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Contains the entire NEBA core implementation, i.e. the framework that interprets the NEBA API annotations and provides implementations for the service and lifecycle callback interfaces provided in the NEBA API. This package must not export anything as its implementation details are entirely private.

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/**
 * Copyright 2013 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 the "License";
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
**/

package io.neba.core.mvc;

import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.view.InternalResourceView;

import java.util.Locale;

/**
 * Supports "redirect:" and "forward:" {@link View} resolution from view name.
 *
 * @author Olaf Otto
 */
public class NebaViewResolver implements ViewResolver {
    public static final String REDIRECT_URL_PREFIX = "redirect:";
    public static final String FORWARD_URL_PREFIX = "forward:";

    /**
     * Resolves a {@link View} from the provided view name.
     *
     * @param viewName must not be null.
     */
    @Override
    public View resolveViewName(String viewName, Locale locale) throws Exception {
        if (viewName == null) {
            throw new IllegalArgumentException("Method argument viewName must not be null.");
        }

        if (viewName.startsWith(REDIRECT_URL_PREFIX)) {
            String redirectUrl = viewName.substring(REDIRECT_URL_PREFIX.length());
            return new SlingRedirectView(redirectUrl, true, true);
        }
        if (viewName.startsWith(FORWARD_URL_PREFIX)) {
            String forwardUrl = viewName.substring(FORWARD_URL_PREFIX.length());
            return new InternalResourceView(forwardUrl);
        }
        return null;
    }
}