Examples of org.apache.velocity.context.AbstractContext

org.apache.velocity.context.AbstractContext
This class is the abstract base class for all conventional Velocity Context implementations. Simply extend this class and implement the abstract routines that access your preferred storage method. Takes care of context chaining. Also handles / enforces policy on null keys and values :
- Null keys and values are accepted and basically dropped.
- If you place an object into the context with a null key, it will be ignored and logged.
- If you try to place a null into the context with any key, it will be dropped and logged.
The default implementation of this for application use is org.apache.velocity.VelocityContext. All thanks to Fedor for the chaining idea. @author Geir Magnusson Jr. @author Fedor Karpelevitch @author Jason van Zyl @version $Id: AbstractContext.java 369043 2006-01-14 16:43:54Z henning $


        EventCartridge eventCartridge = new EventCartridge();
        eventCartridge.addEventHandler(new PropertiesReferenceInsertionHandler(currentGenerate.getConfigDescriptor(),
                props));


        Context context = new AbstractContext() {
            @Override
            public Object internalRemove(Object key) {
                return descriptorProps.remove(key);
            }


            @Override
            public Object internalPut(String key, Object value) {
                return descriptorProps.put(key, value);
            }


            @Override
            public Object[] internalGetKeys() {
                Set<Object> keys = new LinkedHashSet<Object>(props.keySet());
                keys.addAll(descriptorProps.keySet());
                return keys.toArray(new Object[keys.size()]);
            }


            @Override
            public Object internalGet(String key) {
                if (descriptorProps.containsKey(key)) {
                    return descriptorProps.get(key);
                } else {
                    return PropertiesLoader.evaluate(key, props);
                }
            }


            @Override
            public boolean internalContainsKey(Object key) {
                return descriptorProps.containsKey(key) || props.containsKey(key);
            }
        };


        eventCartridge.attachToContext(context); // ����ʹ��${a.b.c}
        context.put("D", "$"); // ������${D}������$


        return context;
    }

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        EventCartridge eventCartridge = new EventCartridge();
        eventCartridge.addEventHandler(new PropertiesReferenceInsertionHandler(currentGenerate.getConfigDescriptor(),
                                                                               props));


        Context context = new AbstractContext() {
            @Override
            public Object internalRemove(Object key) {
                return descriptorProps.remove(key);
            }


            @Override
            public Object internalPut(String key, Object value) {
                return descriptorProps.put(key, value);
            }


            @Override
            public Object[] internalGetKeys() {
                Set<Object> keys = new LinkedHashSet<Object>(props.keySet());
                keys.addAll(descriptorProps.keySet());
                return keys.toArray(new Object[keys.size()]);
            }


            @Override
            public Object internalGet(String key) {
                if (descriptorProps.containsKey(key)) {
                    return descriptorProps.get(key);
                } else {
                    return PropertiesLoader.evaluate(key, props);
                }
            }


            @Override
            public boolean internalContainsKey(Object key) {
                return descriptorProps.containsKey(key) || props.containsKey(key);
            }
        };


        eventCartridge.attachToContext(context); // 允许使用${a.b.c}
        context.put("D", "$"); // 可以用${D}来生成$


        return context;
    }

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        EventCartridge eventCartridge = new EventCartridge();
        eventCartridge.addEventHandler(new PropertiesReferenceInsertionHandler(currentGenerate.getConfigDescriptor(),
                props));


        Context context = new AbstractContext() {
            @Override
            public Object internalRemove(Object key) {
                return descriptorProps.remove(key);
            }


            @Override
            public Object internalPut(String key, Object value) {
                return descriptorProps.put(key, value);
            }


            @Override
            public Object[] internalGetKeys() {
                Set<Object> keys = new LinkedHashSet<Object>(props.keySet());
                keys.addAll(descriptorProps.keySet());
                return keys.toArray(new Object[keys.size()]);
            }


            @Override
            public Object internalGet(String key) {
                if (descriptorProps.containsKey(key)) {
                    return descriptorProps.get(key);
                } else {
                    return PropertiesLoader.evaluate(key, props);
                }
            }


            @Override
            public boolean internalContainsKey(Object key) {
                return descriptorProps.containsKey(key) || props.containsKey(key);
            }
        };


        eventCartridge.attachToContext(context); // ����ʹ��${a.b.c}
        context.put("D", "$"); // ������${D}������$


        return context;
    }

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