lang-impl/src/com/intellij/ide/projectView/impl/nodes/AbstractPsiBasedNode.java

   1 package com.intellij.ide.projectView.impl.nodes;
   2
   3 import com.intellij.ide.projectView.ProjectViewNode;
   4 import com.intellij.ide.projectView.ViewSettings;
   5 import com.intellij.ide.projectView.PresentationData;
   6 import com.intellij.ide.util.treeView.AbstractTreeNode;
   7 import com.intellij.openapi.project.Project;
   8 import com.intellij.openapi.module.Module;
   9 import com.intellij.openapi.vcs.FileStatus;
  10 import com.intellij.openapi.vcs.FileStatusManager;
  11 import com.intellij.openapi.vfs.VirtualFile;
  12 import com.intellij.openapi.util.Iconable;
  13 import com.intellij.openapi.editor.colors.CodeInsightColors;
  14 import com.intellij.openapi.diagnostic.Logger;
  15 import com.intellij.psi.PsiElement;
  16 import com.intellij.psi.PsiDirectory;
  17 import com.intellij.psi.PsiFile;
  18 import com.intellij.psi.util.PsiUtilBase;
  19 import com.intellij.navigation.NavigationItem;
  20 import org.jetbrains.annotations.Nullable;
  21 import org.jetbrains.annotations.NotNull;
  22
  23 import javax.swing.*;
  24 import java.util.Collection;
  25 import java.util.ArrayList;
  26 import java.util.Collections;
  27
  28 /**
  29  * Class for node descriptors based on PsiElements. Subclasses should define
  30  * method that extract PsiElement from Value.
  31  * @param <Value> Value of node descriptor
  32  */
  33 public abstract class AbstractPsiBasedNode<Value> extends ProjectViewNode<Value> {
  34   private static final Logger LOG = Logger.getInstance(AbstractPsiBasedNode.class.getName());
  35
  36   protected AbstractPsiBasedNode(final Project project,
  37                                 final Value value,
  38                                 final ViewSettings viewSettings) {
  39     super(project, value, viewSettings);
  40   }
  41
  42   @Nullable
  43   protected abstract PsiElement extractPsiFromValue();
  44   @Nullable
  45   protected abstract Collection<AbstractTreeNode> getChildrenImpl();
  46   protected abstract void updateImpl(final PresentationData data);
  47
  48   @NotNull
  49   public final Collection<AbstractTreeNode> getChildren() {
  50     final PsiElement psiElement = extractPsiFromValue();
  51     if (psiElement == null) {
  52       return new ArrayList<AbstractTreeNode>();
  53     }
  54     final boolean valid = psiElement.isValid();
  55     if (!LOG.assertTrue(valid)) {
  56       return Collections.emptyList();
  57     }
  58
  59     final Collection<AbstractTreeNode> children = getChildrenImpl();
  60     return children != null ? children : Collections.<AbstractTreeNode>emptyList();
  61   }
  62
  63   protected boolean isMarkReadOnly() {
  64     final AbstractTreeNode parent = getParent();
  65     if (parent == null) {
  66       return false;
  67     }
  68     if (parent instanceof AbstractPsiBasedNode) {
  69       final PsiElement psiElement = ((AbstractPsiBasedNode)parent).extractPsiFromValue();
  70       return psiElement instanceof PsiDirectory;
  71     }
  72
  73     final Object parentValue = parent.getValue();
  74     return parentValue instanceof PsiDirectory || parentValue instanceof Module;
  75   }
  76
  77
  78   public FileStatus getFileStatus() {
  79     VirtualFile file = getVirtualFileForValue();
  80     if (file == null) {
  81       return FileStatus.NOT_CHANGED;
  82     }
  83     else {
  84       return FileStatusManager.getInstance(getProject()).getStatus(file);
  85     }
  86   }
  87
  88   @Nullable
  89   private VirtualFile getVirtualFileForValue() {
  90     PsiElement psiElement = extractPsiFromValue();
  91     if (psiElement == null) {
  92       return null;
  93     }
  94     return PsiUtilBase.getVirtualFile(psiElement);
  95   }
  96
  97   // Should be called in atomic action
  98
  99   public void update(final PresentationData data) {
 100     if (!validate()) {
 101       return;
 102     }
 103
 104     final PsiElement value = extractPsiFromValue();
 105     LOG.assertTrue(value.isValid());
 106
 107     int flags = Iconable.ICON_FLAG_VISIBILITY;
 108     if (isMarkReadOnly()) {
 109       flags |= Iconable.ICON_FLAG_READ_STATUS;
 110     }
 111
 112     Icon icon = value.getIcon(flags);
 113     data.setClosedIcon(icon);
 114     data.setOpenIcon(icon);
 115     data.setLocationString(myLocationString);
 116     data.setPresentableText(myName);
 117     data.setTooltip(calcTooltip());
 118     if (isDeprecated()) {
 119       data.setAttributesKey(CodeInsightColors.DEPRECATED_ATTRIBUTES);
 120     }
 121     updateImpl(data);
 122   }
 123
 124   protected boolean isDeprecated() {
 125     return false;
 126   }
 127
 128   public boolean contains(@NotNull final VirtualFile file) {
 129     final PsiElement psiElement = extractPsiFromValue();
 130     if (psiElement == null || !psiElement.isValid()) {
 131       return false;
 132     }
 133
 134     final PsiFile containingFile = psiElement.getContainingFile();
 135     if (containingFile == null) {
 136       return false;
 137     }
 138     final VirtualFile valueFile = containingFile.getVirtualFile();
 139     return valueFile != null && file.equals(valueFile);
 140   }
 141
 142   @Nullable
 143   public NavigationItem getNavigationItem() {
 144     final PsiElement psiElement = extractPsiFromValue();
 145     return (psiElement instanceof NavigationItem) ? (NavigationItem) psiElement : null;
 146   }
 147
 148   public void navigate(boolean requestFocus) {
 149     if (canNavigate()) {
 150       getNavigationItem().navigate(requestFocus);
 151     }
 152   }
 153
 154   public boolean canNavigate() {
 155     final NavigationItem item = getNavigationItem();
 156     return item != null && item.canNavigate();
 157   }
 158
 159   public boolean canNavigateToSource() {
 160     final NavigationItem item = getNavigationItem();
 161     return item != null && item.canNavigateToSource();
 162   }
 163
 164   @Nullable
 165   protected String calcTooltip() {
 166     return null;
 167   }
 168
 169   @Override
 170   public boolean validate() {
 171     final PsiElement psiElement = extractPsiFromValue();
 172     if (psiElement == null || !psiElement.isValid()) {
 173       setValue(null);
 174     }
 175
 176     return getValue() != null;
 177   }
 178 }