Source Code Cross Referenced for AvoidStarImportCheck.java in  » Code-Analyzer » checkstyle » com » puppycrawl » tools » checkstyle » checks » imports » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Code Analyzer » checkstyle » com.puppycrawl.tools.checkstyle.checks.imports 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        ////////////////////////////////////////////////////////////////////////////////
02:        // checkstyle: Checks Java source code for adherence to a set of rules.
03:        // Copyright (C) 2001-2007  Oliver Burn
04:        //
05:        // This library is free software; you can redistribute it and/or
06:        // modify it under the terms of the GNU Lesser General Public
07:        // License as published by the Free Software Foundation; either
08:        // version 2.1 of the License, or (at your option) any later version.
09:        //
10:        // This library is distributed in the hope that it will be useful,
11:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
12:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13:        // Lesser General Public License for more details.
14:        //
15:        // You should have received a copy of the GNU Lesser General Public
16:        // License along with this library; if not, write to the Free Software
17:        // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18:        ////////////////////////////////////////////////////////////////////////////////
19:        package com.puppycrawl.tools.checkstyle.checks.imports;
20:
21:        import com.puppycrawl.tools.checkstyle.api.Check;
22:        import com.puppycrawl.tools.checkstyle.api.DetailAST;
23:        import com.puppycrawl.tools.checkstyle.api.FullIdent;
24:        import com.puppycrawl.tools.checkstyle.api.TokenTypes;
25:
26:        /**
27:         * <p>
28:         * Check that finds import statements that use the * notation.
29:         * </p>
30:         * <p> Rationale: Importing all classes from a package leads to tight coupling
31:         * between packages and might lead to problems when a new version of a library
32:         * introduces name clashes.
33:         * </p>
34:         * <p>
35:         * An example of how to configure the check is:
36:         * </p>
37:         * <pre>
38:         * &lt;module name="AvoidStarImport"&gt;
39:         *   &lt;property name="excludes" value="java.io,java.net"/&gt;
40:         * &lt;/module&gt;
41:         * </pre>
42:         *
43:         * The optional "excludes" property allows for certain packages like
44:         * java.io or java.net to be exempted from the rule. Note that the excludes
45:         * property is not recursive, subpackages of excluded packages are not
46:         * automatically excluded.
47:         *
48:         * Compatible with Java 1.5 source.
49:         *
50:         * @author Oliver Burn
51:         * @author <a href="bschneider@vecna.com">Bill Schneider</a>
52:         * @version 1.0
53:         */
54:        public class AvoidStarImportCheck extends Check {
55:            /** the packages to exempt from this check. */
56:            private String[] mExcludes = new String[0];
57:
58:            /** {@inheritDoc} */
59:            public int[] getDefaultTokens() {
60:                return new int[] { TokenTypes.IMPORT };
61:            }
62:
63:            /**
64:             * Sets the list of packages to exempt from the check.
65:             * @param aExcludes a list of package names where star imports are ok
66:             */
67:            public void setExcludes(String[] aExcludes) {
68:                mExcludes = new String[aExcludes.length];
69:                for (int i = 0; i < aExcludes.length; i++) {
70:                    mExcludes[i] = aExcludes[i];
71:                    if (!mExcludes[i].endsWith(".*")) {
72:                        // force all package names to end with ".*" to disambiguate
73:                        // "java.io"
74:                        mExcludes[i] = mExcludes[i] + ".*";
75:                    }
76:                }
77:            }
78:
79:            /** {@inheritDoc} */
80:            public void visitToken(DetailAST aAST) {
81:                final FullIdent name = FullIdent.createFullIdentBelow(aAST);
82:                if ((name != null) && name.getText().endsWith(".*")) {
83:                    boolean exempt = false;
84:                    for (int i = 0; (i < mExcludes.length) && !exempt; i++) {
85:                        if (name.getText().equals(mExcludes[i])) {
86:                            exempt = true;
87:                        }
88:                    }
89:                    if (!exempt) {
90:                        log(aAST.getLineNo(), "import.avoidStar", name
91:                                .getText());
92:                    }
93:                }
94:            }
95:        }
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