Github user aledsage commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,166 @@
    + * 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
    + *
    + *
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + */
    +package org.apache.brooklyn.core.config;
    +import java.util.Map;
    +import org.apache.brooklyn.config.ConfigInheritance;
    +import org.apache.brooklyn.config.ConfigInheritances;
    +import org.apache.brooklyn.config.ConfigKey;
    +import org.apache.brooklyn.config.ConfigValueAtContainer;
    +import org.apache.brooklyn.util.collections.CollectionMerger;
    +import org.apache.brooklyn.util.exceptions.ReferenceWithError;
    +import org.apache.brooklyn.util.guava.Maybe;
    +public class BasicConfigInheritance implements ConfigInheritance {
    +    private static final long serialVersionUID = -5916548049057961051L;
    +    public static final String CONFLICT_RESOLUTION_STRATEGY_DEEP_MERGE = 
    +    public static final String CONFLICT_RESOLUTION_STRATEGY_OVERWRITE = 
    +    /** Indicates that a config key value should not be passed down from a 
container where it is defined.
    +     * Unlike {@link #NEVER_INHERITED} these values can be passed down if 
set as anonymous keys at a container
    +     * (ie the container does not expect it) to a container which does 
expect it, but it will not be passed down further. 
    +     * If the inheritor also defines a value the parent's value is ignored 
    +     * (as in {@link #OVERWRITE}; see {@link 
#NOT_REINHERITED_ELSE_DEEP_MERGE} if merging is desired). */
    +    public static BasicConfigInheritance NOT_REINHERITED = new 
    +    /** As {@link #NOT_REINHERITED} but in cases where a value is 
inherited because a parent did not recognize it,
    +     * if the inheritor also defines a value the two values should be 
merged. */
    +    public static BasicConfigInheritance NOT_REINHERITED_ELSE_DEEP_MERGE = 
new BasicConfigInheritance(false,CONFLICT_RESOLUTION_STRATEGY_DEEP_MERGE,false);
    +    /** Indicates that a key's value should never be inherited, even if 
defined on a container that does not know the key.
    +     * Most usages will prefer {@link #NOT_REINHERITED}. */
    +    public static BasicConfigInheritance NEVER_INHERITED = new 
    +    /** Indicates that if a key has a value at both an ancestor and a 
descendant, the descendant and his descendants
    +     * will prefer the value at the descendant. */
    +    public static BasicConfigInheritance OVERWRITE = new 
    +    /** Indicates that if a key has a value at both an ancestor and a 
descendant, the descendant and his descendants
    +     * should attempt to merge the values. If the values are not mergable 
behaviour is undefined
    +     * (and often the descendant's value will simply overwrite). */
    +    public static BasicConfigInheritance DEEP_MERGE = new 
    +    // reinheritable? true/false; if false, 
children/descendants/inheritors will never see it; default true
    +    protected final boolean isReinherited;
    +    // conflict-resolution-strategy? overwrite or deep_merge or null; 
default null meaning caller supplies
    +    // (overriding resolveConflict)
    +    protected final String conflictResolutionStrategy;
    +    // use-local-default-value? true/false; if true, overwrite above means 
"always ignore (even if null)"; default false
    +    // whereas merge means "use local default (if non-null)"
    +    protected final boolean useLocalDefaultValue;
    +    protected BasicConfigInheritance(boolean isReinherited, String 
conflictResolutionStrategy, boolean useLocalDefaultValue) {
    +        super();
    +        this.isReinherited = isReinherited;
    +        this.conflictResolutionStrategy = conflictResolutionStrategy;
    +        this.useLocalDefaultValue = useLocalDefaultValue;
    +    }
    +    @SuppressWarnings("deprecation")
    +    @Override
    +    public InheritanceMode isInherited(ConfigKey<?> key, Object from, 
Object to) {
    +        return null;
    +    }
    +    @Override
    +    public <TContainer, TValue> boolean 
isReinheritable(ConfigValueAtContainer<TContainer, TValue> parent, 
ConfigInheritanceContext context) {
    +        if (!equals(ConfigInheritances.findInheritance(parent, context, 
    +            throw new IllegalStateException("Method can only be invoked on 
inheritance at "+parent);
    --- End diff --
    Can we give more info in the message about the entity/context that it was 
called on, versus what was expected?

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