XML的元素, {@link #toString()}方法可以便捷的生成xml字符串

Element.java

package com.celink.common.common;

import android.util.Xml;

import org.xmlpull.v1.XmlSerializer;

import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

/**
 * XML的元素, {@link #toString()}方法可以便捷的生成xml字符串
 * Created by JiangSong on 2015/11/7.
 */
public class Element {
    private String name;
    private String text;
    private String namespace;
    private List<Prefix> prefixes = new ArrayList<>();
    private List<Attribute> attributes = new ArrayList<>();
    private List<Element> children = new ArrayList<>();
    /** 省略XML声明 */
    private boolean omitXmlDeclaration;
    /** 缩进输出 */
    private boolean indentOut;

    public Element(String name) {
        this.name = name;
    }

    public List<Prefix> getPrefixes() {
        return prefixes;
    }

    public List<Attribute> getAttributes() {
        return attributes;
    }

    public List<Element> getChildren() {
        return children;
    }

    public void addPrefix(String prefix, String namespace) {
        prefixes.add(new Prefix(prefix, namespace));
    }

    /**
     * 增加一个子元素
     * @param name tag名
     * @return
     */
    public Element newChild(String name) {
        Element child = new Element(name);
        addChild(child);
        return child;
    }

    public void addChild(Element element) {
        children.add(element);
    }

    public boolean removeChild(Element element) {
        return children.remove(element);
    }

    /**
     * 增加属性
     * @param namespace
     * @param name
     * @param value
     */
    public void addAttribute(String namespace, String name, String value) {
        attributes.add(new Attribute(namespace, name, value));
    }

    public String getName() {
        return name;
    }

    public String getNamespace() {
        return namespace;
    }

    public void setNamespace(String namespace) {
        this.namespace = namespace;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    protected void asXml(XmlSerializer xml) throws IOException {
        for (Prefix prefix : prefixes) {
            xml.setPrefix(prefix.prefix, prefix.namespace);
        }
        xml.startTag(namespace, name);
        for (Attribute attribute : attributes) {
            xml.attribute(attribute.namespace, attribute.name, attribute.value);
        }
        if (text != null) {
            xml.text(text);
        }
        for (Element child : children) {
            child.asXml(xml);
        }
        xml.endTag(namespace, name);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Element element = (Element) o;

        if (name != null ? !name.equals(element.name) : element.name != null) return false;
        return !(namespace != null ? !namespace.equals(element.namespace) : element.namespace != null);

    }

    @Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (namespace != null ? namespace.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        try {
            StringWriter writer = new StringWriter();
            XmlSerializer xml = Xml.newSerializer();
            xml.setOutput(writer);
            if (!omitXmlDeclaration) {
                xml.startDocument("utf-8", null);
            }
            if (indentOut) {
                xml.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
            }
            asXml(xml);
            xml.endDocument();
            return writer.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

    public boolean isOmitXmlDeclaration() {
        return omitXmlDeclaration;
    }

    public void setOmitXmlDeclaration(boolean omitXmlDeclaration) {
        this.omitXmlDeclaration = omitXmlDeclaration;
    }

    public boolean isIndentOut() {
        return indentOut;
    }

    public void setIndentOut(boolean indentOut) {
        this.indentOut = indentOut;
    }

    /**
     * 前缀
     */
    public static class Prefix {
        public final String prefix;
        public final String namespace;

        public Prefix(String prefix, String namespace) {
            this.prefix = prefix;
            this.namespace = namespace;
        }
    }

    /**
     * 属性
     */
    public static class Attribute {
        public final String namespace;
        public final String name;
        public final String value;

        public Attribute(String namespace, String name, String value) {
            this.namespace = namespace;
            this.name = name;
            this.value = value;
        }
    }

}