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/**
 * Copyright (C) 2012 - 101loops.com 
 *
 * 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 com.crashnote.external.config.impl;

final class SubstitutionExpression {

    final private Path path;
    final private boolean optional;

    SubstitutionExpression(final Path path, final boolean optional) {
        this.path = path;
        this.optional = optional;
    }

    Path path() {
        return path;
    }

    boolean optional() {
        return optional;
    }

    SubstitutionExpression changePath(final Path newPath) {
        if (newPath == path)
            return this;
        else
            return new SubstitutionExpression(newPath, optional);
    }

    @Override
    public String toString() {
        return "${" + (optional ? "?" : "") + path.render() + "}";
    }

    @Override
    public boolean equals(final Object other) {
        if (other instanceof SubstitutionExpression) {
            final SubstitutionExpression otherExp = (SubstitutionExpression) other;
            return otherExp.path.equals(this.path) && otherExp.optional == this.optional;
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        int h = 41 * (41 + path.hashCode());
        h = 41 * (h + (optional ? 1 : 0));
        return h;
    }
}