xref: /aosp_15_r20/external/snakeyaml/src/test/java/examples/CustomImplicitResolverTest.java (revision ac2a7c1bf4e14d82f3bd566dcc2d76d5b42faf34)

/**
 * Copyright (c) 2008, SnakeYAML
 *
 * 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 examples;

import java.math.BigDecimal;
import java.util.Map;
import java.util.regex.Pattern;
import junit.framework.TestCase;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.AbstractConstruct;
import org.yaml.snakeyaml.constructor.SafeConstructor;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.nodes.Tag;

/**
 * Use custom implicit resolver when the runtime class is not defined.
 * http://code.google.com/p/snakeyaml/issues/detail?id=75
 */
public class CustomImplicitResolverTest extends TestCase {

  private final Tag CUSTOM_TAG = new Tag("!BigDecimalDividedBy100");
  private final Pattern CUSTOM_PATTERN = Pattern.compile("\\d+%");

  @SuppressWarnings("unchecked")
  public void testImplicit() {
    Yaml yaml = new Yaml(new BigConstructor());
    yaml.addImplicitResolver(CUSTOM_TAG, CUSTOM_PATTERN, "-0123456789");
    Map<String, Object> obj = yaml.load("bar: 50%");
    assertEquals("0.5", obj.get("bar").toString());
    assertEquals(BigDecimal.class, obj.get("bar").getClass());
  }

  public void testImplicitFailure() {
    Yaml yaml = new Yaml(new BigConstructor());
    yaml.addImplicitResolver(CUSTOM_TAG, Pattern.compile("\\d+%"), "-0123456789");
    try {
      yaml.load("bar: !!float 50%");
      fail("Both implicit and explicit are present.");
    } catch (NumberFormatException e) {
      assertEquals("For input string: \"50%\"", e.getMessage());
    }
  }

  class BigConstructor extends SafeConstructor {

    public BigConstructor() {
      this.yamlConstructors.put(CUSTOM_TAG, new ConstructBig());
    }

    private class ConstructBig extends AbstractConstruct {

      public Object construct(Node node) {
        String val = constructScalar((ScalarNode) node);
        return new BigDecimal(val.substring(0, val.length() - 1)).divide(new BigDecimal(100));
      }
    }
  }
}