/*

 * Copyright (c) 2003, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.doclets.formats.html.markup;

import java.io.IOException;

import java.io.Writer;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import com.sun.tools.doclets.internal.toolkit.Content;

/**

 * A sequence of Content nodes.

 */

public class ContentBuilder extends Content {

    protected List<Content> contents = Collections.<Content>emptyList();

    @Override

    public void addContent(Content content) {

        nullCheck(content);

        ensureMutableContents();

        if (content instanceof ContentBuilder) {

            contents.addAll(((ContentBuilder) content).contents);

        } else

            contents.add(content);

    }

    @Override

    public void addContent(String text) {

        if (text.isEmpty())

            return;

        ensureMutableContents();

        Content c = contents.isEmpty() ? null : contents.get(contents.size() - 1);

        StringContent sc;

        if (c != null && c instanceof StringContent) {

            sc = (StringContent) c;

        } else {

            contents.add(sc = new StringContent());

        }

        sc.addContent(text);

    }

    @Override

    public boolean write(Writer writer, boolean atNewline) throws IOException {

        for (Content content: contents) {

            atNewline = content.write(writer, atNewline);

        }

        return atNewline;

    }

    @Override

    public boolean isEmpty() {

        for (Content content: contents) {

            if (!content.isEmpty())

                return false;

        }

        return true;

    }

    @Override

    public int charCount() {

        int n = 0;

        for (Content c : contents)

            n += c.charCount();

        return n;

    }

    private void ensureMutableContents() {

        if (contents.isEmpty())

    }

}