com.d3x.morpheus.viz.html.HtmlElement Maven / Gradle / Ivy
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/*
* Copyright (C) 2014-2018 D3X Systems - All Rights Reserved
*
* 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 com.d3x.morpheus.viz.html;
import java.util.HashSet;
import java.util.Set;
import java.util.function.Consumer;
import com.d3x.morpheus.util.Collect;
/**
* A class that defines a convenience API for writing out element content using an HtmlWriter.
*
* @author Xavier Witdouck
*
* This is open source software released under the Apache 2.0 License
*/
public class HtmlElement {
private static final Set newLineSet = new HashSet<>();
private static final Set noIndentSet = new HashSet<>();
private String name;
private boolean attrs;
private HtmlCode writer;
private boolean mixedContent;
/**
* Static initializer
*/
static {
newLineSet.addAll(Collect.asSet(
"html", "body", "head", "script", "div", "p", "h1", "h2", "h3", "h4", "input", "dl", "ol", "area", "canvas",
"code", "table", "tr", "td", "thead", "form", "hr", "meta", "nav", "ol", "option", "pre", "section", "select",
"tbody", "textarea", "tfoot", "th", "title"
));
}
/**
* Static initializer
*/
static {
noIndentSet.add("html");
noIndentSet.add("body");
noIndentSet.add("img");
noIndentSet.add("span");
}
/**
* Constructor
* @param name the name for this element
* @param writer the writer
*/
HtmlElement(String name, HtmlCode writer) {
this.name = name;
this.attrs = true;
this.writer = writer;
if (newLineSet.contains(name.toLowerCase())) {
this.writer.newLine();
}
if (!noIndentSet.contains(name.toLowerCase())) {
this.writer.indent(4);
}
this.writer.write("<%s", name);
}
/**
* Writes text content to the body of this element
* @param text the text content to write
* @return this element
*/
public HtmlElement text(String text) {
if (attrs) {
this.writer.write(">");
this.attrs = false;
}
final String[] lines = text.split("\n");
if (lines.length > 1) {
this.mixedContent = true;
this.writer.indent(4);
for (String line : lines) {
this.writer.newLine();
this.writer.write(line);
}
this.writer.unident(4);
} else {
this.writer.write(text);
}
return this;
}
/**
* Writes a new attribute key and value for the current element
* @param name the attribute name
* @param value the attribute value
* @return this element
*/
public HtmlElement newAttribute(String name, String value) {
if (!attrs) {
throw new IllegalStateException("The html element named " + name + " has already been closed");
} else {
this.writer.write(" %s=\"%s\"", name, value);
return this;
}
}
/**
* Writes a new child element content in this element
* @param name the child element name
* @param consumer the consumer to populate the child element
* @return this element
*/
public HtmlElement newElement(String name, Consumer consumer) {
if (attrs) {
this.writer.write(">");
this.attrs = false;
}
this.mixedContent = true;
final HtmlElement element = new HtmlElement(name, writer);
consumer.accept(element);
element.close();
return this;
}
/**
* Closes this element after all attributes and content has been written
* @return this element
*/
HtmlElement close() {
this.writer.write(!mixedContent ? ">" : "");
if (mixedContent && newLineSet.contains(name.toLowerCase())) {
this.writer.newLine();
}
this.writer.write("", name);
if (!noIndentSet.contains(name.toLowerCase())) {
this.writer.unident(4);
}
return this;
}
}