configurations.java

java 编写的程序

			throw new ClassCastException(key
				+ " doesn't map to a Float object");
		}
	}
	/**
	 * Get a int associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated int.
	 * @exception NoSuchElementException is thrown if the key doesn't
	 * map to an existing object.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Integer.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public int getInteger(String key) {
		Integer i = this.getInteger(key, null);
		if (i != null) {
			return i.intValue();
		} else {
			throw new NoSuchElementException(key
				+ " doesn't map to an existing object");
		}
	}
	/**
	 * Get a int associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated int.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Integer.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public int getInteger(String key, int defaultValue) {
		return this.getInteger(key, new Integer(defaultValue)).intValue();
	}
	/**
	 * Get a int associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated int if key is found and has valid format,
	 * default value otherwise.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Integer.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public Integer getInteger(String key, Integer defaultValue) {
		Object value = repository.get(key);

		if (value instanceof Integer) {
			return (Integer) value;
		} else if (value instanceof String) {
			Integer i = new Integer((String) value);
			repository.put(key, i);
			return i;
		} else if (value == null) {
			if (defaults != null) {
				return defaults.getInteger(key, defaultValue);
			} else {
				return defaultValue;
			}
		} else {
			throw new ClassCastException(key
				+ " doesn't map to a Integer object");
		}
	}
	/**
	 * Get the list of the keys contained in the
	 * configuration repository.
	 */
	public Enumeration getKeys() {
		return this.repository.keys();
	}
	/**
	 * Get a list of strings associated with the
	 * given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated list.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Vector.
	 */
	public Enumeration getList(String key) {
		return this.getVector(key, null).elements();
	}
	/**
	 * Get a long associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated long.
	 * @exception NoSuchElementException is thrown if the key doesn't
	 * map to an existing object.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Long.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public long getLong(String key) {
		Long l = this.getLong(key, null);
		if (l != null) {
			return l.longValue();
		} else {
			throw new NoSuchElementException(key
				+ " doesn't map to an existing object");
		}
	}
	/**
	 * Get a long associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated long.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Long.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public long getLong(String key, long defaultValue) {
		return this.getLong(key, new Long(defaultValue)).longValue();
	}
	/**
	 * Get a long associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated long if key is found and has valid format,
	 * default value otherwise.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Long.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public Long getLong(String key, Long defaultValue) {
		Object value = repository.get(key);

		if (value instanceof Long) {
			return (Long) value;
		} else if (value instanceof String) {
			Long l = new Long((String) value);
			repository.put(key, l);
			return l;
		} else if (value == null) {
			if (defaults != null) {
				return defaults.getLong(key, defaultValue);
			} else {
				return defaultValue;
			}
		} else {
			throw new ClassCastException(key
				+ " doesn't map to a Long object");
		}
	}
	/**
	 * Get a list of properties associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated properties if key is found
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a String/Vector
	 * @exception IllegalArgumentException if one of the tokens is
	 * malformed (does not contain an equals sign)
	 */
	public Properties getProperties(String key) {
	  return getProperties(key, new Properties());
	}
	/**
	 * Get a list of properties associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated properties if key is found
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a String/Vector
	 * @exception IllegalArgumentException if one of the tokens is
	 * malformed (does not contain an equals sign)
	 */
	public Properties getProperties(String key, Properties defaults) {
		// Grab an array of the tokens for this key
		String[] tokens = getStringArray(key);

