stringlengthcall.java

java1.6众多例子参考

/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: StringLengthCall.java,v 1.2.4.1 2005/09/05 09:08:46 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import java.util.Vector;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
final class StringLengthCall extends FunctionCall {
    public StringLengthCall(QName fname, Vector arguments) {
	super(fname, arguments);
    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = methodGen.getInstructionList();
	if (argumentCount() > 0) {
	    argument().translate(classGen, methodGen);
	}
	else {
	    il.append(methodGen.loadContextNode());
	    Type.Node.translateTo(classGen, methodGen, Type.String);
	}
	il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
						     "length", "()I")));
    }
}