package com.michaelthomas.map;

/**
 * @author Michael Thomas (www.michael-thomas.com) michael@michael-thomas.com
 * 
 */

import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class MyMapTraverse {
	//NOTE: For learning, you must see the JUnit test file in the /test/ directory and matching package!

	//Ex: Using entrySet() & For Each
	public String forEachExampleEntrySet(Map<String, String> map) {
		//Note: Map is not designed to be traversed. Use lookups.  Use this for debugging purpose.
		Set<Map.Entry<String, String>> entries = map.entrySet();
		StringBuilder sb = new StringBuilder();
		int counter = 0;
		for (Map.Entry<String, String> entry : entries) {
			Object key = entry.getKey();    
			Object value = entry.getValue();   
			sb.append(key + " = " + value + (counter != entries.size()-1 ? ", " : ""));
			counter++;
		}
		return sb.toString();
	}

	//Ex: Using keySet() & For Each
	public String forEachExampleKeySet(Map<String, String> map) {
		//Note: Map is not designed to be traversed. Use lookups.  Use this for debugging purpose.
		StringBuilder sb = new StringBuilder();
		int counter = 0;
		for (Object key : map.keySet()) {
			Object value = map.get(key);   
			sb.append(key + " = " + value + (counter != map.size()-1 ? ", " : ""));
			counter++;
		}
		return sb.toString();
	}
	
	//Ex: Using entrySet() & Iterator
	public String iterateForLoopExampleEntrySet(Map<String, String> map) {
		//Note: Map is not designed to be traversed. Use lookups.  Use this for debugging purpose.
		Set<Map.Entry<String, String>> entries = map.entrySet();
		StringBuilder sb = new StringBuilder();
		for (Iterator<Map.Entry<String, String>> iterator = entries.iterator(); iterator.hasNext();) {
			Map.Entry<String, String> entry = iterator.next();
			Object key = entry.getKey();    
			Object value = entry.getValue();   
			sb.append(key + " = " + value + (iterator.hasNext() ? ", " : ""));
		}
		return sb.toString();

	}

	//Ex: Using keySet() & Iterator
	public String iterateForLoopExampleKeySet(Map<String, String> map) {
		//Note: Map is not designed to be traversed. Use lookups.  Use this for debugging purpose.
		StringBuilder sb = new StringBuilder();
		for (Iterator<String> iterator = map.keySet().iterator(); iterator.hasNext();) {
			Object key = iterator.next();
			Object value = map.get(key);
			sb.append(key + " = " + value + (iterator.hasNext() ? ", " : ""));
		}
		return sb.toString();
		
	}

}