org.apache.brooklyn.util.guava.AnyExceptionSupplier Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of brooklyn-utils-common Show documentation
Show all versions of brooklyn-utils-common Show documentation
Utility classes and methods developed for Brooklyn but not dependendent on Brooklyn or much else
/*
* 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.brooklyn.util.guava;
import org.apache.brooklyn.util.exceptions.Exceptions.CollapseTextSupplier;
import org.apache.brooklyn.util.javalang.Reflections;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
public class AnyExceptionSupplier implements Supplier {
protected final Class type;
protected final Supplier message;
protected final Throwable cause;
public AnyExceptionSupplier(Class type) { this(type, (Supplier)null, null); }
public AnyExceptionSupplier(Class type, String message) { this(type, message, null); }
public AnyExceptionSupplier(Class type, Throwable cause) { this(type, new CollapseTextSupplier(cause), cause); }
public AnyExceptionSupplier(Class type, String message, Throwable cause) { this(type, Suppliers.ofInstance(message), cause); }
public AnyExceptionSupplier(Class type, Supplier message, Throwable cause) {
this.type = type;
this.message = message;
this.cause = cause;
}
@Override
public T get() {
String msg = message==null ? null : message.get();
Maybe result = Maybe.absent();
if (result.isAbsent() && msg==null && cause==null) result = Reflections.invokeConstructorFromArgs(type);
if (result.isAbsent() && cause==null) result = Reflections.invokeConstructorFromArgs(type, msg);
if (result.isAbsent() && msg==null) result = Reflections.invokeConstructorFromArgs(type, cause);
if (result.isAbsent()) result = Reflections.invokeConstructorFromArgs(type, msg, cause);
if (result.isAbsent()) {
throw new IllegalStateException("Cannot create desired "+type+" (missing constructor)",
new IllegalStateException(message==null ? null : message.get(), cause));
}
return result.get();
}
public Throwable getCause() {
return cause;
}
public Supplier getMessageSupplier() {
return message;
}
}