com.google.gerrit.httpd.resources.Resource 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.gerrit.util.http.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;
}