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package org.glassfish.jersey.internal.inject;

import java.util.Date;
import java.util.List;

import javax.ws.rs.core.EntityTag;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.core.Variant;

import org.glassfish.jersey.internal.LocalizationMessages;

/**
 * Proxiable wrapper for request scoped {@link Request} instance.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
public class RequestInjectee implements Request {

    private Request wrapped;

    /**
     * Set wrapped instance. Should be invoked on each incoming request,
     * when a new injectee instance is created by HK2.
     *
     * @param request actual request instance.
     */
    public void set(final Request request) {
        if (wrapped != null) {
            throw new IllegalStateException(LocalizationMessages.REQUEST_WAS_ALREADY_SET());
        }
        wrapped = request;
    }

    @Override
    public String getMethod() {
        checkState();
        return wrapped.getMethod();
    }

    @Override
    public Variant selectVariant(List<Variant> variants) throws IllegalArgumentException {
        checkState();
        return wrapped.selectVariant(variants);
    }

    @Override
    public ResponseBuilder evaluatePreconditions(EntityTag eTag) {
        checkState();
        return wrapped.evaluatePreconditions(eTag);
    }

    @Override
    public ResponseBuilder evaluatePreconditions(Date lastModified) {
        checkState();
        return wrapped.evaluatePreconditions(lastModified);
    }

    @Override
    public ResponseBuilder evaluatePreconditions(Date lastModified, EntityTag eTag) {
        checkState();
        return wrapped.evaluatePreconditions(lastModified, eTag);
    }

    @Override
    public ResponseBuilder evaluatePreconditions() {
        checkState();
        return wrapped.evaluatePreconditions();
    }

    private void checkState() {
        if (wrapped == null) {
            throw new IllegalStateException(LocalizationMessages.REQUEST_WAS_NOT_SET());
        }
    }

}
