atts.java

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/*  Sesame - Storage and Querying architecture for RDF and RDF Schema
 *  Copyright (C) 2001-2005 Aduna
 *
 *  Contact: 
 *  	Aduna
 *  	Prinses Julianaplein 14 b
 *  	3817 CS Amersfoort
 *  	The Netherlands
 *  	tel. [phone]
 *  	fax. [phone]
 *
 *  	http://aduna.biz/
 *  	http://www.openrdf.org/
 *  
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.openrdf.rio.rdfxml;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * A collection of XML attributes.
 **/
class Atts {

/*------------------------------------------------------+
| Variables                                             |
+------------------------------------------------------*/

	/**
	 * List containing Att objects.
	 **/
	private List _attributes;

/*------------------------------------------------------+
| Constructors                                          |
+------------------------------------------------------*/

	/**
	 * Creates a new <tt>Atts</tt> object.
	 **/
	public Atts() {
		this(4);
	}

	/**
	 * Creates a new <tt>Atts</tt> object.
	 *
	 * @param size The initial size of the array for storing attributes.
	 **/
	public Atts(int size) {
		_attributes = new ArrayList(size);
	}

/*------------------------------------------------------+
| Methods                                               |
+------------------------------------------------------*/

	/**
	 * Adds an attribute.
	 **/
	public void addAtt(Att att) {
		_attributes.add(att);
	}

	/**
	 * Get an iterator on the attributes.
	 * @return an Iterator over Att objects.
	 **/
	public Iterator iterator() {
		return _attributes.iterator();
	}

	/**
	 * Gets the attribute with the specified QName.
	 *
	 * @param qName The QName of an attribute.
	 * @return The attribute with the specified QName, or
	 * <tt>null</tt> if no such attribute could be found.
	 **/
	public Att getAtt(String qName) {
		for (int i = 0; i < _attributes.size(); i++) {
			Att att = (Att)_attributes.get(i);

			if (att.getQName().equals(qName)) {
				return att;
			}
		}

		return null;
	}

	/**
	 * Gets the attribute with the specified namespace and local name.
	 *
	 * @param namespace The namespace of an attribute.
	 * @param localName The local name of an attribute.
	 * @return The attribute with the specified namespace and local
	 * name, or <tt>null</tt> if no such attribute could be found.
	 **/
	public Att getAtt(String namespace, String localName) {
		for (int i = 0; i < _attributes.size(); i++) {
			Att att = (Att)_attributes.get(i);

			if (att.getLocalName().equals(localName) &&
				att.getNamespace().equals(namespace))
			{
				return att;
			}
		}

		return null;
	}

	/**
	 * Removes the attribute with the specified QName and returns it.
	 *
	 * @param qName The QName of an attribute.
	 * @return The removed attribute, or <tt>null</tt> if no attribute
	 * with the specified QName could be found.
	 **/
	public Att removeAtt(String qName) {
		for (int i = 0; i < _attributes.size(); i++) {
			Att att = (Att)_attributes.get(i);

			if (att.getQName().equals(qName)) {
				_attributes.remove(i);
				return att;
			}
		}

		return null;
	}

	/**
	 * Removes the attribute with the specified namespace and local
	 * name and returns it.
	 *
	 * @param namespace The namespace of an attribute.
	 * @param localName The local name of an attribute.
	 * @return The removed attribute, or <tt>null</tt> if no attribute
	 * with the specified namespace and local name could be found.
	 **/
	public Att removeAtt(String namespace, String localName) {
		for (int i = 0; i < _attributes.size(); i++) {
			Att att = (Att)_attributes.get(i);

			if (att.getLocalName().equals(localName) &&
				att.getNamespace().equals(namespace))
			{
				_attributes.remove(i);
				return att;
			}
		}

		return null;
	}

	/**
	 * Returns the number of attributes contained in this object.
	 **/
	public int size() {
		return _attributes.size();
	}

	/**
	 * Produces a String-representation of this object.
	 **/
	public String toString() {
		StringBuffer result = new StringBuffer();
		result.append("Atts[");
		for (int i = 0; i < _attributes.size(); i++) {
			Att att = (Att)_attributes.get(i);
			result.append(att.getQName());
			result.append("=");
			result.append(att.getValue());
			result.append("; ");
		}
		result.append("]");
		return result.toString();
	}
}