| /* |
| * 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.refactoring.removemiddleman; |
| |
| import com.intellij.psi.*; |
| import com.intellij.util.ArrayUtil; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| public class DelegationUtils { |
| private DelegationUtils() { |
| super(); |
| } |
| |
| |
| |
| public static Set<PsiMethod> getDelegatingMethodsForField(PsiField field) { |
| final Set<PsiMethod> out = new HashSet<PsiMethod>(); |
| final PsiClass containingClass = field.getContainingClass(); |
| if (containingClass == null) { |
| return out; |
| } |
| final PsiMethod[] methods = containingClass.getMethods(); |
| for (PsiMethod method : methods) { |
| if (isDelegation(field, method)) { |
| out.add(method); |
| } |
| } |
| return out; |
| } |
| |
| private static boolean isDelegation(PsiField field, PsiMethod method) { |
| if (method.isConstructor()) { |
| return false; |
| } |
| final PsiCodeBlock body = method.getBody(); |
| if (body == null) { |
| return false; |
| } |
| final PsiStatement[] statements = body.getStatements(); |
| if (statements.length != 1) { |
| return false; |
| } |
| final PsiStatement statement = statements[0]; |
| if (statement instanceof PsiReturnStatement) { |
| final PsiExpression returnValue = ((PsiReturnStatement)statement).getReturnValue(); |
| if (!isDelegationCall(returnValue, field, method)) { |
| return false; |
| } |
| } |
| else if (statement instanceof PsiExpressionStatement) { |
| final PsiExpression value = ((PsiExpressionStatement)statement).getExpression(); |
| if (!isDelegationCall(value, field, method)) { |
| return false; |
| } |
| } |
| else { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| public static boolean isAbstract(PsiMethod method) { |
| if (method.hasModifierProperty(PsiModifier.ABSTRACT)) { |
| return true; |
| } |
| return method.getContainingClass().isInterface(); |
| } |
| |
| private static boolean isDelegationCall(PsiExpression expression, PsiField field, PsiMethod method) { |
| if (!(expression instanceof PsiMethodCallExpression)) { |
| return false; |
| } |
| final PsiMethodCallExpression call = (PsiMethodCallExpression)expression; |
| final PsiReferenceExpression methodExpression = call.getMethodExpression(); |
| final PsiExpression qualifier = methodExpression.getQualifierExpression(); |
| if (!(qualifier instanceof PsiReferenceExpression)) { |
| return false; |
| } |
| final PsiElement referent = ((PsiReference)qualifier).resolve(); |
| if (referent == null || !referent.equals(field)) { |
| return false; |
| } |
| final PsiExpressionList argumentList = call.getArgumentList(); |
| final PsiExpression[] args = argumentList.getExpressions(); |
| for (PsiExpression arg : args) { |
| if (!isParameterReference(arg, method)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static boolean isParameterReference(PsiExpression arg, PsiMethod method) { |
| if (!(arg instanceof PsiReferenceExpression)) { |
| return false; |
| } |
| final PsiElement referent = ((PsiReference)arg).resolve(); |
| if (!(referent instanceof PsiParameter)) { |
| return false; |
| } |
| final PsiElement declarationScope = ((PsiParameter)referent).getDeclarationScope(); |
| return method.equals(declarationScope); |
| } |
| |
| |
| public static int[] getParameterPermutation(PsiMethod method) { |
| final PsiCodeBlock body = method.getBody(); |
| assert body != null; |
| final PsiStatement[] statements = body.getStatements(); |
| final PsiStatement statement = statements[0]; |
| final PsiParameterList parameterList = method.getParameterList(); |
| if (statement instanceof PsiReturnStatement) { |
| final PsiExpression returnValue = ((PsiReturnStatement)statement).getReturnValue(); |
| final PsiMethodCallExpression call = (PsiMethodCallExpression)returnValue; |
| return calculatePermutation(call, parameterList); |
| } |
| else { |
| final PsiExpression value = ((PsiExpressionStatement)statement).getExpression(); |
| final PsiMethodCallExpression call = (PsiMethodCallExpression)value; |
| return calculatePermutation(call, parameterList); |
| } |
| } |
| |
| private static int[] calculatePermutation(PsiMethodCallExpression call, PsiParameterList parameterList) { |
| final PsiExpressionList argumentList = call.getArgumentList(); |
| final PsiExpression[] args = argumentList.getExpressions(); |
| final int[] out = ArrayUtil.newIntArray(args.length); |
| for (int i = 0; i < args.length; i++) { |
| final PsiExpression arg = args[i]; |
| final PsiParameter parameter = (PsiParameter)((PsiReference)arg).resolve(); |
| out[i] = parameterList.getParameterIndex(parameter); |
| } |
| return out; |
| } |
| |
| public static PsiMethod getDelegatedMethod(PsiMethod method) { |
| final PsiCodeBlock body = method.getBody(); |
| assert body != null; |
| final PsiStatement[] statements = body.getStatements(); |
| final PsiStatement statement = statements[0]; |
| if (statement instanceof PsiReturnStatement) { |
| final PsiExpression returnValue = ((PsiReturnStatement)statement).getReturnValue(); |
| final PsiMethodCallExpression call = (PsiMethodCallExpression)returnValue; |
| assert call != null; |
| return call.resolveMethod(); |
| } |
| else { |
| final PsiExpression value = ((PsiExpressionStatement)statement).getExpression(); |
| final PsiMethodCallExpression call = (PsiMethodCallExpression)value; |
| return call.resolveMethod(); |
| } |
| } |
| } |