xml/dom-impl/src/com/intellij/util/xml/impl/PhysicalDomParentStrategy.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.util.xml.impl;
  17
  18 import com.intellij.psi.PsiElement;
  19 import com.intellij.psi.xml.XmlElement;
  20 import com.intellij.psi.xml.XmlEntityRef;
  21 import com.intellij.psi.xml.XmlTag;
  22 import org.jetbrains.annotations.NotNull;
  23
  24 /**
  25  * @author peter
  26  */
  27 public class PhysicalDomParentStrategy implements DomParentStrategy {
  28   private XmlElement myElement;
  29   private DomManagerImpl myDomManager;
  30
  31   public PhysicalDomParentStrategy(@NotNull final XmlElement element, DomManagerImpl domManager) {
  32     myElement = element;
  33     myDomManager = domManager;
  34   }
  35
  36   public DomInvocationHandler getParentHandler() {
  37     final XmlTag parentTag = getParentTag(myElement);
  38     assert parentTag != null;
  39     return myDomManager.getDomHandler(parentTag);
  40   }
  41
  42   public static XmlTag getParentTag(final XmlElement xmlElement) {
  43     return (XmlTag)getParentTagCandidate(xmlElement);
  44   }
  45
  46   public static PsiElement getParentTagCandidate(final XmlElement xmlElement) {
  47     final PsiElement parent = xmlElement.getParent();
  48     return parent instanceof XmlEntityRef ? parent.getParent() : parent;
  49   }
  50
  51   @NotNull
  52   public final XmlElement getXmlElement() {
  53     return myElement;
  54   }
  55
  56   @NotNull
  57   public DomParentStrategy refreshStrategy(final DomInvocationHandler handler) {
  58     return this;
  59   }
  60
  61   @NotNull
  62   public DomParentStrategy setXmlElement(@NotNull final XmlElement element) {
  63     myElement = element;
  64     return this;
  65   }
  66
  67   @NotNull
  68   public DomParentStrategy clearXmlElement() {
  69     final DomInvocationHandler parent = getParentHandler();
  70     assert parent != null : "write operations should be performed on the DOM having a parent, your DOM may be not very fresh";
  71     return new VirtualDomParentStrategy(parent);
  72   }
  73
  74   public boolean isValid() {
  75     return myElement.isValid();
  76   }
  77
  78   public boolean equals(final Object o) {
  79     if (this == o) return true;
  80     if (!(o instanceof PhysicalDomParentStrategy)) return false;
  81
  82     final PhysicalDomParentStrategy that = (PhysicalDomParentStrategy)o;
  83
  84     if (!myElement.equals(that.myElement)) return false;
  85
  86     return true;
  87   }
  88
  89   public int hashCode() {
  90     return myElement.hashCode();
  91   }
  92 }