org.codenarc.rule.basic.IntegerGetIntegerRule.groovy Maven / Gradle / Ivy

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The CodeNarc project provides a static analysis tool for Groovy code.

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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 org.codenarc.rule.basic

import org.codehaus.groovy.ast.expr.MethodCallExpression
import org.codenarc.rule.AbstractAstVisitorRule
import org.codenarc.rule.AbstractMethodCallExpressionVisitor
import org.codenarc.util.AstUtil

/**
 * This rule catches usages of java.lang.Integer.getInteger(String, ...) which reads an Integer from the System properties.
 * It is often mistakenly used to attempt to read user input or parse a String into an Integer. It is a poor piece of API
 * to use; replace it with System.properties['prop'].
 *
 * @author 'Hamlet D'Arcy'
 */
class IntegerGetIntegerRule extends AbstractAstVisitorRule {
    String name = 'IntegerGetInteger'
    int priority = 2
    Class astVisitorClass = IntegerGetIntegerAstVisitor
}

class IntegerGetIntegerAstVisitor extends AbstractMethodCallExpressionVisitor {
    @Override
    void visitMethodCallExpression(MethodCallExpression call) {
        if (AstUtil.isMethodCall(call, 'Integer', 'getInteger', 1)) {
            addViolation call, 'Integer.getInteger(String) is a confusing API for reading System properties. Prefer the System.getProperty(String) API.'
        } else if (AstUtil.isMethodCall(call, 'Integer', 'getInteger', 2)) {
            addViolation call, 'Integer.getInteger(String, Integer) is a confusing API for reading System properties. Prefer the System.getProperty(String) API.'
        }
    }
}