com.sun.tools.oldlets.internal.toolkit.Content Maven / Gradle / Ivy
/*
* Copyright (c) 2010, 2013, 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
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*/
package com.sun.tools.oldlets.internal.toolkit;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import com.sun.tools.oldlets.internal.toolkit.util.*;
/**
* A class to create content for javadoc output pages.
*
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*
* @author Bhavesh Patel
*/
public abstract class Content {
/**
* Returns a string representation of the content.
*
* @return string representation of the content
*/
@Override
public String toString() {
StringWriter out = new StringWriter();
try {
write(out, true);
} catch (IOException e) {
// cannot happen from StringWriter
throw new DocletAbortException(e);
}
return out.toString();
}
/**
* Adds content to the existing content.
*
* @param content content that needs to be added
*/
public abstract void addContent(Content content);
/**
* Adds a string content to the existing content.
*
* @param stringContent the string content to be added
*/
public abstract void addContent(String stringContent);
/**
* Writes content to a writer.
*
*/
public abstract boolean write(Writer writer, boolean atNewline) throws IOException ;
/**
* Returns true if the content is empty.
*
* @return true if no content to be displayed else return false
*/
public abstract boolean isEmpty();
/**
* Returns true if the content is valid.
*
* @return true if the content is valid else return false
*/
public boolean isValid() {
return !isEmpty();
}
/**
* Return the number of characters of plain text content in this object
* (optional operation.)
* @return the number of characters of plain text content in this
*/
public int charCount() {
return 0;
}
/**
* Checks for null values.
*
* @param t reference type to check for null values
* @return the reference type if not null or else throws a null pointer exception
*/
protected static T nullCheck(T t) {
t.getClass();
return t;
}
}