Source Code Cross Referenced for JenaParameters.java in  » RSS-RDF » Jena-2.5.5 » com » hp » hpl » jena » shared » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.shared.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /******************************************************************
002:         * File:        JenaParameters.java
003:         * Created by:  Dave Reynolds
004:         * Created on:  23-Aug-2003
005:         * 
006:         * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
007:         * [See end of file]
008:         * $Id: JenaParameters.java,v 1.12 2008/01/02 12:11:34 andy_seaborne Exp $
009:         *****************************************************************/package com.hp.hpl.jena.shared.impl;
010:
011:        /**
012:         * This class holds global, static, configuration parameters that
013:         * affect the behaviour of the Jena API. These should not be changed
014:         * unless you are sure you know what you are doing and even then 
015:         * should ideally only be changed before any Models are created or processed.
016:         * <p>
017:         * These parameters should not be regarded as a stable part of the API. If
018:         * we find them being used significantly that probably means they should be
019:         * moved to being model-specific rather than global.
020:         * </p>
021:         * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
022:         * @version $Revision: 1.12 $ on $Date: 2008/01/02 12:11:34 $
023:         */
024:        public class JenaParameters {
025:
026:            //  =======================================================================
027:            //  Parameters affected handling of typed literals
028:
029:            /** 
030:             * <p> Set this flag to true to cause typed literals to be
031:             * validated as they are created. </p>
032:             * <p>
033:             * RDF does not require ill-formed typed literals to be rejected from a graph
034:             * but rather allows them to be included but marked as distinct from
035:             * all legally formed typed literals. Jena2 reflects this by optionally
036:             * delaying validation of literals against datatype type constraints until
037:             * the first access. </p>
038:             */
039:            public static boolean enableEagerLiteralValidation = false;
040:
041:            /**
042:             * Set this flag to true to allow language-free, plain literals and xsd:strings
043:             * containing the same character sequence to test as sameAs.
044:             * <p>
045:             * RDF plain literals and typed literals of type xsd:string are distinct, not
046:             * least because plain literals may have a language tag which typed literals
047:             * may not. However, in the absence of a languge tag it can be convenient
048:             * for applications if the java objects representing identical character
049:             * strings in these two ways test as semantically "sameAs" each other.
050:             * At the time of writing is unclear if such identification would be sanctioned
051:             * by the RDF working group. </p> 
052:             */
053:            public static boolean enablePlainLiteralSameAsString = true;
054:
055:            /**
056:             * Set this flag to true to allow unknown literal datatypes to be
057:             * accepted, if false then such literals will throw an exception when
058:             * first detected. Note that any datatypes unknown datatypes encountered
059:             * whilst this flag is 'true' will be automatically registered (as a type 
060:             * whose value and lexical spaces are identical). Subsequently turning off
061:             * this flag will not unregister those unknown types already encountered.
062:             * <p>
063:             * RDF allows any URI to be used to indicate a datatype. Jena2 allows
064:             * user defined datatypes to be registered but it is sometimes convenient
065:             * to be able to process models containing unknown datatypes (e.g. when the
066:             * application does not need to touch the value form of the literal). However,
067:             * this behaviour means that common errors, such as using the wrong URI for
068:             * xsd datatypes, may go unnoticed and throw obscure errors late in processing.
069:             * Hence, the default is the require unknown datatypes to be registered.
070:             */
071:            public static boolean enableSilentAcceptanceOfUnknownDatatypes = true;
072:
073:            /**
074:             * Set this flag to true to switch on checking of surrounding whitespace
075:             * in non-string XSD numeric types. In the false (default) setting then
076:             * leading and trailing white space is silently trimmed when parsing an
077:             * XSD numberic typed literal.
078:             */
079:            public static boolean enableWhitespaceCheckingOfTypedLiterals = false;
080:
081:            /**
082:             * Set this flag to true (default) to hide certain internal nodes from the output
083:             * of inference graphs. Some rule sets (notably owl-fb) create blank nodes as 
084:             * part of their reasoning process. If these match some query they can appear
085:             * in the results. Such nodes are recorded as "hidden" and if this flag is set
086:             * all triples involving such hidden nodes will be removed from the output - any
087:             * indirect consequences will, however, still be visible.  
088:             */
089:            public static boolean enableFilteringOfHiddenInfNodes = true;
090:
091:            /**
092:             * If this flag is true (default) then attmempts to build an OWL inference
093:             * graph over another OWL inference graph will log a warning message.
094:             */
095:            public static boolean enableOWLRuleOverOWLRuleWarnings = true;
096:
097:            /**
098:             * If this flag is true (default is false) then bNodes are assigned a
099:             * simple count local to this JVM. This is ONLY for use in debugging
100:             * systems exhibiting non-deterministic behaviour due to the 
101:             * time-dependence of UIDs, not for normal production use. In particular, it
102:             * breaks the contract that anonIDs should be unique on the same machine: they 
103:             * will only be unique for this single JVM run.
104:             */
105:            public static boolean disableBNodeUIDGeneration = false;
106:        }
107:
108:        /*
109:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
110:         All rights reserved.
111:
112:         Redistribution and use in source and binary forms, with or without
113:         modification, are permitted provided that the following conditions
114:         are met:
115:
116:         1. Redistributions of source code must retain the above copyright
117:         notice, this list of conditions and the following disclaimer.
118:
119:         2. Redistributions in binary form must reproduce the above copyright
120:         notice, this list of conditions and the following disclaimer in the
121:         documentation and/or other materials provided with the distribution.
122:
123:         3. The name of the author may not be used to endorse or promote products
124:         derived from this software without specific prior written permission.
125:
126:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
127:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
128:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
129:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
130:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
131:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
132:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
133:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
134:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
135:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
136:         */
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