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/*
* Copyright 2016 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.turbine.binder.env;
import com.google.common.collect.ImmutableMap;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.turbine.binder.sym.Symbol;
import java.util.LinkedHashMap;
import java.util.Map;
import org.checkerframework.checker.nullness.qual.Nullable;
/** A simple {@link ImmutableMap}-backed {@link Env}. */
public class SimpleEnv<K extends Symbol, V> implements Env<K, V> {
private final ImmutableMap<K, V> map;
public SimpleEnv(ImmutableMap<K, V> map) {
this.map = map;
}
public static <K extends Symbol, V> Builder<K, V> builder() {
return new Builder<>();
}
public ImmutableMap<K, V> asMap() {
return map;
}
/** A builder for {@link SimpleEnv}static. */
public static class Builder<K extends Symbol, V> {
private final Map<K, V> map = new LinkedHashMap<>();
// TODO(cushon): audit the cases where this return value is being ignored
@CanIgnoreReturnValue
public @Nullable V put(K sym, V v) {
return map.put(sym, v);
}
public SimpleEnv<K, V> build() {
return new SimpleEnv<>(ImmutableMap.copyOf(map));
}
}
@Override
public @Nullable V get(K sym) {
return map.get(sym);
}
}
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