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comparison software/eXist/mpdl-modules/src/org/exist/xquery/modules/mpdldoc/CheckUri.java @ 0:408254cf2f1d

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author Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
date Wed, 24 Nov 2010 17:24:23 +0100
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1 /*
2 * eXist Open Source Native XML Database: Extension module
3 * Copyright (C) 2008 Josef Willenborg
4 * jwillenborg@mpiwg-berlin.mpg.de
5 * http://www.mpiwg-berlin.mpg.de
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 * $Id: $
22 */
23 package org.exist.xquery.modules.mpdldoc;
24
25 import java.io.IOException;
26 import org.apache.commons.httpclient.HttpClient;
27 import org.apache.commons.httpclient.methods.GetMethod;
28 import org.apache.commons.httpclient.params.HttpClientParams;
29 import org.apache.commons.httpclient.params.HttpMethodParams;
30 import org.exist.dom.QName;
31 import org.exist.xquery.BasicFunction;
32 import org.exist.xquery.Cardinality;
33 import org.exist.xquery.FunctionSignature;
34 import org.exist.xquery.XPathException;
35 import org.exist.xquery.XQueryContext;
36 import org.exist.xquery.value.BooleanValue;
37 import org.exist.xquery.value.NumericValue;
38 import org.exist.xquery.value.Sequence;
39 import org.exist.xquery.value.SequenceType;
40 import org.exist.xquery.value.Type;
41
42 /**
43 * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de)
44 */
45 public class CheckUri extends BasicFunction {
46
47 public final static FunctionSignature signature =
48 new FunctionSignature(
49 new QName("check-uri", MPDLDocModule.NAMESPACE_URI, MPDLDocModule.PREFIX),
50 "A function which checks the uri-string if it is available within a timeout value (in ms).",
51 new SequenceType[] {
52 new SequenceType(Type.STRING, Cardinality.ZERO_OR_ONE),
53 new SequenceType(Type.INTEGER, Cardinality.ZERO_OR_ONE)
54 },
55 new SequenceType(Type.BOOLEAN, Cardinality.EXACTLY_ONE));
56
57 public CheckUri(XQueryContext context) {
58 super(context, signature);
59 }
60
61 public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
62 Sequence isOk = BooleanValue.TRUE;
63 HttpClient httpClient = new HttpClient();
64 GetMethod method = null;
65 try {
66 Sequence firstSeq = args[0];
67 Sequence secondSeq = args[1];
68 if (firstSeq.isEmpty())
69 return isOk;
70 String uriStr = firstSeq.getStringValue();
71 int milliseconds = 2000; // default value
72 if (! secondSeq.isEmpty()) {
73 NumericValue value = (NumericValue) secondSeq.convertTo(Type.NUMBER);
74 milliseconds = value.getInt();
75 }
76 httpClient.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(milliseconds));
77 httpClient.getParams().setParameter(HttpClientParams.CONNECTION_MANAGER_TIMEOUT, new Long(milliseconds));
78 method = new GetMethod(uriStr);
79 method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(milliseconds));
80 method.setFollowRedirects(true);
81 httpClient.executeMethod(method);
82 } catch (IOException e) {
83 isOk = BooleanValue.FALSE; // if timeout exception is thrown
84 } finally {
85 if (method != null) {
86 method.releaseConnection();
87 }
88 }
89 return isOk;
90 }
91 }