1 files changed, 39 insertions, 0 deletions
diff --git a/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/filters/ExpressionFilter.java b/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/filters/ExpressionFilter.java
new file mode 100644
index 000000000000..632cc403eabb
--- /dev/null
+++ b/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/filters/ExpressionFilter.java
@@ -0,0 +1,39 @@
+package com.intellij.structuralsearch.impl.matcher.filters;
+
+import com.intellij.dupLocator.util.NodeFilter;
+import com.intellij.psi.JavaElementVisitor;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiExpression;
+import com.intellij.psi.PsiReferenceExpression;
+
+/**
+ * Filters expression nodes
+ */
+public class ExpressionFilter extends JavaElementVisitor implements NodeFilter {
+  protected boolean result;
+
+  @Override public void visitReferenceExpression(PsiReferenceExpression psiReferenceExpression) {
+    result = true;
+  }
+
+  @Override public void visitExpression(PsiExpression psiExpression) {
+    result = true;
+  }
+
+  private static class NodeFilterHolder {
+    private static final NodeFilter instance = new ExpressionFilter();
+  }
+
+  public static NodeFilter getInstance() {
+    return NodeFilterHolder.instance;
+  }
+
+  private ExpressionFilter() {
+  }
+
+  public boolean accepts(PsiElement element) {
+    result = false;
+    if (element!=null) element.accept(this);
+    return result;
+  }
+}