TUSCANY-2537: Apply patch from Dan Becker for Demonstrate Atom Binding end to end caching (ETag, Last-modified use) in

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@687288 13f79535-47bb-0310-9956-ffa450edef68

java/sca/modules/binding-atom/src/main/java/org/apache/tuscany/sca/binding/atom/CacheContext.java

@@ -0,0 +1,117 @@
+/*
+ * 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.tuscany.sca.binding.atom;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * A class to store cache settings for Atom and HTTP requests and responses.
+ */
+public class CacheContext {
+    private static final SimpleDateFormat RFC822DateFormat = new SimpleDateFormat( "EEE, dd MMM yyyy HH:mm:ss Z" ); // RFC 822 date time
+	public String eTag;
+	public String lastModified;
+	public Date lastModifiedDate;
+	public String [] predicates;
+
+	/**
+	 * An ETag is a unique ID for an item. It changes when
+	 * a field in the item or the update date changes.
+	 * See HTTP specification for how ETags work:
+	 * http://tools.ietf.org/html/rfc2616
+	 * @return the eTag
+	 */
+	public String getETag() {
+		return eTag;
+	}
+	/**
+	 * @param tag the eTag to set
+	 */
+	public void setETag(String tag) {
+		eTag = tag;
+	}
+	/**
+	 * The LastModified date is the time the item was last 
+	 * changed. See HTTP specification for how ETags work:
+	 * http://tools.ietf.org/html/rfc2616
+	 * @return the lastModified
+	 */
+	public String getLastModified() {
+		return lastModified;
+	}
+	/**
+	 * The LastModified date is the time the item was last 
+	 * changed. See HTTP specification for how ETags work:
+	 * http://tools.ietf.org/html/rfc2616
+	 * @return the lastModified
+	 */
+	public Date getLastModifiedAsDate() {
+		return lastModifiedDate;
+	}
+	/**
+	 * @param lastModified the lastModified to set
+	 */
+	public void setLastModified(String lastModified) throws java.text.ParseException {
+		this.lastModified = lastModified;
+		// Catch date formatting on input to help debugging.
+  		lastModifiedDate = RFC822DateFormat.parse( lastModified );
+	}
+	
+	/**
+	 * Predicates are statements that work in conjunction with
+	 * ETags and LastModified dates to determine if a precondition
+	 * or postcondition is satisfied.
+	 * See HTTP specification for how predicates wrk:
+	 * http://tools.ietf.org/html/rfc2616
+	 * Example predicats in HTTP include If-Match, If-None-Match,
+	 * If-Modified-Since, If-Unmodified-Since, If-Range.
+	 * @return the predicates
+	 */
+	public String[] getPredicates() {
+		return predicates;
+	}
+	/**
+	 * @param predicates the predicates to set
+	 */
+	public void setPredicates(String[] predicates) {
+		this.predicates = predicates;
+	}	
+	
+    public String toString() {
+		StringBuffer sb = new StringBuffer(", predicates=");
+		if (predicates == null) {
+			sb.append("null");
+        } else if ( predicates.length == 0 ){
+			sb.append("length=0");
+		} else { 
+			for (int i = 0; i < predicates.length; i++) {
+				if (i > 0)
+					sb.append(", ");
+				sb.append(predicates[i]);
+			}
+		}
+
+		return "eTag=" + eTag + ", lastModified=" + lastModified
+				+ sb.toString();
+	}
+}