<change id="LazyActionRegistration">

        <api name="DebuggerCoreAPI"/>

        <summary>A declarative mechanism that creates action provider instance after a file with specific MIME type becomes active.</summary>

        <version major="1" minor="24"/>

        <date day="11" month="2" year="2010"/>

        <author login="mentlicher"/>

        <compatibility binary="compatible" source="compatible" addition="yes"/>

        <description>

             <p>

             ActionsProvider.Registration annotation is enhanced with two additional

             methods getActions() and enabledOnMIMETypes(). Until a file with the

             listed MIME type is selected in the IDE, the appropriate actions provider

             is left disabled for the given list of actions, without instantiating the

             implementation class.

             </p>

        </description>

        <class package="org.netbeans.spi.debugger" name="ActionsProvider" />

        <issue number="177561"/>

    </change>

    public static final String SERVICE_ACTIONS = "debugger_actions"; // NOI18N

    public static final String SERVICE_ENABLED_MIMETYPES = "debugger_enabledOnMIMETypes"; // NOI18N

import org.openide.filesystems.annotations.LayerBuilder.File;

        handleProviderRegistrationInner(e, providerClass, path, null, null);

    }

    private void handleProviderRegistrationInner(Element e, Class providerClass, String path,

                                                 String[] actions, String[] enabledOnMIMETypes

                                                 ) throws IllegalArgumentException, LayerGenerationException {

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.lang.reflect.InvocationTargetException;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.HashSet;

import java.util.List;

        /**

         * Provide the list of actions that this provider supports.

         * This list is used before an instance of the registered class is created,

         * it's necessary when {@link #enabledOnMIMETypes()} is overriden

         * to prevent from the class instantiation.

         * @return The list of actions.

         * @since 1.23

         */

        String[] getActions() default {};

        /**

         * Provide the list of MIME types that are compared to the MIME type of

         * a file currently active in the IDE and when matched, this provider

         * is activated (an instance of the registered class is created).

         * This method is used to delay the instatiation of the implementation

         * class for performance reasons.

         * @return The list of MIME types

         * @since 1.23

         */

        String[] enabledOnMIMETypes() default {};

        private static final String ERROR = "error in getting MIMEType";    // NOI18N

            this.actions = actions;

            this.enabledOnMIMETypes = enabledOnMIMETypes;

            this.actions = actions;

            this.enabledOnMIMETypes = enabledOnMIMETypes;

                for (ActionsProviderListener l : listeners) {

                    delegate.addActionsProviderListener(l);

                }

                listeners.clear();

                if (contextDispatcherListener != null) {

                    detachContextDispatcherListener();

                }

            ActionsProvider actionsDelegate;

            if (enabledOnMIMETypes != null) {

                synchronized (this) {

                    actionsDelegate = this.delegate;

                }

            } else {

                actionsDelegate = getDelegate();

            }

            if (actionsDelegate == null) {

                String currentMIMEType = getCurrentMIMEType();

                if (currentMIMEType != ERROR) {

                    if (!enabledOnMIMETypes.contains(currentMIMEType)) {

                        return false;

                    }

                }

            }

    }

    /** Used by unit test only */

    void setMostRecentFile(FileObject file) {

        Object oldFile;

        String MIMEType = null;

        synchronized (this) {

            oldFile = mostRecentFileRef.get();

            mostRecentFileRef = new WeakReference(file);

            if (file != null) {

                MIMEType = file.getMIMEType();

            }

        }

        refreshProcessor.post(new EventFirer(PROP_EDITOR, oldFile, file, MIMEType));

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Date;

import java.util.Enumeration;

import org.netbeans.api.debugger.providers.TestMIMETypeSensitiveActionProvider;

import org.netbeans.spi.debugger.ActionsProviderListener;

import org.netbeans.spi.debugger.ui.EditorContextDispatcherManager;

import org.openide.filesystems.FileChangeListener;

import org.openide.filesystems.FileLock;

import org.openide.filesystems.FileObject;

import org.openide.filesystems.FileStateInvalidException;

import org.openide.filesystems.FileSystem;

import org.openide.filesystems.LocalFileSystem;

    public void testMIMETypeSensitiveActionProviders() throws Exception {

        Lookup.MetaInf l = new Lookup.MetaInf("unittest_MIME");

        List<? extends ActionsProvider> list = l.lookup(null, ActionsProvider.class);

        assertEquals("No test action provider instance should be created yet!", 0, TestMIMETypeSensitiveActionProvider.INSTANCES.size());

        assertInstanceOf("Wrong looked up object", list.get(0), ActionsProvider.class);

        ActionsProvider ap = list.get(0);

        Object action = ap.getActions().iterator().next();

        assertEquals(TestMIMETypeSensitiveActionProvider.ACTION_OBJECT, action);

        assertEquals("No test action provider instance should be created yet!", 0, TestMIMETypeSensitiveActionProvider.INSTANCES.size());

        ap.isEnabled(action);

        assertEquals("No test action provider instance should be created yet!", 0, TestMIMETypeSensitiveActionProvider.INSTANCES.size());

        final Boolean[] actionStateChanged = new Boolean[] { null };

        ap.addActionsProviderListener(new ActionsProviderListener() {

            @Override

            public void actionStateChange(Object action, boolean enabled) {

                actionStateChanged[0] = enabled;

            }

        });

        assertEquals("No test action provider instance should be created yet!", 0, TestMIMETypeSensitiveActionProvider.INSTANCES.size());

        /*

        LocalFileSystem fs = new LocalFileSystem();

        fs.setRootDirectory(new File("/tmp"));

        Repository.getDefault().addFileSystem(fs);

