gisresourcemetadataregistry.java

esri的ArcGIS Server超级学习模板程序（for java）

/**
 * 
 */
package com.esri.solutions.jitk.common.metadata;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import com.esri.adf.web.data.GISResource;

/**
 * Implementation of {@link IResourceMetadataRegistry} that maps
 * {@link GISResource GISResources} to the {@link IMetadataID IMetadataIDs}
 * representing its metadata.
 */
public class GISResourceMetadataRegistry implements IResourceMetadataRegistry {

	/**
	 * Maps IMetadataIDs to the GISResource that they represent
	 */
	private Map<IMetadataID, GISResource> _registry = new HashMap<IMetadataID, GISResource>();

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#getGISResource(com.esri.solutions.jitk.common.metadata.IMetadataID)
	 */
	public GISResource getGISResource(IMetadataID id) {
		if (id == null) {
			throw new NullPointerException("id cannot be null");
		}
		return _registry.get(id);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#getMetadataID(com.esri.adf.web.data.GISResource)
	 */
	public IMetadataID getMetadataID(GISResource resource) {
		if (resource == null) {
			throw new NullPointerException("resource cannot be null");
		}
		IMetadataID theID = null;
		boolean notFound = true;
		Iterator<IMetadataID> keyIterator = _registry.keySet().iterator();
		while (notFound && keyIterator.hasNext()) {
			IMetadataID currentID = keyIterator.next();
			GISResource currentResource = _registry.get(currentID);
			if (currentResource != null) {
				if (currentResource.equals(resource)) {
					theID = currentID;
					notFound = false;
				}
			}
		}
		return theID;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#metadataExists(com.esri.solutions.jitk.common.metadata.IMetadataID)
	 */
	public boolean metadataExists(IMetadataID id) {
		if (id == null) {
			throw new NullPointerException("id cannot be null");
		}
		return _registry.containsKey(id);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#metadataExists(com.esri.adf.web.data.GISResource)
	 */
	public boolean metadataExists(GISResource resource) {
		if (resource == null) {
			throw new NullPointerException("resource cannot be null");
		}
		return _registry.containsValue(resource);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#register(com.esri.solutions.jitk.common.metadata.IMetadataID,
	 *      com.esri.adf.web.data.GISResource)
	 */
	public void register(IMetadataID id, GISResource resource) {
		if (id == null) {
			throw new NullPointerException("id cannot be null");
		}
		if (resource == null) {
			throw new NullPointerException("resource cannot be null");
		}
		// Remove the entry for the specified ID
		unregister(id);
		// Get the ID for the GIS Resource represented by "resource", just in
		// case it differs from that specified by ID
		unregister(resource);
		// (Re)register the resource
		_registry.put(id, resource);

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#unregister(com.esri.solutions.jitk.common.metadata.IMetadataID)
	 */
	public void unregister(IMetadataID id) {
		if (id == null) {
			throw new NullPointerException("id cannot be null");
		}
		// Remove the entry for the specified ID
		_registry.remove(id);

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#unregister(com.esri.adf.web.data.GISResource)
	 */
	public void unregister(GISResource resource) {
		if (resource == null) {
			throw new NullPointerException("resource cannot be null");
		}
		// Get the ID for the GISResource represented by "resource"
		IMetadataID resourceID = getMetadataID(resource);
		// Remove the entry if one was found
		if (resourceID != null) {
			_registry.remove(resourceID);
		}
	}

	/* (non-Javadoc)
	 * @see com.esri.solutions.jitk.common.metadata.IResourceMetadataRegistry#setRegistry(java.util.Map)
	 */
	public void setRegistry(Map<IMetadataID, GISResource> registry) {
		if (registry == null) {
			throw new NullPointerException("registry cannot be null");
		}
		_registry.putAll(registry);
	}

}