org.apache.juneau.rest.vars.SerializedRequestAttrVar Maven / Gradle / Ivy

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package org.apache.juneau.rest.vars;

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

import java.io.*;

import org.apache.juneau.http.response.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.serializer.*;
import org.apache.juneau.svl.*;

/**
 * Serialized request attribute variable resolver.
 *
 * 
 * The format for this var is "$SA{contentType,key[,defaultValue]}".
 *
 * 

 * This variable resolver requires that a {@link RestRequest} bean be available in the session bean store.
 *
 * 

 * 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.
 *
 * 
See Also:

 * 	SVL Variables
 * 
 */
public class SerializedRequestAttrVar extends StreamedVar {

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

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

	@Override /* Var */
	public void resolveTo(VarResolverSession session, Writer w, String key) throws Exception {
		int i = key.indexOf(',');
		if (i == -1)
			throw new IllegalArgumentException("Invalid format for $SA var. Must be of the format $SA{contentType,key[,defaultValue]}");
		String[] s2 = split(key);
		RestRequest req = session.getBean(RestRequest.class).orElseThrow(InternalServerError::new);
		Object o = req.getAttribute(key).orElse(key);
		Serializer s = req.getOpContext().getSerializers().getSerializer(s2[0]);
		if (s != null)
			s.serialize(w, o);
	}

	@Override  /* Var */
	protected boolean allowNested() {
		return false;
	}

	@Override  /* Var */
	protected boolean allowRecurse() {
		return false;
	}

	@Override /* Var */
	public boolean canResolve(VarResolverSession session) {
		return session.getBean(RestRequest.class).isPresent();
	}
}