Example usage for com.google.common.collect Maps newIdentityHashMap

Introduction

In this page you can find the example usage for com.google.common.collect Maps newIdentityHashMap.

Prototype

public static <K, V> IdentityHashMap<K, V> newIdentityHashMap()

Source Link

Document

Creates an IdentityHashMap instance.

Usage

From source file:com.google.javascript.jscomp.TypeInference.java

/**
 * For functions with function(this: T, ...) and T as parameters, type
 * inference will set the type of this on a function literal argument to the
 * the actual type of T./*w  w  w. j a  v a 2  s .c  o  m*/
 */
private boolean inferTemplatedTypesForCall(Node n, FunctionType fnType) {
    final ImmutableList<TemplateType> keys = fnType.getTemplateTypeMap().getTemplateKeys();
    if (keys.isEmpty()) {
        return false;
    }

    // Try to infer the template types
    Map<TemplateType, JSType> rawInferrence = inferTemplateTypesFromParameters(fnType, n);
    Map<TemplateType, JSType> inferred = Maps.newIdentityHashMap();
    for (TemplateType key : keys) {
        JSType type = rawInferrence.get(key);
        if (type == null) {
            type = unknownType;
        }
        inferred.put(key, type);
    }

    // Try to infer the template types using the type transformations
    Map<TemplateType, JSType> typeTransformations = evaluateTypeTransformations(keys, inferred);
    if (typeTransformations != null) {
        inferred.putAll(typeTransformations);
    }

    // Replace all template types. If we couldn't find a replacement, we
    // replace it with UNKNOWN.
    TemplateTypeReplacer replacer = new TemplateTypeReplacer(registry, inferred);
    Node callTarget = n.getFirstChild();

    FunctionType replacementFnType = fnType.visit(replacer).toMaybeFunctionType();
    Preconditions.checkNotNull(replacementFnType);

    callTarget.setJSType(replacementFnType);
    n.setJSType(replacementFnType.getReturnType());

    return replacer.madeChanges;
}