Mercurial > hg > mpdl-group
view software/eXist/mpdl-modules/src/org/exist/xquery/modules/mpdltext/EncodeBig5.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: TextModule.java $ */ package org.exist.xquery.modules.mpdltext; import java.io.UnsupportedEncodingException; 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.Sequence; import org.exist.xquery.value.SequenceType; import org.exist.xquery.value.StringValue; import org.exist.xquery.value.Type; import org.exist.xquery.value.ValueSequence; public class EncodeBig5 extends BasicFunction { public final static FunctionSignature signature = new FunctionSignature( new QName("encode-big5", MPDLTextModule.NAMESPACE_URI, MPDLTextModule.PREFIX), "A function which delivers an encoded translation of the big5 input string", new SequenceType[] { new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE) }, new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE)); public EncodeBig5(XQueryContext context) { super(context, signature); } public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException { Sequence seqBig5InputStr = args[0]; String big5InputStr = ""; String charset = "big5"; if (seqBig5InputStr.isEmpty()) return Sequence.EMPTY_SEQUENCE; else big5InputStr = seqBig5InputStr.getStringValue(); ValueSequence result = null; String resultStr = ""; try { byte[] resultBytes = big5InputStr.getBytes(charset); for (int i=0; i < resultBytes.length; i++) { byte b = resultBytes[i]; int unsigned = unsignedByteToInt(b); String hexStr = Integer.toHexString(unsigned); resultStr = resultStr + "%" + hexStr; } result = new ValueSequence(); result.add(new StringValue(resultStr)); } catch (UnsupportedEncodingException e) { } return result; } private int unsignedByteToInt(byte b) { return (int) b & 0xFF; } }