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    1   /*
    2    /*
    3    * Copyright 2005 John G. Wilson
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   */
    18  package groovy.util.slurpersupport;
    19
    20  import java.util.Iterator;
    21  import java.util.Map;
    22
    23  import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
    24
    25  import groovy.lang.Closure;
    26
    27  /***
    28   * Lazy evaluated representation of nodes filtered by attributes.
    29   *
    30   * @author John Wilson
    31   */
    32  public class FilteredAttributes extends Attributes
    33  {
    34      private final Closure closure;
    35
    36      public FilteredAttributes(final GPathResult parent, final Closure closure, final Map namespaceTagHints) {
    37          super(parent, parent.name, namespaceTagHints);
    38          this.closure = closure;
    39      }
    40
    41      public Iterator nodeIterator() {
    42          return new NodeIterator(this.parent.iterator())
    43          {
    44              protected Object getNextNode(final Iterator iter) {
    45                  while (iter.hasNext()) {
    46                      final Object node = iter.next();
    47                      if (DefaultTypeTransformation.castToBoolean(FilteredAttributes.this.closure.call(new Object[]{node}))) {
    48                          return node;
    49                      }
    50                  }
    51                  return null;
    52              }
    53          };
    54      }
    55
    56  }