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//  ========================================================================
//  Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
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//  You may elect to redistribute this code under either of these licenses.
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package org.eclipse.jetty.http;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.jetty.http.MimeTypes.Type;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.resource.Resource;

HttpContent created from a Resource.

The HttpContent is used to server static content that is not cached. So fields and values are only generated as need be an not kept for reuse

/** * HttpContent created from a {@link Resource}. * <p>The HttpContent is used to server static content that is not * cached. So fields and values are only generated as need be an not * kept for reuse</p> */
public class ResourceHttpContent implements HttpContent { final Resource _resource; final String _contentType; final int _maxBuffer; Map<CompressedContentFormat, HttpContent> _precompressedContents; String _etag; public ResourceHttpContent(final Resource resource, final String contentType) { this(resource, contentType, -1, null); } public ResourceHttpContent(final Resource resource, final String contentType, int maxBuffer) { this(resource, contentType, maxBuffer, null); } public ResourceHttpContent(final Resource resource, final String contentType, int maxBuffer, Map<CompressedContentFormat, HttpContent> precompressedContents) { _resource = resource; _contentType = contentType; _maxBuffer = maxBuffer; if (precompressedContents == null) { _precompressedContents = null; } else { _precompressedContents = new HashMap<>(precompressedContents.size()); for (Map.Entry<CompressedContentFormat, HttpContent> entry : precompressedContents.entrySet()) { _precompressedContents.put(entry.getKey(), new PrecompressedHttpContent(this, entry.getValue(), entry.getKey())); } } } @Override public String getContentTypeValue() { return _contentType; } @Override public HttpField getContentType() { return _contentType == null ? null : new HttpField(HttpHeader.CONTENT_TYPE, _contentType); } @Override public HttpField getContentEncoding() { return null; } @Override public String getContentEncodingValue() { return null; } @Override public String getCharacterEncoding() { return _contentType == null ? null : MimeTypes.getCharsetFromContentType(_contentType); } @Override public Type getMimeType() { return _contentType == null ? null : MimeTypes.CACHE.get(MimeTypes.getContentTypeWithoutCharset(_contentType)); } @Override public HttpField getLastModified() { long lm = _resource.lastModified(); return lm >= 0 ? new HttpField(HttpHeader.LAST_MODIFIED, DateGenerator.formatDate(lm)) : null; } @Override public String getLastModifiedValue() { long lm = _resource.lastModified(); return lm >= 0 ? DateGenerator.formatDate(lm) : null; } @Override public ByteBuffer getDirectBuffer() { if (_resource.length() <= 0 || _maxBuffer > 0 && _maxBuffer < _resource.length()) return null; try { return BufferUtil.toBuffer(_resource, true); } catch (IOException e) { throw new RuntimeException(e); } } @Override public HttpField getETag() { return new HttpField(HttpHeader.ETAG, getETagValue()); } @Override public String getETagValue() { return _resource.getWeakETag(); } @Override public ByteBuffer getIndirectBuffer() { if (_resource.length() <= 0 || _maxBuffer > 0 && _maxBuffer < _resource.length()) return null; try { return BufferUtil.toBuffer(_resource, false); } catch (IOException e) { throw new RuntimeException(e); } } @Override public HttpField getContentLength() { long l = _resource.length(); return l == -1 ? null : new HttpField.LongValueHttpField(HttpHeader.CONTENT_LENGTH, l); } @Override public long getContentLengthValue() { return _resource.length(); } @Override public InputStream getInputStream() throws IOException { return _resource.getInputStream(); } @Override public ReadableByteChannel getReadableByteChannel() throws IOException { return _resource.getReadableByteChannel(); } @Override public Resource getResource() { return _resource; } @Override public void release() { _resource.close(); } @Override public String toString() { return String.format("%s@%x{r=%s,ct=%s,c=%b}", this.getClass().getSimpleName(), hashCode(), _resource, _contentType, _precompressedContents != null); } @Override public Map<CompressedContentFormat, HttpContent> getPrecompressedContents() { return _precompressedContents; } }