stringdescriptor.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 45 行

/*
 * $Id: StringDescriptor.java,v 1.1 2003/11/25 11:41:20 epr Exp $
 */
package org.jnode.driver.usb;

/**
 * @author Ewout Prangsma ([e-mail])
 */
public class StringDescriptor extends AbstractDescriptor {

	/** The cached string */
	private String cachedString;
	
	/**
	 * @param data
	 * @param ofs
	 * @param len
	 */
	public StringDescriptor(byte[] data, int ofs, int len) {
		super(data, ofs, len);
	}

	/**
	 * @param size
	 */
	public StringDescriptor(int size) {
		super(size);
	}
	
	/**
	 * Gets the actual string.
	 */
	public final String getString() {
		if (cachedString == null) {
			final int strLen = (getLength() - 2) >> 1;
			final char[] str = new char[strLen];
			for (int i = 0; i < strLen; i++) {
				str[i] = getChar(2 + (i << 1));
			}
			cachedString = new String(str);
		}
		return cachedString;
	}	
}