Refactored analysis into a build participant

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/builder/AnalysisServerParticipant.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/builder/AnalysisServerParticipant.java
===================================================================
--- editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/builder/AnalysisServerParticipant.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/builder/AnalysisServerParticipant.java	(revision 0)
@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2012, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.dart.tools.core.internal.builder;
+
+import com.google.dart.tools.core.DartCore;
+import com.google.dart.tools.core.DartCoreDebug;
+import com.google.dart.tools.core.analysis.AnalysisServer;
+import com.google.dart.tools.core.builder.BuildEvent;
+import com.google.dart.tools.core.builder.BuildParticipant;
+import com.google.dart.tools.core.builder.BuildVisitor;
+import com.google.dart.tools.core.builder.CleanEvent;
+import com.google.dart.tools.core.internal.model.PackageLibraryManagerProvider;
+
+import static com.google.dart.tools.core.internal.util.Extensions.DOT_DART;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IResourceDelta;
+import org.eclipse.core.resources.IResourceProxy;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.IProgressMonitor;
+
+import static org.eclipse.core.resources.IResource.DEPTH_INFINITE;
+import static org.eclipse.core.resources.IResource.FILE;
+
+import java.io.File;
+
+/**
+ * Performs source analysis using instances of {@link AnalysisServer} and DartC.
+ * {@link AnalysisEngineParticipant} should be disabled when this participant is enabled.
+ * 
+ * @see DartCoreDebug#ENABLE_NEW_ANALYSIS
+ */
+public class AnalysisServerParticipant implements BuildParticipant, BuildVisitor {
+
+  private final AnalysisServer server;
+  private final boolean enabled;
+
+  public AnalysisServerParticipant() {
+    this(
+        PackageLibraryManagerProvider.getDefaultAnalysisServer(),
+        !DartCoreDebug.ENABLE_NEW_ANALYSIS);
+  }
+
+  public AnalysisServerParticipant(AnalysisServer server, boolean enabled) {
+    this.server = server;
+    this.enabled = enabled;
+  }
+
+  @Override
+  public void build(BuildEvent event, IProgressMonitor monitor) throws CoreException {
+
+    // This participant and AnalysisEngineParticipant are mutually exclusive
+    if (!enabled) {
+      return;
+    }
+
+    event.traverse(this, true);
+  }
+
+  @Override
+  public void clean(CleanEvent event, IProgressMonitor monitor) throws CoreException {
+
+    // This participant and AnalysisEngineParticipant are mutually exclusive
+    if (!enabled) {
+      return;
+    }
+
+    IProject project = event.getProject();
+    project.deleteMarkers(DartCore.DART_PROBLEM_MARKER_TYPE, true, DEPTH_INFINITE);
+    IPath location = project.getLocation();
+    if (location != null) {
+      server.discard(location.toFile());
+    }
+  }
+
+  @Override
+  public boolean visit(IResourceDelta delta, IProgressMonitor monitor) throws CoreException {
+    IResource resource = delta.getResource();
+
+    // Ignore files that are not dart related
+    if (resource.getType() == FILE && !resource.getName().endsWith(DOT_DART)) {
+      return false;
+    }
+
+    // Discard any resources that have been removed 
+    if (delta.getKind() == IResourceDelta.REMOVED) {
+      IPath location = resource.getLocation();
+      if (location != null) {
+        server.discard(location.toFile());
+      }
+      return false;
+    }
+
+    // Recurse into any containers
+    if (resource.getType() != FILE) {
+      return true;
+    }
+
+    // Notify server of any changed *.dart files
+    IPath location = resource.getLocation();
+    if (location != null) {
+      server.changed(location.toFile());
+    }
+    return false;
+  }
+
+  @Override
+  public boolean visit(IResourceProxy proxy, IProgressMonitor monitor) throws CoreException {
+    IResource resource = proxy.requestResource();
+
+    // Ignore files that are not dart related
+    if (resource.getType() == FILE && !resource.getName().endsWith(DOT_DART)) {
+      return false;
+    }
+
+    // If a *.dart file or a directory is added in the "packages" directory
+    // then re-analyze the containing application directory
+    IPath fullPath = resource.getFullPath();
+    int segmentCount = fullPath.segmentCount();
+    for (int index = 0; index < segmentCount; index++) {
+      if (fullPath.segment(index).equals(DartCore.PACKAGES_DIRECTORY_NAME)) {
+        for (int count = index > 0 ? index : 1; count < segmentCount; count++) {
+          resource = resource.getParent();
+        }
+        IPath location = resource.getLocation();
+        if (location != null) {
+          File file = location.toFile();
+          server.discard(file);
+          server.scan(file, null);
+        }
+        return false;
+      }
+    }
+
+    // Scan the newly added resources
+    IPath location = resource.getLocation();
+    if (location != null) {
+      File file = location.toFile();
+      server.scan(file, null);
+    }
+    return false;
+  }
+
+  /**
+   * If the resource is in the "packages" directory hierarchy, then return the application directory
+   * containing that "packages" directory, otherwise return {@code null}.
+   * 
+   * @param resource the resource (not {@code null})
+   * @return the resource or the application directory resource (not {@code null})
+   */
+  private IResource getPackagesParent(IResource resource) {
+    IPath fullPath = resource.getFullPath();
+    int segmentCount = fullPath.segmentCount();
+    for (int index = 0; index < segmentCount; index++) {
+      if (fullPath.segment(index).equals(DartCore.PACKAGES_DIRECTORY_NAME)) {
+        for (int count = index > 0 ? index : 1; count < segmentCount; count++) {
+          ;
+        }
+        resource = resource.getParent();
+        return resource;
+      }
+    }
+    return null;
+  }
+}