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Commonly used programming tasks in java

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package com.venky.core.collections;

import java.util.TreeMap;

import com.venky.core.checkpoint.Mergeable;
import com.venky.core.util.ObjectUtil;

public class IgnoreCaseMap extends TreeMap implements Cloneable, Mergeable>{
	private static final long serialVersionUID = 5311588254312204361L;

	protected String ucase(Object other){
		return UpperCaseStringCache.instance().get(String.valueOf(other));
	}

	@Override
	public boolean containsKey(Object key) {
		return super.containsKey(ucase(key));
	}

	@Override
	public V get(Object key) {
		return super.get(ucase(key));
	}

	@Override
	public V put(String key, V value) {
		return super.put(ucase(key), value);
	}

	@Override
	public V remove(Object key) {
		return super.remove(ucase(key));
	}

	@SuppressWarnings("unchecked")
	public IgnoreCaseMap clone(){
		IgnoreCaseMap clone = (IgnoreCaseMap) super.clone();
		ObjectUtil.cloneValues(clone);
		return clone;
	}

	public void merge(IgnoreCaseMap another) {
		ObjectUtil.mergeValues(another,this);
	}

}