View Javadoc

    1   /*
    2    *
    3    *   Copyright 2005-2006 The Apache Software Foundation.
    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 org.apache.commons.scxml.env;
    19
    20  import java.net.MalformedURLException;
    21  import java.net.URL;
    22
    23  import org.apache.commons.logging.Log;
    24  import org.apache.commons.logging.LogFactory;
    25  import org.apache.commons.scxml.PathResolver;
    26
    27  /***
    28   * A PathResolver implementation that resolves against a base URL.
    29   *
    30   * @see org.apache.commons.scxml.PathResolver
    31   */
    32  public class URLResolver implements PathResolver {
    33
    34      /*** Implementation independent log category. */
    35      private Log log = LogFactory.getLog(PathResolver.class);
    36
    37      /*** The base URL to resolve against. */
    38      private URL baseURL = null;
    39
    40      /***
    41       * Constructor.
    42       *
    43       * @param baseURL The base URL to resolve against
    44       */
    45      public URLResolver(final URL baseURL) {
    46          this.baseURL = baseURL;
    47      }
    48
    49      /***
    50       * Uses URL(URL, String) constructor to combine URL's.
    51       * @see org.apache.commons.scxml.PathResolver#resolvePath(java.lang.String)
    52       */
    53      public String resolvePath(final String ctxPath) {
    54          URL combined;
    55          try {
    56              combined = new URL(baseURL, ctxPath);
    57              return combined.toString();
    58          } catch (MalformedURLException e) {
    59              log.error("Malformed URL", e);
    60          }
    61          return null;
    62      }
    63
    64      /***
    65       * @see org.apache.commons.scxml.PathResolver#getResolver(java.lang.String)
    66       */
    67      public PathResolver getResolver(final String ctxPath) {
    68          URL combined;
    69          try {
    70              combined = new URL(baseURL, ctxPath);
    71              return new URLResolver(combined);
    72          } catch (MalformedURLException e) {
    73              log.error("Malformed URL", e);
    74          }
    75          return null;
    76      }
    77
    78  }
    79