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[commit-cp] classpath external/jsr166/java/util/concurrentS... [generics
|
From: |
Tom Tromey |
|
Subject: |
[commit-cp] classpath external/jsr166/java/util/concurrentS... [generics-branch] |
|
Date: |
Fri, 16 Jun 2006 17:39:15 +0000 |
CVSROOT: /cvsroot/classpath
Module name: classpath
Branch: generics-branch
Changes by: Tom Tromey <tromey> 06/06/16 17:39:14
Modified files:
external/jsr166/java/util/concurrent:
ScheduledThreadPoolExecutor.java
external/jsr166/java/util: ArrayDeque.java
. : .classpath ChangeLog
Added files:
java/util/concurrent: CopyOnWriteArrayList.java
Removed files:
java/util : Queue.java AbstractQueue.java
Log message:
Imported JSR 166 reference implementation:
* .classpath: Added external/jsr166.
* java/util/concurrent/CopyOnWriteArrayList.java: New file.
* java/util/AbstractQueue.java: Removed.
* java/util/Queue.java: Removed.
*
external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java
(runPeriodic): Added explicit cast.
* external/jsr166/java/util/ArrayDeque.java (clone): Use
elements.clone.
CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/classpath/external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java?cvsroot=classpath&only_with_tag=generics-branch&r1=1.1.1.1&r2=1.1.1.1.2.1
http://cvs.savannah.gnu.org/viewcvs/classpath/java/util/Queue.java?cvsroot=classpath&only_with_tag=generics-branch&r1=1.1.2.2&r2=0
http://cvs.savannah.gnu.org/viewcvs/classpath/java/util/AbstractQueue.java?cvsroot=classpath&only_with_tag=generics-branch&r1=1.1.2.4&r2=0
http://cvs.savannah.gnu.org/viewcvs/classpath/external/jsr166/java/util/ArrayDeque.java?cvsroot=classpath&only_with_tag=generics-branch&r1=1.1.1.1&r2=1.1.1.1.2.1
http://cvs.savannah.gnu.org/viewcvs/classpath/.classpath?cvsroot=classpath&only_with_tag=generics-branch&r1=1.1.2.6&r2=1.1.2.7
http://cvs.savannah.gnu.org/viewcvs/classpath/ChangeLog?cvsroot=classpath&only_with_tag=generics-branch&r1=1.2386.2.270&r2=1.2386.2.271
http://cvs.savannah.gnu.org/viewcvs/classpath/java/util/concurrent/CopyOnWriteArrayList.java?cvsroot=classpath&only_with_tag=generics-branch&rev=1.1.2.1
Patches:
Index: external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java
===================================================================
RCS file:
/cvsroot/classpath/classpath/external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java,v
retrieving revision 1.1.1.1
retrieving revision 1.1.1.1.2.1
diff -u -b -r1.1.1.1 -r1.1.1.1.2.1
--- external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java
16 Jun 2006 16:38:17 -0000 1.1.1.1
+++ external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java
16 Jun 2006 17:39:11 -0000 1.1.1.1.2.1
@@ -188,7 +188,10 @@
time += p;
else
time = now() - p;
- ScheduledThreadPoolExecutor.super.getQueue().add(this);
+ // Classpath local: ecj from eclipse 3.1 does not
+ // compile this.
+ // ScheduledThreadPoolExecutor.super.getQueue().add(this);
+ ScheduledThreadPoolExecutor.super.getQueue().add((Runnable)
this);
}
// This might have been the final executed delayed
// task. Wake up threads to check.
Index: external/jsr166/java/util/ArrayDeque.java
===================================================================
RCS file:
/cvsroot/classpath/classpath/external/jsr166/java/util/ArrayDeque.java,v
retrieving revision 1.1.1.1
retrieving revision 1.1.1.1.2.1
diff -u -b -r1.1.1.1 -r1.1.1.1.2.1
--- external/jsr166/java/util/ArrayDeque.java 16 Jun 2006 16:38:17 -0000
1.1.1.1
+++ external/jsr166/java/util/ArrayDeque.java 16 Jun 2006 17:39:11 -0000
1.1.1.1.2.1
@@ -785,7 +785,9 @@
public ArrayDeque<E> clone() {
try {
ArrayDeque<E> result = (ArrayDeque<E>) super.clone();
- result.elements = Arrays.copyOf(elements, elements.length);
+ // Classpath local: we don't have Arrays.copyOf yet.
