Dissolve gerrit-httpd top-level directory

Change-Id: I287b29b893c6f561dbbf6fa04dc714b4b7f48d54

java/com/google/gerrit/httpd/resources/Resource.java

@@ -0,0 +1,56 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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.google.gerrit.httpd.resources;
+
+import com.google.gwtexpui.server.CacheHeaders;
+import java.io.IOException;
+import java.io.Serializable;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public abstract class Resource implements Serializable {
+  private static final long serialVersionUID = 1L;
+
+  public static final Resource NOT_FOUND =
+      new Resource() {
+        private static final long serialVersionUID = 1L;
+
+        @Override
+        public int weigh() {
+          return 0;
+        }
+
+        @Override
+        public void send(HttpServletRequest req, HttpServletResponse res) throws IOException {
+          CacheHeaders.setNotCacheable(res);
+          res.sendError(HttpServletResponse.SC_NOT_FOUND);
+        }
+
+        @Override
+        public boolean isUnchanged(long latestModifiedDate) {
+          return false;
+        }
+
+        protected Object readResolve() {
+          return NOT_FOUND;
+        }
+      };
+
+  public abstract boolean isUnchanged(long latestModifiedDate);
+
+  public abstract int weigh();
+
+  public abstract void send(HttpServletRequest req, HttpServletResponse res) throws IOException;
+}

java/com/google/gerrit/httpd/resources/ResourceKey.java

@@ -0,0 +1,19 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// 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.google.gerrit.httpd.resources;
+
+public interface ResourceKey {
+  int weigh();
+}

java/com/google/gerrit/httpd/resources/ResourceWeigher.java

@@ -0,0 +1,24 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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.google.gerrit.httpd.resources;
+
+import com.google.common.cache.Weigher;
+
+public class ResourceWeigher implements Weigher<ResourceKey, Resource> {
+  @Override
+  public int weigh(ResourceKey key, Resource value) {
+    return key.weigh() + value.weigh();
+  }
+}

java/com/google/gerrit/httpd/resources/SmallResource.java

@@ -0,0 +1,76 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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.google.gerrit.httpd.resources;
+
+import com.google.common.net.HttpHeaders;
+import com.google.gerrit.common.Nullable;
+import java.io.IOException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public final class SmallResource extends Resource {
+  private static final long serialVersionUID = 1L;
+  private final byte[] data;
+  private String contentType;
+  private String characterEncoding;
+  private long lastModified;
+
+  public SmallResource(byte[] data) {
+    this.data = data;
+  }
+
+  public SmallResource setLastModified(long when) {
+    this.lastModified = when;
+    return this;
+  }
+
+  public SmallResource setContentType(String contentType) {
+    this.contentType = contentType;
+    return this;
+  }
+
+  public SmallResource setCharacterEncoding(@Nullable String enc) {
+    this.characterEncoding = enc;
+    return this;
+  }
+
+  @Override
+  public int weigh() {
+    return contentType.length() * 2 + data.length;
+  }
+
+  @Override
+  public void send(HttpServletRequest req, HttpServletResponse res) throws IOException {
+    if (0 < lastModified) {
+      long ifModifiedSince = req.getDateHeader(HttpHeaders.IF_MODIFIED_SINCE);
+      if (ifModifiedSince > 0 && ifModifiedSince == lastModified) {
+        res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
+        return;
+      }
+      res.setDateHeader("Last-Modified", lastModified);
+    }
+    res.setContentType(contentType);
+    if (characterEncoding != null) {
+      res.setCharacterEncoding(characterEncoding);
+    }
+    res.setContentLength(data.length);
+    res.getOutputStream().write(data);
+  }
+
+  @Override
+  public boolean isUnchanged(long lastModified) {
+    return this.lastModified == lastModified;
+  }
+}