com.github.ferstl.depgraph.graph.dot.DotAttributeBuilder.java Source code

Introduction

Here is the source code for com.github.ferstl.depgraph.graph.dot.DotAttributeBuilder.java

Source

/*
 * Copyright (c) 2014 - 2017 the original author or authors.
 *
 * 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.github.ferstl.depgraph.graph.dot;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.commons.lang3.StringUtils;

import static com.github.ferstl.depgraph.graph.dot.DotEscaper.escape;

public class DotAttributeBuilder {

    private final Map<String, String> attributes;

    public DotAttributeBuilder() {
        this.attributes = new LinkedHashMap<>();
    }

    public DotAttributeBuilder label(String label) {
        if (StringUtils.startsWith(label, "<") && StringUtils.endsWith(label, ">")) {
            this.attributes.put("label", label);
            return this;
        }

        return addAttribute("label", label);
    }

    public DotAttributeBuilder fontName(String fontName) {
        return addAttribute("fontname", fontName);
    }

    public DotAttributeBuilder fontSize(int fontSize) {
        if (fontSize > 0) {
            return addAttribute("fontsize", Integer.toString(fontSize));
        } else if (fontSize < 0) {
            throw new IllegalArgumentException("Negative font size");
        }

        return this;
    }

    public DotAttributeBuilder fontSize(Integer fontSize) {
        return fontSize(fontSize != null ? fontSize : 0);
    }

    public DotAttributeBuilder fontColor(String color) {
        return addAttribute("fontcolor", color);
    }

    public DotAttributeBuilder style(String style) {
        return addAttribute("style", style);
    }

    public DotAttributeBuilder color(String color) {
        return addAttribute("color", color);
    }

    public DotAttributeBuilder fillColor(String color) {
        return addAttribute("fillcolor", color);
    }

    public DotAttributeBuilder shape(String shape) {
        return addAttribute("shape", shape);
    }

    public DotAttributeBuilder rankdir(String rankdir) {
        return addAttribute("rankdir", rankdir);
    }

    public DotAttributeBuilder addAttribute(String key, String value) {
        if (value != null) {
            this.attributes.put(key, escape(value));
        }
        return this;
    }

    public boolean isEmpty() {
        return this.attributes.isEmpty();
    }

    @Override
    public String toString() {
        if (this.attributes.isEmpty()) {
            return "";
        }

        StringBuilder sb = new StringBuilder("[");
        for (Entry<String, String> attribute : this.attributes.entrySet()) {
            sb.append(attribute.getKey()).append("=").append(attribute.getValue()).append(",");
        }

        return sb.delete(sb.length() - 1, sb.length()).append("]").toString();
    }
}