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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.rest.arg;

import java.security.*;

import javax.servlet.*;
import javax.servlet.http.*;

import org.apache.juneau.reflect.*;
import org.apache.juneau.rest.annotation.*;
import org.apache.juneau.utils.*;

/**
 * Resolves method parameters on {@link RestOp}-annotated Java methods of types found on the {@link HttpServletRequest} object.
 *
 * <ul class='javatree'>
 * 	<li class='jc'>{@link AsyncContext}
 * 	<li class='jc'><c>{@link Cookie}[]</c>
 * 	<li class='jc'>{@link DispatcherType}
 * 	<li class='jc'>{@link HttpServletRequest}
 * 	<li class='jc'>{@link Principal}
 * </ul>
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jrs.JavaMethodParameters}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public class HttpServletRequestArgs extends SimpleRestOperationArg {

	/**
	 * Static creator.
	 *
	 * @param paramInfo The Java method parameter being resolved.
	 * @return A new arg, or <jk>null</jk> if the parameter type is not one of the supported types.
	 */
	public static HttpServletRequestArgs create(ParamInfo paramInfo) {
		if (paramInfo.isType(AsyncContext.class))
			return new HttpServletRequestArgs(x->x.getAsyncContext());
		if (paramInfo.isType(CookieList.class))
			return new HttpServletRequestArgs(x->CookieList.of(x.getCookies()));
		if (paramInfo.isType(DispatcherType.class))
			return new HttpServletRequestArgs(x->x.getDispatcherType());
		if (paramInfo.isType(HttpServletRequest.class))
			return new HttpServletRequestArgs(x->x);
		if (paramInfo.isType(Principal.class))
			return new HttpServletRequestArgs(x->x.getUserPrincipal());
		return null;
	}

	/**
	 * Constructor.
	 *
	 * @param <T> The function return type.
	 * @param function The function for finding the arg.
	 */
	protected <T> HttpServletRequestArgs(ThrowingFunction<HttpServletRequest,T> function) {
		super((session)->function.apply(session.getRequest().getHttpServletRequest()));
	}
}
