001: // ============================================================================
002: // $Id: TransformUnary.java,v 1.8 2006/05/08 02:22:04 davidahall Exp $
003: // Copyright (c) 2003-2005 David A. Hall
004: // ============================================================================
005: // The contents of this file are subject to the Common Development and
006: // Distribution License (CDDL), Version 1.0 (the License); you may not use this
007: // file except in compliance with the License. You should have received a copy
008: // of the the License along with this file: if not, a copy of the License is
009: // available from Sun Microsystems, Inc.
010: //
011: // http://www.sun.com/cddl/cddl.html
012: //
013: // From time to time, the license steward (initially Sun Microsystems, Inc.) may
014: // publish revised and/or new versions of the License. You may not use,
015: // distribute, or otherwise make this file available under subsequent versions
016: // of the License.
017: //
018: // Alternatively, the contents of this file may be used under the terms of the
019: // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
020: // case the provisions of the LGPL are applicable instead of those above. If you
021: // wish to allow use of your version of this file only under the terms of the
022: // LGPL, and not to allow others to use your version of this file under the
023: // terms of the CDDL, indicate your decision by deleting the provisions above
024: // and replace them with the notice and other provisions required by the LGPL.
025: // If you do not delete the provisions above, a recipient may use your version
026: // of this file under the terms of either the CDDL or the LGPL.
027: //
028: // This library is distributed in the hope that it will be useful,
029: // but WITHOUT ANY WARRANTY; without even the implied warranty of
030: // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
031: // ============================================================================
032: package net.sf.jga.fn.algorithm;
033:
034: import net.sf.jga.fn.UnaryFunctor;
035: import net.sf.jga.util.TransformIterator;
036: import java.util.Iterator;
037:
038: /**
039: * Applies a UnaryFunctor to every element in an iteration, and iterates
040: * over the results.
041: * <p>
042: * Copyright © 2003-2005 David A. Hall
043: *
044: * @author <a href="mailto:davidahall@users.sf.net">David A. Hall</a>
045: * @deprecated
046: */
047:
048: public class TransformUnary<T, R> extends
049: UnaryFunctor<Iterator<? extends T>, TransformIterator<T, R>> {
050: static final long serialVersionUID = -5437939894267586472L;
051:
052: private UnaryFunctor<T, R> _fn;
053:
054: /**
055: * Builds an TransformUnary functor that will apply the given functor to
056: * elements in an iteration.
057: * @throws IllegalArgumentException if the functor is null
058: */
059: public TransformUnary(UnaryFunctor<T, R> fn) {
060: if (fn == null)
061: throw new IllegalArgumentException();
062:
063: _fn = fn;
064: }
065:
066: /**
067: * Returns the functor used to process elements in an iteration.
068: */
069: public UnaryFunctor<T, R> getFunction() {
070: return _fn;
071: }
072:
073: /**
074: * Apply the functor to each element in the iteration and return an iterator
075: * over the results
076: *
077: * @return an iterator over the results of the transformation
078: */
079: public TransformIterator<T, R> fn(Iterator<? extends T> iterator) {
080: return new TransformIterator<T, R>(iterator, _fn);
081: }
082:
083: /**
084: * Calls the Visitor's <code>visit(TransformUnary)</code> method, if it
085: * implements the nested Visitor interface.
086: */
087: public void accept(net.sf.jga.fn.Visitor v) {
088: if (v instanceof TransformUnary.Visitor)
089: ((TransformUnary.Visitor) v).visit(this );
090: else
091: v.visit(this );
092: }
093:
094: // Object overrides
095:
096: public String toString() {
097: return "TransformUnary";
098: }
099:
100: // AcyclicVisitor
101:
102: /**
103: * Interface for classes that may interpret an <b>TransformUnary</b> functor.
104: */
105: public interface Visitor extends net.sf.jga.fn.Visitor {
106: public void visit(TransformUnary host);
107: }
108: }
|