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Java example source code file (ConstantBindingBuilderImpl.java)

This example Java source code file (ConstantBindingBuilderImpl.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractbindingbuilder, annotatedconstantbindingbuilder, annotation, bindingimpl, class, constantbindingbuilder, constantbindingbuilderimpl, instancebindingimpl, key, list, null_key, object, string, suppresswarnings, util

The ConstantBindingBuilderImpl.java Java example source code

/**
 * 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.common.collect.ImmutableSet;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.binder.AnnotatedConstantBindingBuilder;
import com.google.inject.binder.ConstantBindingBuilder;
import com.google.inject.spi.Element;
import com.google.inject.spi.InjectionPoint;

import java.lang.annotation.Annotation;
import java.util.List;

/**
 * Bind a constant.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 */
public final class ConstantBindingBuilderImpl<T>
    extends AbstractBindingBuilder<T>
    implements AnnotatedConstantBindingBuilder, ConstantBindingBuilder {

  @SuppressWarnings("unchecked") // constant bindings start out with T unknown
  public ConstantBindingBuilderImpl(Binder binder, List<Element> elements, Object source) {
    super(binder, elements, source, (Key<T>) NULL_KEY);
  }

  public ConstantBindingBuilder annotatedWith(Class<? extends Annotation> annotationType) {
    annotatedWithInternal(annotationType);
    return this;
  }

  public ConstantBindingBuilder annotatedWith(Annotation annotation) {
    annotatedWithInternal(annotation);
    return this;
  }

  public void to(final String value) {
    toConstant(String.class, value);
  }

  public void to(final int value) {
    toConstant(Integer.class, value);
  }

  public void to(final long value) {
    toConstant(Long.class, value);
  }

  public void to(final boolean value) {
    toConstant(Boolean.class, value);
  }

  public void to(final double value) {
    toConstant(Double.class, value);
  }

  public void to(final float value) {
    toConstant(Float.class, value);
  }

  public void to(final short value) {
    toConstant(Short.class, value);
  }

  public void to(final char value) {
    toConstant(Character.class, value);
  }

  public void to(final byte value) {
    toConstant(Byte.class, value);
  }  

  public void to(final Class<?> value) {
    toConstant(Class.class, value);
  }

  public <E extends Enum void to(final E value) {
    toConstant(value.getDeclaringClass(), value);
  }

  private void toConstant(Class<?> type, Object instance) {
    // this type will define T, so these assignments are safe
    @SuppressWarnings("unchecked")
    Class<T> typeAsClassT = (Class) type;
    @SuppressWarnings("unchecked")
    T instanceAsT = (T) instance;

    if (keyTypeIsSet()) {
      binder.addError(CONSTANT_VALUE_ALREADY_SET);
      return;
    }

    BindingImpl<T> base = getBinding();
    Key<T> key;
    if (base.getKey().getAnnotation() != null) {
      key = Key.get(typeAsClassT, base.getKey().getAnnotation());
    } else if (base.getKey().getAnnotationType() != null) {
      key = Key.get(typeAsClassT, base.getKey().getAnnotationType());
    } else {
      key = Key.get(typeAsClassT);
    }

    if (instanceAsT == null) {
      binder.addError(BINDING_TO_NULL);
    }

    setBinding(new InstanceBindingImpl<T>(
        base.getSource(), key, base.getScoping(), ImmutableSet.<InjectionPoint>of(), instanceAsT));
  }

  @Override public String toString() {
    return "ConstantBindingBuilder";
  }
}

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