com.google.gerrit.httpd.resources.SmallResource Maven / Gradle / Ivy
// 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;
}
}