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package org.apache.juneau.rest.arg;

import org.apache.juneau.parser.*;
import org.apache.juneau.reflect.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.rest.annotation.*;
import org.apache.juneau.rest.httppart.*;

/**
 * Resolves method parameters of type {@link Parser} on {@link RestOp}-annotated Java methods.
 *
 * <p>
 * The parameter value is resolved using:
 * <p class='bjava'>
 * 	<jv>opSession</jv>
 * 		.{@link RestOpSession#getRequest() getRequest}()
 * 		.{@link RestRequest#getContent() getContent}()
 * 		.{@link RequestContent#getParserMatch() getParserMatch}()
 * 		.{@link ParserMatch#getParser() getParser}();
 * </p>
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jrs.JavaMethodParameters}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public class ParserArg extends SimpleRestOperationArg {

	/**
	 * Static creator.
	 *
	 * @param paramInfo The Java method parameter being resolved.
	 * @return A new {@link ParserArg}, or <jk>null</jk> if the parameter type is not {@link Parser}.
	 */
	public static ParserArg create(ParamInfo paramInfo) {
		if (paramInfo.isType(Parser.class))
			return new ParserArg();
		return null;
	}

	/**
	 * Constructor.
	 */
	protected ParserArg() {
		super((opSession)->opSession.getRequest().getContent().getParserMatch().map(ParserMatch::getParser).orElse(null));
	}
}
