content: /*
   * Copyright 1999-2017 Alibaba Group.
   *
   * 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.alibaba.p3c.pmd.lang.java.rule.other;
  
  import com.alibaba.p3c.pmd.I18nResources;
  import com.alibaba.p3c.pmd.lang.AbstractXpathRule;
  import com.alibaba.p3c.pmd.lang.java.util.VariableUtils;
  import com.alibaba.p3c.pmd.lang.java.util.ViolationUtils;
  
  import net.sourceforge.pmd.lang.ast.Node;
  import net.sourceforge.pmd.lang.java.ast.ASTLocalVariableDeclaration;
  
  /**
   * When using regex, precompile needs to be done in order to increase the matching performance.
   * Note: Do not define Pattern pattern = Pattern.compile(.); within method body.
   *
   * @author keriezhang
   * @date 2016/12/14
   */
  public class AvoidPatternCompileInMethodRule extends AbstractXpathRule {
      /**
       * The parameter of Pattern.compile cannot be a string literal.
       */
      private static final String XPATH = "//MethodDeclaration//PrimaryExpression["
          + "PrimaryPrefix/Name[@Image='Pattern.compile'] and "
          + "PrimarySuffix/Arguments/ArgumentList/Expression/"
          + "PrimaryExpression/PrimaryPrefix/Literal[@StringLiteral='true']]";
  
      public AvoidPatternCompileInMethodRule() {
          setXPath(XPATH);
      }
  
      @Override
      public void addViolation(Object data, Node node, String arg) {
          ASTLocalVariableDeclaration localVariableDeclaration = node.getFirstParentOfType(
              ASTLocalVariableDeclaration.class);
          if (localVariableDeclaration == null) {
              super.addViolation(data, node, arg);
          } else {
              ViolationUtils.addViolationWithPrecisePosition(this, node, data,
                  I18nResources.getMessage("java.other.AvoidPatternCompileInMethodRule.violation.msg",
                      VariableUtils.getVariableName(localVariableDeclaration)));
          }
      }
  }
  