| /* |
| * 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.afp.util; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.fop.apps.io.InternalResourceResolver; |
| |
| /** |
| * Defines an interface through which external resource objects can be accessed. |
| */ |
| public final class AFPResourceAccessor { |
| |
| private static final Log log = LogFactory.getLog(AFPResourceAccessor.class); |
| |
| private final InternalResourceResolver resourceResolver; |
| private final URI baseURI; |
| private final URIResolver uriResolver; |
| |
| /** |
| * Constructor for resource to be accessed via the {@link org.apache.fop.apps.FOUserAgent}. This |
| * contructor takes a base URI for resolving font resource URIs. So, if fonts need to be |
| * accessed, you can set the {@link org.apache.fop.fonts.FontManager}'s base URI instead of the |
| * one on the {@link org.apache.fop.apps.FopFactory}. |
| * |
| * @param resourceResolver the resolver of resources |
| * @param baseURI the custom base URI to resolve relative URIs against (may be null) |
| */ |
| public AFPResourceAccessor(InternalResourceResolver resourceResolver, String baseURI) { |
| this.resourceResolver = resourceResolver; |
| URI actualBaseURI = null; |
| URIResolver uriResolver; |
| if (baseURI == null) { |
| actualBaseURI = null; |
| uriResolver = new NullBaseURIResolver(); |
| } else { |
| try { |
| actualBaseURI = InternalResourceResolver.getBaseURI(baseURI); |
| uriResolver = new BaseURIResolver(); |
| } catch (URISyntaxException use) { |
| log.error("The URI given \"" + baseURI + "\" is invalid: " + use.getMessage()); |
| actualBaseURI = null; |
| uriResolver = new NullBaseURIResolver(); |
| } |
| } |
| this.baseURI = actualBaseURI; |
| this.uriResolver = uriResolver; |
| } |
| |
| /** |
| * Constructor for resource to be accessed via the {@link org.apache.fop.apps.FOUserAgent}. |
| * |
| * @param resourceResolver the resolver of resources |
| */ |
| public AFPResourceAccessor(InternalResourceResolver resourceResolver) { |
| this(resourceResolver, null); |
| } |
| |
| /** |
| * Creates an {@link InputStream} given a URI. |
| * |
| * @param uri the URI of the InputStream |
| * @return an InputStream |
| * @throws IOException if an I/O error occurs while creating the InputStream. |
| */ |
| public InputStream createInputStream(URI uri) throws IOException { |
| return resourceResolver.getResource(uriResolver.resolveURI(uri)); |
| } |
| |
| /** |
| * Returns the resolved URI, given the URI of a resource. |
| * |
| * @param uri the resource URI |
| * @return the resolved URI |
| */ |
| public URI resolveURI(String uri) { |
| return uriResolver.resolveURI(uri); |
| } |
| |
| private interface URIResolver { |
| URI resolveURI(URI uri); |
| |
| URI resolveURI(String uri); |
| } |
| |
| private static final class NullBaseURIResolver implements URIResolver { |
| |
| public URI resolveURI(URI uri) { |
| return uri; |
| } |
| |
| public URI resolveURI(String uri) { |
| return URI.create("./" + uri.trim()); |
| } |
| } |
| |
| private final class BaseURIResolver implements URIResolver { |
| |
| public URI resolveURI(URI uri) { |
| return baseURI.resolve(uri); |
| } |
| |
| public URI resolveURI(String uri) { |
| return baseURI.resolve(uri.trim()); |
| } |
| } |
| } |