com.facebook.buck.query.QueryTargetCollector.java Source code

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Here is the source code for com.facebook.buck.query.QueryTargetCollector.java

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/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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.facebook.buck.query;

import com.facebook.buck.core.exceptions.HumanReadableException;
import com.google.common.collect.ImmutableSet;

class QueryTargetCollector implements QueryExpression.Visitor {
    private final ImmutableSet.Builder<QueryTarget> targets;
    private final QueryEnvironment env;

    QueryTargetCollector(QueryEnvironment env) {
        this.targets = ImmutableSet.builder();
        this.env = env;
    }

    @Override
    public QueryExpression.VisitResult visit(QueryExpression exp) {
        if (exp instanceof TargetLiteral) {
            try {
                targets.addAll(env.getTargetsMatchingPattern(((TargetLiteral) exp).getPattern()));
            } catch (QueryException e) {
                throw new HumanReadableException(e, "Error computing targets from literal [%s]", exp);
            }
        }

        if (exp instanceof TargetSetExpression) {
            targets.addAll(((TargetSetExpression) exp).getTargets());
        }

        return QueryExpression.VisitResult.CONTINUE;
    }

    ImmutableSet<QueryTarget> getTargets() {
        return targets.build();
    }
}