jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/List.java@9a66ca7c79fa (annotated)

src/share/classes/com/sun/tools/javac/util/List.java@9a66ca7c79fa (annotated)

src/share/classes/com/sun/tools/javac/util/List.java

Sat, 01 Dec 2007 00:00:00 +0000

author: duke
date: Sat, 01 Dec 2007 00:00:00 +0000
changeset 1: 9a66ca7c79fa
child 184: 905e151a185a
permissions: -rw-r--r--

Initial load

 /*
  * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Sun designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Sun in the LICENSE file that accompanied this code.
  *
  * This code 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
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  */
 package com.sun.tools.javac.util;
 import java.lang.reflect.Array;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.AbstractCollection;
 import java.util.ListIterator;
 import java.util.NoSuchElementException;
 /** A class for generic linked lists. Links are supposed to be
  *  immutable, the only exception being the incremental construction of
  *  lists via ListBuffers.  List is the main container class in
  *  GJC. Most data structures and algorthms in GJC use lists rather
  *  than arrays.
  *
  *  <p>Lists are always trailed by a sentinel element, whose head and tail
  *  are both null.
  *
  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
  *  you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class List<A> extends AbstractCollection<A> implements java.util.List<A> {
     /** The first element of the list, supposed to be immutable.
      */
     public A head;
     /** The remainder of the list except for its first element, supposed
      *  to be immutable.
      */
     //@Deprecated
     public List<A> tail;
     /** Construct a list given its head and tail.
      */
     List(A head, List<A> tail) {
         this.tail = tail;
         this.head = head;
     }
     /** Construct an empty list.
      */
     @SuppressWarnings("unchecked")
     public static <A> List<A> nil() {
         return EMPTY_LIST;
     }
     private static List EMPTY_LIST = new List<Object>(null,null) {
         public List<Object> setTail(List<Object> tail) {
             throw new UnsupportedOperationException();
         }
         public boolean isEmpty() {
             return true;
         }
     };
     /** Construct a list consisting of given element.
      */
     public static <A> List<A> of(A x1) {
         return new List<A>(x1, List.<A>nil());
     }
     /** Construct a list consisting of given elements.
      */
     public static <A> List<A> of(A x1, A x2) {
         return new List<A>(x1, of(x2));
     }
     /** Construct a list consisting of given elements.
      */
     public static <A> List<A> of(A x1, A x2, A x3) {
         return new List<A>(x1, of(x2, x3));
     }
     /** Construct a list consisting of given elements.
      */
     public static <A> List<A> of(A x1, A x2, A x3, A... rest) {
         return new List<A>(x1, new List<A>(x2, new List<A>(x3, from(rest))));
     }
     /**
      * Construct a list consisting all elements of given array.
      * @param array an array; if {@code null} return an empty list
      */
     public static <A> List<A> from(A[] array) {
         List<A> xs = nil();
         if (array != null)
             for (int i = array.length - 1; i >= 0; i--)
                 xs = new List<A>(array[i], xs);
         return xs;
     }
     /** Construct a list consisting of a given number of identical elements.
      *  @param len    The number of elements in the list.
      *  @param init   The value of each element.
      */
     @Deprecated
     public static <A> List<A> fill(int len, A init) {
         List<A> l = nil();
         for (int i = 0; i < len; i++) l = new List<A>(init, l);
         return l;
     }
     /** Does list have no elements?
      */
     @Override
     public boolean isEmpty() {
         return tail == null;
     }
     /** Does list have elements?
      */
     //@Deprecated
     public boolean nonEmpty() {
         return tail != null;
     }
     /** Return the number of elements in this list.
      */
     //@Deprecated
     public int length() {
         List<A> l = this;
         int len = 0;
         while (l.tail != null) {
             l = l.tail;
             len++;
         }
         return len;
     }
     @Override
     public int size() {
         return length();
     }
     public List<A> setTail(List<A> tail) {
         this.tail = tail;
         return tail;
     }
     /** Prepend given element to front of list, forming and returning
      *  a new list.
      */
     public List<A> prepend(A x) {
