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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.afp.util;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.fop.apps.io.InternalResourceResolver;
/**
* Defines an interface through which external resource objects can be accessed.
*/
public final class AFPResourceAccessor {
private final InternalResourceResolver resourceResolver;
private final String baseURI;
/**
* 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;
this.baseURI = baseURI;
}
/**
* 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);
}
private URI getResourceURI(URI uri) {
if (baseURI == null) {
return uri;
}
try {
URI baseURI = InternalResourceResolver.getBaseURI(this.baseURI);
return baseURI.resolve(uri);
} catch (URISyntaxException use) {
return uri;
}
}
/**
* 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(getResourceURI(uri));
}
}
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