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Issue #598: Forbid field access check implemented
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198 changes: 198 additions & 0 deletions
198
...ecks/src/main/java/com/github/sevntu/checkstyle/checks/coding/ForbidFieldAccessCheck.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,198 @@ | ||
| //////////////////////////////////////////////////////////////////////////////// | ||
| // checkstyle: Checks Java source code for adherence to a set of rules. | ||
| // Copyright (C) 2001-2020 the original author or authors. | ||
| // | ||
| // This library is free software; you can redistribute it and/or | ||
| // modify it under the terms of the GNU Lesser General Public | ||
| // License as published by the Free Software Foundation; either | ||
| // version 2.1 of the License, or (at your option) any later version. | ||
| // | ||
| // This library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| // Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public | ||
| // License along with this library; if not, write to the Free Software | ||
| // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| //////////////////////////////////////////////////////////////////////////////// | ||
|
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| package com.github.sevntu.checkstyle.checks.coding; | ||
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| import com.github.sevntu.checkstyle.SevntuUtil; | ||
| import com.puppycrawl.tools.checkstyle.api.AbstractCheck; | ||
| import com.puppycrawl.tools.checkstyle.api.DetailAST; | ||
| import com.puppycrawl.tools.checkstyle.api.FullIdent; | ||
| import com.puppycrawl.tools.checkstyle.api.TokenTypes; | ||
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| /** | ||
| * <p> | ||
| * Checks that certain fields are not used. This can be used to enforce that fields like e.g. | ||
| * {@link java.util.Locale#ROOT}. | ||
| * </p> | ||
| * | ||
| * <p> | ||
| * Parameters are: | ||
| * </p> | ||
| * | ||
| * <ul> | ||
| * <li><b>packageName</b> - The field package name to be forbidden.</li> | ||
| * <li><b>className</b> - The field class name to be forbidden.</li> | ||
| * <li><b>fieldName</b> - The field name to be forbidden.</li> | ||
| * </ul> | ||
| * | ||
| * <p> | ||
| * Together, these three parameters forms the field fully qualified name. | ||
| * </p> | ||
| * | ||
| * <p> | ||
| * Default parameters are: | ||
| * </p> | ||
| * | ||
| * <ul> | ||
| * <li><b>packageName</b>java.util</li> | ||
| * <li><b>className</b>Locale</li> | ||
| * <li><b>fieldName</b>ROOT</li> | ||
| * </ul> | ||
| * | ||
| * <p> | ||
| * which forbids the usage of {@link java.util.Locale#ROOT}. | ||
| * </p> | ||
| * | ||
| * @author <a href="mailto:[email protected]">Yasser Aziza</a> | ||
| * @since 1.38.0 | ||
| */ | ||
| public class ForbidFieldAccessCheck extends AbstractCheck { | ||
|
|
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| /** | ||
| * Warning message key. | ||
| */ | ||
| public static final String MSG_KEY = "forbid.field.access"; | ||
|
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| /** | ||
| * '.' character used as separator between FQN elements. | ||
| */ | ||
| private static final char DOT = '.'; | ||
|
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| /** | ||
| * Package name. | ||
| */ | ||
| private String packageName = "java.util"; | ||
|
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| /** | ||
| * Class name. | ||
| */ | ||
| private String className = "Locale"; | ||
|
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| /** | ||
| * Field name. | ||
| */ | ||
| private String fieldName = "ROOT"; | ||
|
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| /** | ||
| * Whether the field class was imported. | ||
| */ | ||
| private boolean wasPackageImported; | ||
|
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| /** | ||
| * Sets the package name, in which the field is declared. | ||
| * @param packageName the field name | ||
| */ | ||
| public void setPackageName(String packageName) { | ||
| this.packageName = packageName; | ||
| } | ||
|
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| /** | ||
| * Sets the class name, which declares the field. | ||
| * @param className the class name | ||
| */ | ||
| public void setClassName(String className) { | ||
| this.className = className; | ||
| } | ||
|
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| /** | ||
| * Sets the Field name, which should be forbidden to use. | ||
| * @param fieldName the field name | ||
| */ | ||
| public void setFieldName(String fieldName) { | ||
| this.fieldName = fieldName; | ||
| } | ||
|
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| /** | ||
| * Gets the field fully qualified name. | ||
| * @return {@link String} containing the field FQN | ||
| */ | ||
| private String getFieldFullyQualifiedName() { | ||
| return packageName + DOT + className + DOT + fieldName; | ||
| } | ||
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| @Override | ||
| public int[] getDefaultTokens() { | ||
| return new int[] { | ||
| TokenTypes.STATIC_IMPORT, | ||
| TokenTypes.IMPORT, | ||
| TokenTypes.IDENT, | ||
| }; | ||
| } | ||
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| @Override | ||
| public int[] getAcceptableTokens() { | ||
| return getDefaultTokens(); | ||
| } | ||
|
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| @Override | ||
| public int[] getRequiredTokens() { | ||
| return getDefaultTokens(); | ||
| } | ||
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| @Override | ||
| public void visitToken(DetailAST ast) { | ||
| if (isStaticImported(ast)) { | ||
| log(ast, MSG_KEY, getFieldFullyQualifiedName()); | ||
| } | ||
| else if (isPackageImported(ast)) { | ||
| // Mark forbidden field package as imported | ||
| wasPackageImported = true; | ||
| } | ||
| else if (TokenTypes.IDENT == ast.getType() && wasPackageImported && isSameType(ast)) { | ||
| log(ast.getPreviousSibling(), MSG_KEY, getFieldFullyQualifiedName()); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Checks whether the field is static imported. | ||
| * | ||
| * @param ast the {@link TokenTypes#STATIC_IMPORT} node to be checked | ||
| * @return {@code true} if the field was static imported, {@code false} otherwise | ||
| */ | ||
| private boolean isStaticImported(DetailAST ast) { | ||
| return TokenTypes.STATIC_IMPORT == ast.getType() | ||
| && getFieldFullyQualifiedName().equals(SevntuUtil.getText(ast)); | ||
| } | ||
|
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| /** | ||
| * Checks whether the field package is imported. | ||
| * | ||
| * @param ast the {@link TokenTypes#IMPORT} node to be checked | ||
| * @return {@code true} if the field was imported, {@code false} otherwise | ||
| */ | ||
| private boolean isPackageImported(DetailAST ast) { | ||
| final String importName = packageName + DOT + className; | ||
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| return TokenTypes.IMPORT == ast.getType() | ||
| && importName.equals(FullIdent.createFullIdentBelow(ast).getText()); | ||
| } | ||
|
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| /** | ||
| * Checks if the given {@link TokenTypes#IDENT} node has the same type as the forbidden field. | ||
| * | ||
| * @param ast the {@link TokenTypes#IDENT} node to be checked | ||
| * @return {@code true} if the field has the same FQN, {@code false} otherwise | ||
| */ | ||
| private boolean isSameType(DetailAST ast) { | ||
| return fieldName.equals(ast.getText()) | ||
| && ast.getPreviousSibling() != null | ||
| && className.equals(ast.getPreviousSibling().getText()); | ||
| } | ||
|
|
||
| } |
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