org.eclipse.xtend.ide.builder.JavaProjectPreferencesInitializer.java Source code

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Here is the source code for org.eclipse.xtend.ide.builder.JavaProjectPreferencesInitializer.java

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/*******************************************************************************
 * Copyright (c) 2012 itemis AG (http://www.itemis.eu) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *******************************************************************************/
package org.eclipse.xtend.ide.builder;

import java.util.Set;

import org.apache.log4j.Logger;
import org.eclipse.core.runtime.preferences.DefaultScope;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IScopeContext;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.xtext.resource.FileExtensionProvider;
import org.osgi.service.prefs.BackingStoreException;

import com.google.common.base.Joiner;
import com.google.common.collect.Sets;
import com.google.inject.Inject;

/**
 * 
 * This class is eagerly created by the injector and serves just to initialize the default preferences.
 * TODO use {@link org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer} and its extension point instead
 * 
 * 
 * @author Moritz Eysholdt - Initial contribution and API
 */
public class JavaProjectPreferencesInitializer {

    private static Logger log = Logger.getLogger(JavaProjectPreferencesInitializer.class);

    @SuppressWarnings("restriction")
    @Inject
    public void addOwnFileExtensionsToJavaBuildResourceCopyFilter(FileExtensionProvider extensionProvider) {
        @SuppressWarnings("deprecation")
        IScopeContext defaultScope = new DefaultScope();

        // The class org.eclipse.jdt.internal.launching.LaunchingPreferenceInitializer has this very nasty habit 
        // of replacing all RESOURCE_COPY_FILTERs with its own filter. Calling getNode(LaunchingPlugin.ID_PLUGIN) 
        // causes LaunchingPreferenceInitializer to be executed that afterwards we can append our filters safely.    
        // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=395366
        defaultScope.getNode(org.eclipse.jdt.internal.launching.LaunchingPlugin.ID_PLUGIN);

        IEclipsePreferences dnode = defaultScope.getNode(JavaCore.PLUGIN_ID);
        if (dnode == null)
            return;
        Set<String> filters = Sets.newLinkedHashSet();
        for (String filter : dnode.get(JavaCore.CORE_JAVA_BUILD_RESOURCE_COPY_FILTER, "").split(",")) {
            String trimmed = filter.trim();
            if (!"".equals(trimmed))
                filters.add(trimmed);
        }
        for (String ext : extensionProvider.getFileExtensions())
            filters.add("*." + ext);
        dnode.put(JavaCore.CORE_JAVA_BUILD_RESOURCE_COPY_FILTER, Joiner.on(", ").join(filters));
        try {
            dnode.flush();
        } catch (BackingStoreException e) {
            log.error("Error saving preferences", e);
        }
    }

}