DefaultMarkupModel.java

// Copyright 2006, 2007, 2008 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry5.dom;

import org.apache.tapestry5.ioc.internal.util.CollectionFactory;

import java.util.Set;

/**
 * Default implementation of {@link org.apache.tapestry5.dom.MarkupModel} that is appropriate for traditional HTML
 * markup. This conforms to the SGML HTML definition, including some things that are not well formed XML-style markup.
 * Assumes that all tags are lower-case.
 */
public class DefaultMarkupModel implements MarkupModel {
    private final Set<String> EMPTY_ELEMENTS = CollectionFactory.newSet("base", "br", "col", "frame", "hr", "img",
            "input", "link",
            "meta", "option", "param");

    /**
     * Passes all characters but '<', '>' and '&' through unchanged.
     */
    public void encode(String content, StringBuilder buffer) {
        encode(content, false, buffer);
    }

    public String encode(String content) {
        StringBuilder buffer = new StringBuilder(content.length() * 2);

        encode(content, false, buffer);

        return buffer.toString();
    }

    public void encodeQuoted(String content, StringBuilder buffer) {
        encode(content, true, buffer);
    }

    private void encode(String content, boolean encodeQuotes, StringBuilder buffer) {
        char[] array = content.toCharArray();

        for (char ch : array) {
            switch (ch) {
                case '<':
                    buffer.append("<");
                    continue;

                case '>':
                    buffer.append(">");
                    continue;

                case '&':
                    buffer.append("&");
                    continue;

                case '"':
                    if (encodeQuotes) {
                        buffer.append(""");
                        continue;
                    }

                default:
                    buffer.append(ch);
            }
        }
    }

    public EndTagStyle getEndTagStyle(String element) {
        boolean isEmpty = EMPTY_ELEMENTS.contains(element);

        return isEmpty ? EndTagStyle.ABBREVIATE : EndTagStyle.REQUIRE;
    }

    /**
     * Returns false.
     */
    public boolean isXML() {
        return true;
    }
}