RuleManager xref

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    1   /*
    2    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    3    *
    4    * This software is open source.
    5    * See the bottom of this file for the licence.
    6    */
    7
    8   package org.dom4j.rule;
    9
    10  import java.util.HashMap;
    11
    12  import org.dom4j.Document;
    13  import org.dom4j.Element;
    14  import org.dom4j.Node;
    15  import org.dom4j.rule.pattern.NodeTypePattern;
    16
    17  /***
    18   * <p>
    19   * <code>RuleManager</code> manages a set of rules such that a rule can be
    20   * found for a given DOM4J Node using the XSLT processing model.
    21   * </p>
    22   *
    23   * @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
    24   * @version $Revision: 1.9 $
    25   */
    26  public class RuleManager {
    27      /*** Map of modes indexed by mode */
    28      private HashMap modes = new HashMap();
    29
    30      /***
    31       * A counter so that rules can be ordered by the order in which they were
    32       * added to the rule base
    33       */
    34      private int appearenceCount;
    35
    36      /*** Holds value of property valueOfAction. */
    37      private Action valueOfAction;
    38
    39      public RuleManager() {
    40      }
    41
    42      /***
    43       * DOCUMENT ME!
    44       *
    45       * @param modeName
    46       *            DOCUMENT ME!
    47       *
    48       * @return the Mode instance for the given mode name. If one does not exist
    49       *         then it will be created.
    50       */
    51      public Mode getMode(String modeName) {
    52          Mode mode = (Mode) modes.get(modeName);
    53
    54          if (mode == null) {
    55              mode = createMode();
    56              modes.put(modeName, mode);
    57          }
    58
    59          return mode;
    60      }
    61
    62      public void addRule(Rule rule) {
    63          rule.setAppearenceCount(++appearenceCount);
    64
    65          Mode mode = getMode(rule.getMode());
    66          Rule[] childRules = rule.getUnionRules();
    67
    68          if (childRules != null) {
    69              for (int i = 0, size = childRules.length; i < size; i++) {
    70                  mode.addRule(childRules[i]);
    71              }
    72          } else {
    73              mode.addRule(rule);
    74          }
    75      }
    76
    77      public void removeRule(Rule rule) {
    78          Mode mode = getMode(rule.getMode());
    79          Rule[] childRules = rule.getUnionRules();
    80
    81          if (childRules != null) {
    82              for (int i = 0, size = childRules.length; i < size; i++) {
    83                  mode.removeRule(childRules[i]);
    84              }
    85          } else {
    86              mode.removeRule(rule);
    87          }
    88      }
    89
    90      /***
    91       * Performs an XSLT processing model match for the rule which matches the
    92       * given Node the best.
    93       *
    94       * @param modeName
    95       *            is the name of the mode associated with the rule if any
    96       * @param node
    97       *            is the DOM4J Node to match against
    98       *
    99       * @return the matching Rule or no rule if none matched
    100      */
    101     public Rule getMatchingRule(String modeName, Node node) {
    102         Mode mode = (Mode) modes.get(modeName);
    103
    104         if (mode != null) {
    105             return mode.getMatchingRule(node);
    106         } else {
    107             System.out.println("Warning: No Mode for mode: " + mode);
    108
    109             return null;
    110         }
    111     }
    112
    113     public void clear() {
    114         modes.clear();
    115         appearenceCount = 0;
    116     }
    117
    118     // Properties
    119     // -------------------------------------------------------------------------
    120
    121     /***
    122      * DOCUMENT ME!
    123      *
    124      * @return the default value-of action which is used in the default rules
    125      *         for the pattern "text()|&#64;"
    126      */
    127     public Action getValueOfAction() {
    128         return valueOfAction;
    129     }
    130
    131     /***
    132      * Sets the default value-of action which is used in the default rules for
    133      * the pattern "text()|&#64;"
    134      *
    135      * @param valueOfAction
    136      *            DOCUMENT ME!
    137      */
    138     public void setValueOfAction(Action valueOfAction) {
    139         this.valueOfAction = valueOfAction;
    140     }
    141
    142     // Implementation methods
    143     // -------------------------------------------------------------------------
    144
    145     /***
    146      * A factory method to return a new {@link Mode}instance which should add
    147      * the necessary default rules
    148      *
    149      * @return DOCUMENT ME!
    150      */
    151     protected Mode createMode() {
    152         Mode mode = new Mode();
    153         addDefaultRules(mode);
    154
    155         return mode;
    156     }
    157
    158     /***
    159      * Adds the default stylesheet rules to the given {@link Mode}instance
    160      *
    161      * @param mode
    162      *            DOCUMENT ME!
    163      */
    164     protected void addDefaultRules(final Mode mode) {
    165         // add an apply templates rule
    166         Action applyTemplates = new Action() {
    167             public void run(Node node) throws Exception {
    168                 if (node instanceof Element) {
    169                     mode.applyTemplates((Element) node);
    170                 } else if (node instanceof Document) {
    171                     mode.applyTemplates((Document) node);
    172                 }
    173             }
    174         };
    175
    176         Action valueOf = getValueOfAction();
    177
    178         addDefaultRule(mode, NodeTypePattern.ANY_DOCUMENT, applyTemplates);
    179         addDefaultRule(mode, NodeTypePattern.ANY_ELEMENT, applyTemplates);
    180
    181         if (valueOf != null) {
    182             addDefaultRule(mode, NodeTypePattern.ANY_ATTRIBUTE, valueOf);
    183             addDefaultRule(mode, NodeTypePattern.ANY_TEXT, valueOf);
    184         }
    185     }
    186
    187     protected void addDefaultRule(Mode mode, Pattern pattern, Action action) {
    188         Rule rule = createDefaultRule(pattern, action);
    189         mode.addRule(rule);
    190     }
    191
    192     protected Rule createDefaultRule(Pattern pattern, Action action) {
    193         Rule rule = new Rule(pattern, action);
    194         rule.setImportPrecedence(-1);
    195
    196         return rule;
    197     }
    198 }
    199
    200 /*
    201  * Redistribution and use of this software and associated documentation
    202  * ("Software"), with or without modification, are permitted provided that the
    203  * following conditions are met:
    204  *
    205  * 1. Redistributions of source code must retain copyright statements and
    206  * notices. Redistributions must also contain a copy of this document.
    207  *
    208  * 2. Redistributions in binary form must reproduce the above copyright notice,
    209  * this list of conditions and the following disclaimer in the documentation
    210  * and/or other materials provided with the distribution.
    211  *
    212  * 3. The name "DOM4J" must not be used to endorse or promote products derived
    213  * from this Software without prior written permission of MetaStuff, Ltd. For
    214  * written permission, please contact dom4j-info@metastuff.com.
    215  *
    216  * 4. Products derived from this Software may not be called "DOM4J" nor may
    217  * "DOM4J" appear in their names without prior written permission of MetaStuff,
    218  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
    219  *
    220  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
    221  *
    222  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
    223  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    224  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    225  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
    226  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    227  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    228  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    229  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    230  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    231  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    232  * POSSIBILITY OF SUCH DAMAGE.
    233  *
    234  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    235  */