XMLOutput.java

/*
 * XML input/output support for FindBugs
 * Copyright (C) 2004, University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.xml;

import java.io.IOException;

import edu.umd.cs.findbugs.annotations.CleanupObligation;
import edu.umd.cs.findbugs.annotations.DischargesObligation;

/**
 * Interface to generate an XML document in some form. E.g., writing it to a
 * stream, generating SAX events, etc.
 * 
 * @author David Hovemeyer
 */
@CleanupObligation
public interface XMLOutput {
    /**
     * Begin the XML document.
     */
    public void beginDocument() throws IOException;

    /**
     * Open a tag with given name.
     * 
     * @param tagName
     *            the tag name
     */
    public void openTag(String tagName) throws IOException;

    /**
     * Open a tag with given name and given attributes.
     * 
     * @param tagName
     *            the tag name
     * @param attributeList
     *            the attributes
     */
    public void openTag(String tagName, XMLAttributeList attributeList) throws IOException;

    /**
     * Start a tag, with the intention of adding attributes. Must be followed by
     * stopTag after zero or more addAttribute calls.
     * 
     * @param tagName
     *            the tag name
     */
    public void startTag(String tagName) throws IOException;

    /**
     * Add an attribute to a started tag. Must follow a call to startTag.
     * 
     * @param name
     *            the attribute name.
     * @param value
     *            the attribute value, unescaped.
     */
    public void addAttribute(String name, String value) throws IOException;

    /**
     * End a started tag. Must follow a call to startTag.
     * 
     * @param close
     *            true if the element has no content.
     */
    public void stopTag(boolean close) throws IOException;

    /**
     * Open and close tag with given name.
     * 
     * @param tagName
     *            the tag name
     */
    public void openCloseTag(String tagName) throws IOException;

    /**
     * Open and close tag with given name and given attributes.
     * 
     * @param tagName
     *            the tag name
     * @param attributeList
     *            the attributes
     */
    public void openCloseTag(String tagName, XMLAttributeList attributeList) throws IOException;

    /**
     * Close tag with given name.
     * 
     * @param tagName
     *            the tag name
     */
    public void closeTag(String tagName) throws IOException;

    /**
     * Write text to the XML document. XML metacharacters are automatically
     * escaped.
     * 
     * @param text
     *            the text to write
     */
    public void writeText(String text) throws IOException;

    /**
     * Write a CDATA section to the XML document. The characters are not escaped
     * in any way.
     * 
     * @param cdata
     *            the character data to write
     */
    public void writeCDATA(String cdata) throws IOException;

    /**
     * Finish writing XML output, closing any underlying resources (such as
     * output streams). A call to this method should always be made, even if one
     * of the XML-generation methods throws an exception. Therefore, a call to
     * this method should be performed in a finally block.
     */
    @DischargesObligation
    public void finish() throws IOException;
}

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