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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.integration.beans;
    21
    22  import java.beans.PropertyEditor;
    23  import java.lang.reflect.Array;
    24  import java.util.ArrayList;
    25  import java.util.List;
    26  import java.util.regex.Matcher;
    27
    28  /**
    29   * A {@link PropertyEditor} which converts a {@link String} into
    30   * a one-dimensional array and vice versa.
    31   *
    32   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    33   */
    34  public class ArrayEditor extends AbstractPropertyEditor {
    35      private final Class<?> componentType;
    36
    37      public ArrayEditor(Class<?> componentType) {
    38          if (componentType == null) {
    39              throw new IllegalArgumentException("componentType");
    40          }
    41
    42          this.componentType = componentType;
    43          getComponentEditor();
    44          setTrimText(false);
    45      }
    46
    47      private PropertyEditor getComponentEditor() {
    48          PropertyEditor e = PropertyEditorFactory.getInstance(componentType);
    49          if (e == null) {
    50              throw new IllegalArgumentException("No " + PropertyEditor.class.getSimpleName() + " found for "
    51                      + componentType.getSimpleName() + '.');
    52          }
    53          return e;
    54      }
    55
    56      @Override
    57      protected String toText(Object value) {
    58          Class<?> componentType = value.getClass().getComponentType();
    59          if (componentType == null) {
    60              throw new IllegalArgumentException("not an array: " + value);
    61          }
    62
    63          PropertyEditor e = PropertyEditorFactory.getInstance(componentType);
    64          if (e == null) {
    65              throw new IllegalArgumentException("No " + PropertyEditor.class.getSimpleName() + " found for "
    66                      + componentType.getSimpleName() + '.');
    67          }
    68
    69          StringBuilder buf = new StringBuilder();
    70          for (int i = 0; i < Array.getLength(value); i++) {
    71              e.setValue(Array.get(value, i));
    72              // TODO normalize.
    73              String s = e.getAsText();
    74              buf.append(s);
    75              buf.append(", ");
    76          }
    77
    78          // Remove the last delimiter.
    79          if (buf.length() >= 2) {
    80              buf.setLength(buf.length() - 2);
    81          }
    82          return buf.toString();
    83      }
    84
    85      @Override
    86      protected Object toValue(String text) throws IllegalArgumentException {
    87          PropertyEditor e = getComponentEditor();
    88          List<Object> values = new ArrayList<Object>();
    89          Matcher m = CollectionEditor.ELEMENT.matcher(text);
    90          boolean matchedDelimiter = true;
    91
    92          while (m.find()) {
    93              if (m.group(1) != null) {
    94                  matchedDelimiter = true;
    95                  continue;
    96              }
    97
    98              if (!matchedDelimiter) {
    99                  throw new IllegalArgumentException("No delimiter between elements: " + text);
    100             }
    101
    102             // TODO escape here.
    103             e.setAsText(m.group());
    104             values.add(e.getValue());
    105
    106             matchedDelimiter = false;
    107             if (m.group(2) != null || m.group(3) != null) {
    108                 // Skip the last '"'.
    109                 m.region(m.end() + 1, m.regionEnd());
    110             }
    111         }
    112
    113         Object answer = Array.newInstance(componentType, values.size());
    114         for (int i = 0; i < Array.getLength(answer); i++) {
    115             Array.set(answer, i, values.get(i));
    116         }
    117         return answer;
    118     }
    119 }