+ // result.elements = Arrays.copyOf(elements, elements.length);
+ result.elements = elements.clone();
return result;
} catch (CloneNotSupportedException e) {
Index: .classpath
===================================================================
RCS file: /cvsroot/classpath/classpath/.classpath,v
retrieving revision 1.1.2.6
retrieving revision 1.1.2.7
diff -u -b -r1.1.2.6 -r1.1.2.7
--- .classpath 26 Mar 2006 20:08:09 -0000 1.1.2.6
+++ .classpath 16 Jun 2006 17:39:11 -0000 1.1.2.7
@@ -1,7 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
- <classpathentry
excluding=".externalToolBuilders/|.settings/|ChangeLog*|Makefile*|autom4te.cache/|compat/|config*|doc/|examples/|external/|external/relaxngDatatype/|include/|install/|lib/|m4/|native/|resource/|scripts/|test/|testsuite/|tools/|vm/reference/"
kind="src" path=""/>
+ <classpathentry
excluding=".externalToolBuilders/|.settings/|ChangeLog*|Makefile*|autom4te.cache/|compat/|config*|doc/|examples/|external/|external/relaxngDatatype/|include/|install/|jessie-tests/|lib/|m4/|native/|resource/|scripts/|test/|testsuite/|tools/|vm/reference/"
kind="src" path=""/>
<classpathentry
excluding=".cvsignore|Makefile|Makefile.am|Makefile.in|README.txt" kind="src"
path="external/relaxngDatatype"/>
+ <classpathentry kind="src" path="external/jsr166"/>
<classpathentry
excluding=".cvsignore|Makefile|Makefile.am|Makefile.in|README" kind="src"
path="tools"/>
<classpathentry excluding=".cvsignore|Makefile|Makefile.am|Makefile.in"
kind="src" path="resource"/>
<classpathentry excluding=".cvsignore|Makefile.am" kind="src"
path="vm/reference"/>
Index: ChangeLog
===================================================================
RCS file: /cvsroot/classpath/classpath/ChangeLog,v
retrieving revision 1.2386.2.270
retrieving revision 1.2386.2.271
diff -u -b -r1.2386.2.270 -r1.2386.2.271
--- ChangeLog 16 Jun 2006 16:16:13 -0000 1.2386.2.270
+++ ChangeLog 16 Jun 2006 17:39:11 -0000 1.2386.2.271
@@ -1,5 +1,17 @@
2006-06-16 Tom Tromey <address@hidden>
+ Imported JSR 166 reference implementation:
+ * .classpath: Added external/jsr166.
+ * java/util/concurrent/CopyOnWriteArrayList.java: New file.
+ * java/util/AbstractQueue.java: Removed.
+ * java/util/Queue.java: Removed.
+ * external/jsr166/java/util/concurrent/ScheduledThreadPoolExecutor.java
+ (runPeriodic): Added explicit cast.
+ * external/jsr166/java/util/ArrayDeque.java (clone): Use
+ elements.clone.
+
+2006-06-16 Tom Tromey <address@hidden>
+
* vm/reference/sun/reflect/Reflection.java (verifyMemberAccess):
Removed.
(getCallerClass): Now static.
Index: java/util/concurrent/CopyOnWriteArrayList.java
===================================================================
RCS file: java/util/concurrent/CopyOnWriteArrayList.java
diff -N java/util/concurrent/CopyOnWriteArrayList.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ java/util/concurrent/CopyOnWriteArrayList.java 16 Jun 2006 17:39:13
-0000 1.1.2.1
@@ -0,0 +1,438 @@
+/* CopyOnWriteArrayList.java
+ Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.util.concurrent;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.lang.reflect.Array;
+import java.util.AbstractList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.RandomAccess;
+
+/** @since 1.5 */
+public class CopyOnWriteArrayList<E> extends AbstractList<E> implements
+ List<E>, RandomAccess, Cloneable, Serializable
+{
+ /**
+ * Where the data is stored.
