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Android-specific components of FlowDroid

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package soot.jimple.infoflow.android.axml;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Class representing a document in the Android XML format
 * 
 * @author Steven Arzt
 */
public class AXmlDocument {

	/**
	 * The root node of the document
	 */
	private AXmlNode rootNode;

	/**
	 * The namespaces registered on this element.
	 */
	Map namespaces = null;

	/**
	 * Gets the root node of this Android XML document
	 * 
	 * @return The root node of this Android XML document
	 */
	public AXmlNode getRootNode() {
		return this.rootNode;
	}

	/**
	 * Sets the root node of this document
	 * 
	 * @param rootNode The new root node of this document
	 */
	public void setRootNode(AXmlNode rootNode) {
		this.rootNode = rootNode;
	}

	/**
	 * Adds a namespace that is defined in this node.
	 * 
	 * @param ns The namespace defined in this node.
	 */
	public void addNamespace(AXmlNamespace ns) {
		// Do not add the default namespace
		if (ns.getUri() == null || ns.getUri().isEmpty())
			return;

		if (this.namespaces == null)
			this.namespaces = new HashMap();
		this.namespaces.put(ns.getPrefix(), ns);
	}

	/**
	 * Gets all namespaces registered in this document
	 * 
	 * @return A collection of all namespaces registered in this document
	 */
	public Collection getNamespaces() {
		return this.namespaces == null ? Collections.emptySet() : this.namespaces.values();
	}

}