dexlib2/src/main/java/org/jf/dexlib2/analysis/UnknownClassProto.java

/*
 * Copyright 2013, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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package org.jf.dexlib2.analysis;

import org.jf.dexlib2.iface.Method;
import org.jf.dexlib2.iface.reference.FieldReference;
import org.jf.dexlib2.iface.reference.MethodReference;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class UnknownClassProto implements TypeProto {
    @Nonnull protected final ClassPath classPath;

    public UnknownClassProto(@Nonnull ClassPath classPath) {
        this.classPath = classPath;
    }

    @Override public String toString() { return "Ujava/lang/Object;"; }
    @Nonnull @Override public ClassPath getClassPath() { return classPath; }
    @Nullable @Override public String getSuperclass() { return null; }
    @Override public boolean isInterface() { return false; }
    @Override public boolean implementsInterface(@Nonnull String iface) { return false; }

    @Nonnull @Override public TypeProto getCommonSuperclass(@Nonnull TypeProto other) {
        if (other.getType().equals("Ljava/lang/Object;")) {
            return other;
        }
        if (other instanceof ArrayProto) {
            // if it's an array class, it's safe to assume this unknown class isn't related, and so
            // java.lang.Object is the only possible superclass
            return classPath.getClass("Ljava/lang/Object;");
        }
        return this;
    }

    @Nonnull @Override public String getType() {
        // use the otherwise used U prefix for an unknown/unresolvable class
        return "Ujava/lang/Object;";
    }

    @Override
    @Nullable
    public FieldReference getFieldByOffset(int fieldOffset) {
        return classPath.getClass("Ljava/lang/Object;").getFieldByOffset(fieldOffset);
    }

    @Override
    @Nullable
    public Method getMethodByVtableIndex(int vtableIndex) {
        return classPath.getClass("Ljava/lang/Object;").getMethodByVtableIndex(vtableIndex);
    }

    @Override public int findMethodIndexInVtable(@Nonnull MethodReference method) {
        return classPath.getClass("Ljava/lang/Object;").findMethodIndexInVtable(method);
    }
}