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Diffstat (limited to 'guava/src/com/google/common/base/Present.java')
-rw-r--r-- | guava/src/com/google/common/base/Present.java | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/guava/src/com/google/common/base/Present.java b/guava/src/com/google/common/base/Present.java deleted file mode 100644 index bcde922..0000000 --- a/guava/src/com/google/common/base/Present.java +++ /dev/null @@ -1,92 +0,0 @@ -/* - * Copyright (C) 2011 The Guava Authors - * - * 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.common.base; - -import static com.google.common.base.Preconditions.checkNotNull; - -import com.google.common.annotations.GwtCompatible; - -import java.util.Collections; -import java.util.Set; - -import javax.annotation.Nullable; - -/** - * Implementation of an {@link Optional} containing a reference. - */ -@GwtCompatible -final class Present<T> extends Optional<T> { - private final T reference; - - Present(T reference) { - this.reference = reference; - } - - @Override public boolean isPresent() { - return true; - } - - @Override public T get() { - return reference; - } - - @Override public T or(T defaultValue) { - checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)"); - return reference; - } - - @Override public Optional<T> or(Optional<? extends T> secondChoice) { - checkNotNull(secondChoice); - return this; - } - - @Override public T or(Supplier<? extends T> supplier) { - checkNotNull(supplier); - return reference; - } - - @Override public T orNull() { - return reference; - } - - @Override public Set<T> asSet() { - return Collections.singleton(reference); - } - - @Override public <V> Optional<V> transform(Function<? super T, V> function) { - return new Present<V>(checkNotNull(function.apply(reference), - "the Function passed to Optional.transform() must not return null.")); - } - - @Override public boolean equals(@Nullable Object object) { - if (object instanceof Present) { - Present<?> other = (Present<?>) object; - return reference.equals(other.reference); - } - return false; - } - - @Override public int hashCode() { - return 0x598df91c + reference.hashCode(); - } - - @Override public String toString() { - return "Optional.of(" + reference + ")"; - } - - private static final long serialVersionUID = 0; -} |