/*
* All content copyright Terracotta, Inc., unless otherwise indicated.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terracotta.context.query;
import org.terracotta.context.TreeNode;
import java.util.HashSet;
import java.util.Set;
class Filter implements Query {
private final Matcher<? super TreeNode> filter;
public Filter(Matcher<? super TreeNode> filter) {
if (filter == null) {
throw new NullPointerException("Cannot filter using a null matcher");
} else {
this.filter = filter;
}
}
@Override
public Set<TreeNode> execute(Set<TreeNode> input) {
Set<TreeNode> output = new HashSet<>(input);
output.removeIf(treeNode -> !filter.matches(treeNode));
return output;
}
@Override
public String toString() {
return "filter for nodes with " + filter;
}
}