Source Code Cross Referenced for PlainScriptConduit.java in  » Ajax » dwr » org » directwebremoting » dwrp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » dwr » org.directwebremoting.dwrp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2005 Joe Walker
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *     http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:        package org.directwebremoting.dwrp;
17:
18:        import java.io.IOException;
19:
20:        import javax.servlet.http.HttpServletResponse;
21:
22:        import org.directwebremoting.ScriptBuffer;
23:        import org.directwebremoting.extend.ConverterManager;
24:        import org.directwebremoting.extend.MarshallException;
25:        import org.directwebremoting.extend.ScriptBufferUtil;
26:        import org.directwebremoting.util.MimeConstants;
27:
28:        /**
29:         * A ScriptConduit for use with plain Javascript output.
30:         * <p>Scripts are plain Javascript without 'execute-in-parent-context' wrapping,
31:         * but with script-start and script-end markers.
32:         * <p>If this conduit is used the client should direct the output to an iframe
33:         * and then poll, looking for new data into the iframe. The html tags should be
34:         * removed and script between script-start and script-end tags eval()ed.
35:         * <p>This conduit is useful for Firefox. It will not work as it stands with IE
36:         * 6/6 because they don't allow the browser to see data entering an iframe until
37:         * it overflows a 4k buffer. See the {@link Html4kScriptConduit} for a version
38:         * that works around this problem.
39:         * @author Joe Walker [joe at getahead dot ltd dot uk]
40:         */
41:        public class PlainScriptConduit extends BaseScriptConduit {
42:            /**
43:             * Simple ctor
44:             * @param response Used to flush output
45:             * @param batchId The id of the batch that we are responding to
46:             * @param converterManager How we convert objects to script
47:             * @throws IOException If stream actions fail
48:             */
49:            public PlainScriptConduit(HttpServletResponse response,
50:                    String batchId, ConverterManager converterManager,
51:                    boolean jsonOutput) throws IOException {
52:                super (response, batchId, converterManager, jsonOutput);
53:            }
54:
55:            /* (non-Javadoc)
56:             * @see org.directwebremoting.dwrp.BaseScriptConduit#preStreamSetup()
57:             */
58:            @Override
59:            protected String getOutboundMimeType() {
60:                return MimeConstants.MIME_JS;
61:            }
62:
63:            /* (non-Javadoc)
64:             * @see org.directwebremoting.dwrp.BaseScriptConduit#beginStream()
65:             */
66:            @Override
67:            public void beginStream() {
68:            }
69:
70:            /* (non-Javadoc)
71:             * @see org.directwebremoting.dwrp.BaseScriptConduit#endStream()
72:             */
73:            @Override
74:            public void endStream() {
75:            }
76:
77:            /* (non-Javadoc)
78:             * @see org.directwebremoting.ScriptConduit#addScript(org.directwebremoting.ScriptBuffer)
79:             */
80:            @Override
81:            public boolean addScript(ScriptBuffer scriptBuffer)
82:                    throws IOException, MarshallException {
83:                String script = ScriptBufferUtil.createOutput(scriptBuffer,
84:                        converterManager, jsonOutput);
85:
86:                synchronized (out) {
87:                    out.println(ProtocolConstants.SCRIPT_START_MARKER);
88:                    out.println(script);
89:                    out.println(ProtocolConstants.SCRIPT_END_MARKER);
90:
91:                    return flush();
92:                }
93:            }
94:        }
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