split PsiVcsSelectionProvider into java and xml parts

java/java-impl/src/com/intellij/vcsUtil/JavaVcsSelectionProvider.java

@@ -0,0 +1,70 @@
+package com.intellij.vcsUtil;
+
+import com.intellij.codeInsight.TargetElementUtilBase;
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.fileEditor.FileDocumentManager;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.openapi.vcs.VcsBundle;
+import com.intellij.openapi.vcs.actions.VcsContext;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.*;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * @author yole
+ */
+public class JavaVcsSelectionProvider implements VcsSelectionProvider {
+  @Nullable
+  public VcsSelection getSelection(final VcsContext context) {
+    final Editor editor = context.getEditor();
+    if (editor == null) return null;
+    PsiElement psiElement = TargetElementUtilBase.findTargetElement(editor, TargetElementUtilBase.ELEMENT_NAME_ACCEPTED);
+    if (psiElement == null) {
+      return null;
+    }
+    if (!psiElement.isValid()) {
+      return null;
+    }
+    if (psiElement instanceof PsiCompiledElement) {
+      return null;
+    }
+
+    final String actionName;
+
+    if (psiElement instanceof PsiClass) {
+      actionName = VcsBundle.message("action.name.show.history.for.class");
+    }
+    else if (psiElement instanceof PsiField) {
+      actionName = VcsBundle.message("action.name.show.history.for.field");
+    }
+    else if (psiElement instanceof PsiMethod) {
+      actionName = VcsBundle.message("action.name.show.history.for.method");
+    }
+    else if (psiElement instanceof PsiCodeBlock) {
+      actionName = VcsBundle.message("action.name.show.history.for.code.block");
+    }
+    else if (psiElement instanceof PsiStatement) {
+      actionName = VcsBundle.message("action.name.show.history.for.statement");
+    }
+    else {
+      return null;
+    }
+
+    TextRange textRange = psiElement.getTextRange();
+    if (textRange == null) {
+      return null;
+    }
+
+    VirtualFile virtualFile = psiElement.getContainingFile().getVirtualFile();
+    if (virtualFile == null) {
+      return null;
+    }
+    if (!virtualFile.isValid()) {
+      return null;
+    }
+
+    Document document = FileDocumentManager.getInstance().getDocument(virtualFile);
+    return new VcsSelection(document, textRange, actionName);
+  }
+}