PathMatcher.java

package org.theonefx.wcframework.mvc.wcweb;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import org.theonefx.wcframework.utils.StringUtils;

public abstract class PathMatcher implements Comparable<PathMatcher> {
	protected static final Pattern expPattern = Pattern.compile("\\$\\{(.*?)\\}");

	private final String expression;

	protected final String[][] paramterNames;
	
	protected final Pattern[] patterns;

	protected final String[] split;

	protected PathMatcher(String expression) {
		this.expression = expression;
		split = expression.split("/");
		patterns = new Pattern[split.length];
		paramterNames = new String[split.length][];
		List<String> list = new ArrayList<String>();
		for (int i = 0; i < split.length; i++) {
			String s = split[i];
			Matcher matcher = expPattern.matcher(s);
			int found = 0;
			while (matcher.find()) {
				found++;
				String name = matcher.group(1);
				list.add(name);
			}
			if (found > 0) {
				String newExp = matcher.replaceAll("(.*)");
				patterns[i] = Pattern.compile(newExp);
			} else {
				patterns[i] = null;
			}
			paramterNames[i] = list.toArray(new String[list.size()]);
		}
	}

	protected abstract int getLevel();

	public abstract boolean match(String name, HttpServletRequest req);

	@Override
	public int compareTo(PathMatcher o) {
		return getLevel() - o.getLevel();
	}

	protected String getExpression() {
		return expression;
	}

	public boolean sameAs(Object obj) {
		if (obj == null || !(obj instanceof PathMatcher)) {
			return false;
		}
		if (this == obj) {
			return true;
		}
		if (this.getClass() == obj.getClass()) {
			PathMatcher that = (PathMatcher) obj;
			if (StringUtils.equal(expression, that.expression, true)) {
				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}
}