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/*

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(c) 2005-2007 Sun Microsystems, Inc. All Rights Reserved.

Neither this file nor any files generated from it describe a complete specification, and they may only be used as described below. For example, no permission is given for you to incorporate this file, in whole or in part, in an implementation of a Java specification.

Sun Microsystems Inc. owns the copyright in this file and it is provided to you for informative, as opposed to normative, use. The file and any files generated from it may be used to generate other informative documentation, such as a unified set of documents of API signatures for a platform that includes technologies expressed as Java APIs. The file may also be used to produce "compilation stubs," which allow applications to be compiled and validated for such platforms.

Any work generated from this file, such as unified javadocs or compiled stub files, must be accompanied by this notice in its entirety.

This work corresponds to the API signatures of JSR 219: Foundation Profile 1.1. In the event of a discrepency between this work and the JSR 219 specification, which is available at http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence. */ package java.util; /** * A set that further guarantees that its iterator will traverse the set in * ascending element order, sorted according to the natural ordering of * its elements (see Comparable), or by a Comparator provided at sorted set * creation time. Several additional operations are provided to take * advantage of the ordering. (This interface is the set analogue of * SortedMap.)

* * All elements inserted into an sorted set must implement the Comparable * interface (or be accepted by the specified Comparator). Furthermore, all * such elements must be mutually comparable: e1.compareTo(e2) * (or comparator.compare(e1, e2)) must not throw a * ClassCastException for any elements e1 and e2 in * the sorted set. Attempts to violate this restriction will cause the * offending method or constructor invocation to throw a * ClassCastException.

* * Note that the ordering maintained by a sorted set (whether or not an * explicit comparator is provided) must be consistent with equals if * the sorted set is to correctly implement the Set interface. (See * the Comparable interface or Comparator interface for a * precise definition of consistent with equals.) This is so because * the Set interface is defined in terms of the equals * operation, but a sorted set performs all element comparisons using its * compareTo (or compare) method, so two elements that are * deemed equal by this method are, from the standpoint of the sorted set, * equal. The behavior of a sorted set is well-defined even if its * ordering is inconsistent with equals; it just fails to obey the general * contract of the Set interface.

* * All general-purpose sorted set implementation classes should provide four * "standard" constructors: 1) A void (no arguments) constructor, which * creates an empty sorted set sorted according to the natural order of * its elements. 2) A constructor with a single argument of type * Comparator, which creates an empty sorted set sorted according to * the specified comparator. 3) A constructor with a single argument of type * Collection, which creates a new sorted set with the same elements * as its argument, sorted according to the elements' natural ordering. 4) A * constructor with a single argument of type SortedSet, which * creates a new sorted set with the same elements and the same ordering as * the input sorted set. There is no way to enforce this recommendation (as * interfaces cannot contain constructors) but the SDK implementation (the * TreeSet class) complies.

* * This interface is a member of the * * Java Collections Framework. * * @author Josh Bloch * @version 1.15, 02/02/00 * @see Set * @see TreeSet * @see SortedMap * @see Collection * @see Comparable * @see Comparator * @see java.lang.ClassCastException * @since 1.2 */ public interface SortedSet extends Set { /** * Returns the comparator associated with this sorted set, or * null if it uses its elements' natural ordering. * * @return the comparator associated with this sorted set, or * null if it uses its elements' natural ordering. */ public Comparator comparator(); /** * Returns a view of the portion of this sorted set whose elements range * from fromElement, inclusive, to toElement, exclusive. * (If fromElement and toElement are equal, the returned * sorted set is empty.) The returned sorted set is backed by this sorted * set, so changes in the returned sorted set are reflected in this sorted * set, and vice-versa. The returned sorted set supports all optional set * operations that this sorted set supports.

* * The sorted set returned by this method will throw an * IllegalArgumentException if the user attempts to insert a * element outside the specified range.