+ */
+ private transient E[] data;
+
+ /**
+ * Construct a new ArrayList with the default capacity (16).
+ */
+ public CopyOnWriteArrayList()
+ {
+ data = (E[]) new Object[0];
+ }
+
+ /**
+ * Construct a new ArrayList, and initialize it with the elements in the
+ * supplied Collection. The initial capacity is 110% of the Collection's
size.
+ *
+ * @param c
+ * the collection whose elements will initialize this list
+ * @throws NullPointerException
+ * if c is null
+ */
+ public CopyOnWriteArrayList(Collection< ? extends E> c)
+ {
+ // FIXME ... correct? use c.toArray()
+ data = (E[]) new Object[c.size()];
+ int index = 0;
+ for (E value : c)
+ data[index++] = value;
+ }
+
+ /**
+ * Returns the number of elements in this list.
+ *
+ * @return the list size
+ */
+ public int size()
+ {
+ return data.length;
+ }
+
+ /**
+ * Checks if the list is empty.
+ *
+ * @return true if there are no elements
+ */
+ public boolean isEmpty()
+ {
+ return data.length == 0;
+ }
+
+ /**
+ * Returns true iff element is in this ArrayList.
+ *
+ * @param e
+ * the element whose inclusion in the List is being tested
+ * @return true if the list contains e
+ */
+ public boolean contains(Object e)
+ {
+ return indexOf(e) != -1;
+ }
+
+ /**
+ * Returns the lowest index at which element appears in this List, or -1 if
it
+ * does not appear.
+ *
+ * @param e
+ * the element whose inclusion in the List is being tested
+ * @return the index where e was found
+ */
+ public int indexOf(Object e)
+ {
+ E[] data = this.data;
+ for (int i = 0; i < data.length; i++)
+ if (equals(e, data[i]))
+ return i;
+ return -1;
+ }
+
+ /**
+ * Returns the highest index at which element appears in this List, or -1 if
+ * it does not appear.
+ *
+ * @param e
+ * the element whose inclusion in the List is being tested
+ * @return the index where e was found
+ */
+ public int lastIndexOf(Object e)
+ {
+ E[] data = this.data;
+ for (int i = data.length - 1; i >= 0; i--)
+ if (equals(e, data[i]))
+ return i;
+ return -1;
+ }
+
+ /**
+ * Creates a shallow copy of this ArrayList (elements are not cloned).
+ *
+ * @return the cloned object
+ */
+ public Object clone()
+ {
+ CopyOnWriteArrayList<E> clone = null;
+ try
+ {
+ clone = (CopyOnWriteArrayList<E>) super.clone();
+ clone.data = (E[]) data.clone();
+ }
+ catch (CloneNotSupportedException e)
+ {
+ // Impossible to get here.
+ }
+ return clone;
+ }
+
+ /**
+ * Returns an Object array containing all of the elements in this ArrayList.
+ * The array is independent of this list.
+ *
+ * @return an array representation of this list
+ */
+ public Object[] toArray()
+ {
+ E[] data = this.data;
+ E[] array = (E[]) new Object[data.length];
+ System.arraycopy(data, 0, array, 0, data.length);
+ return array;
+ }
+
+ /**
+ * Returns an Array whose component type is the runtime component type of the
+ * passed-in Array. The returned Array is populated with all of the elements
+ * in this ArrayList. If the passed-in Array is not large enough to store all
+ * of the elements in this List, a new Array will be created and returned; if
+ * the passed-in Array is <i>larger</i> than the size of this List, then
+ * size() index will be set to null.
+ *
+ * @param a
+ * the passed-in Array
+ * @return an array representation of this list
+ * @throws ArrayStoreException
+ * if the runtime type of a does not allow an element in this list
+ * @throws NullPointerException
+ * if a is null
+ */
+ public <T> T[] toArray(T[] a)
+ {
+ E[] data = this.data;
+ if (a.length < data.length)
+ a = (T[]) Array.newInstance(a.getClass().getComponentType(),
data.length);
+ else if (a.length > data.length)
+ a[data.length] = null;
+ System.arraycopy(data, 0, a, 0, data.length);
+ return a;
+ }
+
+ /**
+ * Retrieves the element at the user-supplied index.
