libhover/org.eclipse.linuxtools.cdt.libhover.devhelp/src/org/eclipse/linuxtools/internal/cdt/libhover/devhelp/DevHelpToc.java

/*******************************************************************************
 * Copyright (c) 2012, 2018 Red Hat Inc. and others.
 * 
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 * Red Hat Inc. - Initial implementation
 *******************************************************************************/
package org.eclipse.linuxtools.internal.cdt.libhover.devhelp;

import java.util.ArrayList;
import java.util.Arrays;

import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.filesystem.IFileSystem;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.help.IToc;
import org.eclipse.help.ITopic;
import org.eclipse.help.IUAElement;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.linuxtools.internal.cdt.libhover.devhelp.preferences.PreferenceConstants;

public class DevHelpToc implements IToc {

    @Override
    public String getLabel() {
        return "Devhelp Documents"; //$NON-NLS-1$
    }

    @Override
    public String getHref() {
        return null;
    }

    @Override
    public boolean isEnabled(IEvaluationContext context) {
        return true;
    }

    @Override
    public IUAElement[] getChildren() {
        return getTopics();
    }

    @Override
    public ITopic[] getTopics() {
        try {
            ArrayList<ITopic> topics = new ArrayList<>();
            IPreferenceStore ps = DevHelpPlugin.getDefault()
                    .getPreferenceStore();
            IPath devhelpLocation = new Path(
                    ps.getString(PreferenceConstants.DEVHELP_DIRECTORY));
            IFileSystem fs = EFS.getLocalFileSystem();
            IFileStore htmlDir = fs.getStore(devhelpLocation);
            IFileStore[] files = htmlDir.childStores(EFS.NONE, null);
            Arrays.sort(files, (arg0, arg1) -> (arg0.getName().compareToIgnoreCase(arg1.getName())));
            for (IFileStore file: files) {
                String name = file.fetchInfo().getName();
                if (fs.getStore(
                        devhelpLocation.append(name).append(name + ".devhelp2")) //$NON-NLS-1$
                        .fetchInfo().exists()) {
                    ITopic topic = new DevHelpTopic(name);
                    topics.add(topic);
                }
            }
            ITopic[] retval = new ITopic[topics.size()];
            return topics.toArray(retval);
        } catch (CoreException e) {
        }
        return null;
    }

    @Override
    public ITopic getTopic(String href) {
        // TODO Auto-generated method stub
        return null;
    }

}