IDEA-89405 SpringEL should support static method calls

java/java-psi-impl/src/com/intellij/psi/scope/processor/MethodResolveProcessor.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2000-2009 JetBrains s.r.o.
+ *
+ *  Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ *  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.intellij.psi.scope.processor;
+
+import com.intellij.openapi.util.Key;
+import com.intellij.psi.PsiClass;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiMethod;
+import com.intellij.psi.ResolveState;
+import com.intellij.psi.scope.ElementClassHint;
+import com.intellij.psi.scope.NameHint;
+import com.intellij.psi.scope.PsiScopeProcessor;
+import com.intellij.util.containers.ContainerUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author Dmitry Avdeev
+ */
+public class MethodResolveProcessor implements PsiScopeProcessor, ElementClassHint, NameHint {
+
+  private final String myNameHint;
+  private final List<PsiMethod> myMethods = new ArrayList<PsiMethod>();
+
+  public MethodResolveProcessor() {
+    myNameHint = null;
+  }
+
+  public MethodResolveProcessor(final String name) {
+    myNameHint = name;
+  }
+
+  public PsiMethod[] getMethods() {
+    return myMethods.toArray(new PsiMethod[myMethods.size()]);
+  }
+
+  public boolean execute(@NotNull PsiElement element, ResolveState state) {
+    if (element instanceof PsiMethod) {
+      ContainerUtil.addIfNotNull(myMethods, (PsiMethod)element);
+    }
+    return true;
+  }
+
+  public <T> T getHint(@NotNull Key<T> hintKey) {
+    if (hintKey == ElementClassHint.KEY) {
+      return (T)this;
+    }
+    if (hintKey == NameHint.KEY && myNameHint != null) {
+      return (T)this;
+    }
+    return null;
+  }
+
+  public void handleEvent(Event event, Object associated) {
+  }
+
+  public boolean shouldProcess(DeclarationKind kind) {
+    return kind == DeclarationKind.METHOD;
+  }
+
+  public static PsiMethod[] findMethod(PsiClass psiClass, String methodName) {
+    MethodResolveProcessor processor = new MethodResolveProcessor(methodName);
+    psiClass.processDeclarations(processor, ResolveState.initial(), null, psiClass);
+    return processor.getMethods();
+  }
+
+  public static PsiMethod[] getAllMethods(PsiClass psiClass) {
+    MethodResolveProcessor processor = new MethodResolveProcessor();
+    psiClass.processDeclarations(processor, ResolveState.initial(), null, psiClass);
+    return processor.getMethods();
+  }
+
+
+  @Nullable
+  @Override
+  public String getName(ResolveState state) {
+    return myNameHint;
+  }
+}