+ *
+ * @param index
+ * the index of the element we are fetching
+ * @throws IndexOutOfBoundsException
+ * if index < 0 || index >= size()
+ */
+ public E get(int index)
+ {
+ return data[index];
+ }
+
+ /**
+ * Sets the element at the specified index. The new element, e, can be an
+ * object of any type or null.
+ *
+ * @param index
+ * the index at which the element is being set
+ * @param e
+ * the element to be set
+ * @return the element previously at the specified index
+ * @throws IndexOutOfBoundsException
+ * if index < 0 || index >= 0
+ */
+ public synchronized E set(int index, E e)
+ {
+ E result = data[index];
+ E[] newData = data.clone();
+ newData[index] = e;
+ data = newData;
+ return result;
+ }
+
+ /**
+ * Appends the supplied element to the end of this list. The element, e, can
+ * be an object of any type or null.
+ *
+ * @param e
+ * the element to be appended to this list
+ * @return true, the add will always succeed
+ */
+ public synchronized boolean add(E e)
+ {
+ E[] data = this.data;
+ E[] newData = (E[]) new Object[data.length];
+ System.arraycopy(data, 0, newData, 0, data.length);
+ newData[data.length] = e;
+ this.data = newData;
+ return true;
+ }
+
+ /**
+ * Adds the supplied element at the specified index, shifting all elements
+ * currently at that index or higher one to the right. The element, e, can be
+ * an object of any type or null.
+ *
+ * @param index
+ * the index at which the element is being added
+ * @param e
+ * the item being added
+ * @throws IndexOutOfBoundsException
+ * if index < 0 || index > size()
+ */
+ public synchronized void add(int index, E e)
+ {
+ E[] data = this.data;
+ E[] newData = (E[]) new Object[data.length];
+ System.arraycopy(data, 0, newData, 0, index);
+ newData[index] = e;
+ System.arraycopy(data, index, newData, index + 1, data.length - index);
+ this.data = newData;
+ }
+
+ /**
+ * Removes the element at the user-supplied index.
+ *
+ * @param index
+ * the index of the element to be removed
+ * @return the removed Object
+ * @throws IndexOutOfBoundsException
+ * if index < 0 || index >= size()
+ */
+ public synchronized E remove(int index)
+ {
+ E[] data = this.data;
+ E[] newData = (E[]) new Object[data.length - 1];
+ System.arraycopy(data, 0, newData, 0, index - 1);
+ System.arraycopy(data, index + 1, newData, index,
+ data.length - index - 1);
+ E r = data[index];
+ this.data = newData;
+ return r;
+ }
+
+ /**
+ * Removes all elements from this List
+ */
+ public synchronized void clear()
+ {
+ data = (E[]) new Object[0];
+ }
+
+ /**
+ * Add each element in the supplied Collection to this List. It is undefined
+ * what happens if you modify the list while this is taking place; for
+ * example, if the collection contains this list. c can contain objects of
any
+ * type, as well as null values.
+ *
+ * @param c
+ * a Collection containing elements to be added to this List
+ * @return true if the list was modified, in other words c is not empty
+ * @throws NullPointerException
+ * if c is null
+ */
+ public synchronized boolean addAll(Collection< ? extends E> c)
+ {
+ return addAll(data.length, c);
+ }
+
+ /**
+ * Add all elements in the supplied collection, inserting them beginning at
+ * the specified index. c can contain objects of any type, as well as null
+ * values.
+ *
+ * @param index
+ * the index at which the elements will be inserted
+ * @param c
+ * the Collection containing the elements to be inserted
+ * @throws IndexOutOfBoundsException
+ * if index < 0 || index > 0
+ * @throws NullPointerException
+ * if c is null
+ */
+ public synchronized boolean addAll(int index, Collection< ? extends E> c)
+ {
+ E[] data = this.data;
+ Iterator<? extends E> itr = c.iterator();
+ int csize = c.size();
+ if (csize == 0)
+ return false;
+
+ E[] newData = (E[]) new Object[data.length + csize];
+ System.arraycopy(data, 0, newData, 0, data.length);
+ int end = data.length;
+ for (E value : c)
+ newData[end++] = value;
+ this.data = newData;
+ return true;
+ }
+
+ public synchronized boolean addIfAbsent(E val)
+ {
+ if (contains(val))
+ return false;
+ add(val);
+ return true;
+ }
+
+ public synchronized int addAllAbsent(Collection<? extends E> c)
+ {
+ int result = 0;
+ for (E val : c)
+ {
+ if (addIfAbsent(val))
+ ++result;
+ }
+ return result;
+ }
+
+ /**
+ * Serializes this object to the given stream.
