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DSL based modeling framework - facilities common base
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package org.joinedworkz.common.helper;

import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import javax.inject.Inject;
import javax.inject.Singleton;

@Singleton
public class NameHelper {
	
	@Inject
	private Inflector inflector;
	
	public boolean hasValue(String s) {
		return s != null && s.length() > 0;
	}
	
	public String toFirstUpper(String s) {
		if (hasValue(s)) {
			char first = Character.toUpperCase(s.charAt(0));
			return first + s.substring(1);
		}
		return s;
	}
	
	public String underLineSeperatedToCamelCase(String s) {
		return charSeperatedToCamelCase(s, '_', false);
	}
	
	public String spaceSeperatedToCamelCase(String s) {
		return charSeperatedToCamelCase(s, ' ', false);
	}
	
	public String charSeperatedToCamelCase(String s, char c, boolean keepExistingCamelCase) {
		if (s == null || s.length() == 0) {
			return s;
		} 
		StringTokenizer columnNameTokenizer = new StringTokenizer(s,Character.valueOf(c).toString());
		boolean first=true;
		StringBuilder buffer = new StringBuilder();
		while (columnNameTokenizer.hasMoreTokens()) {
			String token = columnNameTokenizer.nextToken();
			if (!keepExistingCamelCase) {
				token = token.toLowerCase();
			}
			if (!first) {
				token = toFirstUpper(token);
			} else {
				first = false;
			}
			buffer.append(token);
		}
		return buffer.toString();
	}
	
	public String camelCaseToUnderLineSeperated(String s) {
		if (s == null || s.length() == 0) {
			return s;
		} 
		StringBuilder buffer = new StringBuilder();
		String[] nameParts = splitByCamelCase(s);
		boolean first=true;
		boolean previousWasUnderscore = false;
		for (String namePart : nameParts) {
			boolean isUnderscore = "_".equals(namePart);
			if (!first && !previousWasUnderscore && !isUnderscore) {
				buffer.append('_');
			} else {
				first = false;
			}
			buffer.append(namePart.toLowerCase());
			previousWasUnderscore = isUnderscore;
		}
		return buffer.toString();
	}
	
	public String camelCaseToDashSeperated(String s) {
		if (s == null || s.length() == 0) {
			return s;
		} 
		StringBuilder buffer = new StringBuilder();
		String[] nameParts = splitByCamelCase(s);
		boolean first=true;
		boolean previousWasUnderscore = false;
		for (String namePart : nameParts) {
			boolean isUnderscore = "-".equals(namePart);
			if (!first && !previousWasUnderscore && !isUnderscore) {
				buffer.append('-');
			} else {
				first = false;
			}
			buffer.append(namePart.toLowerCase());
			previousWasUnderscore = isUnderscore;
		}
		return buffer.toString();
	}
	
	public String camelCaseToSpaceSeperated(String s) {
		if (s == null || s.length() == 0) {
			return s;
		} 
		StringBuilder buffer = new StringBuilder();
		String[] nameParts = splitByCamelCase(s);
		boolean first=true;
		for (String namePart : nameParts) {
			if (!first) {
				buffer.append(' ');
			} else {
				first = false;
			}
			buffer.append(namePart);
		}
		return buffer.toString();
	}
	
	public String dashSeperatedToCamelCase(String s) {
		return charSeperatedToCamelCase(s, '-', false);
	}
	
    public String[] splitByCamelCase(String str) {
	    return splitByCharacterType(str, true);
    }

    protected String[] splitByCharacterType(String str, boolean camelCase) {
        if (str == null) {
               return null;
            }
            if (str.length() == 0) {
                return new String[] {};
            }
            char[] c = str.toCharArray();
            List list = new ArrayList();
            int tokenStart = 0;
            int currentType = Character.getType(c[tokenStart]);
            for (int pos = tokenStart + 1; pos < c.length; pos++) {
                int type = Character.getType(c[pos]);
                if (type == currentType) {
                    continue;
                }
                if (camelCase && type == Character.LOWERCASE_LETTER && currentType == Character.UPPERCASE_LETTER) {
                   int newTokenStart = pos - 1;
                   if (newTokenStart != tokenStart) {
                       list.add(new String(c, tokenStart, newTokenStart - tokenStart));
                        tokenStart = newTokenStart;
                    }
              } else {
                  list.add(new String(c, tokenStart, pos - tokenStart));
                   tokenStart = pos;
                }
               currentType = type;
            }
            list.add(new String(c, tokenStart, c.length - tokenStart));
           return list.toArray(new String[list.size()]);
      }
    
	public String abbreviateCamelCase(String s, int maxLength) {
		if (s == null || s.length() == 0) {
			return s;
		}
		StringTokenizer columnNameTokenizer = new StringTokenizer(s,"_");
		boolean first=true;
		StringBuilder buffer = new StringBuilder();
		while (columnNameTokenizer.hasMoreTokens()) {
			String token = columnNameTokenizer.nextToken();
			if (!first) {
				buffer.append('_');
			} else {
				first = false;
			}
			buffer.append(limit(token, maxLength));
		}
		return buffer.toString();
	}
	
	public String camelCaseToSinglar(String s) {
		if (s != null) {
			String[] parts = splitByCamelCase(s);
			String lastPart = parts[parts.length -1];
			StringBuilder buffer = new StringBuilder();
			for (int i=0;imaxLength) {
			return s.substring(0, maxLength);
		} else {
			return s;
		}
	}

}