WW-5080 Defines a new result type plain to use directly with Java code

core/src/main/java/org/apache/struts2/result/PlainResult.java

@@ -0,0 +1,64 @@
+/*
+ * 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.struts2.result;
+
+import com.opensymphony.xwork2.ActionInvocation;
+import com.opensymphony.xwork2.Result;
+import org.apache.struts2.StrutsException;
+import org.apache.struts2.result.plain.HttpHeader;
+import org.apache.struts2.result.plain.ResponseBuilder;
+
+import javax.servlet.http.Cookie;
+import javax.servlet.http.HttpServletResponse;
+
+public interface PlainResult extends Result {
+
+    @Override
+    default void execute(ActionInvocation invocation) throws Exception {
+        ResponseBuilder builder = new ResponseBuilder();
+        write(builder);
+
+        HttpServletResponse response = invocation.getInvocationContext().getServletResponse();
+
+        if (response.isCommitted()) {
+            throw new StrutsException("Http response already committed, cannot modify it!");
+        }
+
+        for (HttpHeader<String> header : builder.getStringHeaders()) {
+            response.addHeader(header.getName(), header.getValue());
+        }
+        for (HttpHeader<Long> header : builder.getDateHeaders()) {
+            response.addDateHeader(header.getName(), header.getValue());
+        }
+        for (HttpHeader<Integer> header : builder.getIntHeaders()) {
+            response.addIntHeader(header.getName(), header.getValue());
+        }
+
+        for (Cookie cookie : builder.getCookies()) {
+            response.addCookie(cookie);
+        }
+
+        response.getWriter().write(builder.getBody());
+        response.flushBuffer();
+    }
+
+    void write(ResponseBuilder response);
+
+}
+

core/src/main/java/org/apache/struts2/result/plain/BodyWriter.java

@@ -0,0 +1,41 @@
+/*
+ * 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.struts2.result.plain;
+
+import java.io.StringWriter;
+
+class BodyWriter {
+
+    private final StringWriter body = new StringWriter();
+
+    public BodyWriter write(String out) {
+        body.write(out);
+        return this;
+    }
+
+    public BodyWriter writeLine(String out) {
+        body.write(out);
+        body.write("\n");
+        return this;
+    }
+
+    public String getBody() {
+        return body.toString();
+    }
+}

core/src/main/java/org/apache/struts2/result/plain/DateHttpHeader.java

@@ -0,0 +1,38 @@
+/*
+ * 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.struts2.result.plain;
+
+class DateHttpHeader implements HttpHeader<Long> {
+
+    private final String name;
+    private final Long value;
+
+    public DateHttpHeader(String name, Long value) {
+        this.name = name;
+        this.value = value;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Long getValue() {
+        return value;
+    }
+}

core/src/main/java/org/apache/struts2/result/plain/HttpCookies.java

@@ -0,0 +1,39 @@
+/*
+ * 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.struts2.result.plain;
+
+import javax.servlet.http.Cookie;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+class HttpCookies {
+
+    private final List<Cookie> cookies = new ArrayList<>();
+
+    public HttpCookies add(String name, String value) {
+        cookies.add(new Cookie(name, value));
+        return this;
+    }
+
+    public List<Cookie> getCookies() {
+        return Collections.unmodifiableList(cookies);
+    }
+
+}

core/src/main/java/org/apache/struts2/result/plain/HttpHeader.java

@@ -0,0 +1,27 @@
+/*
+ * 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.struts2.result.plain;
+
+public interface HttpHeader<T> {
+
+    String getName();
+
+    T getValue();
+
+}

core/src/main/java/org/apache/struts2/result/plain/HttpHeaders.java

@@ -0,0 +1,58 @@
+/*
+ * 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.struts2.result.plain;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+class HttpHeaders {
+
+    private final List<HttpHeader<String>> stringHeaders = new ArrayList<>();
+    private final List<HttpHeader<Long>> dateHeaders = new ArrayList<>();
+    private final List<HttpHeader<Integer>> intHeaders = new ArrayList<>();
+
+    public HttpHeaders add(String name, String value) {
+        stringHeaders.add(new StringHttpHeader(name, value));
+        return this;
+    }
+
+    public HttpHeaders add(String name, Long value) {
+        dateHeaders.add(new DateHttpHeader(name, value));
+        return this;
+    }
+
+    public HttpHeaders add(String name, Integer value) {
+        intHeaders.add(new IntHttpHeader(name, value));
+        return this;
+    }
+
+    public List<HttpHeader<String>> getStringHeaders() {
+        return Collections.unmodifiableList(stringHeaders);
+    }
+
+    public List<HttpHeader<Long>> getDateHeaders() {
+        return Collections.unmodifiableList(dateHeaders);
+    }
+
+    public List<HttpHeader<Integer>> getIntHeaders() {
+        return Collections.unmodifiableList(intHeaders);
+    }
+
+}

core/src/main/java/org/apache/struts2/result/plain/IntHttpHeader.java

@@ -0,0 +1,39 @@
+/*
+ * 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.struts2.result.plain;
+
+class IntHttpHeader implements HttpHeader<Integer> {
+
+    private final String name;
+    private final Integer value;
+
+    public IntHttpHeader(String name, Integer value) {
+        this.name = name;
+        this.value = value;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Integer getValue() {
+        return value;
+    }
+
+}