Java tutorial
/* * Copyright 2000-2018 Vaadin Ltd. * * 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 com.vaadin.server; import java.net.URL; import com.vaadin.util.FileTypeResolver; /** * <code>ExternalResource</code> implements source for resources fetched from * location specified by URL:s. The resources are fetched directly by the client * terminal and are not fetched through the terminal adapter. * * @author Vaadin Ltd. * @since 3.0 */ @SuppressWarnings("serial") public class ExternalResource implements Resource { /** * Url of the download. */ private String sourceURL = null; /** * MIME Type for the resource */ private String mimeType = null; /** * Creates a new download component for downloading directly from given URL. * * @param sourceURL * the source URL. */ public ExternalResource(URL sourceURL) { if (sourceURL == null) { throw new RuntimeException("Source must be non-null"); } this.sourceURL = sourceURL.toString(); } /** * Creates a new download component for downloading directly from given URL. * * @param sourceURL * the source URL. * @param mimeType * the MIME Type */ public ExternalResource(URL sourceURL, String mimeType) { this(sourceURL); this.mimeType = mimeType; } /** * Creates a new download component for downloading directly from given URL. * * @param sourceURL * the source URL. */ public ExternalResource(String sourceURL) { if (sourceURL == null) { throw new RuntimeException("Source must be non-null"); } this.sourceURL = sourceURL; } /** * Creates a new download component for downloading directly from given URL. * * @param sourceURL * the source URL. * @param mimeType * the MIME Type */ public ExternalResource(String sourceURL, String mimeType) { this(sourceURL); this.mimeType = mimeType; } /** * Gets the URL of the external resource. * * @return the URL of the external resource. */ public String getURL() { return sourceURL; } /** * Gets the MIME type of the resource. * * @see com.vaadin.server.Resource#getMIMEType() */ @Override public String getMIMEType() { if (mimeType == null) { mimeType = FileTypeResolver.getMIMEType(getURL()); } return mimeType; } /** * Sets the MIME type of the resource. */ public void setMIMEType(String mimeType) { this.mimeType = mimeType; } }