ASMSupport教程4.11 生成数组操作

av = newArrayWithValue(AClassFactory.getArrayClass(String[][].class), new Value[][]{new Value[]{s200, s201}, new Value[]{s210, s211}}); LocalVariable s2 = createArrayVariable("s2", AClassFactory.getArrayClass(String[][].class), false, av);</pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div>

int[][] i2 = new int[2][];
System.out.println("i2 = " + ArrayUtils.toString(i2));

String[] s1 = { "array \"s1\" first value", "array \"s1\" second value" };
System.out.println("s1 = " + ArrayUtils.toString(s1));

String[][] s2 = { { "s2[0][0]", "s2[0][1]" }, { "s2[1][0]", "s2[1][1]" } };
System.out.println("s2 = " + ArrayUtils.toString(s2));

//获取数组长度操作
System.out.println("length of s2 is " + s2.length);
System.out.println("length of s2[0] is " + s2[0].length);

//获取数组内容的操作
System.out.println("value of s2[0] is " + ArrayUtils.toString(s2[0]));
System.out.println("value of s2[0][0] is " + ArrayUtils.toString(s2[0][0]));

//为数组内容赋值的操作
s2[0] = new String[]{ "new s2[0][0]", "new s2[0][1]" };
s2[1][0] = "new s2[1][0]";
System.out.println("new value of s2 is : " + ArrayUtils.toString(s2));

}</pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div>

import org.apache.commons.lang.ArrayUtils; import org.objectweb.asm.Opcodes;

import jw.asmsupport.Parameterized; import jw.asmsupport.block.method.common.StaticMethodBody; import jw.asmsupport.clazz.AClass; import jw.asmsupport.clazz.AClassFactory; import jw.asmsupport.creator.ClassCreator; import jw.asmsupport.definition.value.Value; import jw.asmsupport.definition.variable.LocalVariable; import jw.asmsupport.operators.array.ArrayValue;

import example.AbstractExample;

/**

• 在这个例子中我们将实现数组的相关操作

• @author 温斯群(Joe Wen)

*/ public class ArrayOperatorGenerate extends AbstractExample {

/**
 * @param args
 */
public static void main(String[] args) {
	ClassCreator creator = new ClassCreator(Opcodes.V1_5, Opcodes.ACC_PUBLIC , "generated.operators.ArrayOperatorGenerateExample", null, null);
	
	creator.createStaticMethod("main", new AClass[]{AClassFactory.getProductClass(String[].class)}, new String[]{"args"}, null, null,
			Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, new StaticMethodBody(){

		@Override
		public void generateBody(LocalVariable... argus) {
			/*
			 * 1.首先我们需要创建一个数组。我们有两只方式创建数组，第一种是在创建数组的时候
			 *   为其分配数组空间。第二种是创建数组的时候为其分配初试值
			 */
			//int[][] i1 = new int[1][2];
			//System.out.println(ArrayUtils.toString(i1));
			
			/*
			 * 
			 * 对应如下代码：
			 * int[][] i1 = new int[1][2];
			 * System.out.println("i1 = " + ArrayUtils.toString(i1));
			 */
			ArrayValue av = newArray(AClassFactory.getArrayClass(int[][].class), Value.value(2), Value.value(2));
			LocalVariable i1 = createArrayVariable("i1", AClassFactory.getArrayClass(int[][].class), false, av);
			invoke(systemOut, "println", append(Value.value("i1 = "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", i1)));
			
			/*
			 * 下面一段代码将生成如下代码：
			 * int[][] i2 = new int[2][];
	         * System.out.println("i2 = " + ArrayUtils.toString(i2));
			 */
			av = newArray(AClassFactory.getArrayClass(int[][].class), Value.value(2));
			LocalVariable i2 = createArrayVariable("i2", AClassFactory.getArrayClass(int[][].class), false, av);
			invoke(systemOut, "println", append(Value.value("i2 = "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", i2)));
			
			/*
			 * 对应如下代码：
			 * String[] s1 = new String[]{"array \"s1\" first value", "array \"s1\" second value"};
			 * System.out.println("s1 = " + ArrayUtils.toString(s1));
			 */
			av = newArrayWithValue(AClassFactory.getArrayClass(String[].class), new Value[]{Value.value("array \"s1\" first value"), Value.value("array \"s1\" second value")});
			LocalVariable s1 = createArrayVariable("s1", AClassFactory.getArrayClass(String[].class), false, av);
			invoke(systemOut, "println", append(Value.value("s1 = "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", s1)));

			/*
			 * 对应如下代码：
			 * String[][] s2 = {{"s2[0][0]", "s2[0][1]"},{"s2[1][0]", "s2[1][1]"}};
	         * System.out.println("s2 = " + ArrayUtils.toString(s2));
			 */
			Value s200 = Value.value("s2[0][0]");
			Value s201 = Value.value("s2[0][1]");
			Value s210 = Value.value("s2[1][0]");
			Value s211 = Value.value("s2[1][1]");
			
			av = newArrayWithValue(AClassFactory.getArrayClass(String[][].class), 
					new Value[][]{new Value[]{s200, s201}, new Value[]{s210, s211}});
			LocalVariable s2 = createArrayVariable("s2", AClassFactory.getArrayClass(String[][].class), false, av);
			invoke(systemOut, "println", append(Value.value("s2 = "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", s2)));

			/*
			 * 接下来我们将获取数组的长度：
			 * 代码如下：
			 * System.out.println("length of s2 is " + s2.length);
			 * System.out.println("length of s2[0] is " + s2[0].length);
			 */
			invoke(systemOut, "println", append(Value.value("length of s2 is "), arrayLength(s2)));
			invoke(systemOut, "println", append(Value.value("length of s2[0] is "), arrayLength(s2, Value.value(0))));

			/*
			 * 接下来我们将实现如何获取数组的值
			 * 代码如下：
			 * System.out.println("value of s2[0] is " + ArrayUtils.toString(s2[0]));
			 * System.out.println("value of s2[0][0] is " + s2[0][0]);
			 */
			//s2[0]
			Parameterized arrayLoader = arrayLoad(s2, Value.value(0));
			invoke(systemOut, "println", append(Value.value("value of s2[0] is "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", arrayLoader)));
			
			//s2[0][0]
			arrayLoader = arrayLoad(s2, Value.value(0), Value.value(0));
			invoke(systemOut, "println", append(Value.value("value of s2[0][0] is "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", arrayLoader)));
			
			/*
			 * 接下来是如何实现为数组单元赋值的操作
			 * 代码如下
			 * s2[0] = new String[]{"new s2[0][0]", "new s2[0][1]"};
			 * s2[1][0] = "new s2[1][0]"
			 * System.out.println("new value of s2 is : " + ArrayUtils.toString(s2));
			 */
			arrayStore(s2, newArrayWithValue(AClassFactory.getArrayClass(String[].class), new Parameterized[]{Value.value("new s2[0][0]"), Value.value("new s2[0][1]")}), Value.value(0));
			arrayStore(s2, Value.value("new s2[1][0]"), Value.value(1), Value.value(0));
			invoke(systemOut, "println", append(Value.value("new value of s2 is : "), invokeStatic(AClassFactory.getProductClass(ArrayUtils.class), "toString", s2)));
			
			runReturn();
		}
    });
	generate(creator);
}

} </pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div>