com.google.singletondetector.visitors.SingletonUsageMethodVisitor.java Source code

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Here is the source code for com.google.singletondetector.visitors.SingletonUsageMethodVisitor.java

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/*
 * Copyright 2007 Google Inc.
 * 
 * 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.
 */
package com.google.singletondetector.visitors;

import com.google.singletondetector.SingletonDetector;

import org.objectweb.asm.Opcodes;

/**
 * Visitor object that is responsible for traversing a method and noting all
 * method calls and field references.Helps SingletonDetector determine which
 * classes use other classes.
 * 
 * @author David Rubel
 */
public class SingletonUsageMethodVisitor extends NoopMethodVisitor {
    // Reference to the singleton detector, used to call visit methods  
    SingletonDetector sd;

    public SingletonUsageMethodVisitor(SingletonDetector sd) {
        super();
        this.sd = sd;
    }

    @Override
    public void visitMethodInsn(int opcode, String referencedClass, String methodName, String desc) {
        if (opcode == Opcodes.INVOKESTATIC) {
            sd.invokeStatic(referencedClass, desc);
        }
    }

    @Override
    public void visitFieldInsn(int opcode, String owner, String name, String desc) {
        if ((opcode == Opcodes.GETSTATIC || opcode == Opcodes.PUTSTATIC) && desc.startsWith("L")) {
            sd.fieldInstruction(owner);
        }
    }
}