com.google.devtools.build.android.DataSource.java Source code

Introduction

Here is the source code for com.google.devtools.build.android.DataSource.java

Source

// Copyright 2016 The Bazel Authors. 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.devtools.build.android;

import com.android.SdkConstants;
import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.android.proto.SerializeFormat.ProtoSource;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributeView;

/** Represents where the DataValue was derived from. */
public class DataSource implements Comparable<DataSource> {

    public static DataSource from(ProtoSource protoSource, FileSystem currentFileSystem) {
        Path path = currentFileSystem.getPath(protoSource.getFilename());
        return of(path);
    }

    public static DataSource of(Path sourcePath) {
        return new DataSource(sourcePath, ImmutableSet.<DataSource>of());
    }

    private final Path path;
    private final ImmutableSet<DataSource> overrides;

    private DataSource(Path path, ImmutableSet<DataSource> overrides) {
        this.path = path;
        this.overrides = overrides;
    }

    public Path getPath() {
        return path;
    }

    public long getFileSize() throws IOException {
        return Files.getFileAttributeView(path, BasicFileAttributeView.class).readAttributes().size();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        return Objects.equal(path, ((DataSource) o).path) && Objects.equal(overrides, ((DataSource) o).overrides);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(path, overrides);
    }

    @Override
    public int compareTo(DataSource o) {
        return path.compareTo(o.path);
    }

    public InputStream newBufferedInputStream() throws IOException {
        return new BufferedInputStream(Files.newInputStream(path));
    }

    /** Selects which DataSource should be considered the authoritative source of a value. */
    // TODO(corysmith): Combine the sources so that we know both of the originating libraries.
    // For now, prefer sources that have explicit definitions (values/ and not layout/), since the
    // values are ultimately written out to a merged values.xml. Sources from layout/menu, etc.
    // can come from "@+id" definitions.
    public DataSource combine(DataSource otherSource) {
        boolean thisInValuesFolder = isInValuesFolder();
        boolean otherInValuesFolder = otherSource.isInValuesFolder();
        if (thisInValuesFolder && !otherInValuesFolder) {
            return this;
        }
        if (!thisInValuesFolder && otherInValuesFolder) {
            return otherSource;
        }
        return this;
    }

    public DataSource overwrite(DataSource... sources) {
        ImmutableSet<DataSource> overrides = ImmutableSet.<DataSource>builder().addAll(this.overrides).add(sources)
                .build();
        Preconditions.checkArgument(!overrides.contains(this));
        return new DataSource(path, overrides);
    }

    public ImmutableSet<DataSource> overrides() {
        return overrides;
    }

    public boolean isInValuesFolder() {
        return path.getParent().getFileName().toString().startsWith(SdkConstants.FD_RES_VALUES);
    }

    public boolean hasOveridden(DataSource source) {
        return overrides.contains(source);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(getClass()).add("path", path).add("overrides", overrides).toString();
    }
}