| /* |
| * 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.apache.lenya.cms.cocoon.components.modules.input; |
| |
| import java.io.File; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.avalon.framework.configuration.Configuration; |
| import org.apache.avalon.framework.configuration.ConfigurationException; |
| import org.apache.excalibur.source.Source; |
| import org.apache.excalibur.source.SourceResolver; |
| import org.apache.excalibur.source.SourceUtil; |
| |
| /** |
| * <p> |
| * This module checks if a file exists in a publiation, and if not, it chooses the core file. The |
| * attribute name must a path relatively to the <code>webapps/lenya/lenya</code> directory. |
| * </p> |
| * <p> |
| * Example: <code>{fallback:xslt/style.xsl}</code> looks if |
| * <code>lenya/pubs/(publication-id)/lenya/xslt/style.xsl</code> exists, and if not, it uses |
| * <code>lenya/xslt/style.xsl</code>. |
| * |
| * @version $Id$ |
| */ |
| public class FallbackModule extends AbstractPageEnvelopeModule { |
| |
| private String[] baseUris; |
| |
| /** |
| * <code>PATH_PREFIX</code> The path prefix from the webapp |
| */ |
| public static final String PATH_PREFIX = "lenya/"; |
| |
| protected static final String ELEMENT_PATH = "directory"; |
| |
| protected static final String ATTRIBUTE_SRC = "src"; |
| |
| /** |
| * @see org.apache.avalon.framework.configuration.Configurable#configure(org.apache.avalon.framework.configuration.Configuration) |
| */ |
| public void configure(Configuration conf) throws ConfigurationException { |
| super.configure(conf); |
| |
| Configuration[] pathConfigs = conf.getChildren(ELEMENT_PATH); |
| List baseUriList = new ArrayList(); |
| |
| SourceResolver resolver = null; |
| try { |
| resolver = (SourceResolver) this.manager.lookup(SourceResolver.ROLE); |
| Source source = null; |
| for (int i = 0; i < pathConfigs.length; i++) { |
| String uri = pathConfigs[i].getAttribute(ATTRIBUTE_SRC); |
| try { |
| source = resolver.resolveURI(uri); |
| if (source.exists()) { |
| File file = SourceUtil.getFile(source); |
| if (file.isDirectory()) { |
| baseUriList.add(uri); |
| } else { |
| getLogger().warn("Omitting path [" + uri + "] (not a directory)."); |
| } |
| } else { |
| getLogger().warn("Omitting path [" + uri + "] (does not exist)."); |
| } |
| } catch (Exception e) { |
| getLogger().error("Could not resolve path [" + uri + "]: ", e); |
| throw e; |
| } finally { |
| if (source != null) { |
| resolver.release(source); |
| } |
| } |
| } |
| } catch (Exception e) { |
| throw new ConfigurationException("Configuring failed: ", e); |
| } finally { |
| if (resolver != null) { |
| this.manager.release(resolver); |
| } |
| } |
| |
| this.baseUris = (String[]) baseUriList.toArray(new String[baseUriList.size()]); |
| } |
| |
| /** |
| * @see org.apache.cocoon.components.modules.input.InputModule#getAttribute(java.lang.String, |
| * org.apache.avalon.framework.configuration.Configuration, java.util.Map) |
| */ |
| public Object getAttribute(String name, Configuration modeConf, Map objectModel) |
| throws ConfigurationException { |
| |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Resolving file for path [" + name + "]"); |
| } |
| |
| String resolvedUri = resolveURI(name, objectModel); |
| return resolvedUri; |
| } |
| |
| /** |
| * Resolves the URI for a certain path. |
| * @param path The path. |
| * @param objectModel The object model. |
| * @return A string. |
| * @throws ConfigurationException if an error occurs. |
| */ |
| protected String resolveURI(final String path, Map objectModel) throws ConfigurationException { |
| String resolvedUri = null; |
| String checkedUris = "\n"; |
| |
| SourceResolver resolver = null; |
| try { |
| resolver = (SourceResolver) this.manager.lookup(SourceResolver.ROLE); |
| |
| String[] _baseUris = getBaseURIs(objectModel, path); |
| Source source = null; |
| int i = 0; |
| while (resolvedUri == null && i < _baseUris.length) { |
| String uri = _baseUris[i] + "/" + path; |
| |
| checkedUris += uri + "\n"; |
| |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Trying to resolve URI [" + uri + "]"); |
| } |
| |
| try { |
| source = resolver.resolveURI(uri); |
| if (source.exists()) { |
| resolvedUri = uri; |
| } else { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Skipping URI [" + uri + "] (does not exist)."); |
| } |
| } |
| } catch (Exception e) { |
| getLogger().error("Could not resolve URI [" + uri + "]: ", e); |
| throw e; |
| } finally { |
| if (source != null) { |
| resolver.release(source); |
| } |
| } |
| i++; |
| } |
| |
| } catch (Exception e) { |
| throw new ConfigurationException("Resolving attribute [" + path + "] failed: ", e); |
| } finally { |
| if (resolver != null) { |
| this.manager.release(resolver); |
| } |
| } |
| |
| if (resolvedUri == null) { |
| /* |
| throw new ConfigurationException("Could not resolve file for path [" + path + "]." |
| + "\nChecked URIs:" + checkedUris); |
| */ |
| resolvedUri = this.baseUris[this.baseUris.length - 1] + "/" + path; |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("No URI resolved, choosing last defined URI: [" + resolvedUri + "]"); |
| } |
| } |
| else { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Resolved URI: [" + resolvedUri + "]"); |
| } |
| } |
| return resolvedUri; |
| } |
| |
| /** |
| * Returns the base directory URIs in the order they should be traversed. |
| * @param objectModel The object model. |
| * @param attributeName The name of the module attribute. |
| * @return An array of strings. |
| * @throws ConfigurationException if an error occurs. |
| */ |
| protected String[] getBaseURIs(Map objectModel, String attributeName) throws ConfigurationException { |
| return this.baseUris; |
| } |
| |
| /** |
| * @see org.apache.cocoon.components.modules.input.InputModule#getAttributeNames(org.apache.avalon.framework.configuration.Configuration, |
| * java.util.Map) |
| */ |
| public Iterator getAttributeNames(Configuration modeConf, Map objectModel) |
| throws ConfigurationException { |
| return Collections.EMPTY_SET.iterator(); |
| } |
| |
| /** |
| * @see org.apache.cocoon.components.modules.input.InputModule#getAttributeValues(java.lang.String, |
| * org.apache.avalon.framework.configuration.Configuration, java.util.Map) |
| */ |
| public Object[] getAttributeValues(String name, Configuration modeConf, Map objectModel) |
| throws ConfigurationException { |
| Object[] objects = { getAttribute(name, modeConf, objectModel) }; |
| |
| return objects; |
| } |
| |
| } |