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/*
 *  Copyright 2008 biaoping.yin
 *
 *  Licensed 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.frameworkset.util.io;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.frameworkset.util.SystemPropertyUtils;

import com.frameworkset.util.EditorInf;

/**
 * Title: ResourceArrayPropertyEditor.java 
 * Description: 
 * bboss workgroup
 * Copyright (c) 2008
 * @Date 2010-10-14
 * @author biaoping.yin
 * @version 1.0
 */
public class ResourceArrayPropertyEditor   implements EditorInf{

	private final ResourcePatternResolver resourcePatternResolver;


	/**
	 * Create a new ResourceArrayPropertyEditor with a default
	 * PathMatchingResourcePatternResolver.
	 * @see PathMatchingResourcePatternResolver
	 */
	public ResourceArrayPropertyEditor() {
		this.resourcePatternResolver = new PathMatchingResourcePatternResolver();
	}

	/**
	 * Create a new ResourceArrayPropertyEditor with the given ResourcePatternResolver.
	 * @param resourcePatternResolver the ResourcePatternResolver to use
	 */
	public ResourceArrayPropertyEditor(ResourcePatternResolver resourcePatternResolver) {
		this.resourcePatternResolver = resourcePatternResolver;
	}


	

	/**
	 * Resolve the given path, replacing placeholders with
	 * corresponding system property values if necessary.
	 * @param path the original file path
	 * @return the resolved file path

	 */
	protected String resolvePath(String path) {
		return SystemPropertyUtils.resolvePlaceholders(path);
	}

	public Resource[] getValueFromObject(Object value) {
		if (value instanceof Collection || (value instanceof Object[] && !(value instanceof Resource[]))) {
			Collection input = (value instanceof Collection ? (Collection) value : Arrays.asList((Object[]) value));
			List merged = new ArrayList();
			for (Iterator it = input.iterator(); it.hasNext();) {
				Object element = it.next();
				if (element instanceof String) {
					// A location pattern: resolve it into a Resource array.
					// Might point to a single resource or to multiple resources.
					String pattern = resolvePath((String) element).trim();
					try {
						Resource[] resources = this.resourcePatternResolver.getResources(pattern);
						for (int i = 0; i < resources.length; i++) {
							Resource resource = resources[i];
							if (!merged.contains(resource)) {
								merged.add(resource);
							}
						}
					}
					catch (IOException ex) {
						throw new IllegalArgumentException(
								"Could not resolve resource location pattern [" + pattern + "]: " + ex.getMessage());
					}
				}
				else if (element instanceof Resource) {
					// A Resource object: add it to the result.
					if (!merged.contains(element)) {
						merged.add(element);
					}
				}
				else {
					throw new IllegalArgumentException("Cannot convert element [" + element + "] to [" +
							Resource.class.getName() + "]: only location String and Resource object supported");
				}
			}
			return (Resource[])(merged.toArray(new Resource[merged.size()]));
		}

		else {
			// An arbitrary value: probably a String or a Resource array.
			// setAsText will be called for a String; a Resource array will be used as-is.
			if(value instanceof Resource[])
				return (Resource[])(value);
			else
				return getValueFromString(String.valueOf(value));
		}
	}

	public Resource[] getValueFromString(String text) {
		String pattern = resolvePath(text).trim();
		try {
			return (this.resourcePatternResolver.getResources(pattern));
		}
		catch (IOException ex) {
			throw new IllegalArgumentException(
			    "Could not resolve resource location pattern [" + pattern + "]: " + ex.getMessage());
		}
	}


}