| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
| CountFunction |
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| 3.0;3 |
| 1 | /* |
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| 2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/CountFunction.java,v 1.13 2005/06/28 13:44:45 elharo Exp $ |
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| 3 | * $Revision: 1.13 $ |
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| 4 | * $Date: 2005/06/28 13:44:45 $ |
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| 5 | * |
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| 6 | * ==================================================================== |
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| 7 | * |
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| 8 | * Copyright (C) 2000-2002 bob mcwhirter & James Strachan. |
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| 9 | * All rights reserved. |
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| 10 | * |
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| 11 | * Redistribution and use in source and binary forms, with or without |
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| 12 | * modification, are permitted provided that the following conditions |
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| 13 | * are met: |
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| 14 | * |
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| 15 | * 1. Redistributions of source code must retain the above copyright |
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| 16 | * notice, this list of conditions, and the following disclaimer. |
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| 17 | * |
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| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 19 | * notice, this list of conditions, and the disclaimer that follows |
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| 20 | * these conditions in the documentation and/or other materials |
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| 21 | * provided with the distribution. |
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| 22 | * |
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| 23 | * 3. The name "Jaxen" must not be used to endorse or promote products |
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| 24 | * derived from this software without prior written permission. For |
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| 25 | * written permission, please contact license@jaxen.org. |
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| 26 | * |
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| 27 | * 4. Products derived from this software may not be called "Jaxen", nor |
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| 28 | * may "Jaxen" appear in their name, without prior written permission |
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| 29 | * from the Jaxen Project Management (pm@jaxen.org). |
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| 30 | * |
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| 31 | * In addition, we request (but do not require) that you include in the |
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| 32 | * end-user documentation provided with the redistribution and/or in the |
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| 33 | * software itself an acknowledgement equivalent to the following: |
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| 34 | * "This product includes software developed by the |
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| 35 | * Jaxen Project <http://www.jaxen.org/>." |
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| 36 | * Alternatively, the acknowledgment may be graphical using the logos |
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| 37 | * available at http://www.jaxen.org/ |
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| 38 | * |
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| 39 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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| 40 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 41 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 42 | * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT |
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| 43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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| 45 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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| 46 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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| 47 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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| 48 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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| 49 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 50 | * SUCH DAMAGE. |
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| 51 | * |
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| 52 | * ==================================================================== |
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| 53 | * This software consists of voluntary contributions made by many |
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| 54 | * individuals on behalf of the Jaxen Project and was originally |
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| 55 | * created by bob mcwhirter <bob@werken.com> and |
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| 56 | * James Strachan <jstrachan@apache.org>. For more information on the |
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| 57 | * Jaxen Project, please see <http://www.jaxen.org/>. |
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| 58 | * |
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| 59 | * $Id: CountFunction.java,v 1.13 2005/06/28 13:44:45 elharo Exp $ |
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| 60 | */ |
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| 61 | ||
| 62 | package org.jaxen.function; |
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| 63 | ||
| 64 | import java.util.List; |
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| 65 | ||
| 66 | import org.jaxen.Context; |
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| 67 | import org.jaxen.Function; |
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| 68 | import org.jaxen.FunctionCallException; |
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| 69 | ||
| 70 | /** |
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| 71 | * <p><b>4.1</b> <code><i>number</i> count(<i>node-set</i>)</code></p> |
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| 72 | * |
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| 73 | * <blockquote src="http://www.w3.org/TR/xpath#function-count"> |
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| 74 | * The <b>count</b> function returns the number of nodes in the argument node-set. |
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| 75 | * </blockquote> |
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| 76 | * @author bob mcwhirter (bob @ werken.com) |
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| 77 | * @see <a href="http://www.w3.org/TR/xpath#function-count">Section 4.1 of the XPath Specification</a> |
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| 78 | */ |
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| 79 | public class CountFunction implements Function |
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| 80 | { |
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| 81 | ||
| 82 | /** |
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| 83 | * Create a new <code>CountFunction</code> object. |
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| 84 | */ |
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| 85 | 294 | public CountFunction() {} |
| 86 | ||
| 87 | /** |
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| 88 | * <p> |
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| 89 | * Returns the number of nodes in the specified node-set. |
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| 90 | * </p> |
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| 91 | * @param context ignored |
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| 92 | * @param args the function arguments |
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| 93 | * |
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| 94 | * @return a <code>Double</code> giving the integral number of items in the first argument |
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| 95 | * |
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| 96 | * @throws FunctionCallException if args does not have exactly one |
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| 97 | * item; or that item is not a <code>List</code> |
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| 98 | */ |
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| 99 | public Object call(Context context, |
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| 100 | List args) throws FunctionCallException |
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| 101 | { |
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| 102 | 1608 | if (args.size() == 1) |
| 103 | { |
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| 104 | 1596 | return evaluate( args.get(0) ); |
| 105 | } |
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| 106 | ||
| 107 | 12 | throw new FunctionCallException( "count() requires one argument." ); |
| 108 | } |
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| 109 | ||
| 110 | /** |
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| 111 | * <p> |
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| 112 | * Returns the number of nodes in the specified node-set. |
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| 113 | * </p> |
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| 114 | * |
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| 115 | * @param obj a <code>List</code> of nodes |
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| 116 | * @return the integral number of items in the list |
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| 117 | * @throws FunctionCallException if obj is not a <code>List</code> |
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| 118 | */ |
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| 119 | public static Double evaluate(Object obj) throws FunctionCallException |
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| 120 | { |
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| 121 | ||
| 122 | 1596 | if (obj instanceof List) |
| 123 | { |
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| 124 | 1590 | return new Double( ((List) obj).size() ); |
| 125 | } |
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| 126 | ||
| 127 | 6 | throw new FunctionCallException("count() function can only be used for node-sets"); |
| 128 | ||
| 129 | } |
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| 130 | ||
| 131 | } |