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SignatureUtils.java

/* *******************************************************************
 * Copyright (c) 2008 Contributors
 * 
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *   Andy Clement - refactored out of MemberImpl
 * ******************************************************************/
package org.aspectj.weaver;

import java.lang.reflect.Modifier;

public class SignatureUtils {

      public static String getSignatureString(Member m, World world) {
            MemberKind kind = m.getKind();
            if (kind == Member.METHOD) {
                  return getMethodSignatureString(m, world);
            } else if (kind == Member.CONSTRUCTOR) {
                  return getConstructorSignatureString(m, world);
            } else if (kind == Member.FIELD) {
                  return getFieldSignatureString(m, world);
            } else if (kind == Member.HANDLER) {
                  return getHandlerSignatureString(m, world);
            } else if (kind == Member.STATIC_INITIALIZATION) {
                  return getStaticInitializationSignatureString(m, world);
            } else if (kind == Member.ADVICE) {
                  return getAdviceSignatureString(m, world);
            } else if (kind == Member.MONITORENTER || kind == Member.MONITOREXIT) {
                  return getMonitorSignatureString(m, world);
            } else {
                  throw new BCException("Do not know the signature string for MemberKind " + kind);
            }
      }

      public static String getSignatureMakerName(Member m) {
            MemberKind kind = m.getKind();
            if (kind == Member.METHOD) {
                  return "makeMethodSig";
            } else if (kind == Member.CONSTRUCTOR) {
                  return "makeConstructorSig";
            } else if (kind == Member.FIELD) {
                  return "makeFieldSig";
            } else if (kind == Member.HANDLER) {
                  return "makeCatchClauseSig";
            } else if (kind == Member.STATIC_INITIALIZATION) {
                  return "makeInitializerSig";
            } else if (kind == Member.ADVICE) {
                  return "makeAdviceSig";
            } else if (kind == Member.MONITORENTER) {
                  return "makeLockSig";
            } else if (kind == Member.MONITOREXIT) {
                  return "makeUnlockSig";
            } else {
                  throw new BCException("Do not know the signature maker name for MemberKind " + kind);
            }
      }

      public static String getSignatureType(Member m) {
            MemberKind kind = m.getKind();
            if (m.getName().equals("<clinit>") && kind != Member.STATIC_INITIALIZATION)
                  throw new BCException();
            // if (m.getName().equals("<clinit>")) return "org.aspectj.lang.reflect.InitializerSignature";

            if (kind == Member.METHOD) {
                  return "org.aspectj.lang.reflect.MethodSignature";
            } else if (kind == Member.CONSTRUCTOR) {
                  return "org.aspectj.lang.reflect.ConstructorSignature";
            } else if (kind == Member.FIELD) {
                  return "org.aspectj.lang.reflect.FieldSignature";
            } else if (kind == Member.HANDLER) {
                  return "org.aspectj.lang.reflect.CatchClauseSignature";
            } else if (kind == Member.STATIC_INITIALIZATION) {
                  return "org.aspectj.lang.reflect.InitializerSignature";
            } else if (kind == Member.ADVICE) {
                  return "org.aspectj.lang.reflect.AdviceSignature";
            } else if (kind == Member.MONITORENTER) {
                  return "org.aspectj.lang.reflect.LockSignature";
            } else if (kind == Member.MONITOREXIT) {
                  return "org.aspectj.lang.reflect.UnlockSignature";
            } else {
                  throw new BCException("Do not know the signature type for MemberKind " + kind);
            }
      }

      // ---

      private static String getHandlerSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(0));
            buf.append('-');
            // buf.append(getName());
            buf.append('-');
            buf.append(makeString(m.getDeclaringType()));
            buf.append('-');
            buf.append(makeString(m.getParameterTypes()[0]));
            buf.append('-');
            String pName = "<missing>";
            String[] names = m.getParameterNames(world);
            if (names != null)
                  pName = names[0];
            buf.append(pName);
            buf.append('-');
            return buf.toString();
      }

      private static String getStaticInitializationSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(m.getModifiers(world)));
            buf.append('-');
            // buf.append(getName());
            buf.append('-');
            buf.append(makeString(m.getDeclaringType()));
            buf.append('-');
            return buf.toString();
      }

      protected static String getAdviceSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(m.getModifiers(world)));
            buf.append('-');
            buf.append(m.getName());
            buf.append('-');
            buf.append(makeString(m.getDeclaringType()));
            buf.append('-');
            buf.append(makeString(m.getParameterTypes()));
            buf.append('-');
            buf.append(makeString(m.getParameterNames(world)));
            buf.append('-');
            buf.append(makeString(m.getExceptions(world)));
            buf.append('-');
            buf.append(makeString(m.getReturnType()));
            buf.append('-');
            return buf.toString();
      }

      protected static String getMethodSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(m.getModifiers(world)));
            buf.append('-');
            buf.append(m.getName());
            buf.append('-');
            buf.append(makeString(m.getDeclaringType()));
            buf.append('-');
            buf.append(makeString(m.getParameterTypes()));
            buf.append('-');
            buf.append(makeString(m.getParameterNames(world)));
            buf.append('-');
            buf.append(makeString(m.getExceptions(world)));
            buf.append('-');
            buf.append(makeString(m.getReturnType()));
            buf.append('-');
            return buf.toString();
      }

      protected static String getMonitorSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(Modifier.STATIC)); // modifiers
            buf.append('-');
            buf.append(m.getName()); // name
            buf.append('-');
            buf.append(makeString(m.getDeclaringType())); // Declaring Type
            buf.append('-');
            buf.append(makeString(m.getParameterTypes()[0])); // Parameter Types
            buf.append('-');
            buf.append(""); // Parameter names
            buf.append('-');
            return buf.toString();
      }

      protected static String getConstructorSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(m.getModifiers(world)));
            buf.append('-');
            buf.append('-');
            buf.append(makeString(m.getDeclaringType()));
            buf.append('-');
            buf.append(makeString(m.getParameterTypes()));
            buf.append('-');
            buf.append(makeString(m.getParameterNames(world)));
            buf.append('-');
            buf.append(makeString(m.getExceptions(world)));
            buf.append('-');
            return buf.toString();
      }

      protected static String getFieldSignatureString(Member m, World world) {
            StringBuffer buf = new StringBuffer();
            buf.append(makeString(m.getModifiers(world)));
            buf.append('-');
            buf.append(m.getName());
            buf.append('-');
            buf.append(makeString(m.getDeclaringType()));
            buf.append('-');
            buf.append(makeString(m.getReturnType()));
            buf.append('-');
            return buf.toString();
      }

      protected static String makeString(int i) {
            return Integer.toString(i, 16);
      }

      protected static String makeString(UnresolvedType t) {
            // this is the inverse of the odd behavior for Class.forName w/ arrays
            if (t.isArray()) {
                  // this behavior matches the string used by the eclipse compiler for Foo.class literals
                  return t.getSignature().replace('/', '.');
            } else {
                  return t.getName();
            }
      }

      protected static String makeString(UnresolvedType[] types) {
            if (types == null)
                  return "";
            StringBuffer buf = new StringBuffer();
            for (int i = 0, len = types.length; i < len; i++) {
                  buf.append(makeString(types[i]));
                  buf.append(':');
            }
            return buf.toString();
      }

      protected static String makeString(String[] names) {
            if (names == null)
                  return "";
            StringBuffer buf = new StringBuffer();
            for (int i = 0, len = names.length; i < len; i++) {
                  buf.append(names[i]);
                  buf.append(':');
            }
            return buf.toString();
      }

}

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