/*
* Load.java
*
* Copyright 2008 Mark Logic Corporation.
* Portions Copyright 2007 Sun Microsystems, Inc.
* All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common
* Development and Distribution License("CDDL") (collectively, the
* "License"). You may not use this file except in compliance with the
* License. You can obtain a copy of the License at
* https://xproc.dev.java.net/public/CDDL+GPL.html or
* docs/CDDL+GPL.txt in the distribution. See the License for the
* specific language governing permissions and limitations under the
* License. When distributing the software, include this License Header
* Notice in each file and include the License file at docs/CDDL+GPL.txt.
*/
package com.xmlcalabash.extensions;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.io.ReadablePipe;
import com.xmlcalabash.io.WritablePipe;
import com.xmlcalabash.library.DefaultStep;
import com.xmlcalabash.runtime.XAtomicStep;
import com.xmlcalabash.util.Base64;
import com.xmlcalabash.util.S9apiUtils;
import net.sf.saxon.s9api.QName;
import net.sf.saxon.s9api.SaxonApiException;
import net.sf.saxon.s9api.XdmNode;
import org.xml.sax.InputSource;
import java.io.ByteArrayInputStream;
/**
*
* @author ndw
*/
public class Uncompress extends DefaultStep {
protected static final String logger = "com.xmlcalabash.extensions.gunzip";
private static final QName _compression_method = new QName("compression-method");
private ReadablePipe source = null;
private WritablePipe result = null;
/**
* Creates a new instance of Load
*/
public Uncompress(XProcRuntime runtime, XAtomicStep step) {
super(runtime,step);
}
public void setInput(String port, ReadablePipe pipe) {
source = pipe;
}
public void setOutput(String port, WritablePipe pipe) {
result = pipe;
}
public void reset() {
source.resetReader();
result.resetWriter();
}
public void run() throws SaxonApiException {
super.run();
String cmethod = getOption(_compression_method, "gzip");
if (!"gzip".equals(cmethod)) {
throw XProcException.stepError(999, "The only compression method supported is 'gzip'.");
}
XdmNode root = S9apiUtils.getDocumentElement(source.read());
byte[] decoded = null;
// N.B. The Base64.decode() method *automatically* expands gzipped data!
if ("base64".equals(root.getAttributeValue(_encoding))) {
decoded = Base64.decode(root.getStringValue());
} else {
throw XProcException.stepError(999, "Input to cx:gunzip must be binary encoded data.");
}
try {
ByteArrayInputStream bais = new ByteArrayInputStream(decoded);
InputSource is = new InputSource(bais);
XdmNode doc = runtime.parse(is);
result.write(doc);
} catch (Exception e) {
throw new XProcException(e);
}
}
}