org.jbpm.jpdl.par.ProcessArchive.java Source code

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Here is the source code for org.jbpm.jpdl.par.ProcessArchive.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.jpdl.par;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Element;

import org.jbpm.JbpmConfiguration.Configs;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.jpdl.JpdlException;
import org.jbpm.jpdl.xml.Problem;
import org.jbpm.jpdl.xml.ProblemListener;
import org.jbpm.util.ClassLoaderUtil;
import org.jbpm.util.IoUtil;
import org.jbpm.util.XmlUtil;

public class ProcessArchive implements ProblemListener, Serializable {

    private static final long serialVersionUID = 1L;

    private static final Map parsersByResource = new HashMap();

    // fields ///////////////////////////////////////////////////////////////////

    private String name = "";
    // maps entry-names (String) to byte-arrays (byte[])
    private Map entries = new HashMap();
    private List problems = new ArrayList();

    // constructors /////////////////////////////////////////////////////////////

    public ProcessArchive(ZipInputStream zipInputStream) throws IOException {
        for (ZipEntry zipEntry = zipInputStream.getNextEntry(); zipEntry != null; zipEntry = zipInputStream
                .getNextEntry()) {
            String entryName = zipEntry.getName();
            byte[] bytes = IoUtil.readBytes(zipInputStream);
            entries.put(entryName, bytes);
        }
    }

    // parse the process definition from the contents ///////////////////////////

    public ProcessDefinition parseProcessDefinition() {
        ProcessDefinition processDefinition = ProcessDefinition.createNewProcessDefinition();
        for (Iterator iter = getParsers().iterator(); iter.hasNext();) {
            ProcessArchiveParser processArchiveParser = (ProcessArchiveParser) iter.next();
            processDefinition = processArchiveParser.readFromArchive(this, processDefinition);
        }
        if (Problem.containsProblemsOfLevel(problems, Problem.LEVEL_ERROR)) {
            throw new JpdlException(problems);
        }
        return processDefinition;
    }

    // methods for the process archive parsers //////////////////////////////////

    public String toString() {
        return "process-archive(" + name + ")";
    }

    public Map getEntries() {
        return entries;
    }

    public byte[] getEntry(String entryName) {
        return (byte[]) entries.get(entryName);
    }

    public InputStream getEntryInputStream(String entryName) {
        return new ByteArrayInputStream(getEntry(entryName));
    }

    public byte[] removeEntry(String entryName) {
        return (byte[]) entries.remove(entryName);
    }

    public InputStream removeEntryInputStream(String entryName) {
        return new ByteArrayInputStream(removeEntry(entryName));
    }

    public void addProblem(Problem problem) {
        problems.add(problem);
    }

    public List getProblems() {
        return problems;
    }

    public void resetProblems() {
        problems = new ArrayList();
    }

    private static List getParsers() {
        String resource = Configs.getString("resource.parsers");
        synchronized (parsersByResource) {
            List parsers = (List) parsersByResource.get(resource);
            if (parsers == null) {
                parsers = createParsers(resource);
                parsersByResource.put(resource, parsers);
            }
            return parsers;
        }
    }

    private static List createParsers(String resource) {
        // read parsers resource
        InputStream resourceStream = ClassLoaderUtil.getStream(resource);
        Element parsersElement = XmlUtil.parseXmlInputStream(resourceStream).getDocumentElement();
        List parsers = new ArrayList();

        Log log = LogFactory.getLog(ProcessArchive.class);
        boolean debug = log.isDebugEnabled();

        for (Iterator iter = XmlUtil.elementIterator(parsersElement, "parser"); iter.hasNext();) {
            Element parserElement = (Element) iter.next();
            String parserClassName = parserElement.getAttribute("class");
            // load parser class
            try {
                Class parserClass = ClassLoaderUtil.classForName(parserClassName);
                // instantiate parser
                try {
                    ProcessArchiveParser parser = (ProcessArchiveParser) parserClass.newInstance();
                    if (parser instanceof ConfigurableParser) {
                        ((ConfigurableParser) parser).configure(parserElement);
                    }
                    parsers.add(parser);
                    if (debug)
                        log.debug("loaded " + parserClass);
                } catch (InstantiationException e) {
                    if (debug)
                        log.debug("failed to instantiate " + parserClass, e);
                } catch (IllegalAccessException e) {
                    if (debug)
                        log.debug(ProcessArchive.class + " has no access to " + parserClass, e);
                }
            } catch (ClassNotFoundException e) {
                if (debug)
                    log.debug("parser not found: " + parserClassName, e);
            }
        }
        return parsers;
    }
}