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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onosproject.store.consistent.impl;
import static com.google.common.base.MoreObjects.toStringHelper;
import java.util.Arrays;
import java.util.Objects;
import java.util.function.Function;
/**
* Utility class for checking matching values.
*
* @param <T> type of value
*/
public final class Match<T> {
private final boolean matchAny;
private final T value;
/**
* Returns a Match that matches any value.
* @param <T> match type
* @return new instance
*/
public static <T> Match<T> any() {
return new Match<>();
}
/**
* Returns a Match that matches null values.
* @param <T> match type
* @return new instance
*/
public static <T> Match<T> ifNull() {
return ifValue(null);
}
/**
* Returns a Match that matches only specified value.
* @param value value to match
* @param <T> match type
* @return new instance
*/
public static <T> Match<T> ifValue(T value) {
return new Match<>(value);
}
private Match() {
matchAny = true;
value = null;
}
private Match(T value) {
matchAny = false;
this.value = value;
}
/**
* Maps this instance to a Match of another type.
* @param mapper transformation function
* @param <V> new match type
* @return new instance
*/
public <V> Match<V> map(Function<T, V> mapper) {
if (matchAny) {
return any();
} else if (value == null) {
return ifNull();
} else {
return ifValue(mapper.apply(value));
}
}
/**
* Checks if this instance matches specified value.
* @param other other value
* @return true if matches; false otherwise
*/
public boolean matches(T other) {
if (matchAny) {
return true;
} else if (other == null) {
return value == null;
} else {
if (value instanceof byte[]) {
return Arrays.equals((byte[]) value, (byte[]) other);
}
return Objects.equals(value, other);
}
}
@Override
public int hashCode() {
return Objects.hash(matchAny, value);
}
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object other) {
if (!(other instanceof Match)) {
return false;
}
Match<T> that = (Match<T>) other;
return Objects.equals(this.matchAny, that.matchAny) &&
Objects.equals(this.value, that.value);
}
@Override
public String toString() {
return toStringHelper(this)
.add("matchAny", matchAny)
.add("value", value)
.toString();
}
}
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