Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.tang.implementation.java;
020
021import org.apache.reef.tang.implementation.InjectionPlan;
022import org.apache.reef.tang.types.Node;
023
024public final class JavaInstance<T> extends InjectionPlan<T> {
025  private final T instance;
026
027  public JavaInstance(final Node name, final T instance) {
028    super(name);
029    this.instance = instance;
030  }
031
032  @Override
033  public int getNumAlternatives() {
034    return instance == null ? 0 : 1;
035  }
036
037  @Override
038  public String toString() {
039    return getNode() + " = " + instance;
040  }
041
042  @Override
043  public boolean isAmbiguous() {
044    return false;
045  }
046
047  @Override
048  public boolean isInjectable() {
049    return instance != null;
050  }
051
052  public T getInstance() {
053    return instance;
054  }
055
056  public String getInstanceAsString() {
057    return instance.toString();
058  }
059
060  @Override
061  protected String toAmbiguousInjectString() {
062    throw new IllegalArgumentException("toAmbiguousInjectString called on JavaInstance!" + this.toString());
063  }
064
065  @Override
066  protected String toInfeasibleInjectString() {
067    return getNode() + " is not bound.";
068  }
069
070  @Override
071  protected boolean isInfeasibleLeaf() {
072    return true;
073  }
074
075  @Override
076  public String toShallowString() {
077    return toString();
078  }
079}