com.google.gerrit.httpd.plugins.SmallResource.java Source code

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Here is the source code for com.google.gerrit.httpd.plugins.SmallResource.java

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// 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.plugins;

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;

final class SmallResource extends Resource {
    private final byte[] data;
    private String contentType;
    private String characterEncoding;
    private long lastModified;

    SmallResource(byte[] data) {
        this.data = data;
    }

    SmallResource setLastModified(long when) {
        this.lastModified = when;
        return this;
    }

    SmallResource setContentType(String contentType) {
        this.contentType = contentType;
        return this;
    }

    SmallResource setCharacterEncoding(@Nullable String enc) {
        this.characterEncoding = enc;
        return this;
    }

    @Override
    int weigh() {
        return contentType.length() * 2 + data.length;
    }

    @Override
    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;
            } else {
                res.setDateHeader("Last-Modified", lastModified);
            }
        }
        res.setContentType(contentType);
        if (characterEncoding != null) {
            res.setCharacterEncoding(characterEncoding);
        }
        res.setContentLength(data.length);
        res.getOutputStream().write(data);
    }

    @Override
    boolean isUnchanged(long lastModified) {
        return this.lastModified == lastModified;
    }
}