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2000-10-29 Bryce McKinlay <bryce@albatross.co.nz> * java/util/AbstractCollection.java (addAll): Use size() instead of hasNext() in iterator loop. (clear): Ditto. (contains): Ditto. Simplify loop. (containsAll): Ditto. (remove): Ditto. (removeAll): Ditto. (retainAll): Ditto. (toArray): Ditto. (toString): Ditto. Use string concatenation operators, not StringBuffer. * java/util/AbstractList.java (addAll): Use size() instead of hasNext() in iterator loop. (equals): Ditto. (hashCode): Ditto. (indexOf): Ditto. Don't take null check outside of the loop. (iterator): Return an AbstractListItr instead of anonymous class. (lastIndexOf): Use a for loop bounded by size() instead of hasPrevious() in iterator loop. (listIterator): Return an AbstractListItr. (removeRange): Remove bounds checking code and docs. (AbstractListItr): New inner class. Code moved here from listIterator(). (SubList.iterator): Removed. Use default implementation from AbstractList instead. (SubList.listIterator): As above. * java/util/AbstractMap.java (clear): Use a for loop bounded by size() instead of hasNext() in iterator loop. (containsValue): Ditto. (equals): Ditto. (get): Ditto. (put): Ditto. (putAll): Ditto. (remove): Ditto. (toString): Ditto. Use string concatenation operators, not StringBuffer. * java/util/AbstractSequentialList.java (addAll): Use a for loop bounded by size() instead of hasNext() in iterator loop. * java/util/AbstractSet.java (hashCode): Don't catch exception as part of normal execution flow. Do an explicit null check instead. * java/util/ArrayList.java (_iSize): Rename to `size'. (_arData): Rename to `data'. (get): Check lower bounds also. Simplify IndexOutOfBoundsException message. (remove): Ditto. (removeRange): Make protected. Don't check bounds. (add): Check lower bounds also. Simplify IndexOutOfBoundsException message. (addAll (Collection)): Use a size-bounded for loop instead of hasNext() check. (addAll (int, Collection)): Check lower bounds. Simplify exception string. (clone): Clone the data array too. (indexOf): Inline doesEqual(). (lastIndexOf): Ditto. (clear): Don't set array data to null. (set): Check lower bounds. Simplify exception string. (toArray): Correct comment. (trimToSize): Don't update modCount, this is not a structural change. Add comment. * java/util/BitSet.java: Merged with classpath, new JDK 1.2 methods implemented. (toString): Declare `bit' as long, not int. (data): Made package-private, not private. From-SVN: r37116
84 lines
3.0 KiB
Java
84 lines
3.0 KiB
Java
/* AbstractSet.java -- Abstract implementation of most of Set
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Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.util;
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/**
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* An abstract implementation of Set to make it easier to create your own
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* implementations. In order to create a Set, subclass AbstractSet and
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* implement the same methods that are required for AbstractCollection
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* (although these methods must of course meet the requirements that Set puts
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* on them - specifically, no element may be in the set more than once). This
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* class simply provides implementations of equals() and hashCode() to fulfil
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* the requirements placed on them by the Set interface.
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*/
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public abstract class AbstractSet extends AbstractCollection implements Set
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{
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/**
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* Tests whether the given object is equal to this Set. This implementation
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* first checks whether this set <em>is</em> the given object, and returns
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* true if so. Otherwise, if o is a Set and is the same size as this one, it
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* returns the result of calling containsAll on the given Set. Otherwise, it
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* returns false.
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*
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* @param o the Object to be tested for equality with this Set
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* @return true if the given object is equal to this Set
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*/
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public boolean equals(Object o)
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{
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if (o == this)
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return true;
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else if (o instanceof Set && ((Set) o).size() == size())
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return containsAll((Collection) o);
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else
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return false;
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}
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/**
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* Returns a hash code for this Set. The hash code of a Set is the sum of the
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* hash codes of all its elements, except that the hash code of null is
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* defined to be zero. This implementation obtains an Iterator over the Set,
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* and sums the results.
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*
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* @return a hash code for this Set
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*/
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public int hashCode()
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{
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Iterator itr = iterator();
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int size = size();
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int hash = 0;
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for (int pos = 0; pos < size; pos++)
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{
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Object obj = itr.next();
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if (obj != null)
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hash += obj.hashCode();
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}
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return hash;
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}
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}
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