platform/platform-impl/src/com/intellij/ide/util/PropertiesComponentImpl.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.ide.util;
  17
  18 import com.intellij.openapi.components.*;
  19 import com.intellij.util.containers.HashMap;
  20 import org.jdom.Element;
  21 import org.jetbrains.annotations.NonNls;
  22 import org.jetbrains.annotations.NotNull;
  23
  24
  25 public class PropertiesComponentImpl extends PropertiesComponent
  26     implements PersistentStateComponent<Element> {
  27   private final HashMap<String, String> myMap = new HashMap<String, String>();
  28   @NonNls private static final String ELEMENT_PROPERTY = "property";
  29   @NonNls private static final String ATTRIBUTE_NAME = "name";
  30   @NonNls private static final String ATTRIBUTE_VALUE = "value";
  31
  32
  33   @NotNull
  34   public String getComponentName() {
  35     return "PropertiesComponent";
  36   }
  37
  38   PropertiesComponentImpl() {
  39   }
  40
  41
  42
  43   public Element getState() {
  44     Element parentNode = new Element("state");
  45     for (final String key : myMap.keySet()) {
  46       String value = myMap.get(key);
  47       if (value != null) {
  48         Element element = new Element(ELEMENT_PROPERTY);
  49         element.setAttribute(ATTRIBUTE_NAME, key);
  50         element.setAttribute(ATTRIBUTE_VALUE, value);
  51         parentNode.addContent(element);
  52       }
  53     }
  54     return parentNode;
  55   }
  56
  57   public void loadState(final Element parentNode) {
  58     myMap.clear();
  59     for (final Object o : parentNode.getChildren(ELEMENT_PROPERTY)) {
  60       Element e = (Element)o;
  61
  62       String name = e.getAttributeValue(ATTRIBUTE_NAME);
  63       String value = e.getAttributeValue(ATTRIBUTE_VALUE);
  64
  65       if (name != null) {
  66         myMap.put(name, value);
  67       }
  68     }
  69   }
  70
  71   public String getValue(String name) {
  72     return myMap.get(name);
  73   }
  74
  75   public void setValue(String name, String value) {
  76     myMap.put(name, value);
  77   }
  78
  79   public boolean isValueSet(String name) {
  80     return myMap.containsKey(name);
  81   }
  82 }