Ensure commons-language-server is independent from java/maven projects

vscode-extensions/commons/commons-java/src/main/java/org/springframework/ide/vscode/commons/languageserver/java/DefaultJavaProjectFinder.java

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+package org.springframework.ide.vscode.commons.languageserver.java;
+
+import org.springframework.ide.vscode.commons.java.IJavaProject;
+import org.springframework.ide.vscode.commons.util.IDocument;
+import org.springframework.ide.vscode.commons.util.Log;
+
+public class DefaultJavaProjectFinder implements JavaProjectFinder {
+
+	private final IJavaProjectFinderStrategy[] strategies;
+	
+	public DefaultJavaProjectFinder(IJavaProjectFinderStrategy[] strategies) {
+		this.strategies = strategies;
+	}
+
+	@Override
+	public IJavaProject find(IDocument d) {
+		for (IJavaProjectFinderStrategy strategy : strategies) {
+			try {
+				IJavaProject project = strategy.find(d);
+				if (project != null) {
+					return project;
+				}
+			} catch (Exception e) {
+				Log.log(e);
+			}
+		}
+		return null;
+	}
+	
+}

vscode-extensions/commons/commons-java/src/main/java/org/springframework/ide/vscode/commons/languageserver/java/IJavaProjectFinderStrategy.java

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+/*******************************************************************************
+ * Copyright (c) 2016 Pivotal, Inc.
+ * 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
+ *
+ * Contributors:
+ *     Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.commons.languageserver.java;
+
+import org.springframework.ide.vscode.commons.java.IJavaProject;
+import org.springframework.ide.vscode.commons.util.IDocument;
+
+/**
+ * Strategy foe finding Java project for a document
+ *
+ * @author Alex Boyko
+ *
+ */
+@FunctionalInterface
+public interface IJavaProjectFinderStrategy {
+
+	IJavaProject find(IDocument document) throws Exception;
+
+}

vscode-extensions/commons/commons-java/src/main/java/org/springframework/ide/vscode/commons/languageserver/java/JavaProjectFinder.java

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+package org.springframework.ide.vscode.commons.languageserver.java;
+
+import org.springframework.ide.vscode.commons.java.IJavaProject;
+import org.springframework.ide.vscode.commons.util.IDocument;
+
+@FunctionalInterface
+public interface JavaProjectFinder {
+	IJavaProject find(IDocument doc);
+}