Example usage for com.google.common.collect Multiset hashCode

Introduction

In this page you can find the example usage for com.google.common.collect Multiset hashCode.

Prototype

@Override
int hashCode();

Source Link

Document

Returns the hash code for this multiset.

Usage

From source file:com.google.devtools.kythe.analyzers.java.JavaEntrySets.java

private int hashSymbol(Symbol sym) {
    // This method is necessary because Symbol, and most other javac internals, do not overload the
    // Object#hashCode() method and the default implementation, System#identityHashCode(Object), is
    // practically useless because it can change across JVM instances.  This method instead only
    // uses stable hashing methods such as String#hashCode(), Multiset#hashCode(), and
    // Integer#hashCode().

    if (symbolHashes.containsKey(sym)) {
        return symbolHashes.get(sym);
    }//w w  w . ja v  a  2 s. c o  m

    Multiset<Integer> hashes = HashMultiset.create();
    if (sym.members() != null) {
        for (Symbol member : sym.members().getSymbols()) {
            if (member.isPrivate()
                    || member instanceof MethodSymbol && ((MethodSymbol) member).isStaticOrInstanceInit()
                    || ((member.flags_field & (Flags.BRIDGE | Flags.SYNTHETIC)) != 0)) {
                // Ignore initializers, private members, and synthetic members.  It's possible these do
                // not appear in the symbol's scope outside of its .java source compilation (i.e. they do
                // not appear in dependent compilations for Bazel's java rules).
                continue;
            }
            // We can't recursively get the result of hashSymbol(member) since the extractor removes all
            // .class files not directly used by a compilation meaning that member may not be complete.
            hashes.add(member.getSimpleName().toString().hashCode());
            hashes.add(member.kind.ordinal());
        }
    }

    hashes.add(sym.getQualifiedName().toString().hashCode());
    hashes.add(sym.getKind().ordinal());
    for (Modifier mod : sym.getModifiers()) {
        hashes.add(mod.ordinal());
    }

    int h = hashes.hashCode();
    symbolHashes.put(sym, h);
    return h;
}

---