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// 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.skyframe;
import com.google.common.base.MoreObjects;
import com.google.common.collect.Iterators;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
/**
* Result of {@link EvaluableGraph#analyzeDepsDoneness}: Equivalent to an {@code
* Optional<Collection<SkyKey>>} but without the overhead of the wrapper {@code Optional}.
*/
public class DepsReport implements Collection<SkyKey> {
public static final DepsReport NO_INFORMATION = new DepsReport(-1, null);
private final int size;
/** Note that this array may have trailing null elements past {@link #size}. */
private final SkyKey[] arr;
private DepsReport(int size, SkyKey[] arr) {
this.size = size;
this.arr = arr;
}
boolean hasInformation() {
return arr != null;
}
@Override
public int size() {
return size;
}
@Override
public boolean isEmpty() {
return size == 0;
}
@Override
public Iterator<SkyKey> iterator() {
return Iterators.limit(Iterators.forArray(arr), size);
}
private UnsupportedOperationException throwUnsupported() {
throw new UnsupportedOperationException(this.toString());
}
@Override
public boolean contains(Object o) {
throw throwUnsupported();
}
@Override
public Object[] toArray() {
throw throwUnsupported();
}
@Override
public <T> T[] toArray(T[] a) {
throw throwUnsupported();
}
@Override
public boolean add(SkyKey skyKey) {
throw throwUnsupported();
}
@Override
public boolean remove(Object o) {
throw throwUnsupported();
}
@Override
public boolean containsAll(Collection<?> c) {
throw throwUnsupported();
}
@Override
public boolean addAll(Collection<? extends SkyKey> c) {
throw throwUnsupported();
}
@Override
public boolean removeAll(Collection<?> c) {
throw throwUnsupported();
}
@Override
public boolean retainAll(Collection<?> c) {
throw throwUnsupported();
}
@Override
public void clear() {
throw throwUnsupported();
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("size", size)
.add("arr", Arrays.toString(arr))
.toString();
}
/** Builder for {@link DepsReport}. */
public static class Builder {
private int size = 0;
private final SkyKey[] arr;
public Builder(int maxSize) {
arr = new SkyKey[maxSize];
}
public void add(SkyKey key) {
if (size >= arr.length) {
throw new IllegalStateException("Too many adds: " + key + ", " + this);
}
arr[size] = key;
size++;
}
public DepsReport build() {
return new DepsReport(size, arr);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("size", size)
.add("arr", Arrays.toString(arr))
.toString();
}
}
}
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