LightElement

Author: tangzx

IntelliJ-Core/src/main/java/com/intellij/psi/impl/light/LightElement.java

@@ -0,0 +1,210 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.intellij.psi.impl.light;
+
+import com.intellij.lang.ASTNode;
+import com.intellij.lang.Language;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiElementVisitor;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.PsiManager;
+import com.intellij.psi.impl.PsiElementBase;
+import com.intellij.util.IncorrectOperationException;
+import org.jetbrains.annotations.NotNull;
+
+public abstract class LightElement extends PsiElementBase {
+  protected final PsiManager myManager;
+  private final Language myLanguage;
+  private volatile PsiElement myNavigationElement = this;
+
+  protected LightElement(@NotNull PsiManager manager, @NotNull Language language) {
+    myManager = manager;
+    myLanguage = language;
+  }
+
+  @Override
+  @NotNull
+  public Language getLanguage() {
+    return myLanguage;
+  }
+
+  @Override
+  public PsiManager getManager() {
+    return myManager;
+  }
+
+  @Override
+  public PsiElement getParent() {
+    return null;
+  }
+
+  @Override
+  @NotNull
+  public PsiElement[] getChildren() {
+    return PsiElement.EMPTY_ARRAY;
+  }
+
+  @Override
+  public PsiFile getContainingFile() {
+    return null;
+  }
+
+  @Override
+  public TextRange getTextRange() {
+    return null;
+  }
+
+  @Override
+  public int getStartOffsetInParent() {
+    return -1;
+  }
+
+  @Override
+  public final int getTextLength() {
+    String text = getText();
+    return text != null ? text.length() : 0;
+  }
+
+  @Override
+  @NotNull
+  public char[] textToCharArray() {
+    return getText().toCharArray();
+  }
+
+  @Override
+  public boolean textMatches(@NotNull CharSequence text) {
+    return getText().equals(text.toString());
+  }
+
+  @Override
+  public boolean textMatches(@NotNull PsiElement element) {
+    return getText().equals(element.getText());
+  }
+
+  @Override
+  public PsiElement findElementAt(int offset) {
+    return null;
+  }
+
+  @Override
+  public int getTextOffset() {
+    return -1;
+  }
+
+  @Override
+  public boolean isValid() {
+    final PsiElement navElement = getNavigationElement();
+    if (navElement != this) {
+      return navElement.isValid();
+    }
+
+    return true;
+  }
+
+  @Override
+  public boolean isWritable() {
+    return false;
+  }
+
+  @Override
+  public boolean isPhysical() {
+    return false;
+  }
+
+  @Override
+  public abstract String toString();
+
+  @Override
+  public void checkAdd(@NotNull PsiElement element) throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public PsiElement add(@NotNull PsiElement element) throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public PsiElement addBefore(@NotNull PsiElement element, PsiElement anchor) throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public PsiElement addAfter(@NotNull PsiElement element, PsiElement anchor) throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public void delete() throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public void checkDelete() throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public PsiElement replace(@NotNull PsiElement newElement) throws IncorrectOperationException {
+    throw new IncorrectOperationException(getClass().getName());
+  }
+
+  @Override
+  public ASTNode getNode() {
+    return null;
+  }
+
+  @Override
+  public String getText() {
+    return null;
+  }
+
+  @Override
+  public void accept(@NotNull PsiElementVisitor visitor) {
+  }
+
+  @Override
+  public PsiElement copy() {
+    return null;
+  }
+
+  @NotNull
+  @Override
+  public PsiElement getNavigationElement() {
+    return myNavigationElement;
+  }
+
+  public void setNavigationElement(@NotNull PsiElement navigationElement) {
+    PsiElement nnElement = navigationElement.getNavigationElement();
+    if (nnElement != navigationElement && nnElement != null) {
+      navigationElement = nnElement;
+    }
+    myNavigationElement = navigationElement;
+  }
+
+  @Override
+  public PsiElement getPrevSibling() {
+    return null;
+  }
+
+  @Override
+  public PsiElement getNextSibling() {
+    return null;
+  }
+
+}