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/**
* Copyright (c) 2009-2012, Netbout.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) 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. 3) Neither the name of the NetBout.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* 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 HOLDER 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 com.netbout.spi.cpa;
import com.jcabi.log.Logger;
import com.netbout.spi.PlainBuilder;
import com.netbout.spi.Token;
import com.netbout.spi.plain.PlainVoid;
import java.lang.reflect.Method;
/**
* Classpath annotations helper.
*
* @author Yegor Bugayenko ([email protected])
* @version $Id: HelpTarget.java 3116 2012-08-02 18:28:36Z guard $
*/
final class HelpTarget {
/**
* The farm.
*/
private final transient Object farm;
/**
* The method to call.
*/
private final transient Method method;
/**
* Private ctor, use {@link #build(Object,Method)} instead.
* @param frm Farm object
* @param mtd Method to call on this farm
*/
private HelpTarget(final Object frm, final Method mtd) {
this.farm = frm;
this.method = mtd;
}
/**
* Build new object.
* @param frm Farm object
* @param mtd Method to call on this farm
* @return The target created
*/
public static HelpTarget build(final Object frm, final Method mtd) {
return new HelpTarget(frm, mtd);
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return this.method.toGenericString();
}
/**
* Execute it with arguments.
* @param token The token
*/
@SuppressWarnings("PMD.AvoidCatchingThrowable")
public void execute(final Token token) {
final Object[] params = HelpTarget.converted(
token,
this.method.getParameterTypes()
);
Object result;
try {
result = this.method.invoke(this.farm, params);
} catch (IllegalAccessException ex) {
throw new IllegalStateException(
String.format(
"Failed to access \"%s\"",
this.method.toGenericString()
),
ex
);
} catch (java.lang.reflect.InvocationTargetException ex) {
throw new IllegalStateException(
Logger.format(
"Failed to call \"%s\" with %[list]s",
this.method.toGenericString(),
HelpTarget.typesOf(params)
),
ex
);
// @checkstyle IllegalCatch (1 line)
} catch (Throwable ex) {
throw new IllegalArgumentException(
Logger.format(
"Exception in \"%s\" with %[list]s",
this.method.toGenericString(),
HelpTarget.typesOf(params)
),
ex
);
}
if (this.method.getReturnType().equals(Void.TYPE)) {
token.result(new PlainVoid());
} else if (result != null) {
token.result(PlainBuilder.fromObject(result));
}
}
/**
* Convert argument types.
* @param token The token
* @param types Expected types for every one of them
* @return Array of properly typed args
*/
private static Object[] converted(final Token token, final Class[] types) {
final Object[] converted = new Object[types.length];
for (int pos = 0; pos < types.length; pos += 1) {
converted[pos] = token.arg(pos).value();
}
return converted;
}
/**
* Extract types of objects into array.
* @param objects Objects
* @return Array of their types
*/
private static Class[] typesOf(final Object[] objects) {
final Class[] types = new Class[objects.length];
for (int pos = 0; pos < objects.length; pos += 1) {
types[pos] = objects[pos].getClass();
}
return types;
}
}