+ *
+ * @param s
+ * the stream to write to
+ * @throws IOException
+ * if the underlying stream fails
+ * @serialData the size field (int), the length of the backing array (int),
+ * followed by its elements (Objects) in proper order.
+ */
+ private void writeObject(ObjectOutputStream s) throws IOException
+ {
+ // The 'size' field.
+ s.defaultWriteObject();
+ // We serialize unused list entries to preserve capacity.
+ int len = data.length;
+ s.writeInt(len);
+ // it would be more efficient to just write "size" items,
+ // this need readObject read "size" items too.
+ for (int i = 0; i < data.length; i++)
+ s.writeObject(data[i]);
+ }
+
+ /**
+ * Deserializes this object from the given stream.
+ *
+ * @param s
+ * the stream to read from
+ * @throws ClassNotFoundException
+ * if the underlying stream fails
+ * @throws IOException
+ * if the underlying stream fails
+ * @serialData the size field (int), the length of the backing array (int),
+ * followed by its elements (Objects) in proper order.
+ */
+ private void readObject(ObjectInputStream s) throws IOException,
+ ClassNotFoundException
+ {
+ // the `size' field.
+ s.defaultReadObject();
+ int capacity = s.readInt();
+ data = (E[]) new Object[capacity];
+ for (int i = 0; i < capacity; i++)
+ data[i] = (E) s.readObject();
+ }
+
+ static final boolean equals(Object o1, Object o2)
+ {
+ return o1 == null ? o2 == null : o1.equals(o2);
+ }
+
+ Object[] getArray()
+ {
+ return data;
+ }
+}
Index: java/util/Queue.java
===================================================================
RCS file: java/util/Queue.java
diff -N java/util/Queue.java
--- java/util/Queue.java 21 Sep 2005 21:32:40 -0000 1.1.2.2
+++ /dev/null 1 Jan 1970 00:00:00 -0000
@@ -1,51 +0,0 @@
-/* Queue.java -- Interface that represents a queue
- Copyright (C) 2004 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.util;
-
-/**
- * @since 1.5
- */
-public interface Queue<T> extends Collection<T>
-{
- T element();
- boolean offer(T value);
- T peek();
- T poll();
- T remove();
-}
Index: java/util/AbstractQueue.java
===================================================================
RCS file: java/util/AbstractQueue.java
diff -N java/util/AbstractQueue.java
--- java/util/AbstractQueue.java 21 Sep 2005 21:32:39 -0000 1.1.2.4
+++ /dev/null 1 Jan 1970 00:00:00 -0000
@@ -1,94 +0,0 @@
-/* AbstractQueue.java -- Implementation of some Queue methods
- Copyright (C) 2004, 2005 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.util;
-
-/**
- * @author Tom Tromey (address@hidden)
- * @author Andrew John Hughes (address@hidden)
- * @since 1.5
- */
-public abstract class AbstractQueue<E> extends AbstractCollection<E>
- implements Queue<E>
-{
- protected AbstractQueue()
- {
- }
-
- public boolean add(E value)
- {
- if (offer(value))
- return true;
- throw new IllegalStateException();
- }
-
- public boolean addAll(Collection<? extends E> c)
- {
- if (c == this)
- throw new IllegalArgumentException();
- boolean result = false;
- for (E val : c)
- {
- if (add(val))
- result = true;
- }
- return result;
- }
-
- public void clear()
- {
- while (poll() != null)
- ;
- }
-
- public E element()
- {
- E result = peek();
- if (result == null)
- throw new NoSuchElementException();
- return result;
- }
-
- public E remove()
- {
- E result = poll();
- if (result == null)
- throw new NoSuchElementException();
- return result;
- }
-}
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