alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (CustomFilter.java)

This example Java source code file (CustomFilter.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractfilter, bufferedreader, customfilter, inputstreamreader, ioexception, javascripthelper, log, logging, noclassdeffounderror, opencookie, otherwise, override, please, scriptengineabstraction, string, stringbuilder, util

The CustomFilter.java Java example source code

/*
 * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.hotspot.igv.filter;

import com.sun.hotspot.igv.graph.Diagram;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.openide.DialogDisplayer;
import org.openide.NotifyDescriptor;
import org.openide.cookies.OpenCookie;
import org.openide.filesystems.Repository;
import org.openide.filesystems.FileSystem;
import org.openide.filesystems.FileObject;
import org.openide.util.Exceptions;
import org.openide.util.Lookup;

/**
 *
 * @author Thomas Wuerthinger
 */
public class CustomFilter extends AbstractFilter {

    public static final String JAVASCRIPT_HELPER_ID = "JavaScriptHelper";
    private static ScriptEngineAbstraction engine;
    private String code;
    private String name;

    public CustomFilter(String name, String code) {
        this.name = name;
        this.code = code;
        getProperties().setProperty("name", name);
    }

    public String getName() {
        return name;
    }

    public String getCode() {
        return code;
    }

    public void setName(String s) {
        name = s;
        fireChangedEvent();
    }

    public void setCode(String s) {
        code = s;
        fireChangedEvent();
    }

    @Override
    public OpenCookie getEditor() {
        return new OpenCookie() {

            public void open() {
                openInEditor();
            }
        };
    }

    public boolean openInEditor() {
        EditFilterDialog dialog = new EditFilterDialog(CustomFilter.this);
        dialog.setVisible(true);
        return dialog.wasAccepted();
    }

    @Override
    public String toString() {
        return getName();
    }

    public static ScriptEngineAbstraction getEngine() {
        if (engine == null) {

            ScriptEngineAbstraction chosen = null;
            try {
                Collection<? extends ScriptEngineAbstraction> list = Lookup.getDefault().lookupAll(ScriptEngineAbstraction.class);
                for (ScriptEngineAbstraction s : list) {
                    if (s.initialize(getJsHelperText())) {
                        if (chosen == null || !(chosen instanceof JavaSE6ScriptEngine)) {
                            chosen = s;
                        }
                    }
                }
            } catch (NoClassDefFoundError ncdfe) {
                Logger.getLogger("global").log(Level.SEVERE, null, ncdfe);
            }

            if (chosen == null) {
                NotifyDescriptor message = new NotifyDescriptor.Message("Could not find a scripting engine. Please make sure that the Rhino scripting engine is available. Otherwise filter cannot be used.", NotifyDescriptor.ERROR_MESSAGE);
                DialogDisplayer.getDefault().notifyLater(message);
                chosen = new NullScriptEngine();
            }

            engine = chosen;
        }

        return engine;
    }

    private static String getJsHelperText() {
        InputStream is = null;
        StringBuilder sb = new StringBuilder("importPackage(Packages.com.sun.hotspot.igv.filter);importPackage(Packages.com.sun.hotspot.igv.graph);importPackage(Packages.com.sun.hotspot.igv.data);importPackage(Packages.com.sun.hotspot.igv.util);importPackage(java.awt);");
        try {
            FileSystem fs = Repository.getDefault().getDefaultFileSystem();
            FileObject fo = fs.getRoot().getFileObject(JAVASCRIPT_HELPER_ID);
            is = fo.getInputStream();
            BufferedReader r = new BufferedReader(new InputStreamReader(is));
            String s;
            while ((s = r.readLine()) != null) {
                sb.append(s);
                sb.append("\n");
            }

        } catch (IOException ex) {
            Logger.getLogger("global").log(Level.SEVERE, null, ex);
        } finally {
            try {
                is.close();
            } catch (IOException ex) {
                Exceptions.printStackTrace(ex);
            }
        }
        return sb.toString();
    }

    public void apply(Diagram d) {
        getEngine().execute(d, code);
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java CustomFilter.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.