cpinfo.java

本人根据自己的实际情况

/**
 *
 */
package gen.info.constant;

import gen.ClassFile;
import gen.constvalue.CpInfoConst;
import java.io.DataOutputStream;
import java.io.IOException;

/**
 * constant pool information
 *
 * @author liuyi
 *
 */
public abstract class CpInfo implements CpInfoConst {
    
    protected int tag;
    
    protected short index;
    
    protected ClassFile classFile;
    
    public CpInfo(int tag, ClassFile classFile) {
        this.tag = tag;
        this.classFile = classFile;
        index = -1;
    }
    
    public int getTag() {
        return tag;
    }
    
    /**
     * @param size
     */
    public void setIndex(int size) {
        this.index = (short)size;
    }
    
    public short getIndex() {
        return index;
    }
    
    public boolean sameAs(CpInfo cpInfo) {
        if (tag != cpInfo.tag) {
            return false;
        } else {
            switch (tag) {
                case CpInfoConst.CONSTANT_Integer:
                    ConstantIntegerInfo intThis = (ConstantIntegerInfo) this;
                    ConstantIntegerInfo intThat = (ConstantIntegerInfo) cpInfo;
                    if (intThis.getBytes() != intThat.getBytes()) {
                        return false;
                    }
                    break;
                    
                    // case CpInfoConst.CONSTANT_Long:
                case CpInfoConst.CONSTANT_Float:
                    ConstantFloatInfo floatThis = (ConstantFloatInfo) this;
                    ConstantFloatInfo floatThat = (ConstantFloatInfo) cpInfo;
                    if (floatThis.getBytes() != floatThat.getBytes()) {
                        return false;
                    }
                    break;
                    
                    // case CpInfoConst.CONSTANT_Double:
                case CpInfoConst.CONSTANT_Utf8:
                    ConstantUtf8Info utf8This = (ConstantUtf8Info) this;
                    ConstantUtf8Info utf8That = (ConstantUtf8Info) cpInfo;
                    if (!new String(utf8This.getBytes()).equals(new String(utf8That.getBytes()))) {
                        return false;
                    }
                    break;
                    
                case CpInfoConst.CONSTANT_String:
                    ConstantStringInfo strthis = (ConstantStringInfo) this;
                    ConstantStringInfo strthat = (ConstantStringInfo) cpInfo;
                    if(strthis.getStringIndex() != strthat.getStringIndex()){
                        return false;
                    }
                    break;
                    
                case CpInfoConst.CONSTANT_Fieldref:
                    ConstantFieldrefInfo fieldthis = (ConstantFieldrefInfo) this;
                    ConstantFieldrefInfo fieldthat = (ConstantFieldrefInfo) cpInfo;
                    if(fieldthis.getClassIndex() != fieldthat.getClassIndex() 
                        || fieldthis.getNameAndTypeIndex() != fieldthat.getNameAndTypeIndex()){
                        return false;
                    }
                    break;
                    
                case CpInfoConst.CONSTANT_Methodref:
                    ConstantMethodrefInfo methodthis = (ConstantMethodrefInfo) this;
                    ConstantMethodrefInfo methodthat = (ConstantMethodrefInfo) cpInfo;
                    if(methodthis.getClassIndex() != methodthat.getClassIndex() 
                        || methodthis.getNameAndTypeIndex() != methodthat.getNameAndTypeIndex()){
                        return false;
                    }
                    break;
                    
                case CpInfoConst.CONSTANT_Class:
                    ConstantClassInfo classthis = (ConstantClassInfo) this;
                    ConstantClassInfo classthat = (ConstantClassInfo) cpInfo;
                    if(classthis.getNameIndex() != classthat.getNameIndex()){
                        return false;
                    }
                    break;
                    
                case CpInfoConst.CONSTANT_NameAndType:
                    ConstantNameAndTypeInfo NATthis = (ConstantNameAndTypeInfo) this;
                    ConstantNameAndTypeInfo NATthat = (ConstantNameAndTypeInfo) cpInfo;
                    if(NATthis.getNameIndex() != NATthat.getNameIndex() 
                    || NATthis.getDescriptorIndex() != NATthat.getDescriptorIndex()){
                        return false;
                    }
                    break;
                    
                default:
                    System.out.println("CpInfo/sameAs: haven't ever realized! tag: " + tag);
                    return false;
            }
        }
        
        return true;
    }
    
    public String getRefString(){
        throw new UnsupportedOperationException();
    }

    public void toBinary(DataOutputStream writer) throws IOException{
        throw new UnsupportedOperationException();
    }
}