/*******************************************************************************
 * Copyright (c) 2010 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.contentassist;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * <p>There should be one context for each content type. It keeps track
 * of the describers associated with different partition types for its unique
 * content type.</p>
 */
public class CompletionProposalContentTypeContext {

	/** the content type this context is associated with */
	private final String fContentTypeID;
	
	/**
	 * 
	 * <code>{@link Map}&lt{@link String}, {@link Set}&lt{@link CompletionProposalComputerDescriptor}&gt&gt</code>
	 * <ul>
	 * <li><b>key:</b> partition type ID</li>
	 * <li><b>value:</b> {@link Set} of associated computer descriptors</li>
	 * </ul>
	 */
	private Map fPartitionTypesToDescriptors;
	
	/**
	 * <p>Create a new context for the given content type ID.</p>
	 * <p>There should only ever be one context for any unique content type</p>
	 * @param contentTypeID the content type this context is for
	 */
	public CompletionProposalContentTypeContext(String contentTypeID) {
		this.fContentTypeID = contentTypeID;
		this.fPartitionTypesToDescriptors = new HashMap();
	}
	
	/**
	 * <p>Adds a describer to this context for a given partition type.  There
	 * can be more then one describer for one partition type.</p>
	 * 
	 * @param partitionTypeID the partition type to associate the given descriptor with
	 * @param descriptor {@link CompletionProposalComputerDescriptor} to associate with the given
	 * partition type in this context
	 */
	public void putDescriptor(String partitionTypeID, CompletionProposalComputerDescriptor descriptor) {
		Set descriptors = (Set)this.fPartitionTypesToDescriptors.get(partitionTypeID);
		if(descriptors != null) {
			descriptors.add(descriptor);
		} else {
			descriptors = new HashSet();
			descriptors.add(descriptor);
			this.fPartitionTypesToDescriptors.put(partitionTypeID, descriptors);
		}
	}
	
	/**
	 * @return All of the {@link CompletionProposalComputerDescriptor}s associated with
	 * any partition type in this context
	 */
	public Set getDescriptors() {
		Set allDescriptors = new HashSet();
		Collection descriptorSets = this.fPartitionTypesToDescriptors.values();
		Iterator iter = descriptorSets.iterator();
		while(iter.hasNext()) {
			Set descriptorSet = (Set)iter.next();
			allDescriptors.addAll(descriptorSet);
		}
		
		return Collections.unmodifiableSet(allDescriptors);
	}
	
	/**
	 * @param partitionTypeID get {@link CompletionProposalComputerDescriptor}s for only this partition type
	 * for this context
	 * @return {@link CompletionProposalComputerDescriptor}s assoicated with the given partition type
	 * in this context
	 */
	public Set getDescriptors(String partitionTypeID) {
		Set descriptors = (Set)this.fPartitionTypesToDescriptors.get(partitionTypeID);
		return descriptors != null ? Collections.unmodifiableSet(descriptors) : Collections.EMPTY_SET;
	}
	
	/**
	 * @return the content type this context is for
	 */
	public String getContentTypeID() {
		return fContentTypeID;
	}
	
	/**
	 * @return the hash code of the content type ID
	 * 
	 * @see java.lang.Object#hashCode()
	 */
	public int hashCode() {
		return fContentTypeID.hashCode();
	}
	
	/**
	 * <p>Two {@link CompletionProposalContentTypeContext} are equal if they have the
	 * same content type ID.</p>
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object obj) {
		boolean equal = false;
		if(obj instanceof CompletionProposalContentTypeContext) {
			equal = this.fContentTypeID.equals(((CompletionProposalContentTypeContext)obj).fContentTypeID);
		}
		
		return equal;
	}
	
	/**
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		StringBuffer buff = new StringBuffer(this.fContentTypeID);
		Set partitions = this.fPartitionTypesToDescriptors.keySet();
		Iterator partitionsIter = partitions.iterator();
		while(partitionsIter.hasNext()) {
			String partitionType = (String)partitionsIter.next();
			buff.append("\n\t" + partitionType); //$NON-NLS-1$
			List descriptors = (List)this.fPartitionTypesToDescriptors.get(partitionType);
			for(int i = 0; i < descriptors.size(); ++i) {
				buff.append("\n\t\t" + descriptors.get(i).toString()); //$NON-NLS-1$
			}
		}
		
		return buff.toString();
	}
}