Mercurial > hg > mpdl-group
view 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> |
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date | Wed, 24 Nov 2010 17:24:23 +0100 |
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/* * eXist Open Source Native XML Database: Extension module * Copyright (C) 2008 Josef Willenborg * jwillenborg@mpiwg-berlin.mpg.de * http://www.mpiwg-berlin.mpg.de * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * $Id: $ */ package org.exist.xquery.modules.mpdldoc; import java.io.IOException; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.params.HttpClientParams; import org.apache.commons.httpclient.params.HttpMethodParams; import org.exist.dom.QName; import org.exist.xquery.BasicFunction; import org.exist.xquery.Cardinality; import org.exist.xquery.FunctionSignature; import org.exist.xquery.XPathException; import org.exist.xquery.XQueryContext; import org.exist.xquery.value.BooleanValue; import org.exist.xquery.value.NumericValue; import org.exist.xquery.value.Sequence; import org.exist.xquery.value.SequenceType; import org.exist.xquery.value.Type; /** * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de) */ public class CheckUri extends BasicFunction { public final static FunctionSignature signature = new FunctionSignature( new QName("check-uri", MPDLDocModule.NAMESPACE_URI, MPDLDocModule.PREFIX), "A function which checks the uri-string if it is available within a timeout value (in ms).", new SequenceType[] { new SequenceType(Type.STRING, Cardinality.ZERO_OR_ONE), new SequenceType(Type.INTEGER, Cardinality.ZERO_OR_ONE) }, new SequenceType(Type.BOOLEAN, Cardinality.EXACTLY_ONE)); public CheckUri(XQueryContext context) { super(context, signature); } public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException { Sequence isOk = BooleanValue.TRUE; HttpClient httpClient = new HttpClient(); GetMethod method = null; try { Sequence firstSeq = args[0]; Sequence secondSeq = args[1]; if (firstSeq.isEmpty()) return isOk; String uriStr = firstSeq.getStringValue(); int milliseconds = 2000; // default value if (! secondSeq.isEmpty()) { NumericValue value = (NumericValue) secondSeq.convertTo(Type.NUMBER); milliseconds = value.getInt(); } httpClient.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(milliseconds)); httpClient.getParams().setParameter(HttpClientParams.CONNECTION_MANAGER_TIMEOUT, new Long(milliseconds)); method = new GetMethod(uriStr); method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(milliseconds)); method.setFollowRedirects(true); httpClient.executeMethod(method); } catch (IOException e) { isOk = BooleanValue.FALSE; // if timeout exception is thrown } finally { if (method != null) { method.releaseConnection(); } } return isOk; } }