         return new List<A>(x, this);
     }
     /** Prepend given list of elements to front of list, forming and returning
      *  a new list.
      */
     public List<A> prependList(List<A> xs) {
         if (this.isEmpty()) return xs;
         if (xs.isEmpty()) return this;
         if (xs.tail.isEmpty()) return prepend(xs.head);
         // return this.prependList(xs.tail).prepend(xs.head);
         List<A> result = this;
         List<A> rev = xs.reverse();
         assert rev != xs;
         // since xs.reverse() returned a new list, we can reuse the
         // individual List objects, instead of allocating new ones.
         while (rev.nonEmpty()) {
             List<A> h = rev;
             rev = rev.tail;
             h.setTail(result);
             result = h;
         }
         return result;
     }
     /** Reverse list.
      * If the list is empty or a singleton, then the same list is returned.
      * Otherwise a new list is formed.
      */
     public List<A> reverse() {
         // if it is empty or a singleton, return itself
         if (isEmpty() || tail.isEmpty())
             return this;
         List<A> rev = nil();
         for (List<A> l = this; l.nonEmpty(); l = l.tail)
             rev = new List<A>(l.head, rev);
         return rev;
     }
     /** Append given element at length, forming and returning
      *  a new list.
      */
     public List<A> append(A x) {
         return of(x).prependList(this);
     }
     /** Append given list at length, forming and returning
      *  a new list.
      */
     public List<A> appendList(List<A> x) {
         return x.prependList(this);
     }
     /**
      * Append given list buffer at length, forming and returning a new
      * list.
      */
     public List<A> appendList(ListBuffer<A> x) {
         return appendList(x.toList());
     }
     /** Copy successive elements of this list into given vector until
      *  list is exhausted or end of vector is reached.
      */
     @Override @SuppressWarnings("unchecked")
     public <T> T[] toArray(T[] vec) {
         int i = 0;
         List<A> l = this;
         Object[] dest = vec;
         while (l.nonEmpty() && i < vec.length) {
             dest[i] = l.head;
             l = l.tail;
             i++;
         }
         if (l.isEmpty()) {
             if (i < vec.length)
                 vec[i] = null;
             return vec;
         }
         vec = (T[])Array.newInstance(vec.getClass().getComponentType(), size());
         return toArray(vec);
     }
     public Object[] toArray() {
         return toArray(new Object[size()]);
     }
     /** Form a string listing all elements with given separator character.
      */
     public String toString(String sep) {
         if (isEmpty()) {
             return "";
         } else {
             StringBuffer buf = new StringBuffer();
             buf.append(head);
             for (List<A> l = tail; l.nonEmpty(); l = l.tail) {
                 buf.append(sep);
                 buf.append(l.head);
             }
             return buf.toString();
         }
     }
     /** Form a string listing all elements with comma as the separator character.
      */
     @Override
     public String toString() {
         return toString(",");
     }
     /** Compute a hash code, overrides Object
      *  @see java.util.List#hashCode
      */
     @Override
     public int hashCode() {
         List<A> l = this;
         int h = 1;
         while (l.tail != null) {
             h = h * 31 + (l.head == null ? 0 : l.head.hashCode());
             l = l.tail;
         }
         return h;
     }
     /** Is this list the same as other list?
      *  @see java.util.List#equals
      */
     @Override
     public boolean equals(Object other) {
         if (other instanceof List<?>)
             return equals(this, (List<?>)other);
         if (other instanceof java.util.List<?>) {
             List<A> t = this;
             Iterator<?> oIter = ((java.util.List<?>) other).iterator();
             while (t.tail != null && oIter.hasNext()) {
                 Object o = oIter.next();
                 if ( !(t.head == null ? o == null : t.head.equals(o)))
                     return false;
                 t = t.tail;
             }
             return (t.isEmpty() && !oIter.hasNext());
         }
         return false;
     }
     /** Are the two lists the same?
      */
     public static boolean equals(List xs, List ys) {
         while (xs.tail != null && ys.tail != null) {
             if (xs.head == null) {
                 if (ys.head != null) return false;
             } else {
                 if (!xs.head.equals(ys.head)) return false;
