cc.alcina.framework.gwt.client.ide.provider.ContentProvider.java Source code

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Here is the source code for cc.alcina.framework.gwt.client.ide.provider.ContentProvider.java

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/* 
 * 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 cc.alcina.framework.gwt.client.ide.provider;

import com.google.gwt.user.client.ui.HTML;

import cc.alcina.framework.common.client.WrappedRuntimeException;
import cc.alcina.framework.common.client.WrappedRuntimeException.SuggestedAction;

/**
 * 
 * @author Nick Reddel
 */
public class ContentProvider {
    private static ContentProviderSource provider;

    public static String getContent(String key) {
        if (provider != null) {
            return provider.getContent(key);
        }
        throw new WrappedRuntimeException("No content provider registered", SuggestedAction.NOTIFY_ERROR);
    }

    public static ContentProviderSource getProvider() {
        if (provider != null) {
            return provider;
        }
        throw new WrappedRuntimeException("No content provider registered", SuggestedAction.NOTIFY_ERROR);
    }

    public static HTML getWidget(String key) {
        return getWidget(key, null);
    }

    public static HTML getWidget(String key, String styleClassName) {
        if (provider != null) {
            if (provider instanceof AsyncContentProvider) {
                return ((AsyncContentProvider) provider).getWidget(key, styleClassName);
            } else {
                String content = provider.getContent(key);
                content = content == null ? "[" + key + "]" : content;
                HTML html = new HTML(content);
                if (styleClassName != null) {
                    html.setStyleName(styleClassName);
                }
                return html;
            }
        }
        throw new WrappedRuntimeException("No content provider registered", SuggestedAction.NOTIFY_ERROR);
    }

    public static boolean hasContent(String key) {
        if (provider != null) {
            String trim = getContent(key).trim();
            return !trim.isEmpty() && !trim.startsWith("No content for key");
        }
        throw new WrappedRuntimeException("No content provider registered", SuggestedAction.NOTIFY_ERROR);
    }

    public static void registerProvider(ContentProviderSource p) {
        provider = p;
    }

    public interface ContentProviderSource {
        public String getContent(String key);

        public void refresh();
    }
}