content: /*
   * Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package jdkx.tools;
  
  import java.io.*;
  import java.net.URI;
  import java.nio.CharBuffer;
  import java.util.Objects;
  import jdkx.lang.model.element.Modifier;
  import jdkx.lang.model.element.NestingKind;
  
  /**
   * Provides simple implementations for most methods in JavaFileObject.
   * This class is designed to be subclassed and used as a basis for
   * JavaFileObject implementations.  Subclasses can override the
   * implementation and specification of any method of this class as
   * long as the general contract of JavaFileObject is obeyed.
   *
   * @author Peter von der Ah&eacute;
   * @since 1.6
   */
  public class SimpleJavaFileObject implements JavaFileObject {
      /**
       * A URI for this file object.
       */
      protected final URI uri;
  
      /**
       * The kind of this file object.
       */
      protected final Kind kind;
  
      /**
       * Construct a SimpleJavaFileObject of the given kind and with the
       * given URI.
       *
       * @param uri  the URI for this file object
       * @param kind the kind of this file object
       */
      protected SimpleJavaFileObject(URI uri, Kind kind) {
          Objects.requireNonNull(uri);
          Objects.requireNonNull(kind);
          if (uri.getPath() == null)
              throw new IllegalArgumentException("URI must have a path: " + uri);
          this.uri = uri;
          this.kind = kind;
      }
  
      public URI toUri() {
          return uri;
      }
  
      public String getName() {
          return toUri().getPath();
      }
  
      /**
       * This implementation always throws {@linkplain
       * UnsupportedOperationException}.  Subclasses can change this
       * behavior as long as the contract of {@link FileObject} is
       * obeyed.
       */
      public InputStream openInputStream() throws IOException {
          throw new UnsupportedOperationException();
      }
  
      /**
       * This implementation always throws {@linkplain
       * UnsupportedOperationException}.  Subclasses can change this
       * behavior as long as the contract of {@link FileObject} is
       * obeyed.
       */
      public OutputStream openOutputStream() throws IOException {
          throw new UnsupportedOperationException();
      }
  
      /**
       * Wraps the result of {@linkplain #getCharContent} in a Reader.
       * Subclasses can change this behavior as long as the contract of
       * {@link FileObject} is obeyed.
       *
       * @param  ignoreEncodingErrors {@inheritDoc}
       * @return a Reader wrapping the result of getCharContent
       * @throws IllegalStateException {@inheritDoc}
       * @throws UnsupportedOperationException {@inheritDoc}
       * @throws IOException {@inheritDoc}
       */
      public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
          CharSequence charContent = getCharContent(ignoreEncodingErrors);
          if (charContent == null)
              throw new UnsupportedOperationException();
          if (charContent instanceof CharBuffer) {
              CharBuffer buffer = (CharBuffer)charContent;
              if (buffer.hasArray())
                  return new CharArrayReader(buffer.array());
          }
          return new StringReader(charContent.toString());
      }
  
      /**
       * This implementation always throws {@linkplain
       * UnsupportedOperationException}.  Subclasses can change this
       * behavior as long as the contract of {@link FileObject} is
       * obeyed.
       */
      public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
          throw new UnsupportedOperationException();
      }
  
      /**
       * Wraps the result of openOutputStream in a Writer.  Subclasses
       * can change this behavior as long as the contract of {@link
       * FileObject} is obeyed.
       *
       * @return a Writer wrapping the result of openOutputStream
       * @throws IllegalStateException {@inheritDoc}
       * @throws UnsupportedOperationException {@inheritDoc}
       * @throws IOException {@inheritDoc}
       */
      public Writer openWriter() throws IOException {
          return new OutputStreamWriter(openOutputStream());
      }
  
      /**
       * This implementation returns {@code 0L}.  Subclasses can change
       * this behavior as long as the contract of {@link FileObject} is
       * obeyed.
       *
       * @return {@code 0L}
       */
      public long getLastModified() {
          return 0L;
      }
  
      /**
       * This implementation does nothing.  Subclasses can change this
       * behavior as long as the contract of {@link FileObject} is
       * obeyed.
       *
       * @return {@code false}
       */
      public boolean delete() {
          return false;
      }
  
      /**
       * @return {@code this.kind}
       */
      public Kind getKind() {
          return kind;
      }
  
      /**
       * This implementation compares the path of its URI to the given
       * simple name.  This method returns true if the given kind is
       * equal to the kind of this object, and if the path is equal to
       * {@code simpleName + kind.extension} or if it ends with {@code
       * "/" + simpleName + kind.extension}.
       *
       * <p>This method calls {@link #getKind} and {@link #toUri} and
       * does not access the fields {@link #uri} and {@link #kind}
       * directly.
       *
       * <p>Subclasses can change this behavior as long as the contract
       * of {@link JavaFileObject} is obeyed.
       */
      public boolean isNameCompatible(String simpleName, Kind kind) {
          String baseName = simpleName + kind.extension;
          return kind.equals(getKind())
              && (baseName.equals(toUri().getPath())
                  || toUri().getPath().endsWith("/" + baseName));
      }
  
      /**
       * This implementation returns {@code null}.  Subclasses can
       * change this behavior as long as the contract of
       * {@link JavaFileObject} is obeyed.
       */
      public NestingKind getNestingKind() { return null; }
  
      /**
       * This implementation returns {@code null}.  Subclasses can
       * change this behavior as long as the contract of
       * {@link JavaFileObject} is obeyed.
       */
      public Modifier getAccessLevel()  { return null; }
  
      @Override
      public String toString() {
          return getClass().getName() + "[" + toUri() + "]";
      }
  }
  