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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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.apps.io;
-
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.OutputStream;
- import java.net.URI;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.Map;
-
- /**
- * A factory class for {@link ResourceResolver}s.
- */
- public final class ResourceResolverFactory {
-
- private ResourceResolverFactory() {
- }
-
- /**
- * Returns the default resource resolver, this is most basic resolver which can be used when
- * no there are no I/O or file access restrictions.
- *
- * @return the default resource resolver
- */
- public static ResourceResolver createDefaultResourceResolver() {
- return DefaultResourceResolver.INSTANCE;
- }
-
- /**
- * A helper merthod that creates an internal resource resolver using the default resover:
- * {@link ResourceResolverFactory#createDefaultResourceResolver()}.
- *
- * @param baseURI the base URI from which to resolve URIs
- * @return the default internal resource resolver
- */
- public static InternalResourceResolver createDefaultInternalResourceResolver(URI baseURI) {
- return new InternalResourceResolver(baseURI, createDefaultResourceResolver());
- }
-
- /**
- * Creates an interal resource resolver given a base URI and a resource resolver.
- *
- * @param baseURI the base URI from which to resolve URIs
- * @param resolver the resource resolver
- * @return the internal resource resolver
- */
- public static InternalResourceResolver createInternalResourceResolver(URI baseURI,
- ResourceResolver resolver) {
- return new InternalResourceResolver(baseURI, resolver);
- }
-
- /**
- * Creates a temporary-resource-schema aware resource resolver. Temporary resource URIs are
- * created by {@link TempResourceURIGenerator}.
- *
- * @param tempResourceResolver the temporary-resource-schema resolver to use
- * @param defaultResourceResolver the default resource resolver to use
- * @return the ressource resolver
- */
- public static ResourceResolver createTempAwareResourceResolver(
- TempResourceResolver tempResourceResolver,
- ResourceResolver defaultResourceResolver) {
- return new TempAwareResourceResolver(tempResourceResolver, defaultResourceResolver);
- }
-
- public static SchemaAwareResourceResolverBuilder createSchemaAwareResourceResolverBuilder(
- ResourceResolver defaultResolver) {
- return new SchemaAwareResourceResolverBuilderImpl(defaultResolver);
- }
-
- private static final class DefaultResourceResolver implements ResourceResolver {
-
- private static final ResourceResolver INSTANCE = new DefaultResourceResolver();
-
- private final TempAwareResourceResolver delegate;
-
- private DefaultResourceResolver() {
- delegate = new TempAwareResourceResolver(new DefaultTempResourceResolver(),
- new NormalResourceResolver());
- }
-
- public Resource getResource(URI uri) throws IOException {
- return delegate.getResource(uri);
- }
-
- public OutputStream getOutputStream(URI uri) throws IOException {
- return delegate.getOutputStream(uri);
- }
-
- }
-
- private static final class TempAwareResourceResolver implements ResourceResolver {
-
- private final TempResourceResolver tempResourceResolver;
-
- private final ResourceResolver defaultResourceResolver;
-
- public TempAwareResourceResolver(TempResourceResolver tempResourceHandler,
- ResourceResolver defaultResourceResolver) {
- this.tempResourceResolver = tempResourceHandler;
- this.defaultResourceResolver = defaultResourceResolver;
- }
-
- private static boolean isTempUri(URI uri) {
- return TempResourceURIGenerator.isTempUri(uri);
- }
-
- public Resource getResource(URI uri) throws IOException {
- if (isTempUri(uri)) {
- return tempResourceResolver.getResource(uri.getPath());
- } else {
- return defaultResourceResolver.getResource(uri);
- }
- }
-
- public OutputStream getOutputStream(URI uri) throws IOException {
- if (isTempUri(uri)) {
- return tempResourceResolver.getOutputStream(uri.getPath());
- } else {
- return defaultResourceResolver.getOutputStream(uri);
- }
- }
-
- }
-
- private static class DefaultTempResourceResolver implements TempResourceResolver {
