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package org.apache.juneau.rest.matcher;

import static org.apache.juneau.internal.StringUtils.*;
import static org.apache.juneau.rest.annotation.RestOpAnnotation.*;

import javax.servlet.http.*;

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

/**
 * Specialized matcher for matching client versions.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jrs.ClientVersioning}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public class ClientVersionMatcher extends RestMatcher {

	private final String clientVersionHeader;
	private final VersionRange range;

	/**
	 * Constructor.
	 *
	 * @param clientVersionHeader
	 * 	The HTTP request header name containing the client version.
	 * 	If <jk>null</jk> or an empty string, uses <js>"Client-Version"</js>
	 * @param mi The version string that the client version must match.
	 */
	public ClientVersionMatcher(String clientVersionHeader, MethodInfo mi) {
		this.clientVersionHeader = isEmpty(clientVersionHeader) ? "Client-Version" : clientVersionHeader;
		Value<String> clientVersion = Value.empty();
		mi.getAnnotationList(REST_OP_GROUP).forEachValue(String.class, "clientVersion", NOT_EMPTY, x -> clientVersion.set(x));
		range = new VersionRange(clientVersion.orElse(null));
	}

	@Override /* RestMatcher */
	public boolean matches(HttpServletRequest req) {
		return range.matches(req.getHeader(clientVersionHeader));
	}

	@Override /* RestMatcher */
	public boolean required() {
		return true;
	}
}
