01: // Copyright 2006 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // Unless required by applicable law or agreed to in writing, software
10: // distributed under the License is distributed on an "AS IS" BASIS,
11: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: // See the License for the specific language governing permissions and
13: // limitations under the License.
14:
15: package org.apache.tapestry.runtime;
16:
17: import org.apache.tapestry.MarkupWriter;
18:
19: /**
20: * A command used during rendering of a page.
21: */
22: public interface RenderCommand {
23: /**
24: * Invoked on an object to request that it render itself. This involves a mix of invoking
25: * methods on the writer, and queueing up additional commands (often, representing children of
26: * the object that was invoked) to perform additional rendering.
27: * <p>
28: * In this way, rendering is a tail recursive algorithm, but is not implemented using tail
29: * recursion.
30: */
31: void render(MarkupWriter writer, RenderQueue queue);
32: }
|