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/*
 *  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
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package groovy.transform.stc;

import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.control.CompilationUnit;
import org.codehaus.groovy.control.SourceUnit;

/**
 * 

A hint used to instruct the type checker to pick the first parameter type. For example:

* public <T> def doWith(T src, @ClosureParams(FirstParam.class) Closure c) { c.call(src); } * *

This class has several inner classes that also helps picking generic argument types instead of the parameter type.

* * @author Cédric Champeau * @since 2.3.0 */ public class FirstParam extends PickAnyArgumentHint { public FirstParam() { super(0,-1); } /** *

A hint used to instruct the type checker to pick the first generic type of the first parameter type. For example:

* void <T> doWithElements(List<T> src, @ClosureParams(FirstParam.FirstGenericType.class) Closure c) { src.each { c.call(it) } } * * @author Cédric Champeau * @since 2.3.0 */ public static class FirstGenericType extends PickAnyArgumentHint { public FirstGenericType() { super(0,0); } } /** *

A hint used to instruct the type checker to pick the second generic type of the first parameter type. For example:

* void <T,U> doWithElements(Tuple<T,U> src, @ClosureParams(FirstParam.SecondGenericType.class) Closure c) { src.each { c.call(it) } } * * @author Cédric Champeau * @since 2.3.0 */ public static class SecondGenericType extends PickAnyArgumentHint { public SecondGenericType() { super(0,1); } } /** *

A hint used to instruct the type checker to pick the third generic type of the first parameter type. For example:

* void <T,U,V> doWithElements(Triple<T,U,V> src, @ClosureParams(FirstParam.ThirdGenericType.class) Closure c) { src.each { c.call(it) } } * * @author Cédric Champeau * @since 2.3.0 */ public static class ThirdGenericType extends PickAnyArgumentHint { public ThirdGenericType() { super(0,2); } } /** *

A hint used to instruct the type checker to pick the type of the component of the first parameter type, which is therefore * expected to be an array, like in this example:

* void <T> doWithArray(T[] array, @ClosureParams(FirstParam.Component.class) Closure c) { array.each { c.call(it)} } */ public static class Component extends FirstParam { @Override public ClassNode[] getParameterTypes(final MethodNode node, final String[] options, final SourceUnit sourceUnit, final CompilationUnit unit, final ASTNode usage) { final ClassNode[] parameterTypes = super.getParameterTypes(node, options, sourceUnit, unit, usage); parameterTypes[0] = parameterTypes[0].getComponentType(); return parameterTypes; } } }




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