com.google.inject.internal.SingleParameterInjector Maven / Gradle / Ivy
/*
* Copyright (C) 2008 Google Inc.
*
* 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 com.google.inject.internal;
import com.google.inject.spi.Dependency;
/** Resolves a single parameter, to be used in a constructor or method invocation. */
final class SingleParameterInjector {
private static final Object[] NO_ARGUMENTS = {};
private final Dependency dependency;
private final Object source;
private final InternalFactory factory;
SingleParameterInjector(Dependency dependency, BindingImpl binding) {
this.dependency = dependency;
this.source = binding.getSource();
this.factory = binding.getInternalFactory();
}
T inject(InternalContext context) throws InternalProvisionException {
Dependency localDependency = dependency;
Dependency previous = context.pushDependency(localDependency, source);
try {
return factory.get(context, localDependency, false);
} catch (InternalProvisionException ipe) {
throw ipe.addSource(localDependency);
} finally {
context.popStateAndSetDependency(previous);
}
}
// TODO(lukes): inline into callers to decrease stack depth
/** Returns an array of parameter values. */
static Object[] getAll(InternalContext context, SingleParameterInjector[] parameterInjectors)
throws InternalProvisionException {
if (parameterInjectors == null) {
return NO_ARGUMENTS;
}
int size = parameterInjectors.length;
Object[] parameters = new Object[size];
// optimization: use manual for/each to save allocating an iterator here
for (int i = 0; i < size; i++) {
parameters[i] = parameterInjectors[i].inject(context);
}
return parameters;
}
}