Initial Implementation

src/main/java/de/kosit/validationtool/impl/ClassPathResourceResolver.java

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+/*
+ * Licensed to the Koordinierungsstelle für IT-Standards (KoSIT) under
+ * one or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  KoSIT 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 de.kosit.validationtool.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.net.URI;
+import java.net.URL;
+
+import org.apache.commons.lang3.StringUtils;
+import org.w3c.dom.ls.LSInput;
+import org.w3c.dom.ls.LSResourceResolver;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * {@link LSResourceResolver} der objekte relativ zu einem Basis-Pfad aus dem Classpath der Anwendung laden kann.
+ * 
+ * @author Andreas Penski
+ */
+@Slf4j
+class ClassPathResourceResolver implements LSResourceResolver {
+
+    private final URI base;
+
+    /**
+     * Instantiiert einen neuen resolver mit angegebenen Basispfad
+     * 
+     * @param basePath der Basispfad
+     */
+    public ClassPathResourceResolver(String basePath) {
+        if (!StringUtils.startsWith(basePath, "/")) {
+            throw new IllegalArgumentException("Base path must start with a slash");
+        }
+        base = URI.create(basePath + (basePath.endsWith("/") == basePath.length() > 1 ? "" : "/"));
+    }
+
+    @Override
+    public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {
+        final URL resource = ClassPathResourceResolver.class.getResource(base.resolve(systemId).toASCIIString());
+        if (resource != null) {
+            try {
+                InputStream in = resource.openStream();
+                final LSInputImpl input = new LSInputImpl(publicId, systemId, baseURI);
+                input.setByteStream(in);
+                return input;
+
+            } catch (IOException e) {
+                log.error("Error loading schema resource from {}", resource, e);
+            }
+        }
+        // not found
+        return null;
+    }
+
+    /**
+     * Simple {@link LSInput}-Implementierung, die einen Stream liefern kann
+     */
+    @Getter
+    @Setter
+    @RequiredArgsConstructor
+    private static class LSInputImpl implements LSInput {
+
+        private Reader characterStream;
+
+        private InputStream byteStream;
+
+        private String systemId;
+
+        private String publicId;
+
+        private String baseURI;
+
+        private String encoding;
+
+        private boolean certifiedText;
+
+        private String stringData;
+
+        /**
+         * Instantiierung einer neue Instanz.
+         * @param publicId die publicId
+         * @param systemId die systemId
+         * @param baseURI die baseURI
+         */
+        public LSInputImpl(String publicId, String systemId, String baseURI) {
+            this.publicId = publicId;
+            this.systemId = systemId;
+            this.baseURI = baseURI;
+        }
+
+        @Override
+        public boolean getCertifiedText() {
+            return certifiedText;
+        }
+    }
+}