| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||
| VariableContext |
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| 1.0;1 |
| 1 | /* |
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| 2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/VariableContext.java,v 1.9 2005/09/25 11:40:36 elharo Exp $ |
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| 3 | * $Revision: 1.9 $ |
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| 4 | * $Date: 2005/09/25 11:40:36 $ |
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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: VariableContext.java,v 1.9 2005/09/25 11:40:36 elharo Exp $ |
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| 60 | */ |
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| 61 | ||
| 62 | ||
| 63 | package org.jaxen; |
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| 64 | ||
| 65 | /** Resolves variable bindings within an XPath expression. |
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| 66 | * |
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| 67 | * <p> |
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| 68 | * Variables within an XPath expression are denoted using |
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| 69 | * notation such as <code>$varName</code> or |
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| 70 | * <code>$nsPrefix:varName</code>, and may |
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| 71 | * refer to a <code>Boolean</code>, <code>Double</code>, <code>String</code>, |
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| 72 | * node-set (<code>List</code>) or individual XML node. |
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| 73 | * </p> |
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| 74 | * |
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| 75 | * <p> |
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| 76 | * When a variable is bound to a node-set, the |
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| 77 | * actual Java object returned should be a <code>java.util.List</code> |
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| 78 | * containing XML nodes from the object-model (e.g. dom4j, JDOM, DOM, etc.) |
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| 79 | * being used with the XPath. |
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| 80 | * </p> |
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| 81 | * |
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| 82 | * <p> |
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| 83 | * A variable may validly be assigned the <code>null</code> value, |
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| 84 | * but an unbound variable (one that this context does not know about) |
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| 85 | * should cause an {@link UnresolvableException} to be thrown. |
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| 86 | * </p> |
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| 87 | * |
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| 88 | * @see SimpleVariableContext |
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| 89 | * @see NamespaceContext |
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| 90 | * |
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| 91 | * @author <a href="mailto:bob@werken.com">bob mcwhirter</a> |
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| 92 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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| 93 | */ |
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| 94 | public interface VariableContext |
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| 95 | { |
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| 96 | /** An implementation should return the value of an XPath variable |
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| 97 | * based on the namespace URI and local name of the variable-reference |
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| 98 | * expression. |
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| 99 | * |
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| 100 | * <p> |
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| 101 | * It must not use the prefix parameter to select a variable, |
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| 102 | * because a prefix could be bound to any namespace; the prefix parameter |
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| 103 | * could be used in debugging output or other generated information. |
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| 104 | * The prefix may otherwise be ignored. |
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| 105 | * </p> |
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| 106 | * |
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| 107 | * @param namespaceURI the namespace URI to which the prefix parameter |
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| 108 | * is bound in the XPath expression. If the variable |
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| 109 | * reference expression had no prefix, the namespace |
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| 110 | * URI is <code>null</code>. |
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| 111 | * @param prefix the prefix that was used in the variable reference |
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| 112 | * expression; this value is ignored and has no effect |
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| 113 | * @param localName the local name of the variable-reference |
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| 114 | * expression. If there is no prefix, then this is |
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| 115 | * the whole name of the variable. |
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| 116 | * |
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| 117 | * @return the variable's value (which can be <code>null</code>) |
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| 118 | * @throws UnresolvableException when the variable cannot be resolved |
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| 119 | */ |
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| 120 | public Object getVariableValue( String namespaceURI, |
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| 121 | String prefix, |
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| 122 | String localName ) |
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| 123 | throws UnresolvableException; |
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| 124 | } |