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Diffstat (limited to 'simple/simple-http/src/main/java/org/simpleframework/http/socket/DataFrame.java')
-rw-r--r-- | simple/simple-http/src/main/java/org/simpleframework/http/socket/DataFrame.java | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/simple/simple-http/src/main/java/org/simpleframework/http/socket/DataFrame.java b/simple/simple-http/src/main/java/org/simpleframework/http/socket/DataFrame.java new file mode 100644 index 0000000..b51cd2b --- /dev/null +++ b/simple/simple-http/src/main/java/org/simpleframework/http/socket/DataFrame.java @@ -0,0 +1,212 @@ +/* + * DataFrame.java February 2014 + * + * Copyright (C) 2014, Niall Gallagher <niallg@users.sf.net> + * + * 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 org.simpleframework.http.socket; + +/** + * The <code>DataFrame</code> object represents a frame as defined in + * RFC 6455. A frame is a very lightweight envelope used to send + * control information and either text or binary user data. Typically + * a frame will represent a single message however, it is possible + * to fragment a single frame up in to several frames. A fragmented + * frame has a specific <code>FrameType</code> indicating that it + * is a continuation frame. + * + * @author Niall Gallagher + * + * @see org.simpleframework.http.socket.Data + */ +public class DataFrame implements Frame { + + /** + * This is the type used to determine the intent of the frame. + */ + private final FrameType type; + + /** + * This contains the payload to be sent with the frame. + */ + private final Data data; + + /** + * This determines if the frame is the last of a sequence. + */ + private final boolean last; + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. A + * zero payload is created using this constructor and is suitable + * only for specific control frames such as connection termination. + * + * @param type this is the frame type used for this instance + */ + public DataFrame(FrameType type) { + this(type, new byte[0]); + } + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. In + * some cases a control frame may require a zero length payload. + * + * @param type this is the frame type used for this instance + * @param data this is the payload for this frame + */ + public DataFrame(FrameType type, byte[] data) { + this(type, data, true); + } + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. In + * some cases a control frame may require a zero length payload. + * + * @param type this is the frame type used for this instance + * @param data this is the payload for this frame + * @param last true if this is not a fragment in a sequence + */ + public DataFrame(FrameType type, byte[] data, boolean last) { + this(type, new BinaryData(data), last); + } + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. In + * some cases a control frame may require a zero length payload. + * + * @param type this is the frame type used for this instance + * @param data this is the payload for this frame + */ + public DataFrame(FrameType type, String text) { + this(type, text, true); + } + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. In + * some cases a control frame may require a zero length payload. + * + * @param type this is the frame type used for this instance + * @param data this is the payload for this frame + * @param last true if this is not a fragment in a sequence + */ + public DataFrame(FrameType type, String text, boolean last) { + this(type, new TextData(text), last); + } + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. In + * some cases a control frame may require a zero length payload. + * + * @param type this is the frame type used for this instance + * @param data this is the payload for this frame + */ + public DataFrame(FrameType type, Data data) { + this(type, data, true); + } + + /** + * Constructor for the <code>DataFrame</code> object. This is used + * to create a frame using the specified data and frame type. In + * some cases a control frame may require a zero length payload. + * + * @param type this is the frame type used for this instance + * @param data this is the payload for this frame + * @param last true if this is not a fragment in a sequence + */ + public DataFrame(FrameType type, Data data, boolean last) { + this.data = data; + this.type = type; + this.last = last; + } + + /** + * This is used to determine if the frame is the final frame in + * a sequence of fragments or a whole frame. If this returns false + * then the frame is a continuation from from a sequence of + * fragments, otherwise it is a whole frame or the last fragment. + * + * @return this returns false if the frame is a fragment + */ + public boolean isFinal() { + return last; + } + + /** + * This returns the binary payload that is to be sent with the frame. + * It contains no headers or other meta data. If the original data + * was text this converts it to UTF-8. + * + * @return the binary payload to be sent with the frame + */ + public byte[] getBinary() { + return data.getBinary(); + } + + /** + * This returns the text payload that is to be sent with the frame. + * It contains no header information or meta data. Caution should + * be used with this method as binary payloads will encode to + * garbage when decoded as UTF-8. + * + * @return the text payload to be sent with the frame + */ + public String getText(){ + return data.getText(); + } + + /** + * This method is used to convert from one frame type to another. + * Converting a frame type is useful in scenarios such as when a + * ping needs to respond to a pong or when it is more convenient + * to send a text frame as binary. + * + * @param type this is the frame type to convert to + * + * @return a new frame using the specified frame type + */ + public Frame getFrame(FrameType type) { + return new DataFrame(type, data, last); + } + + /** + * This is used to determine the type of frame. Interpretation of + * this type is outlined in RFC 6455 and can be loosely categorised + * as control frames and either data or binary frames. + * + * @return this returns the type of frame that this represents + */ + public FrameType getType(){ + return type; + } + + /** + * This returns the text payload that is to be sent with the frame. + * It contains no header information or meta data. Caution should + * be used with this method as binary payloads will encode to + * garbage when decoded as UTF-8. + * + * @return the text payload to be sent with the frame + */ + @Override + public String toString() { + return getText(); + } +} |