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1
61 package org.jaxen.expr;
62
63 import java.util.ArrayList  ;
64 import java.util.Iterator ;
65 import java.util.List ;
66
67 import org.jaxen.Context;
68 import org.jaxen.ContextSupport;
69 import org.jaxen.JaxenException;
70 import org.jaxen.UnsupportedAxisException;
71 import org.jaxen.expr.iter.IterableAxis;
72 import org.jaxen.saxpath.Axis;
73
74 public abstract class DefaultStep implements Step
75 {
76 private IterableAxis axis;
77 private PredicateSet predicates;
78
79 public DefaultStep(IterableAxis axis, PredicateSet predicates)
80 {
81 this.axis = axis;
82 this.predicates = predicates;
83 }
84
85 public void addPredicate(Predicate predicate)
86 {
87 this.predicates.addPredicate(predicate);
88 }
89
90 public List getPredicates()
91 {
92 return this.predicates.getPredicates();
93 }
94
95 public PredicateSet getPredicateSet()
96 {
97 return this.predicates;
98 }
99
100 public int getAxis()
101 {
102 return this.axis.value();
103 }
104
105 public IterableAxis getIterableAxis()
106 {
107 return this.axis;
108 }
109
110 public String getAxisName()
111 {
112 return Axis.lookup(getAxis());
113 }
114
115 public String getText()
116 {
117 return this.predicates.getText();
118 }
119
120 public String toString()
121 {
122 return getIterableAxis() + " " + super.toString();
123 }
124
125 public void simplify()
126 {
127 this.predicates.simplify();
128 }
129
130 public Iterator axisIterator(Object contextNode, ContextSupport support)
131 throws UnsupportedAxisException
132 {
133 return getIterableAxis().iterator(contextNode, support);
134 }
135
136 public List evaluate(final Context context) throws JaxenException
137 {
138 final List contextNodeSet = context.getNodeSet();
139 final IdentitySet unique = new IdentitySet();
140 final int contextSize = contextNodeSet.size();
141
142 final ArrayList interimSet = new ArrayList ();
145 final ArrayList newNodeSet = new ArrayList ();
146 final ContextSupport support = context.getContextSupport();
147
148 for ( int i = 0 ; i < contextSize ; ++i )
150 {
151 Object eachContextNode = contextNodeSet.get( i );
152
153
154
161 Iterator axisNodeIter = axis.iterator(eachContextNode, support);
162 while ( axisNodeIter.hasNext() )
163 {
164 Object eachAxisNode = axisNodeIter.next();
165 if ( ! unique.contains( eachAxisNode ) )
166 {
167 if ( matches( eachAxisNode, support ) )
168 {
169 unique.add( eachAxisNode );
170 interimSet.add( eachAxisNode );
171 }
172 }
173 }
174 newNodeSet.addAll(getPredicateSet().evaluatePredicates(
175 interimSet, support ));
176 interimSet.clear();
177 }
178 return newNodeSet;
179 }
180
181 }
182 |
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