org.wicketstuff.rest.resource.urlsegments.MultiParamSegment Maven / Gradle / Ivy

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/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.wicketstuff.rest.resource.urlsegments;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;

import org.apache.wicket.util.parse.metapattern.Group;
import org.apache.wicket.util.parse.metapattern.MetaPattern;
import org.wicketstuff.rest.resource.urlsegments.visitor.ISegmentVisitor;

/**
 * This kind of segment can contain more than one path parameter, for example
 * "/message-{day}-{month}-{year}/".
 * 
 * @author andrea del bene
 * 
 */
public class MultiParamSegment extends AbstractURLSegment
{
    private static final long serialVersionUID = 1L;

    private volatile List subSegments;

	MultiParamSegment(String text)
	{
		super(text);
	}

	/**
	 * Split the segment in input in sub segments like fixed segments ( {@link FixedURLSegment}) or
	 * parameter segments ({@link ParamSegment}).
	 * 
	 * @param text
	 *            the segment in input.
	 * @return the list of sub segments.
	 */
	private List loadSubSegments(String text)
	{
		Matcher matcher = SEGMENT_PARAMETER.matcher(text);
		List subSegments = new ArrayList();
		int fixedTextIndex = 0;

		while (matcher.find())
		{
			String group = matcher.group();
			AbstractURLSegment segment = AbstractURLSegment.newSegment(group);
			String fixedText = text.substring(fixedTextIndex, matcher.start());

			fixedTextIndex = matcher.end();

			if (!fixedText.isEmpty())
			{
				subSegments.add(AbstractURLSegment.newSegment(fixedText));
			}

			subSegments.add(segment);
		}

		if (fixedTextIndex < text.length())
		{
			String fixedText = text.substring(fixedTextIndex, text.length());
			subSegments.add(AbstractURLSegment.newSegment(fixedText));
		}

		return subSegments;
	}

	@Override
	protected MetaPattern loadMetaPattern()
	{
		List patterns = new ArrayList();

		this.subSegments = Collections.unmodifiableList(loadSubSegments(toString()));

		for (AbstractURLSegment segment : subSegments)
		{
			patterns.add(segment.getMetaPattern());
		}

		return new MetaPattern(patterns);
	}
	
	/**
	 * Returns segment meta pattern with regexp group to support named-capturing.
	 * 
	 * @return
	 * 		the meta pattern.
	 */
	public MetaPattern getMetaPatternWithGroups()
	{
		List patterns = new ArrayList();
		
		for (AbstractURLSegment segment : subSegments)
		{
			MetaPattern metaPattern = segment.getMetaPattern();

			if(segment instanceof ParamSegment)
			{
				metaPattern = new Group(metaPattern); 
			}
			
			patterns.add(metaPattern);			
		}

		return new MetaPattern(patterns);
	} 

	public List getSubSegments()
	{
		return subSegments;
	}
	
	@Override
	public void accept(ISegmentVisitor visitor)
	{
		visitor.visit(this);
	}
}