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/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 org.snapscript.dx;

import org.snapscript.dx.rop.cst.CstFieldRef;
import org.snapscript.dx.rop.cst.CstNat;
import org.snapscript.dx.rop.cst.CstString;

/**
 * Identifies a field.
 *
 * @param  the type declaring this field
 * @param  the type of value this field holds
 */
public final class FieldId {
    final TypeId declaringType;
    final TypeId type;
    final String name;

    /** cached converted state */
    final CstNat nat;
    final CstFieldRef constant;

    FieldId(TypeId declaringType, TypeId type, String name) {
        if (declaringType == null || type == null || name == null) {
            throw new NullPointerException();
        }
        this.declaringType = declaringType;
        this.type = type;
        this.name = name;
        this.nat = new CstNat(new CstString(name), new CstString(type.name));
        this.constant = new CstFieldRef(declaringType.constant, nat);
    }

    public TypeId getDeclaringType() {
        return declaringType;
    }

    public TypeId getType() {
        return type;
    }

    public String getName() {
        return name;
    }

    @Override public boolean equals(Object o) {
        return o instanceof FieldId
                && ((FieldId) o).declaringType.equals(declaringType)
                && ((FieldId) o).name.equals(name);
    }

    @Override public int hashCode() {
        return declaringType.hashCode() + 37 * name.hashCode();
    }

    @Override public String toString() {
        return declaringType + "." + name;
    }
}