	// Each token is of the form 'key=value'.
	Properties props = new Properties(defaults);
	for (int i = 0; i < tokens.length; i++) {
	  String token = tokens[i];
	  int equalSign = token.indexOf('=');
	  if (equalSign > 0) {
		String pkey = token.substring(0, equalSign).trim();
		String pvalue = token.substring(equalSign + 1).trim();
		props.put(pkey, pvalue);
	  } else {
		throw new IllegalArgumentException("'" + token + "' does not contain an equals sign");
	  }
	}

	return props;
	}
	/**
	 * Get encapsulated configuration repository.
	 */
	public Hashtable getRepository() {
		return this.repository;
	}
	/**
	 * Get a short associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated short.
	 * @exception NoSuchElementException is thrown if the key doesn't
	 * map to an existing object.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Short.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public short getShort(String key) {
		Short s = this.getShort(key, null);
		if (s != null) {
			return s.shortValue();
		} else {
			throw new NoSuchElementException(key
				+ " doesn't map to an existing object");
		}
	}
	/**
	 * Get a short associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated short if key is found and has valid format,
	 * default value otherwise.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Short.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public Short getShort(String key, Short defaultValue) {
		Object value = repository.get(key);

		if (value instanceof Short) {
			return (Short) value;
		} else if (value instanceof String) {
			Short s = new Short((String) value);
			repository.put(key, s);
			return s;
		} else if (value == null) {
			if (defaults != null) {
				return defaults.getShort(key, defaultValue);
			} else {
				return defaultValue;
			}
		} else {
			throw new ClassCastException(key
				+ " doesn't map to a Short object");
		}
	}
	/**
	 * Get a short associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated short.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Short.
	 * @exception NumberFormatException is thrown if the value
	 * mapped by the key has not a valid number format.
	 */
	public short getShort(String key, short defaultValue) {
		return this.getShort(key, new Short(defaultValue)).shortValue();
	}
	/**
	 * Get a string associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated string.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a String.
	 */
	public String getString(String key) {
		return this.getString(key, null);
	}
	/**
	 * Get a string associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the default value.
	 * @return the associated string if key is found,
	 * default value otherwise.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a String.
	 */
	public String getString(String key, String defaultValue) {
		Object value = repository.get(key);

		if (value instanceof String) {
			return (String) value;
		} else if (value == null) {
			if (defaults != null) {
				return defaults.getString(key, defaultValue);
			} else {
				return defaultValue;
			}
		} else {
			throw new ClassCastException(key
				+ " doesn't map to a String object");
		}
	}
	/**
	 * Get an array of strings associated with the given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated string array if key is found,
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a String/Vector
	 */
	public String[] getStringArray(String key) {
		Object value = repository.get(key);

	// What's your vector, Victor?
	Vector vector;
		if (value instanceof String) {
	  vector = new Vector(1);
	  vector.addElement(value);
		} else if (value instanceof Vector) {
	  vector = (Vector)value;
	} else if (value == null) {
	  if (defaults != null) {
		return defaults.getStringArray(key);
	  } else {
		return new String[0];
	  }
	} else {
	  throw new ClassCastException(key + " doesn't map to a String/Vector object");
		}

	String[] tokens = new String[vector.size()];
	for (int i = 0; i < tokens.length; i++)
	  tokens[i] = (String)vector.elementAt(i);

	return tokens;
	}
	/**
	 * Get a Vector of strings associated with the
	 * given configuration key.
	 *
	 * @param key the configuration key.
	 * @return the associated Vector.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Vector.
	 */
	public Vector getVector(String key) {
		return this.getVector(key, null);
	}
	/**
	 * Get a Vector of strings associated with the
	 * given configuration key.
	 *
	 * @param key the configuration key.
	 * @param defaultValue the defaul value.
	 * @return the associated Vector.
	 * @exception ClassCastException is thrown if the key maps to an
	 * object that is not a Vector.
	 */
	public Vector getVector(String key, Vector defaultValue) {
		Object value = repository.get(key);

		if (value instanceof Vector) {
			return (Vector) value;
		} else if (value instanceof String) {
			Vector v = new Vector(1);
			v.addElement((String) value);
			repository.put(key, v);
			return v;
		} else if (value == null) {
			if (defaults != null) {
				return defaults.getVector(key, defaultValue);
			} else {
				return ((defaultValue == null)
					? new Vector() : defaultValue);
			}
		} else {
			throw new ClassCastException(key
				+ " doesn't map to a Vector object");
		}
	}
}