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package org.apache.juneau.svl.vars;

import org.apache.juneau.svl.*;

/**
 * Upper-case variable resolver.
 *
 * <p>
 * The format for this var is <js>"$NE{stringValue}"</js>.
 *
 * <p>
 * This variable returns <js>"true"</js> if the contents are not empty.
 *
 * <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 NotEmptyVar extends SimpleVar {

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

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

	@Override /* Parameter */
	public String resolve(VarResolverSession session, String key) {
		return String.valueOf(! key.trim().isEmpty());
	}
}