* * Note: this method always returns a half-open range (which * includes its low endpoint but not its high endpoint). If you need a * closed range (which includes both endpoints), and the element * type allows for calculation of the successor a given value, merely * request the subrange from lowEndpoint to * successor(highEndpoint). For example, suppose that s * is a sorted set of strings. The following idiom obtains a view * containing all of the strings in s from low to * high, inclusive:

     * SortedSet sub = s.subSet(low, high+"\0");
     * 
* * A similar technique can be used to generate an open range (which * contains neither endpoint). The following idiom obtains a view * containing all of the Strings in s from low to * high, exclusive:
     * SortedSet sub = s.subSet(low+"\0", high);
     * 
* * @param fromElement low endpoint (inclusive) of the subSet. * @param toElement high endpoint (exclusive) of the subSet. * @return a view of the specified range within this sorted set. * * @throws ClassCastException if fromElement and * toElement cannot be compared to one another using this * set's comparator (or, if the set has no comparator, using * natural ordering). Implementations may, but are not required * to, throw this exception if fromElement or * toElement cannot be compared to elements currently in * the set. * @throws IllegalArgumentException if fromElement is greater than * toElement; or if this set is itself a subSet, headSet, * or tailSet, and fromElement or toElement are * not within the specified range of the subSet, headSet, or * tailSet. * @throws NullPointerException if fromElement or * toElement is null and this sorted set does * not tolerate null elements. */ public SortedSet subSet(Object fromElement, Object toElement); /** * Returns a view of the portion of this sorted set whose elements are * strictly less than toElement. The returned sorted set is * backed by this sorted set, so changes in the returned sorted set are * reflected in this sorted set, and vice-versa. The returned sorted set * supports all optional set operations.

* * The sorted set returned by this method will throw an * IllegalArgumentException if the user attempts to insert a * element outside the specified range.

* * Note: this method always returns a view that does not contain its * (high) endpoint. If you need a view that does contain this endpoint, * and the element type allows for calculation of the successor a given * value, merely request a headSet bounded by * successor(highEndpoint). For example, suppose that s * is a sorted set of strings. The following idiom obtains a view * containing all of the strings in s that are less than or equal * to high: *

    SortedSet head = s.headSet(high+"\0");
* * @param toElement high endpoint (exclusive) of the headSet. * @return a view of the specified initial range of this sorted set. * @throws ClassCastException if toElement is not compatible * with this set's comparator (or, if the set has no comparator, * if toElement does not implement Comparable). * Implementations may, but are not required to, throw this * exception if toElement cannot be compared to elements * currently in the set. * @throws NullPointerException if toElement is null and * this sorted set does not tolerate null elements. * @throws IllegalArgumentException if this set is itself a subSet, * headSet, or tailSet, and toElement is not within the * specified range of the subSet, headSet, or tailSet. */ public SortedSet headSet(Object toElement); /** * Returns a view of the portion of this sorted set whose elements are * greater than or equal to fromElement. The returned sorted set * is backed by this sorted set, so changes in the returned sorted set are * reflected in this sorted set, and vice-versa. The returned sorted set * supports all optional set operations.

* * The sorted set returned by this method will throw an * IllegalArgumentException if the user attempts to insert a * element outside the specified range.

* * Note: this method always returns a view that contains its (low) * endpoint. If you need a view that does not contain this endpoint, and * the element type allows for calculation of the successor a given value, * merely request a tailSet bounded by successor(lowEndpoint). * For example, suppose that s is a sorted set of strings. The * following idiom obtains a view containing all of the strings in * s that are strictly greater than low: * *

    SortedSet tail = s.tailSet(low+"\0");
* * @param fromElement low endpoint (inclusive) of the tailSet. * @return a view of the specified final range of this sorted set. * @throws ClassCastException if fromElement is not compatible * with this set's comparator (or, if the set has no comparator, * if fromElement does not implement Comparable). * Implementations may, but are not required to, throw this * exception if fromElement cannot be compared to elements * currently in the set. * @throws NullPointerException if fromElement is null * and this sorted set does not tolerate null elements. * @throws IllegalArgumentException if this set is itself a subSet, * headSet, or tailSet, and fromElement is not within the * specified range of the subSet, headSet, or tailSet. */ public SortedSet tailSet(Object fromElement); /** * Returns the first (lowest) element currently in this sorted set. * * @return the first (lowest) element currently in this sorted set. * @throws NoSuchElementException sorted set is empty. */ public Object first(); /** * Returns the last (highest) element currently in this sorted set. * * @return the last (highest) element currently in this sorted set. * @throws NoSuchElementException sorted set is empty. */ public Object last(); }




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