com.google.devtools.build.android.resources.FieldInitializers.java Source code

Introduction

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

Source

// Copyright 2017 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.resources;

import com.android.resources.ResourceType;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.Sets;
import java.util.Collection;
import java.util.EnumMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;

/**
 * Represents a collection of resource symbols and values suitable for writing java sources and
 * classes.
 */
public class FieldInitializers implements Iterable<Entry<ResourceType, Map<String, FieldInitializer>>> {

    private final Map<ResourceType, Map<String, FieldInitializer>> initializers;

    private FieldInitializers(Map<ResourceType, Map<String, FieldInitializer>> initializers) {
        this.initializers = initializers;
    }

    /** Creates a {@link FieldInitializers} copying the contents from a {@link Map}. */
    public static FieldInitializers copyOf(Map<ResourceType, Map<String, FieldInitializer>> initializers) {
        return new FieldInitializers(ImmutableMap.copyOf(initializers));
    }

    public static FieldInitializers mergedFrom(Collection<FieldInitializers> toMerge) {
        final Map<ResourceType, Map<String, FieldInitializer>> merged = new EnumMap<>(ResourceType.class);
        for (FieldInitializers mergee : toMerge) {
            for (Entry<ResourceType, Map<String, FieldInitializer>> entry : mergee) {
                final Map<String, FieldInitializer> fieldMap = merged.containsKey(entry.getKey())
                        ? merged.get(entry.getKey())
                        : new TreeMap<String, FieldInitializer>();
                merged.put(entry.getKey(), fieldMap);
                for (Entry<String, FieldInitializer> field : entry.getValue().entrySet()) {
                    fieldMap.put(field.getKey(), field.getValue());
                }
            }
        }
        return copyOf(merged);
    }

    public Iterable<Entry<ResourceType, Map<String, FieldInitializer>>> filter(FieldInitializers fieldsToWrite) {
        Map<ResourceType, Map<String, FieldInitializer>> initializersToWrite = new EnumMap<>(ResourceType.class);

        for (Entry<ResourceType, Map<String, FieldInitializer>> entry : fieldsToWrite.initializers.entrySet()) {
            if (initializers.containsKey(entry.getKey())) {
                final Map<String, FieldInitializer> valueFields = initializers.get(entry.getKey());
                final ImmutableMap.Builder<String, FieldInitializer> fields = ImmutableSortedMap.naturalOrder();
                // Resource type may be missing if resource overriding eliminates resources at the binary
                // level, which were originally present at the library level.
                for (String fieldName : Sets.intersection(entry.getValue().keySet(), valueFields.keySet())) {
                    fields.put(fieldName, valueFields.get(fieldName));
                }
                initializersToWrite.put(entry.getKey(), fields.build());
            }
        }

        return initializersToWrite.entrySet();
    }

    @Override
    public Iterator<Entry<ResourceType, Map<String, FieldInitializer>>> iterator() {
        return initializers.entrySet().iterator();
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(FieldInitializers.class).add("initializers", initializers).toString();
    }
}