         */

        FileObject f = createCFile();

        EditorContextDispatcherManager.setMostRecentFile(f);

        Thread.sleep(500);

        assertEquals("No test action provider instance should be created yet!", 0, TestMIMETypeSensitiveActionProvider.INSTANCES.size());

        f = createJavaFile();

        EditorContextDispatcherManager.setMostRecentFile(f);

        Thread.sleep(500);

        assertEquals("One test action provider instance should be created!", 1, TestMIMETypeSensitiveActionProvider.INSTANCES.size());

    }

    private static FileObject createCFile() throws IOException {

        /* Creates FileObject with unknown content type without full IDE

        File file = File.createTempFile("Foo", ".c");

        FileWriter fw = new FileWriter(file);

        fw.append("#include <stdio.h>\n\nmain() {\n  printf(\"Hi there!\");\n}\n");

        fw.flush();

        fw.close();

        fs.refresh(true);

        return FileUtil.toFileObject(file);

         */

        return new FileObjectWithMIMEType("text/x-c");

    }

    private static FileObject createJavaFile() throws IOException {

        /* Creates FileObject with unknown content type without full IDE

        File file = File.createTempFile("Foo", ".java");

        FileWriter fw = new FileWriter(file);

        fw.append("\nmain(String[] args) {\n  System.out.println(\"Hi there!\");\n}\n");

        fw.flush();

        fw.close();

        fs.refresh(true);

        return FileUtil.toFileObject(file);

         */

        return new FileObjectWithMIMEType("text/x-java");

    }

    /** Test FileObject implementation that provides a given MIME type */

    private static class FileObjectWithMIMEType extends FileObject {

        private String MIMEType;

        public FileObjectWithMIMEType(String MIMEType) {

            this.MIMEType = MIMEType;

        }

        @Override

        public String getMIMEType() {

            return MIMEType;

        }

        @Override

        public String getName() {

            return "Test Name";

        }

        @Override

        public String getExt() {

            return "Test ext.";

        }

        @Override

        public void rename(FileLock lock, String name, String ext) throws IOException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public FileSystem getFileSystem() throws FileStateInvalidException {

            return new LocalFileSystem();

        }

        @Override

        public FileObject getParent() {

            return null;

        }

        @Override

        public boolean isFolder() {

            return false;

        }

        @Override

        public Date lastModified() {

            return new Date();

        }

        @Override

        public boolean isRoot() {

            return false;

        }

        @Override

        public boolean isData() {

            return true;

        }

        @Override

        public boolean isValid() {

            return true;

        }

        @Override

        public void delete(FileLock lock) throws IOException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public Object getAttribute(String attrName) {

            return null;

        }

        @Override

        public void setAttribute(String attrName, Object value) throws IOException {

        }

        @Override

        public Enumeration<String> getAttributes() {

            return null;

        }

        @Override

        public void addFileChangeListener(FileChangeListener fcl) {

        }

        @Override

        public void removeFileChangeListener(FileChangeListener fcl) {

        }

        @Override

        public long getSize() {

            return 1000;

        }

        @Override

        public InputStream getInputStream() throws FileNotFoundException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public OutputStream getOutputStream(FileLock lock) throws IOException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public FileLock lock() throws IOException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public void setImportant(boolean b) {

        }

        @Override

        public FileObject[] getChildren() {

            return new FileObject[] {};

        }

        @Override

        public FileObject getFileObject(String name, String ext) {

            return null;

        }

        @Override

        public FileObject createFolder(String name) throws IOException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public FileObject createData(String name, String ext) throws IOException {

            throw new UnsupportedOperationException("Not supported.");

        }

        @Override

        public boolean isReadOnly() {

            return true;

        }

    }

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2009 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

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. 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

 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 *

 * Contributor(s):

 *

 * Portions Copyrighted 2009 Sun Microsystems, Inc.

 */

package org.netbeans.api.debugger.providers;

import java.util.Collections;

import java.util.HashSet;

import java.util.Set;

import org.netbeans.spi.debugger.ActionsProvider;

import org.netbeans.spi.debugger.ActionsProviderListener;

/**

 *

 * @author Martin Entlicher

 */

@ActionsProvider.Registration(path="unittest_MIME", getActions={"MIMETypeSensitiveAction"}, enabledOnMIMETypes={ "text/x-java" })

public class TestMIMETypeSensitiveActionProvider extends ActionsProvider {

    public static Object ACTION_OBJECT = "MIMETypeSensitiveAction";

    public static Set<TestMIMETypeSensitiveActionProvider> INSTANCES = new HashSet<TestMIMETypeSensitiveActionProvider>();

    public TestMIMETypeSensitiveActionProvider() {

        INSTANCES.add(this);

    }

    @Override

    public Set getActions() {

        return Collections.singleton(ACTION_OBJECT);

    }

    @Override

    public void doAction(Object action) {

        throw new UnsupportedOperationException("Not supported yet.");

    }

    @Override

    public boolean isEnabled(Object action) {

        return true;

    }

    @Override

    public void addActionsProviderListener(ActionsProviderListener l) {

    }

    @Override

    public void removeActionsProviderListener(ActionsProviderListener l) {

    }

}

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2010 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

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. 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

 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 *

 * Contributor(s):

 *

 * Portions Copyrighted 2010 Sun Microsystems, Inc.

 */

package org.netbeans.spi.debugger.ui;

import org.openide.filesystems.FileObject;

/**

 * Manages the state of EditorContextDispatcher.

 * @author martin

 */

public class EditorContextDispatcherManager {

    public static void setMostRecentFile(FileObject file) {

        EditorContextDispatcher.getDefault().setMostRecentFile(file);

    }

}