com.google.errorprone.scanner.ScannerSupplierImpl.java Source code

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Here is the source code for com.google.errorprone.scanner.ScannerSupplierImpl.java

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/*
 * Copyright 2014 Google Inc. All Rights Reserved.
 *
 * 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.google.errorprone.scanner;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.Iterables.getFirst;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import com.google.errorprone.BugCheckerInfo;
import com.google.errorprone.BugPattern;
import com.google.errorprone.bugpatterns.BugChecker;
import java.io.Serializable;

/**
 * An implementation of a {@link ScannerSupplier}, abstracted as a set of all known
 * {@link BugChecker}s and a set of enabled {@link BugChecker}s. The set of enabled suppliers must
 * be a subset of all known suppliers.
 */
class ScannerSupplierImpl extends ScannerSupplier implements Serializable {
    private final ImmutableBiMap<String, BugCheckerInfo> checks;
    private final ImmutableMap<String, BugPattern.SeverityLevel> severities;
    private final ImmutableSet<String> disabled;

    ScannerSupplierImpl(ImmutableBiMap<String, BugCheckerInfo> checks,
            ImmutableMap<String, BugPattern.SeverityLevel> severities, ImmutableSet<String> disabled) {
        checkArgument(Sets.difference(severities.keySet(), checks.keySet()).isEmpty(),
                "enabledChecks must be a subset of allChecks");
        checkArgument(Sets.difference(disabled, checks.keySet()).isEmpty(),
                "disabled must be a subset of allChecks");
        this.checks = checks;
        this.severities = severities;
        this.disabled = disabled;
    }

    private static final Function<BugCheckerInfo, BugChecker> INSTANTIATE_CHECKER = new Function<BugCheckerInfo, BugChecker>() {
        @Override
        public BugChecker apply(BugCheckerInfo checkerClass) {
            try {
                return checkerClass.checkerClass().getConstructor().newInstance();
            } catch (ReflectiveOperationException e) {
                throw new LinkageError("Could not instantiate BugChecker.", e);
            }
        }
    };

    @Override
    public ErrorProneScanner get() {
        return new ErrorProneScanner(Iterables.transform(getEnabledChecks(), INSTANTIATE_CHECKER), severities);
    }

    @Override
    public ImmutableBiMap<String, BugCheckerInfo> getAllChecks() {
        return checks;
    }

    @Override
    public ImmutableMap<String, BugPattern.SeverityLevel> severities() {
        return severities;
    }

    @Override
    protected ImmutableSet<String> disabled() {
        return disabled;
    }

    @Override
    public ImmutableSet<BugCheckerInfo> getEnabledChecks() {
        return FluentIterable.from(getAllChecks().values()).filter(new Predicate<BugCheckerInfo>() {
            @Override
            public boolean apply(BugCheckerInfo input) {
                return !disabled.contains(input.canonicalName());
            }
        }).toSet();
    }

    /** Returns the name of the first check, or {@code null}. */
    @Override
    public String toString() {
        return getFirst(getAllChecks().keySet(), null);
    }
}