Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2014 Edgar Espina * * 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.jooby; import static java.util.Objects.requireNonNull; import java.io.InputStream; import java.net.URL; import com.google.common.io.BaseEncoding; import com.google.common.primitives.Longs; import javax.annotation.Nonnull; /** * Usually a public file/resource like javascript, css, images files, etc... * An asset consist of content type, stream and last modified since attributes, between others. * * @author edgar * @since 0.1.0 * @see Jooby#assets(String) */ public interface Asset { /** * Forwarding asset. * * @author edgar */ public class Forwarding implements Asset { private Asset asset; public Forwarding(final Asset asset) { this.asset = requireNonNull(asset, "Asset is required."); } @Override public String etag() { return asset.etag(); } @Override public String name() { return asset.name(); } @Override public String path() { return asset.path(); } @Override public URL resource() { return asset.resource(); } @Override public long length() { return asset.length(); } @Override public long lastModified() { return asset.lastModified(); } @Override public InputStream stream() throws Exception { return asset.stream(); } @Override public MediaType type() { return asset.type(); } } /** * Examples: * * <pre> * GET /assets/index.js {@literal ->} index.js * GET /assets/js/index.js {@literal ->} index.js * </pre> * * @return The asset name (without path). */ @Nonnull default String name() { String path = path(); int slash = path.lastIndexOf('/'); return path.substring(slash + 1); } /** * Examples: * * <pre> * GET /assets/index.js {@literal ->} /assets/index.js * GET /assets/js/index.js {@literal ->} /assets/js/index.js * </pre> * * @return The asset requested path, includes the name. */ @Nonnull String path(); /** * @return URL representing the resource. */ @Nonnull URL resource(); /** * @return Generate a weak Etag using the {@link #path()}, {@link #lastModified()} and * {@link #length()}. */ @Nonnull default String etag() { StringBuilder b = new StringBuilder(32); b.append("W/\""); BaseEncoding b64 = BaseEncoding.base64(); int lhash = resource().hashCode(); b.append(b64.encode(Longs.toByteArray(lastModified() ^ lhash))); b.append(b64.encode(Longs.toByteArray(length() ^ lhash))); b.append('"'); return b.toString(); } /** * @return Asset size (in bytes) or <code>-1</code> if undefined. */ long length(); /** * @return The last modified date if possible or -1 when isn't. */ long lastModified(); /** * @return The content of this asset. * @throws Exception If content can't be read it. */ @Nonnull InputStream stream() throws Exception; /** * @return Asset media type. */ @Nonnull MediaType type(); }