Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
  /*
   * Copyright (C) 2007 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.collect;
 
 
 import java.util.List;
 
A list which forwards all its method calls to another list. Subclasses should override one or more methods to modify the behavior of the backing list as desired per the decorator pattern.

This class does not implement java.util.RandomAccess. If the delegate supports random access, the ForwardingList subclass should implement the RandomAccess interface.

Warning: The methods of ForwardingList forward indiscriminately to the methods of the delegate. For example, overriding ForwardingCollection.add(java.lang.Object) alone will not change the behavior of ForwardingCollection.addAll(java.util.Collection), which can lead to unexpected behavior. In this case, you should override addAll as well, either providing your own implementation, or delegating to the provided standardAddAll method.

The standard methods and any collection views they return are not guaranteed to be thread-safe, even when all of the methods that they depend on are thread-safe.

Author(s):
Mike Bostock
Louis Wasserman
Since:
2.0 (imported from Google Collections Library)
 
 public abstract class ForwardingList<E> extends ForwardingCollection<E>
     implements List<E> {
   // TODO(user): identify places where thread safety is actually lost
 
  
Constructor for use by subclasses.
 
   protected ForwardingList() {}
 
   @Override protected abstract List<E> delegate();
 
   @Override
   public void add(int index, E element) {
     delegate().add(indexelement);
   }
 
   @Override
   public boolean addAll(int indexCollection<? extends E> elements) {
     return delegate().addAll(indexelements);
   }
 
   @Override
   public E get(int index) {
     return delegate().get(index);
   }
 
   @Override
   public int indexOf(Object element) {
     return delegate().indexOf(element);
   }
 
   @Override
   public int lastIndexOf(Object element) {
     return delegate().lastIndexOf(element);
   }
 
   @Override
   public ListIterator<E> listIterator() {
     return delegate().listIterator();
   }
 
   @Override
   public ListIterator<E> listIterator(int index) {
     return delegate().listIterator(index);
   }
 
   @Override
  public E remove(int index) {
    return delegate().remove(index);
  }
  public E set(int index, E element) {
    return delegate().set(indexelement);
  }
  public List<E> subList(int fromIndexint toIndex) {
    return delegate().subList(fromIndextoIndex);
  }
  @Override public boolean equals(@Nullable Object object) {
    return object == this || delegate().equals(object);
  }
  @Override public int hashCode() {
    return delegate().hashCode();
  }

  
A sensible default implementation of ForwardingCollection.add(java.lang.Object), in terms of add(int,java.lang.Object). If you override add(int,java.lang.Object), you may wish to override ForwardingCollection.add(java.lang.Object) to forward to this implementation.

Since:
7.0
  protected boolean standardAdd(E element) {
    add(size(), element);
    return true;
  }

  
A sensible default implementation of addAll(int,java.util.Collection), in terms of the add method of listIterator(int). If you override listIterator(int), you may wish to override addAll(int,java.util.Collection) to forward to this implementation.

Since:
7.0
  protected boolean standardAddAll(
      int indexIterable<? extends E> elements) {
    return Lists.addAllImpl(thisindexelements);
  }

  
A sensible default implementation of indexOf(java.lang.Object), in terms of listIterator(). If you override listIterator(), you may wish to override indexOf(java.lang.Object) to forward to this implementation.

Since:
7.0
  protected int standardIndexOf(@Nullable Object element) {
    return Lists.indexOfImpl(thiselement);
  }

  
A sensible default implementation of lastIndexOf(java.lang.Object), in terms of listIterator(int). If you override listIterator(int), you may wish to override lastIndexOf(java.lang.Object) to forward to this implementation.

Since:
7.0
  protected int standardLastIndexOf(@Nullable Object element) {
    return Lists.lastIndexOfImpl(thiselement);
  }

  
A sensible default implementation of ForwardingCollection.iterator(), in terms of listIterator(). If you override listIterator(), you may wish to override ForwardingCollection.iterator() to forward to this implementation.

Since:
7.0
  protected Iterator<E> standardIterator() {
    return listIterator();
  }

  
A sensible default implementation of listIterator(), in terms of listIterator(int). If you override listIterator(int), you may wish to override listIterator() to forward to this implementation.

Since:
7.0
  protected ListIterator<E> standardListIterator() {
    return listIterator(0);
  }

  
A sensible default implementation of listIterator(int), in terms of ForwardingCollection.size(), get(int), set(int,java.lang.Object), add(int,java.lang.Object), and remove(int). If you override any of these methods, you may wish to override listIterator(int) to forward to this implementation.

Since:
7.0
  @Beta protected ListIterator<E> standardListIterator(int start) {
    return Lists.listIteratorImpl(thisstart);
  }

  
A sensible default implementation of subList(int,int). If you override any other methods, you may wish to override subList(int,int) to forward to this implementation.

Since:
7.0
  @Beta protected List<E> standardSubList(int fromIndexint toIndex) {
    return Lists.subListImpl(thisfromIndextoIndex);
  }

  
A sensible definition of equals(java.lang.Object) in terms of ForwardingCollection.size() and ForwardingCollection.iterator(). If you override either of those methods, you may wish to override equals(java.lang.Object) to forward to this implementation.

Since:
7.0
  @Beta protected boolean standardEquals(@Nullable Object object) {
    return Lists.equalsImpl(thisobject);
  }

  
A sensible definition of hashCode() in terms of ForwardingCollection.iterator(). If you override ForwardingCollection.iterator(), you may wish to override hashCode() to forward to this implementation.

Since:
7.0
  @Beta protected int standardHashCode() {
    return Lists.hashCodeImpl(this);
  }
New to GrepCode? Check out our FAQ X