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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.xmlgraphics.io;
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import java.util.concurrent.atomic.AtomicLong;
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* Creates a URI for any temporary resource used within XGC.
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public final class TempResourceURIGenerator {
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public static final String TMP_SCHEME = "tmp";
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private final String tempURIPrefix;
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private final AtomicLong counter;
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* @param uriPrefix a prefix used to name the unique URI
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public TempResourceURIGenerator(String uriPrefix) {
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counter = new AtomicLong();
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tempURIPrefix = URI.create(TMP_SCHEME + ":///" + uriPrefix).toASCIIString();
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* Generate a unique URI for a temporary resource
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public URI generate() {
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return URI.create(tempURIPrefix + getUniqueId());
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private String getUniqueId() {
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return Long.toHexString(counter.getAndIncrement());
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public static boolean isTempURI(URI uri) {
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return TMP_SCHEME.equals(uri.getScheme());