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/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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.elasticsearch.common.inject.spi;

import org.elasticsearch.common.inject.Key;

import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

import static java.util.Collections.unmodifiableSet;

/**
 * A variable that can be resolved by an injector.
 * 

* Use {@link #get} to build a freestanding dependency, or {@link InjectionPoint} to build one * that's attached to a constructor, method or field. * * @author [email protected] (Bob Lee) * @author [email protected] (Jesse Wilson) * @since 2.0 */ public final class Dependency { private final InjectionPoint injectionPoint; private final Key key; private final boolean nullable; private final int parameterIndex; Dependency(InjectionPoint injectionPoint, Key key, boolean nullable, int parameterIndex) { this.injectionPoint = injectionPoint; this.key = key; this.nullable = nullable; this.parameterIndex = parameterIndex; } /** * Returns a new dependency that is not attached to an injection point. The returned dependency is * nullable. */ public static Dependency get(Key key) { return new Dependency<>(null, key, true, -1); } /** * Returns the dependencies from the given injection points. */ public static Set> forInjectionPoints(Set injectionPoints) { Set> dependencies = new HashSet<>(); for (InjectionPoint injectionPoint : injectionPoints) { dependencies.addAll(injectionPoint.getDependencies()); } return unmodifiableSet(dependencies); } /** * Returns the key to the binding that satisfies this dependency. */ public Key getKey() { return this.key; } /** * Returns true if null is a legal value for this dependency. */ public boolean isNullable() { return nullable; } /** * Returns the injection point to which this dependency belongs, or null if this dependency isn't * attached to a particular injection point. */ public InjectionPoint getInjectionPoint() { return injectionPoint; } /** * Returns the index of this dependency in the injection point's parameter list, or {@code -1} if * this dependency does not belong to a parameter list. Only method and constructor dependencies * are elements in a parameter list. */ public int getParameterIndex() { return parameterIndex; } @Override public int hashCode() { return Objects.hash(injectionPoint, parameterIndex, key); } @Override public boolean equals(Object o) { if (o instanceof Dependency) { Dependency dependency = (Dependency) o; return Objects.equals(injectionPoint, dependency.injectionPoint) && Objects.equals(parameterIndex, dependency.parameterIndex) && Objects.equals(key, dependency.key); } else { return false; } } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append(key); if (injectionPoint != null) { builder.append("@").append(injectionPoint); if (parameterIndex != -1) { builder.append("[").append(parameterIndex).append("]"); } } return builder.toString(); } }





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