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/**
* Copyright (c) 2008, http://www.snakeyaml.org
*
* 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.yaml.snakeyaml.issues.issue139;
import java.util.List;
import java.util.Map;
import junit.framework.TestCase;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
import org.yaml.snakeyaml.error.YAMLException;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeTuple;
public class UniqueKeyTest extends TestCase {
public void testNotUnique() {
String data = "{key: 1, key: 2}";
Yaml yaml = new Yaml(new UniqueKeyConstructor());
try {
yaml.load(data);
fail("The same key must be rejected");
} catch (Exception e) {
assertEquals("The key is not unique key", e.getMessage());
}
}
private class UniqueKeyConstructor extends Constructor {
@Override
protected void constructMapping2ndStep(MappingNode node, Map<Object, Object> mapping) {
List<NodeTuple> nodeValue = (List<NodeTuple>) node.getValue();
for (NodeTuple tuple : nodeValue) {
Node keyNode = tuple.getKeyNode();
Node valueNode = tuple.getValueNode();
Object key = constructObject(keyNode);
if (key != null) {
key.hashCode();// check circular dependencies
}
Object value = constructObject(valueNode);
Object old = mapping.put(key, value);
if (old != null) {
throw new YAMLException("The key is not unique " + key);
}
}
}
}
}
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