/*
* 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.isis.core.metamodel.facets.object.title.annotation;
import java.lang.reflect.Method;
import java.util.List;
import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.base.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.isis.applib.annotation.Title;
import org.apache.isis.applib.profiles.Localization;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.adapter.mgr.AdapterManager;
import org.apache.isis.core.metamodel.facetapi.FacetHolder;
import org.apache.isis.core.metamodel.facets.object.title.TitleFacetAbstract;
public class TitleFacetViaTitleAnnotation extends TitleFacetAbstract {
private static final Logger LOG = LoggerFactory.getLogger(TitleFacetViaTitleAnnotation.class);
private final List<TitleComponent> components;
private final AdapterManager adapterManager;
public static class TitleComponent {
public static final Function<? super Method, ? extends TitleComponent> FROM_METHOD = new Function<Method, TitleComponent>() {
@Override
public TitleComponent apply(final Method input) {
return TitleComponent.of(input);
}
};
private final String prepend;
private final String append;
private final Method method;
private final int abbreviateTo;
private TitleComponent(final String prepend, final String append, final Method method, final int abbreviateTo) {
super();
this.prepend = prepend;
this.append = append;
this.method = method;
this.abbreviateTo = abbreviateTo;
}
public String getPrepend() {
return prepend;
}
public String getAppend() {
return append;
}
public Method getMethod() {
return method;
}
public static TitleComponent of(final Method method) {
final Title annotation = method.getAnnotation(Title.class);
final String prepend = annotation != null ? annotation.prepend() : " ";
final String append = annotation != null ? annotation.append() : "";
final int abbreviateTo = annotation != null ? annotation.abbreviatedTo() : Integer.MAX_VALUE;
return new TitleComponent(prepend, append, method, abbreviateTo);
}
}
public TitleFacetViaTitleAnnotation(final List<TitleComponent> components, final FacetHolder holder, final AdapterManager adapterManager) {
super(holder);
this.components = components;
this.adapterManager = adapterManager;
}
@Override
public String title(final ObjectAdapter targetAdapter, final Localization localization) {
return title(null, targetAdapter, localization);
}
private String titleOf(final ObjectAdapter adapter) {
if (adapter == null) {
return null;
}
return adapter.titleString(null);
}
public List<TitleComponent> getComponents() {
return components;
}
private static String abbreviated(final String str, final int maxLength) {
return str.length() < maxLength ? str : str.substring(0, maxLength - 3) + "...";
}
@Override
public String title(ObjectAdapter contextAdapter, ObjectAdapter targetAdapter, Localization localization) {
final StringBuilder stringBuilder = new StringBuilder();
try {
for (final TitleComponent component : this.components) {
final Object titlePart = ObjectAdapter.InvokeUtils.invoke(component.getMethod(), targetAdapter);
if (titlePart == null) {
continue;
}
// ignore context, if provided
final ObjectAdapter titlePartAdapter = adapterManager.adapterFor(titlePart);
if(Objects.equal(contextAdapter, titlePartAdapter)) {
continue;
}
String title = titleOf(titlePartAdapter);
if (Strings.isNullOrEmpty(title)) {
// ... use the toString() otherwise
// (mostly for benefit of testing...)
title = titlePart.toString().trim();
}
if(Strings.isNullOrEmpty(title)) {
continue;
}
stringBuilder.append(component.getPrepend());
stringBuilder.append(abbreviated(title, component.abbreviateTo));
stringBuilder.append(component.getAppend());
}
return stringBuilder.toString().trim();
} catch (final RuntimeException ex) {
LOG.warn("Title failure", ex);
return "Failed Title";
}
}
}