listmaptemplaterepository.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.common.templates.map;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Implementation of a Map Template Repository that uses a List of
 * Map Template objects for the Repository.  This implementation
 * will allow a list of Map Template objects to be injected via
 * {@link #setMapTemplates(List)}.  This implementation will also
 * build an index between the Map Template ID and the Map Template
 * object in order to speed up the {@link #getMapTemplate(String)}
 * operation.
 * 
 * <p>
 * This implementation is only to be used in deployments where 
 * there aren't many Map Templates.
 * </p>
 */
public class ListMapTemplateRepository implements IMapTemplateRepository {

	/**
	 * List of Map Templates.
	 */
	private final List<IMapTemplate> m_templates;
	
	/**
	 * Index between a Map Template ID and the Map Template object.
	 */
	private final Map<String, IMapTemplate> m_idMap;
	
	/**
	 * Constructs a new <code>ListMapTemplateRepository</code>.
	 */
	public ListMapTemplateRepository () {
		m_templates = new ArrayList<IMapTemplate>();
		m_idMap = new HashMap<String, IMapTemplate>();
	}
	
	/*
	 * (non-Javadoc)
	 * @see com.esri.solutions.jitk.common.templates.map.IMapTemplateRepository#getMapTemplate(java.lang.String)
	 */
	public IMapTemplate getMapTemplate(String id) {
		//return m_idMap.get(id);
		if (id == null) {
			return null;
		}
		for (IMapTemplate template : m_templates) {
			if (id.equals(template.getId())) {
				return template;
			}
		}
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see com.esri.solutions.jitk.common.templates.map.IMapTemplateRepository#getMapTemplateCount()
	 */
	public int getMapTemplateCount() {
		return m_templates.size();
	}

	/*
	 * (non-Javadoc)
	 * @see com.esri.solutions.jitk.common.templates.map.IMapTemplateRepository#getMapTemplates()
	 */
	public List<IMapTemplate> getMapTemplates() {
		//return new ArrayList<IMapTemplate>(m_templates);
		return m_templates;
	}

	/*
	 * (non-Javadoc)
	 * @see com.esri.solutions.jitk.common.templates.map.IMapTemplateRepository#getMapTemplates(com.esri.solutions.jitk.common.templates.map.PageInfo)
	 */
	public List<IMapTemplate> getMapTemplates(PageInfo page) {
		int pageIndex = page.getPage();
		int pageSize = page.getPageSize();
		int start = Math.max(0, pageIndex * pageSize);
		int end = Math.max(m_templates.size() - 1, start + pageSize - 1);
		
		return new ArrayList<IMapTemplate>(m_templates.subList(start, end));
	}

	/**
	 * Sets the List of Map Templates for this Repository.  This method
	 * will store the references to the Map Templates as well as 
	 * build an index between the Map Template ID and the Map Template
	 * object for easy retrieval.
	 * 
	 * @param templates List of Map Templates, cannot be <code>null</code>.
	 * @throws NullPointerException		Thrown if the templates argument
	 * 									is <code>null</code>.
	 */
	public void setMapTemplates (List<IMapTemplate> templates) {
		if (templates == null) {
			throw new NullPointerException ();
		}
		
		synchronized (m_templates) {
			m_templates.clear();
			m_templates.addAll(templates);
		}
		
		synchronized (m_idMap) {
			for (IMapTemplate t : m_templates) {
				t.setRepository(this);
				m_idMap.put(t.getId(), t);
			}
		}
	}
}