org.aspectj/bcel-builder/src/main/java/org/aspectj/apache/bcel/generic/TABLESWITCH.java

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package org.aspectj.apache.bcel.generic;

import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.util.ByteSequence;

/**
 * TABLESWITCH - Switch within given range of values, i.e., low..high
 *
 * @version $Id: TABLESWITCH.java,v 1.5 2008/08/28 00:05:29 aclement Exp $
 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 * @see SWITCH
 */
public class TABLESWITCH extends InstructionSelect {

	/**
	 * @param match sorted array of match values, match[0] must be low value, match[match_length - 1] high value
	 * @param targets where to branch for matched values
	 * @param target default branch
	 */
	public TABLESWITCH(int[] match, InstructionHandle[] targets, InstructionHandle target) {
		super(org.aspectj.apache.bcel.Constants.TABLESWITCH, match, targets, target);

		// if (match_length==0) {
		// throw new RuntimeException("A tableswitch with no targets should be represented as a LOOKUPSWITCH");
		// }

		// Alignment remainder assumed 0 here, until dump time
		length = (short) (13 + matchLength * 4);
		fixedLength = length;
	}

	/**
	 * Dump instruction as byte code to stream out.
	 *
	 * @param out Output stream
	 */
	public void dump(DataOutputStream out) throws IOException {
		super.dump(out);

		int low = matchLength > 0 ? match[0] : 0;
		out.writeInt(low);

		int high = matchLength > 0 ? match[matchLength - 1] : 0;
		out.writeInt(high);

		// See aj bug pr104720
		// if (match_length==0) out.writeInt(0); // following the switch you need to supply "HIGH-LOW+1" entries

		for (int i = 0; i < matchLength; i++) {
			out.writeInt(indices[i] = getTargetOffset(targets[i]));
		}
	}

	/**
	 * Read needed data (e.g. index) from file.
	 */
	public TABLESWITCH(ByteSequence bytes) throws IOException {
		super(Constants.TABLESWITCH, bytes);

		int low = bytes.readInt();
		int high = bytes.readInt();

		matchLength = high - low + 1;
		fixedLength = (short) (13 + matchLength * 4);
		length = (short) (fixedLength + padding);

		match = new int[matchLength];
		indices = new int[matchLength];
		targets = new InstructionHandle[matchLength];

		for (int i = 0; i < matchLength; i++) {
			match[i] = low + i;
		}

		for (int i = 0; i < matchLength; i++) {
			indices[i] = bytes.readInt();
		}
	}

}