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/*
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* Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.tools.javac.code;
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import java.util.EnumSet;
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import java.util.HashMap;
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import java.util.Map;
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import com.sun.tools.javac.code.Symbol.*;
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import com.sun.tools.javac.util.Context;
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import com.sun.tools.javac.util.List;
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import com.sun.tools.javac.util.Options;
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import com.sun.tools.javac.util.Pair;
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import static com.sun.tools.javac.code.Flags.*;
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/**
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* A class for handling -Xlint suboptions and @SuppresssWarnings.
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*
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* <p><b>This is NOT part of any API supported by Sun Microsystems. If
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* you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class Lint
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{
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/** The context key for the root Lint object. */
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protected static final Context.Key<Lint> lintKey = new Context.Key<Lint>();
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/** Get the root Lint instance. */
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public static Lint instance(Context context) {
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Lint instance = context.get(lintKey);
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if (instance == null)
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instance = new Lint(context);
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return instance;
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}
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/**
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* Returns the result of combining the values in this object with
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* the given annotation.
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*/
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public Lint augment(Attribute.Compound attr) {
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return augmentor.augment(this, attr);
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}
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/**
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* Returns the result of combining the values in this object with
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* the given annotations.
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*/
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public Lint augment(List<Attribute.Compound> attrs) {
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return augmentor.augment(this, attrs);
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}
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/**
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* Returns the result of combining the values in this object with
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* the given annotations and flags.
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*/
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public Lint augment(List<Attribute.Compound> attrs, long flags) {
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Lint l = augmentor.augment(this, attrs);
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if ((flags & DEPRECATED) != 0) {
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if (l == this)
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l = new Lint(this);
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l.values.remove(LintCategory.DEPRECATION);
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l.suppressedValues.add(LintCategory.DEPRECATION);
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}
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return l;
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}
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private final AugmentVisitor augmentor;
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private final EnumSet<LintCategory> values;
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private final EnumSet<LintCategory> suppressedValues;
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private static Map<String, LintCategory> map = new HashMap<String,LintCategory>();
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protected Lint(Context context) {
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// initialize values according to the lint options
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Options options = Options.instance(context);
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values = EnumSet.noneOf(LintCategory.class);
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for (Map.Entry<String, LintCategory> e: map.entrySet()) {
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if (options.lint(e.getKey()))
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values.add(e.getValue());
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}
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suppressedValues = EnumSet.noneOf(LintCategory.class);
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context.put(lintKey, this);
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augmentor = new AugmentVisitor(context);
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}
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protected Lint(Lint other) {
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this.augmentor = other.augmentor;
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this.values = other.values.clone();
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this.suppressedValues = other.suppressedValues.clone();
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}
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public String toString() {
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return "Lint:[values" + values + " suppressedValues" + suppressedValues + "]";
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}
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/**
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* Categories of warnings that can be generated by the compiler.
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*/
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public enum LintCategory {
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/**
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* Warn about use of unnecessary casts.
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*/
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CAST("cast"),
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/**
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* Warn about use of deprecated items.
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*/
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DEPRECATION("deprecation"),
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/**
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* Warn about items which are documented with an {@code @deprecated} JavaDoc
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* comment, but which do not have {@code @Deprecated} annotation.
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*/
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DEP_ANN("dep-ann"),
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/**
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* Warn about division by constant integer 0.
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*/
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DIVZERO("divzero"),
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/**
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* Warn about empty statement after if.
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*/
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EMPTY("empty"),
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/**
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* Warn about falling through from one case of a switch statement to the next.
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*/
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FALLTHROUGH("fallthrough"),
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/**
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* Warn about finally clauses that do not terminate normally.
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*/
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FINALLY("finally"),
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/**
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* Warn about issues regarding method overrides.
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*/
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OVERRIDES("overrides"),
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/**
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* Warn about invalid path elements on the command line.
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* Such warnings cannot be suppressed with the SuppressWarnings
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* annotation.
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*/
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PATH("path"),
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/**
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* Warn about Serializable classes that do not provide a serial version ID.
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*/
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SERIAL("serial"),
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/**
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* Warn about unchecked operations on raw types.
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*/
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UNCHECKED("unchecked"),
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/**
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* Warn about unchecked operations on raw types.
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*/
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RAW("rawtypes");
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LintCategory(String option) {
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this.option = option;
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map.put(option, this);
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}
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static LintCategory get(String option) {
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return map.get(option);
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}
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public final String option;
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};
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/**
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* Checks if a warning category is enabled. A warning category may be enabled
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* on the command line, or by default, and can be temporarily disabled with
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* the SuppressWarnings annotation.
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*/
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public boolean isEnabled(LintCategory lc) {
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return values.contains(lc);
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}
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/**
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* Checks is a warning category has been specifically suppressed, by means
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* of the SuppressWarnings annotation, or, in the case of the deprecated
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* category, whether it has been implicitly suppressed by virtue of the
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* current entity being itself deprecated.
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*/
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public boolean isSuppressed(LintCategory lc) {
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return suppressedValues.contains(lc);
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}
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protected static class AugmentVisitor implements Attribute.Visitor {
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private final Context context;
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private Symtab syms;
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private Lint parent;
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private Lint lint;
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AugmentVisitor(Context context) {
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// to break an ugly sequence of initialization dependencies,
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// we defer the initialization of syms until it is needed
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this.context = context;
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}
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Lint augment(Lint parent, Attribute.Compound attr) {
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initSyms();
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this.parent = parent;
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lint = null;
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attr.accept(this);
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return (lint == null ? parent : lint);
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}
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Lint augment(Lint parent, List<Attribute.Compound> attrs) {
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initSyms();
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this.parent = parent;
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lint = null;
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for (Attribute.Compound a: attrs) {
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a.accept(this);
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}
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return (lint == null ? parent : lint);
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}
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private void initSyms() {
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if (syms == null)
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syms = Symtab.instance(context);
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}
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private void suppress(LintCategory lc) {
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if (lint == null)
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lint = new Lint(parent);
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lint.suppressedValues.add(lc);
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lint.values.remove(lc);
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}
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public void visitConstant(Attribute.Constant value) {
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if (value.type.tsym == syms.stringType.tsym) {
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LintCategory lc = LintCategory.get((String) (value.value));
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if (lc != null)
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suppress(lc);
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}
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}
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public void visitClass(Attribute.Class clazz) {
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}
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// If we find a @SuppressWarnings annotation, then we continue
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// walking the tree, in order to suppress the individual warnings
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// specified in the @SuppressWarnings annotation.
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public void visitCompound(Attribute.Compound compound) {
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if (compound.type.tsym == syms.suppressWarningsType.tsym) {
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for (List<Pair<MethodSymbol,Attribute>> v = compound.values;
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v.nonEmpty(); v = v.tail) {
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Pair<MethodSymbol,Attribute> value = v.head;
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if (value.fst.name.toString().equals("value"))
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value.snd.accept(this);
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}
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}
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}
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public void visitArray(Attribute.Array array) {
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for (Attribute value : array.values)
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value.accept(this);
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}
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public void visitEnum(Attribute.Enum e) {
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}
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public void visitError(Attribute.Error e) {
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}
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};
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}
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