/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2005 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.mvel2.asm.util;

import org.mvel2.asm.AnnotationVisitor;
import org.mvel2.asm.Type;

/**
 * An {@link AnnotationVisitor} that prints a disassembled view of the
 * annotations it visits.
 *
 * @author Eric Bruneton
 */
public class TraceAnnotationVisitor extends TraceAbstractVisitor implements
    AnnotationVisitor {

  /**
   * The {@link AnnotationVisitor} to which this visitor delegates calls. May
   * be <tt>null</tt>.
   */
  protected AnnotationVisitor av;

  private int valueNumber = 0;

  /**
   * Constructs a new {@link TraceAnnotationVisitor}.
   */
  public TraceAnnotationVisitor() {
    // ignore
  }

  // ------------------------------------------------------------------------
  // Implementation of the AnnotationVisitor interface
  // ------------------------------------------------------------------------

  public void visit(final String name, final Object value) {
    buf.setLength(0);
    appendComa(valueNumber++);

    if (name != null) {
      buf.append(name).append('=');
    }

    if (value instanceof String) {
      visitString((String) value);
    }
    else if (value instanceof Type) {
      visitType((Type) value);
    }
    else if (value instanceof Byte) {
      visitByte(((Byte) value).byteValue());
    }
    else if (value instanceof Boolean) {
      visitBoolean(((Boolean) value).booleanValue());
    }
    else if (value instanceof Short) {
      visitShort(((Short) value).shortValue());
    }
    else if (value instanceof Character) {
      visitChar(((Character) value).charValue());
    }
    else if (value instanceof Integer) {
      visitInt(((Integer) value).intValue());
    }
    else if (value instanceof Float) {
      visitFloat(((Float) value).floatValue());
    }
    else if (value instanceof Long) {
      visitLong(((Long) value).longValue());
    }
    else if (value instanceof Double) {
      visitDouble(((Double) value).doubleValue());
    }
    else if (value.getClass().isArray()) {
      buf.append('{');
      if (value instanceof byte[]) {
        byte[] v = (byte[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitByte(v[i]);
        }
      }
      else if (value instanceof boolean[]) {
        boolean[] v = (boolean[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitBoolean(v[i]);
        }
      }
      else if (value instanceof short[]) {
        short[] v = (short[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitShort(v[i]);
        }
      }
      else if (value instanceof char[]) {
        char[] v = (char[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitChar(v[i]);
        }
      }
      else if (value instanceof int[]) {
        int[] v = (int[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitInt(v[i]);
        }
      }
      else if (value instanceof long[]) {
        long[] v = (long[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitLong(v[i]);
        }
      }
      else if (value instanceof float[]) {
        float[] v = (float[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitFloat(v[i]);
        }
      }
      else if (value instanceof double[]) {
        double[] v = (double[]) value;
        for (int i = 0; i < v.length; i++) {
          appendComa(i);
          visitDouble(v[i]);
        }
      }
      buf.append('}');
    }

    text.add(buf.toString());

    if (av != null) {
      av.visit(name, value);
    }
  }

  private void visitInt(final int value) {
    buf.append(value);
  }

  private void visitLong(final long value) {
    buf.append(value).append('L');
  }

  private void visitFloat(final float value) {
    buf.append(value).append('F');
  }

  private void visitDouble(final double value) {
    buf.append(value).append('D');
  }

  private void visitChar(final char value) {
    buf.append("(char)").append((int) value);
  }

  private void visitShort(final short value) {
    buf.append("(short)").append(value);
  }

  private void visitByte(final byte value) {
    buf.append("(byte)").append(value);
  }

  private void visitBoolean(final boolean value) {
    buf.append(value);
  }

  private void visitString(final String value) {
    appendString(buf, value);
  }

  private void visitType(final Type value) {
    buf.append(value.getClassName()).append(".class");
  }

  public void visitEnum(
      final String name,
      final String desc,
      final String value) {
    buf.setLength(0);
    appendComa(valueNumber++);
    if (name != null) {
      buf.append(name).append('=');
    }
    appendDescriptor(FIELD_DESCRIPTOR, desc);
    buf.append('.').append(value);
    text.add(buf.toString());

    if (av != null) {
      av.visitEnum(name, desc, value);
    }
  }

  public AnnotationVisitor visitAnnotation(
      final String name,
      final String desc) {
    buf.setLength(0);
    appendComa(valueNumber++);
    if (name != null) {
      buf.append(name).append('=');
    }
    buf.append('@');
    appendDescriptor(FIELD_DESCRIPTOR, desc);
    buf.append('(');
    text.add(buf.toString());
    TraceAnnotationVisitor tav = createTraceAnnotationVisitor();
    text.add(tav.getText());
    text.add(")");
    if (av != null) {
      tav.av = av.visitAnnotation(name, desc);
    }
    return tav;
  }

  public AnnotationVisitor visitArray(final String name) {
    buf.setLength(0);
    appendComa(valueNumber++);
    if (name != null) {
      buf.append(name).append('=');
    }
    buf.append('{');
    text.add(buf.toString());
    TraceAnnotationVisitor tav = createTraceAnnotationVisitor();
    text.add(tav.getText());
    text.add("}");
    if (av != null) {
      tav.av = av.visitArray(name);
    }
    return tav;
  }

  public void visitEnd() {
    if (av != null) {
      av.visitEnd();
    }
  }

  // ------------------------------------------------------------------------
  // Utility methods
  // ------------------------------------------------------------------------

  private void appendComa(final int i) {
    if (i != 0) {
      buf.append(", ");
    }
  }
}
