org.jboss.errai.ui.shared.ServerTemplateProvider.java Source code

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Here is the source code for org.jboss.errai.ui.shared.ServerTemplateProvider.java

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/*
 * Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.jboss.errai.ui.shared;

import javax.enterprise.context.ApplicationScoped;

import org.jboss.errai.ui.client.local.spi.TemplateProvider;
import org.jboss.errai.ui.client.local.spi.TemplateRenderingCallback;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;

/**
 * Retrieves templates from the server using the provided template location as URL.
 * 
 * @author Christian Sadilek <csadilek@redhat.com>
 */
@ApplicationScoped
public class ServerTemplateProvider implements TemplateProvider {

    @Override
    public void provideTemplate(final String url, final TemplateRenderingCallback renderingCallback) {
        final RequestBuilder request = new RequestBuilder(RequestBuilder.GET, url);
        request.setCallback(new RequestCallback() {
            @Override
            public void onResponseReceived(Request request, Response response) {
                if (response.getStatusCode() == Response.SC_OK) {
                    renderingCallback.renderTemplate(response.getText());
                } else {
                    throw new RuntimeException("Failed to retrieve template from server at " + url
                            + " (status code: " + response.getStatusCode() + ")");
                }
            }

            @Override
            public void onError(Request request, Throwable exception) {
                throw new RuntimeException("Failed to retrieve template from server at " + url, exception);
            }
        });

        try {
            request.send();
        } catch (RequestException e) {
            throw new RuntimeException("Failed to retrieve template from server at" + request.getUrl(), e);
        }
    }
}