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

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

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/*
 * Copyright 2016-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.model.HasBuildTarget;
import com.facebook.buck.rules.BuildTargetSourcePath;
import com.facebook.buck.rules.ParamInfo;
import com.facebook.buck.rules.PathSourcePath;
import com.facebook.buck.rules.SourcePath;
import com.facebook.buck.rules.TargetNode;
import com.facebook.buck.rules.coercer.DefaultTypeCoercerFactory;
import com.facebook.buck.rules.coercer.TypeCoercerFactory;
import com.facebook.buck.util.HumanReadableException;
import com.facebook.buck.util.ObjectMappers;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;

import java.lang.reflect.Field;
import java.nio.file.Path;

public class QueryTargetAccessor {

    private static final TypeCoercerFactory typeCoercerFactory = new DefaultTypeCoercerFactory(
            ObjectMappers.newDefaultInstance());

    private QueryTargetAccessor() {
    }

    public static <T> ImmutableSet<QueryTarget> getTargetsInAttribute(TargetNode<T, ?> node, String attribute) {
        try {
            final ImmutableSet.Builder<QueryTarget> builder = ImmutableSortedSet.naturalOrder();
            Class<?> constructorArgClass = node.getConstructorArg().getClass();
            Field field = constructorArgClass.getField(attribute);
            ParamInfo info = new ParamInfo(typeCoercerFactory, constructorArgClass, field);
            info.traverse(value -> {
                if (value instanceof Path) {
                    builder.add(QueryFileTarget.of((Path) value));
                } else if (value instanceof SourcePath) {
                    builder.add(extractSourcePath((SourcePath) value));
                } else if (value instanceof HasBuildTarget) {
                    builder.add(extractBuildTargetContainer((HasBuildTarget) value));
                }
            }, node.getConstructorArg());
            return builder.build();
        } catch (NoSuchFieldException e) {
            // Ignore if the field does not exist in this rule.
            return ImmutableSet.of();
        }
    }

    /**
     * Filters the objects in the given attribute that satisfy the given predicate.
     */
    public static <T> ImmutableSet<Object> filterAttributeContents(TargetNode<T, ?> node, String attribute,
            final Predicate<Object> predicate) {
        try {
            final ImmutableSet.Builder<Object> builder = ImmutableSet.builder();
            Class<?> constructorArgClass = node.getConstructorArg().getClass();
            Field field = constructorArgClass.getField(attribute);
            ParamInfo info = new ParamInfo(typeCoercerFactory, constructorArgClass, field);
            info.traverse(value -> {
                if (predicate.apply(value)) {
                    builder.add(value);
                }
            }, node.getConstructorArg());
            return builder.build();
        } catch (NoSuchFieldException e) {
            // Ignore if the field does not exist in this rule.
            return ImmutableSet.of();
        }
    }

    public static QueryTarget extractSourcePath(SourcePath sourcePath) {
        if (sourcePath instanceof PathSourcePath) {
            return QueryFileTarget.of(((PathSourcePath) sourcePath).getRelativePath());
        } else if (sourcePath instanceof BuildTargetSourcePath) {
            return QueryBuildTarget.of(((BuildTargetSourcePath) sourcePath).getTarget());
        }
        throw new HumanReadableException("Unsupported source path type: %s", sourcePath.getClass());
    }

    public static QueryTarget extractBuildTargetContainer(HasBuildTarget buildTargetContainer) {
        return QueryBuildTarget.of(buildTargetContainer.getBuildTarget());
    }
}