/*
 * @(#)SimpleJavaFileObject.java	1.13 06/06/25
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.tools;

import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.CharBuffer;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.NestingKind;
import javax.tools.JavaFileObject.Kind;

/**
 * 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 Ahé
 * @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) {
        // null checks
        uri.getClass();
        kind.getClass();
        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;