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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  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 org.apache.log4j.xml;
    19
    20  import org.xml.sax.EntityResolver;
    21  import org.xml.sax.InputSource;
    22
    23  import java.io.ByteArrayInputStream;
    24
    25
    26  /**
    27   * An {@link EntityResolver} specifically designed to return
    28   * an empty InputSource for logger.dtd.
    29   *
    30   */
    31  public final class UtilLoggingEntityResolver implements EntityResolver {
    32
    33      /**
    34       * Create new instance.
    35       */
    36      public UtilLoggingEntityResolver() {
    37          super();
    38      }
    39
    40
    41      /** {@inheritDoc} */
    42    public InputSource resolveEntity(final String publicId,
    43                                     final String systemId) {
    44      if (systemId.endsWith("logger.dtd")) {
    45        return new InputSource(new ByteArrayInputStream(new byte[0]));
    46      } else {
    47        return null;
    48      }
    49    }
    50  }