langtools/src/share/classes/com/sun/tools/doclets/formats/html/markup/DocType.java
author jjg
Mon, 15 Oct 2012 17:07:55 -0700
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permissions -rw-r--r--
8000666: javadoc should write directly to Writer instead of composing strings Reviewed-by: bpatel
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/*
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 * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package com.sun.tools.doclets.formats.html.markup;
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import java.io.IOException;
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import java.io.Writer;
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import com.sun.tools.doclets.internal.toolkit.Content;
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import com.sun.tools.doclets.internal.toolkit.util.*;
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/**
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 * Class for generating document type for HTML pages of javadoc output.
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 *
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 *  <p><b>This is NOT part of any supported API.
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 *  If you write code that depends on this, you do so at your own risk.
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 *  This code and its internal interfaces are subject to change or
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 *  deletion without notice.</b>
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 *
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 * @author Bhavesh Patel
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 */
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public class DocType extends Content{
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    private String docType;
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    private static DocType transitional;
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    private static DocType frameset;
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    /**
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     * Constructor to construct a DocType object.
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     *
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     * @param type the doctype to be added
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     */
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    private DocType(String type, String dtd) {
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        docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 " + type +
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                "//EN\" \"" + dtd + "\">" + DocletConstants.NL;
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    }
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     /**
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     * Construct and return a HTML 4.01 transitional DocType content
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     *
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     * @return a content tree for transitional DocType
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     */
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    public static DocType Transitional() {
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        if (transitional == null)
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            transitional = new DocType("Transitional", "http://www.w3.org/TR/html4/loose.dtd");
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        return transitional;
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    }
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    /**
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     * Construct and return a HTML 4.01 frameset DocType content
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     *
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     * @return a content tree for frameset DocType
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     */
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    public static DocType Frameset() {
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        if (frameset == null)
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            frameset = new DocType("Frameset", "http://www.w3.org/TR/html4/frameset.dtd");
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        return frameset;
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    }
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    /**
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     * This method is not supported by the class.
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     *
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     * @param content content that needs to be added
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     * @throws DocletAbortException this method will always throw a
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     *                              DocletAbortException because it
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     *                              is not supported.
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     */
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    public void addContent(Content content) {
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        throw new DocletAbortException();
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    }
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    /**
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     * This method is not supported by the class.
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     *
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     * @param stringContent string content that needs to be added
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     * @throws DocletAbortException this method will always throw a
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     *                              DocletAbortException because it
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     *                              is not supported.
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     */
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    public void addContent(String stringContent) {
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        throw new DocletAbortException();
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    }
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    /**
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     * {@inheritDoc}
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     */
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    public boolean isEmpty() {
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        return (docType.length() == 0);
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    }
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    /**
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     * {@inheritDoc}
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     */
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    @Override
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    public boolean write(Writer out, boolean atNewline) throws IOException {
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        out.write(docType);
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        return true; // guaranteed by constructor
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    }
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}