Add utility to check java project settings (#264)

Signed-off-by: Jinbo Wang <[email protected]>

Author: testforstephen

com.microsoft.java.debug.plugin/plugin.xml

@@ -12,6 +12,7 @@
             <command id="vscode.java.validateLaunchConfig"/>
             <command id="vscode.java.resolveMainMethod"/>
             <command id="vscode.java.inferLaunchCommandLength"/>
+            <command id="vscode.java.checkProjectSettings"/>
        </delegateCommandHandler>
    </extension>
 </plugin>

com.microsoft.java.debug.plugin/src/main/java/com/microsoft/java/debug/plugin/internal/JavaDebugDelegateCommandHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright (c) 2017 Microsoft Corporation and others.
+* Copyright (c) 2017-2019 Microsoft Corporation 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
@@ -30,6 +30,7 @@ public class JavaDebugDelegateCommandHandler implements IDelegateCommandHandler
     public static final String VALIDATE_LAUNCHCONFIG = "vscode.java.validateLaunchConfig";
     public static final String RESOLVE_MAINMETHOD = "vscode.java.resolveMainMethod";
     public static final String INFER_LAUNCH_COMMAND_LENGTH = "vscode.java.inferLaunchCommandLength";
+    public static final String CHECK_PROJECT_SETTINGS = "vscode.java.checkProjectSettings";
 
     @Override
     public Object executeCommand(String commandId, List<Object> arguments, IProgressMonitor progress) throws Exception {
@@ -57,6 +58,8 @@ public Object executeCommand(String commandId, List<Object> arguments, IProgress
                 return ResolveMainMethodHandler.resolveMainMethods(arguments);
             case INFER_LAUNCH_COMMAND_LENGTH:
                 return LaunchCommandHandler.getLaunchCommandLength(JsonUtils.fromJson((String) arguments.get(0), LaunchArguments.class));
+            case CHECK_PROJECT_SETTINGS:
+                return ProjectSettingsChecker.check(JsonUtils.fromJson((String) arguments.get(0), ProjectSettingsChecker.ProjectSettingsCheckerParams.class));
             default:
                 break;
         }

com.microsoft.java.debug.plugin/src/main/java/com/microsoft/java/debug/plugin/internal/ProjectSettingsChecker.java

@@ -0,0 +1,65 @@
+/*******************************************************************************
+ * Copyright (c) 2019 Microsoft Corporation 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
+ *
+ * Contributors:
+ *     Microsoft Corporation - initial API and implementation
+ *******************************************************************************/
+
+package com.microsoft.java.debug.plugin.internal;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+
+import org.apache.commons.lang3.StringUtils;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.jdt.core.IJavaProject;
+
+public class ProjectSettingsChecker {
+    /**
+     * Check whether the project settings are all matched as the expected.
+     * @param params - The checker parameters
+     * @return true if all settings is matched
+     */
+    public static boolean check(ProjectSettingsCheckerParams params) {
+        Map<String, String> options = new HashMap<>();
+        IJavaProject javaProject = null;
+        if (StringUtils.isNotBlank(params.projectName)) {
+            javaProject = JdtUtils.getJavaProject(params.projectName);
+        } else if (StringUtils.isNotBlank(params.className)) {
+            try {
+                List<IJavaProject> projects = ResolveClasspathsHandler.getJavaProjectFromType(params.className);
+                if (!projects.isEmpty()) {
+                    javaProject = projects.get(0);
+                }
+            } catch (CoreException e) {
+                // do nothing
+            }
+        }
+
+        if (javaProject != null) {
+            options = javaProject.getOptions(params.inheritedOptions);
+        }
+
+        for (Entry<String, String> expected : params.expectedOptions.entrySet()) {
+            if (!Objects.equals(options.get(expected.getKey()), expected.getValue())) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public static class ProjectSettingsCheckerParams {
+        String className;
+        String projectName;
+        boolean inheritedOptions;
+        Map<String, String> expectedOptions;
+    }
+}