.getValue());
			}
		}
		return replacements;
	}
	
	public List<Object> replaceValues(List<Object> list) {
		List<Object> replacements = new ArrayList<>();
		for(Object o : list) {
			if(o instanceof Map){
				replacements.add(replaceValues((Map<String, Object>)o));
			} else if (o instanceof String) {
				replacements.add(replaceValue((String)o));
			} else if (o instanceof List) {
				replacements.add(replaceValues((List<Object>)o));
			} else {
				replacements.add(o);
			}
		}
		return replacements;
	}

	public String replaceValue(String value) {
		return value.replace("$(string.random)", randomString(8));
	}
	
	public String randomString(int length){

		char[] chars = "abcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
		StringBuilder sb = new StringBuilder();
		Random random = new Random();
		for (int i = 0; i < length; i++) {
			char c = chars[random.nextInt(chars.length)];
			sb.append(c);
		}
		return sb.toString();
	}

}