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1   /*
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3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
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25  
26  package com.sun.xml.internal.xsom.impl.scd;
27  
28  import com.sun.xml.internal.xsom.SCD;
29  import com.sun.xml.internal.xsom.XSComponent;
30  
31  import java.util.Iterator;
32  
33  /**
34   * Schema component designator.
35   *
36   * @author Kohsuke Kawaguchi
37   */
38  public final class SCDImpl extends SCD {
39      /**
40       * SCD is fundamentally a list of steps.
41       */
42      private final Step[] steps;
43  
44      /**
45       * The original textual SCD representation.
46       */
47      private final String text;
48  
49      public SCDImpl(String text, Step[] steps) {
50          this.text = text;
51          this.steps = steps;
52      }
53  
54      public Iterator<XSComponent> select(Iterator<? extends XSComponent> contextNode) {
55          Iterator<XSComponent> nodeSet = (Iterator)contextNode;
56  
57          int len = steps.length;
58          for( int i=0; i<len; i++ ) {
59              if(i!=0 && i!=len-1 && !steps[i-1].axis.isModelGroup() && steps[i].axis.isModelGroup()) {
60                  // expand the current nodeset by adding abbreviatable complex type and model groups.
61                  // note that such expansion is not allowed to occure in in between model group axes.
62  
63                  // TODO: this step is not needed if the next step is known not to react to
64                  // complex type nor model groups, such as, say Axis.FACET
65                  nodeSet = new Iterators.Unique<XSComponent>(
66                      new Iterators.Map<XSComponent,XSComponent>(nodeSet) {
67                          protected Iterator<XSComponent> apply(XSComponent u) {
68                              return new Iterators.Union<XSComponent>(
69                                  Iterators.singleton(u),
70                                  Axis.INTERMEDIATE_SKIP.iterator(u) );
71                          }
72                      }
73                  );
74              }
75              nodeSet = steps[i].evaluate(nodeSet);
76          }
77  
78          return nodeSet;
79      }
80  
81      public String toString() {
82          return text;
83      }
84  }