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package org.apache.juneau.rest.vars;

import static org.apache.juneau.internal.StringUtils.*;

import org.apache.juneau.internal.*;
import org.apache.juneau.svl.*;

/**
 * URL-encoding variable resolver.
 *
 * <p>
 * The format for this var is <js>"$UE{uriPart}"</js>.
 *
 * <p>
 * This variable takes the contents inside the variable and replaces it with a value returned by calling
 * {@link StringUtils#urlEncode(String)}).
 *
 * <p>
 * Since this is a {@link SimpleVar}, any variables contained in the result will be recursively resolved.
 * Likewise, if the arguments contain any variables, those will be resolved before they are passed to this var.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc juneau-rest-server.SvlVariables}
 * </ul>
 */
public class UrlEncodeVar extends SimpleVar {

	/** The name of this variable. */
	public static final String NAME = "UE";

	/**
	 * Constructor.
	 */
	public UrlEncodeVar() {
		super(NAME);
	}

	@Override /* Var */
	public String resolve(VarResolverSession session, String key) {
		return urlEncode(key);
	}
}