/
TearOffSupport.java
84 lines (77 loc) · 3.3 KB
/
TearOffSupport.java
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/*
* Copyright (c) 2004-2010, Kohsuke Kawaguchi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.kohsuke.stapler;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.lang.reflect.InvocationTargetException;
/**
* Allows "tear-off" objects to be linked to the parent object.
*
* <p>
* This mechanism is used to avoid static linking optional packages,
* so that stapler can work even when the optional dependencies are missing.
*
* @author Kohsuke Kawaguchi
*/
public abstract class TearOffSupport {
private final ClassValue<Object> tearOffs = new ClassValue<Object>() {
@SuppressFBWarnings(value = "THROWS_METHOD_THROWS_RUNTIMEEXCEPTION", justification = "shut up")
@Override
protected Object computeValue(Class<?> type) {
try {
return type.getConstructor(TearOffSupport.this.getClass()).newInstance(TearOffSupport.this);
} catch (InstantiationException e) {
throw new InstantiationError(e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalAccessError(e.getMessage());
} catch (InvocationTargetException e) {
Throwable ex = e.getTargetException();
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
if (ex instanceof Error) {
throw (Error) ex;
}
throw new Error(e);
} catch (NoSuchMethodException e) {
throw new NoSuchMethodError(e.getMessage());
}
}
};
/**
* @deprecated Unused? Use {@link #loadTearOff}.
*/
@Deprecated
public final <T> T getTearOff(Class<T> t) {
return loadTearOff(t);
}
public final <T> T loadTearOff(Class<T> t) {
return t.cast(tearOffs.get(t));
}
/**
* @deprecated Unused?
*/
@Deprecated
public <T> void setTearOff(Class<T> type, T instance) {
throw new UnsupportedOperationException();
}
}