content: /*
   * Copyright 2016 HuntBugs contributors
   * 
   * 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 one.util.huntbugs.detect;
  
  import java.util.Set;
  
  import com.strobel.assembler.metadata.MethodDefinition;
  import com.strobel.assembler.metadata.MethodReference;
  import com.strobel.decompiler.ast.AstCode;
  import com.strobel.decompiler.ast.Expression;
  
  import one.util.huntbugs.flow.Inf;
  import one.util.huntbugs.registry.MethodContext;
  import one.util.huntbugs.registry.anno.AstNodes;
  import one.util.huntbugs.registry.anno.AstVisitor;
  import one.util.huntbugs.registry.anno.WarningDefinition;
  import one.util.huntbugs.util.Nodes;
  import one.util.huntbugs.warning.Roles;
  import one.util.huntbugs.warning.WarningAnnotation;
  import one.util.huntbugs.warning.WarningAnnotation.MemberInfo;
  
  /**
   * @author Tagir Valeev
   *
   */
  @WarningDefinition(category = "Performance", name = "NumberConstructor", maxScore = 45)
  @WarningDefinition(category = "Performance", name = "BooleanConstructor", maxScore = 55)
  public class NumberConstructor {
      @AstVisitor(nodes = AstNodes.EXPRESSIONS)
      public void visit(Expression expr, MethodContext ctx, MethodDefinition md) {
          if (expr.getCode() == AstCode.InitObject && expr.getArguments().size() == 1) {
              MethodReference ctor = (MethodReference) expr.getOperand();
              if (ctor.getDeclaringType().getPackageName().equals("java.lang")) {
                  String simpleName = ctor.getDeclaringType().getSimpleName();
                  WarningAnnotation<MemberInfo> replacement = Roles.REPLACEMENT_METHOD.create(ctor.getDeclaringType()
                          .getInternalName(), "valueOf", ctor.getSignature().replaceFirst("V$", "L" + ctor
                                  .getDeclaringType().getInternalName() + ";"));
                  int priority = 0;
                  if(md.isTypeInitializer()) {
                      // Static field initializer: only one object is created
                      // not a big performance problem and probably intended
                      Set<Expression> usages = Inf.BACKLINK.findUsages(expr);
                      if(usages.size() == 1 && usages.iterator().next().getCode() == AstCode.PutStatic) {
                          priority = 15;
                      }
                  }
                  if (simpleName.equals("Boolean")) {
                      ctx.report("BooleanConstructor", priority, expr, replacement);
                  } else if (simpleName.equals("Integer") || simpleName.equals("Long") || simpleName.equals("Short")
                      || simpleName.equals("Byte") || simpleName.equals("Character")) {
                      Object val = Nodes.getConstant(expr.getArguments().get(0));
                      if (val instanceof Number) {
                          long value = ((Number) val).longValue();
                          if (value < -128 || value > 127)
                              priority += simpleName.equals("Integer") ? 15 : 30;
                          ctx.report("NumberConstructor", priority, expr, Roles.NUMBER.create((Number) val), replacement,
                              Roles.TARGET_TYPE.create(ctor.getDeclaringType()));
                      } else {
                          ctx.report("NumberConstructor", 5, expr, replacement, Roles.TARGET_TYPE.create(ctor
                                  .getDeclaringType()));
                      }
                  }
              }
          }
      }
  
  }
  