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/*
 * Copyright 2003-2012 the original author or authors.
 *
 * 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.codehaus.groovy.transform.stc;

import org.codehaus.groovy.ast.expr.Expression;

/**
 * An utility class used to wrap an expression with additional metadata used by the type checker.
 * In particular, this is used to detect closure shared variables misuses. We need in some circumstances
 * to store the method call expression and its argument types.
 *
 * @author Cedric Champeau
 */
class SecondPassExpression {
    private final Expression expression;
    private final T data;

    SecondPassExpression(final Expression expression) {
        this.expression = expression;
        this.data = null;
    }

    SecondPassExpression(final Expression expression, final T data) {
        this.data = data;
        this.expression = expression;
    }

    public T getData() {
        return data;
    }

    public Expression getExpression() {
        return expression;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        final SecondPassExpression that = (SecondPassExpression) o;

        if (data != null ? !data.equals(that.data) : that.data != null) return false;
        if (!expression.equals(that.expression)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = expression.hashCode();
        result = 31 * result + (data != null ? data.hashCode() : 0);
        return result;
    }
}