ProjectResourceDependencyProvider.java

/*  Copyright (C) 2009 Mobile Sorcery AB

    This program is free software; you can redistribute it and/or modify it
    under the terms of the Eclipse Public License v1.0.

    This program 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 Eclipse Public License v1.0 for
    more details.

    You should have received a copy of the Eclipse Public License v1.0 along
    with this program. It is also available at http://www.eclipse.org/legal/epl-v10.html
*/
package com.mobilesorcery.sdk.internal.dependencies;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;

import com.mobilesorcery.sdk.core.IBuildVariant;
import com.mobilesorcery.sdk.core.MoSyncBuilder;
import com.mobilesorcery.sdk.internal.builder.MoSyncBuilderVisitor;

/**
 * <p>A dependency provider for resource files (*.lst) in
 * mosync projects -- touching those files should trigger
 * a change in maheaders.h</p>
 * <p>
 * <b>Exception:</b> The STABS file generated by pipe tool
 * </p>
 * @author Mattias Bybro, mattias.bybro@purplescout.se
 *
 */
public class ProjectResourceDependencyProvider implements IDependencyProvider<IResource> {

	public final static String RESOURCE_EXT = "lst";

	public final static String RESOURCE_XML_EXT = "lstx";

	public final static String STABS_FILE_NAME = "stabs.lst";

	public final static IPath MA_HEADER_PATH = new Path("MAHeaders.h");

	private final static Map<IResource, Collection<IResource>> EMPTY_MAP = Collections.unmodifiableMap(new HashMap<IResource, Collection<IResource>>());

    private final IBuildVariant variant;

    private final IProject project;

	public ProjectResourceDependencyProvider(IProject project, IBuildVariant variant) {
	    this.project = project;
        this.variant = variant;
    }

    @Override
	public Map<IResource, Collection<IResource>> computeDependenciesOf(IResource resource)
			throws CoreException {
		if (isResourceFile(resource) && !STABS_FILE_NAME.equalsIgnoreCase(resource.getName())) {
		    IPath maHeaderPath = MoSyncBuilder.getOutputPath(project, variant).append(MA_HEADER_PATH);
		    IFile[] maHeaderMatchedFiles = ResourcesPlugin.getWorkspace().getRoot().findFilesForLocationURI(maHeaderPath.toFile().toURI());
			HashMap<IResource, Collection<IResource>> result = new HashMap<IResource, Collection<IResource>>();
			ArrayList<IResource> resourceList = new ArrayList<IResource>();
			resourceList.add(resource);
			for (IFile maHeaderFile : maHeaderMatchedFiles) {
			    result.put(maHeaderFile, resourceList);
			}
			return result;
		}
		return EMPTY_MAP;
	}

	private boolean isResourceFile(IResource resource) {
		return MoSyncBuilderVisitor.hasExtension(resource, MoSyncBuilderVisitor.RESOURCE_FILE_EXTS);
	}

}