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/*
 * Copyright 2002-2013 the original author or authors.
 *
 * 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.springframework.scripting.support;

import java.io.IOException;
import java.io.Reader;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.core.io.Resource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.scripting.ScriptSource;
import org.springframework.util.Assert;
import org.springframework.util.FileCopyUtils;
import org.springframework.util.StringUtils;

/**
 * {@link org.springframework.scripting.ScriptSource} implementation
 * based on Spring's {@link org.springframework.core.io.Resource}
 * abstraction. Loads the script text from the underlying Resource's
 * {@link org.springframework.core.io.Resource#getFile() File} or
 * {@link org.springframework.core.io.Resource#getInputStream() InputStream},
 * and tracks the last-modified timestamp of the file (if possible).
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.0
 * @see org.springframework.core.io.Resource#getInputStream()
 * @see org.springframework.core.io.Resource#getFile()
 * @see org.springframework.core.io.ResourceLoader
 */
public class ResourceScriptSource implements ScriptSource {

	/** Logger available to subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	private EncodedResource resource;

	private long lastModified = -1;

	private final Object lastModifiedMonitor = new Object();


	/**
	 * Create a new ResourceScriptSource for the given resource.
	 * @param resource the EncodedResource to load the script from
	 */
	public ResourceScriptSource(EncodedResource resource) {
		Assert.notNull(resource, "Resource must not be null");
		this.resource = resource;
	}

	/**
	 * Create a new ResourceScriptSource for the given resource.
	 * @param resource the Resource to load the script from (using UTF-8 encoding)
	 */
	public ResourceScriptSource(Resource resource) {
		Assert.notNull(resource, "Resource must not be null");
		this.resource = new EncodedResource(resource, "UTF-8");
	}


	/**
	 * Return the {@link org.springframework.core.io.Resource} to load the
	 * script from.
	 */
	public final Resource getResource() {
		return this.resource.getResource();
	}

	/**
	 * Set the encoding used for reading the script resource.
	 * 

The default value for regular Resources is "UTF-8". * A {@code null} value implies the platform default. */ public void setEncoding(String encoding) { this.resource = new EncodedResource(this.resource.getResource(), encoding); } @Override public String getScriptAsString() throws IOException { synchronized (this.lastModifiedMonitor) { this.lastModified = retrieveLastModifiedTime(); } Reader reader = this.resource.getReader(); return FileCopyUtils.copyToString(reader); } @Override public boolean isModified() { synchronized (this.lastModifiedMonitor) { return (this.lastModified < 0 || retrieveLastModifiedTime() > this.lastModified); } } /** * Retrieve the current last-modified timestamp of the underlying resource. * @return the current timestamp, or 0 if not determinable */ protected long retrieveLastModifiedTime() { try { return getResource().lastModified(); } catch (IOException ex) { if (logger.isDebugEnabled()) { logger.debug(getResource() + " could not be resolved in the file system - " + "current timestamp not available for script modification check", ex); } return 0; } } @Override public String suggestedClassName() { return StringUtils.stripFilenameExtension(getResource().getFilename()); } @Override public String toString() { return this.resource.toString(); } }





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