// Copyright 2006 The Apache Software Foundation | |
// | |
// Licensed 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.tapestry5.internal.structure; | |
import org.apache.tapestry5.Binding; | |
import org.apache.tapestry5.MarkupWriter; | |
import org.apache.tapestry5.ioc.services.TypeCoercer; | |
import org.apache.tapestry5.runtime.RenderQueue; | |
/** | |
* | |
*/ | |
public class ExpansionPageElement implements PageElement | |
{ | |
private final Binding binding; | |
private final boolean invariant; | |
private final TypeCoercer coercer; | |
private boolean cached; | |
private String cachedValue; | |
public ExpansionPageElement(Binding binding, TypeCoercer coercer) | |
{ | |
this.binding = binding; | |
this.coercer = coercer; | |
invariant = this.binding.isInvariant(); | |
} | |
public void render(MarkupWriter writer, RenderQueue queue) | |
{ | |
String value = cached ? cachedValue : coercer.coerce(binding.get(), String.class); | |
if (invariant && !cached) | |
{ | |
cachedValue = value; | |
cached = true; | |
} | |
writer.write(value); | |
} | |
@Override | |
public String toString() | |
{ | |
return String.format("Expansion[%s]", binding.toString()); | |
} | |
} |