- private static File getTempFile(String path) throws IOException {
- File file = new File(System.getProperty("java.io.tmpdir"), path);
- file.deleteOnExit();
- return file;
- }
-
- public Resource getResource(String id) throws IOException {
- return new Resource(getTempFile(id).toURI().toURL().openStream());
- }
-
- public OutputStream getOutputStream(String id) throws IOException {
- File file = getTempFile(id);
- file.createNewFile();
- return new FileOutputStream(file);
- }
- }
-
- private static class NormalResourceResolver implements ResourceResolver {
- public Resource getResource(URI uri) throws IOException {
- return new Resource(uri.toURL().openStream());
- }
-
- public OutputStream getOutputStream(URI uri) throws IOException {
- return new FileOutputStream(new File(uri));
- }
- }
-
- private static final class SchemaAwareResourceResolver implements ResourceResolver {
-
- private final Map<String, ResourceResolver> schemaHandlingResourceResolvers;
-
- private final ResourceResolver defaultResolver;
-
- private SchemaAwareResourceResolver(
- Map<String, ResourceResolver> schemaHandlingResourceResolvers,
- ResourceResolver defaultResolver) {
- this.schemaHandlingResourceResolvers = schemaHandlingResourceResolvers;
- this.defaultResolver = defaultResolver;
- }
-
- private ResourceResolver getResourceResolverForSchema(URI uri) {
- String schema = uri.getScheme();
- if (schemaHandlingResourceResolvers.containsKey(schema)) {
- return schemaHandlingResourceResolvers.get(schema);
- } else {
- return defaultResolver;
- }
- }
-
- public Resource getResource(URI uri) throws IOException {
- return getResourceResolverForSchema(uri).getResource(uri);
- }
-
- public OutputStream getOutputStream(URI uri) throws IOException {
- return getResourceResolverForSchema(uri).getOutputStream(uri);
- }
- }
-
- public interface SchemaAwareResourceResolverBuilder {
-
- void registerResourceResolverForSchema(String schema, ResourceResolver resourceResolver);
-
- ResourceResolver build();
- }
-
- private static final class CompletedSchemaAwareResourceResolverBuilder
- implements SchemaAwareResourceResolverBuilder {
-
- private static final SchemaAwareResourceResolverBuilder INSTANCE
- = new CompletedSchemaAwareResourceResolverBuilder();
-
- public ResourceResolver build() {
- throw new IllegalStateException("Resource resolver already built");
- }
-
- public void registerResourceResolverForSchema(String schema,
- ResourceResolver resourceResolver) {
- throw new IllegalStateException("Resource resolver already built");
- }
- }
-
- private static final class ActiveSchemaAwareResourceResolverBuilder
- implements SchemaAwareResourceResolverBuilder {
-
- private final Map<String, ResourceResolver> schemaHandlingResourceResolvers
- = new HashMap<String, ResourceResolver>();
-
- private final ResourceResolver defaultResolver;
-
- private ActiveSchemaAwareResourceResolverBuilder(ResourceResolver defaultResolver) {
- this.defaultResolver = defaultResolver;
- }
-
- public void registerResourceResolverForSchema(String schema,
- ResourceResolver resourceResolver) {
- schemaHandlingResourceResolvers.put(schema, resourceResolver);
- }
-
- public ResourceResolver build() {
- return new SchemaAwareResourceResolver(
- Collections.unmodifiableMap(schemaHandlingResourceResolvers), defaultResolver);
- }
-
- }
-
- private static final class SchemaAwareResourceResolverBuilderImpl
- implements SchemaAwareResourceResolverBuilder {
-
- private SchemaAwareResourceResolverBuilder delegate;
-
- private SchemaAwareResourceResolverBuilderImpl(ResourceResolver defaultResolver) {
- this.delegate = new ActiveSchemaAwareResourceResolverBuilder(defaultResolver);
- }
-
- public void registerResourceResolverForSchema(String schema,
- ResourceResolver resourceResolver) {
- delegate.registerResourceResolverForSchema(schema, resourceResolver);
- }
-
- public ResourceResolver build() {
- ResourceResolver resourceResolver = delegate.build();
- delegate = CompletedSchemaAwareResourceResolverBuilder.INSTANCE;
- return resourceResolver;
- }
- }
-
- }
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