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java/org/apache/catalina/webresources/AbstractResource.java

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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.
+ */
+package org.apache.catalina.webresources;
+
+import java.io.InputStream;
+
+import org.apache.catalina.WebResource;
+import org.apache.catalina.WebResourceRoot;
+import org.apache.juli.logging.Log;
+import org.apache.tomcat.util.http.FastHttpDateFormat;
+import org.apache.tomcat.util.res.StringManager;
+
+public abstract class AbstractResource implements WebResource {
+
+    protected static final StringManager sm = StringManager.getManager(AbstractResource.class);
+
+    private final WebResourceRoot root;
+    private final String webAppPath;
+
+    private String mimeType = null;
+    private volatile String weakETag;
+
+
+    protected AbstractResource(WebResourceRoot root, String webAppPath) {
+        this.root = root;
+        this.webAppPath = webAppPath;
+    }
+
+
+    @Override
+    public final WebResourceRoot getWebResourceRoot() {
+        return root;
+    }
+
+
+    @Override
+    public final String getWebappPath() {
+        return webAppPath;
+    }
+
+
+    @Override
+    public final String getLastModifiedHttp() {
+        return FastHttpDateFormat.formatDate(getLastModified());
+    }
+
+
+    @Override
+    public final String getETag() {
+        if (weakETag == null) {
+            synchronized (this) {
+                if (weakETag == null) {
+                    long contentLength = getContentLength();
+                    long lastModified = getLastModified();
+                    if ((contentLength >= 0) || (lastModified >= 0)) {
+                        weakETag = "W/\"" + contentLength + "-" +
+                                   lastModified + "\"";
+                    }
+                }
+            }
+        }
+        return weakETag;
+    }
+
+    @Override
+    public final void setMimeType(String mimeType) {
+        this.mimeType = mimeType;
+    }
+
+
+    @Override
+    public final String getMimeType() {
+        return mimeType;
+    }
+
+
+    @Override
+    public final InputStream getInputStream() {
+        InputStream is = doGetInputStream();
+
+        if (is == null || !root.getTrackLockedFiles()) {
+            return is;
+        }
+
+        return new TrackedInputStream(root, getName(), is);
+    }
+
+    protected abstract InputStream doGetInputStream();
+
+
+    protected abstract Log getLog();
+}