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+/*
+ * 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();
+ }
+}