GenericClassMap.java

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package com.arcle.rmt.j2se.util;

import java.util.Map;
import java.util.Iterator;
import com.arcle.rmt.xplat.util.MutableReference;

public abstract class GenericClassMap {

    public boolean visitClasses(ClassMapVisitor v) {
        boolean wantsMore = true;
        Iterator iter = getMappings().entrySet().iterator();
        while (iter.hasNext() && wantsMore) {
            Map.Entry entry = (Map.Entry) iter.next();
            wantsMore = v.visitClassMap((Class) entry.getKey(),
                entry.getValue());
        }

        // when wantsMore is true, iteration is stopped because the iterator
        // does not have more elements.
        return wantsMore;
    }

    public Object findFirstInstance(final Object key) {
        final MutableReference ref = new MutableReference(null);
        ClassMapVisitor visitor = new ClassMapVisitor() {
            public boolean visitClassMap(Class cls, Object obj) {
                if (cls.isInstance(key)) {
                    ref.value = obj;
                    return false;
                }
                return true;
            }
        };
        visitClasses(visitor);
        return ref.value;
    }

    public Object getMappedObject(Class key) {
        return getMappings().get(key);
    }

    protected abstract Map createMappings();

    protected Map getMappings() {
        if (_mappings == null) {
            _mappings = createMappings();
        };
        return _mappings;
    }

    private Map _mappings;
}

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