Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You 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.
/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 org.apache.bcel.classfile;

import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.bcel.Const;

This attribute exists for local or
anonymous classes and ... there can be only one.
Since:
6.0/**
 * This attribute exists for local or
 * anonymous classes and ... there can be only one.
 *
 * @since 6.0
 */
public class EnclosingMethod extends Attribute {

    // Pointer to the CONSTANT_Class_info structure representing the
    // innermost class that encloses the declaration of the current class.
    private int classIndex;

    // If the current class is not immediately enclosed by a method or
    // constructor, then the value of the method_index item must be zero.
    // Otherwise, the value of the  method_index item must point to a
    // CONSTANT_NameAndType_info structure representing the name and the
    // type of a method in the class referenced by the class we point
    // to in the class_index.  *It is the compiler responsibility* to
    // ensure that the method identified by this index is the closest
    // lexically enclosing method that includes the local/anonymous class.
    private int methodIndex;

    // Ctors - and code to read an attribute in.
    EnclosingMethod(final int nameIndex, final int len, final DataInput input, final ConstantPool cpool) throws IOException {
        this(nameIndex, len, input.readUnsignedShort(), input.readUnsignedShort(), cpool);
    }

    private EnclosingMethod(final int nameIndex, final int len, final int classIdx,final int methodIdx, final ConstantPool cpool) {
        super(Const.ATTR_ENCLOSING_METHOD, nameIndex, len, cpool);
        classIndex  = classIdx;
        methodIndex = methodIdx;
    }

    @Override
    public void accept(final Visitor v) {
      v.visitEnclosingMethod(this);
    }

    @Override
    public Attribute copy(final ConstantPool constant_pool) {
        return (Attribute) clone();
    }

    // Accessors
    public final int getEnclosingClassIndex() {
        return classIndex;
    }

    public final int getEnclosingMethodIndex() {
        return methodIndex;
    }

    public final void setEnclosingClassIndex(final int idx) {
        classIndex = idx;
    }

    public final void setEnclosingMethodIndex(final int idx) {
        methodIndex = idx;
    }

    public final ConstantClass getEnclosingClass() {
        final ConstantClass c =
            (ConstantClass)super.getConstantPool().getConstant(classIndex,Const.CONSTANT_Class);
        return c;
    }

    public final ConstantNameAndType getEnclosingMethod() {
        if (methodIndex == 0) {
            return null;
        }
        final ConstantNameAndType nat =
            (ConstantNameAndType)super.getConstantPool().getConstant(methodIndex,Const.CONSTANT_NameAndType);
        return nat;
    }

    @Override
    public final void dump(final DataOutputStream file) throws IOException {
        super.dump(file);
        file.writeShort(classIndex);
        file.writeShort(methodIndex);
    }
}