de.micromata.tpsb.doc.renderer.RendererClassUtils.java Source code

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Here is the source code for de.micromata.tpsb.doc.renderer.RendererClassUtils.java

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//
// Copyright (C) 2010-2016 Micromata GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

package de.micromata.tpsb.doc.renderer;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;

import de.micromata.genome.util.runtime.LocalSettings;
import de.micromata.tpsb.project.TpsbProjectCatalog;

/**
 * Utils to load class to render.
 * 
 * @author Roger Kommer (roger.kommer.extern@micromata.de)
 * 
 */
public class RendererClassUtils {
    private static final Logger log = Logger.getLogger(RendererClassUtils.class);

    static ClassLoader rendererClassLoader = null;

    public static ClassLoader createClassLoaderFromPath(List<String> pathes) {
        List<URL> urls = new ArrayList<URL>();

        try {
            for (String path : pathes) {
                File f = new File(path);
                if (f.exists() == false) {
                    log.error("tpsbrendercp class path doesn't exist: " + path + " in " + f.getAbsolutePath());
                    continue;
                }
                URL url = new File(path).toURI().toURL();
                urls.add(url);
            }
            URLClassLoader cl = new URLClassLoader(urls.toArray(new URL[] {}),
                    RendererClassUtils.class.getClassLoader(), null) {
                @Override
                public Class<?> loadClass(String name) throws ClassNotFoundException {
                    try {
                        return super.loadClass(name);
                    } catch (ClassNotFoundException ex) {
                        throw ex;
                    }
                }
            };
            return cl;
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    private static void initProjectClassPaths(List<String> cplist) {
        TpsbProjectCatalog catalog = TpsbProjectCatalog.getInstance();
        List<String> cps = catalog.getProjectCps();
        cplist.addAll(cps);
    }

    private static void addRencerCps(List<String> cps) {
        String tpsbcp = LocalSettings.get().get("genome.tpsb.rendercp");
        if (StringUtils.isBlank(tpsbcp) == true) {
            return;
        }
        String[] pathes = StringUtils.split(tpsbcp, ',');
        for (String path : pathes) {
            cps.add(StringUtils.trim(path));
        }

    }

    private static void addRenderprojectsCps(List<String> cps) {
        String tpsbcp = LocalSettings.get().get("genome.tpsb.renderprojectscp");
        if (StringUtils.isBlank(tpsbcp) == true) {
            return;
        }
        String[] pathes = StringUtils.split(tpsbcp, ',');
        for (String path : pathes) {
            String spath = StringUtils.trim(path);
            File dir = new File(spath);
            File td = new File(dir, "target/test-classes");
            if (td.exists() == true) {
                cps.add(td.getAbsolutePath());
            }
            td = new File(dir, "target/classes");
            if (td.exists() == true) {
                cps.add(td.getAbsolutePath());
            }
        }

    }

    public static ClassLoader getRendererClassLoader() {
        if (rendererClassLoader != null) {
            return rendererClassLoader;
        }
        List<String> cps = new ArrayList<String>();
        addRencerCps(cps);
        addRenderprojectsCps(cps);
        initProjectClassPaths(cps);
        StringBuilder sb = new StringBuilder();
        sb.append("Inited Render ClassLoader:");
        for (String scl : cps) {
            sb.append(" ").append(scl).append("\n");
        }
        log.info(sb.toString());
        rendererClassLoader = createClassLoaderFromPath(cps);

        return rendererClassLoader;
    }

    public static <T> T loadClass(String name, Class<T> expected) {
        try {
            return (T) getRendererClassLoader().loadClass(name).newInstance();
        } catch (ClassNotFoundException ex) {
            throw new RuntimeException("Cannot load class: " + name + "; " + ex.getMessage(), ex);
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        } catch (NoClassDefFoundError ex) {
            throw ex;
        }
    }

}