             }
             xs = xs.tail;
             ys = ys.tail;
         }
         return xs.tail == null && ys.tail == null;
     }
     /** Does the list contain the specified element?
      */
     @Override
     public boolean contains(Object x) {
         List<A> l = this;
         while (l.tail != null) {
             if (x == null) {
                 if (l.head == null) return true;
             } else {
                 if (l.head.equals(x)) return true;
             }
             l = l.tail;
         }
         return false;
     }
     /** The last element in the list, if any, or null.
      */
     public A last() {
         A last = null;
         List<A> t = this;
         while (t.tail != null) {
             last = t.head;
             t = t.tail;
         }
         return last;
     }
     @SuppressWarnings("unchecked")
     public static <T> List<T> convert(Class<T> klass, List<?> list) {
         if (list == null)
             return null;
         for (Object o : list)
             klass.cast(o);
         return (List<T>)list;
     }
     private static Iterator EMPTYITERATOR = new Iterator() {
             public boolean hasNext() {
                 return false;
             }
             public Object next() {
                 throw new java.util.NoSuchElementException();
             }
             public void remove() {
                 throw new UnsupportedOperationException();
             }
         };
     @SuppressWarnings("unchecked")
     private static <A> Iterator<A> emptyIterator() {
         return EMPTYITERATOR;
     }
     @Override
     public Iterator<A> iterator() {
         if (tail == null)
             return emptyIterator();
         return new Iterator<A>() {
             List<A> elems = List.this;
             public boolean hasNext() {
                 return elems.tail != null;
             }
             public A next() {
                 if (elems.tail == null)
                     throw new NoSuchElementException();
                 A result = elems.head;
                 elems = elems.tail;
                 return result;
             }
             public void remove() {
                 throw new UnsupportedOperationException();
             }
         };
     }
     public A get(int index) {
         if (index < 0)
             throw new IndexOutOfBoundsException(String.valueOf(index));
         List<A> l = this;
         for (int i = index; i-- > 0 && !l.isEmpty(); l = l.tail)
             ;
         if (l.isEmpty())
             throw new IndexOutOfBoundsException("Index: " + index + ", " +
                                                 "Size: " + size());
         return l.head;
     }
     public boolean addAll(int index, Collection<? extends A> c) {
         if (c.isEmpty())
             return false;
         throw new UnsupportedOperationException();
     }
     public A set(int index, A element) {
         throw new UnsupportedOperationException();
     }
     public void add(int index, A element) {
         throw new UnsupportedOperationException();
     }
     public A remove(int index) {
         throw new UnsupportedOperationException();
     }
     public int indexOf(Object o) {
         int i = 0;
         for (List<A> l = this; l.tail != null; l = l.tail, i++) {
             if (l.head == null ? o == null : l.head.equals(o))
                 return i;
         }
         return -1;
     }
     public int lastIndexOf(Object o) {
         int last = -1;
         int i = 0;
         for (List<A> l = this; l.tail != null; l = l.tail, i++) {
             if (l.head == null ? o == null : l.head.equals(o))
                 last = i;
         }
         return last;
     }
     public ListIterator<A> listIterator() {
         return Collections.unmodifiableList(new ArrayList<A>(this)).listIterator();
     }
     public ListIterator<A> listIterator(int index) {
         return Collections.unmodifiableList(new ArrayList<A>(this)).listIterator(index);
     }
     public java.util.List<A> subList(int fromIndex, int toIndex) {
         if  (fromIndex < 0 || toIndex > size() || fromIndex > toIndex)
             throw new IllegalArgumentException();
         ArrayList<A> a = new ArrayList<A>(toIndex - fromIndex);
         int i = 0;
         for (List<A> l = this; l.tail != null; l = l.tail, i++) {
             if (i == toIndex)
                 break;
             if (i >= fromIndex)
                 a.add(l.head);
         }
         return Collections.unmodifiableList(a);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/util/List.java@9a66ca7c79fa (annotated)

src/share/classes/com/sun/tools/javac/util/List.java