001: // ============================================================================
002: // $Id: AndBinary.java,v 1.8 2006/01/08 00:52:25 davidahall Exp $
003: // Copyright (c) 2002-2005 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:
033: package net.sf.jga.fn.adaptor;
034:
035: import net.sf.jga.fn.BinaryFunctor;
036: import net.sf.jga.fn.BinaryPredicate;
037:
038: /**
039: * Binary that performs a shortcircuit and operation using a given pair of
040: * Boolean BinaryFunctors. When the first functor returns true, the second
041: * is not evaluated.
042: **/
043:
044: public class AndBinary<T1, T2> extends BinaryPredicate<T1, T2> {
045:
046: static final long serialVersionUID = -398298816385302196L;
047:
048: // The two binarys that are tested
049: private BinaryFunctor<T1, T2, Boolean> _first;
050: private BinaryFunctor<T1, T2, Boolean> _second;
051:
052: /**
053: * Builds a AndBinary functor, given the two functors that may be executed.
054: * @throws IllegalArgumentException if any of the functors is missing
055: */
056: public AndBinary(BinaryFunctor<T1, T2, Boolean> first,
057: BinaryFunctor<T1, T2, Boolean> second) {
058: if (first == null || second == null) {
059: throw new IllegalArgumentException(
060: "Two functors are required");
061: }
062:
063: _first = first;
064: _second = second;
065: }
066:
067: public BinaryFunctor<T1, T2, Boolean> getFirstFunctor() {
068: return _first;
069: }
070:
071: public BinaryFunctor<T1, T2, Boolean> getSecondFunctor() {
072: return _second;
073: }
074:
075: public Boolean fn(T1 arg1, T2 arg2) {
076: return _first.fn(arg1, arg2) && _second.fn(arg1, arg2);
077: }
078:
079: /**
080: * Calls the Visitor's <code>visit(AndBinary)</code> method, if it
081: * implements the nested Visitor interface.
082: */
083: public void accept(net.sf.jga.fn.Visitor v) {
084: if (v instanceof AndBinary.Visitor)
085: ((AndBinary.Visitor) v).visit(this );
086: else
087: v.visit(this );
088: }
089:
090: // Object overrides
091:
092: public String toString() {
093: return _first + " && " + _second;
094: }
095:
096: // AcyclicVisitor
097:
098: /**
099: * Interface for classes that may interpret an <b>AndBinaryFunctor</b> predicate.
100: */
101: public interface Visitor extends net.sf.jga.fn.Visitor {
102: public void visit(AndBinary host);
103: }
104: }
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