UrlBuilder.java

package moe.feng.bilinyan.util;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;

public class UrlBuilder {

	String urlRoot;
	ArrayList<HashMap<String, String>> params;

	public UrlBuilder(String urlRoot) {
		this.urlRoot = urlRoot;
		this.params = new ArrayList<>();
	}

	public UrlBuilder addParams(String key, String value) {
		HashMap<String, String> map = new HashMap<>();
		map.put("key", key);
		map.put("value", value);
		this.params.add(map);
		return this;
	}

	public UrlBuilder addParams(String key, int value) {
		HashMap<String, String> map = new HashMap<>();
		map.put("key", key);
		map.put("value", Integer.toString(value));
		this.params.add(map);
		return this;
	}

	public UrlBuilder removeParams(String key) {
		for (HashMap<String, String> map : params) {
			if (map.get("key").equals(key)) {
				params.remove(map);
				return this;
			}
		}
		return this;
	}

	public int paramsSize() {
		return params.size();
	}

	public HashMap<String, String> getParmas(int index) {
		return params.get(index);
	}

	public String toString() {
		StringBuffer sb = new StringBuffer(urlRoot);
		for (int i = 0; i < params.size(); i++) {
			try {
				sb.append(i == 0 ? "?" : "&")
						.append(params.get(i).get("key"))
						.append("=")
						.append(URLEncoder.encode(params.get(i).get("value"), "UTF-8"));
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

	public String toStringWithoutUrlRoot() {
		StringBuffer sb = new StringBuffer("");
		sortParams();
		for (int i = 0; i < params.size(); i++) {
			try {
				sb.append(i == 0 ? "" : "&")
						.append(params.get(i).get("key"))
						.append("=")
						.append(URLEncoder.encode(params.get(i).get("value"), "UTF-8"));
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

	private void sortParams() {
		for (int i = 0; i < paramsSize() - 1; i++) {
			for (int j = i + 1; j < paramsSize(); j++) {
				if (params.get(i).get("key").compareTo(params.get(j).get("key")) > 0) {
					HashMap<String, String> tempMap = params.get(i);
					params.set(i, params.get(j));
					params.set(j, tempMap);
				}
			}
		}
	}

}