package org.codehaus.plexus.interpolation.multi;

/*
 * Copyright 2001-2009 Codehaus Foundation.
 *
 * 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.
 */

public final class DelimiterSpecification {
    public static final DelimiterSpecification DEFAULT_SPEC = DelimiterSpecification.parse("${*}");

    private String begin;

    private String end;

    private int nextStart;

    public DelimiterSpecification(String begin, String end) {
        this.begin = begin;
        this.end = end;
    }

    public int getNextStartIndex() {
        return nextStart;
    }

    public void setNextStartIndex(int nextStart) {
        this.nextStart = nextStart;
    }

    public void clearNextStart() {
        nextStart = -1;
    }

    public static DelimiterSpecification parse(String delimiterSpec) {
        final String[] spec = new String[2];

        int splitIdx = delimiterSpec.indexOf('*');
        if (splitIdx < 0) {
            spec[0] = delimiterSpec;
            spec[1] = spec[0];
        } else if (splitIdx == delimiterSpec.length() - 1) {
            spec[0] = delimiterSpec.substring(0, delimiterSpec.length() - 1);
            spec[1] = spec[0];
        } else {
            spec[0] = delimiterSpec.substring(0, splitIdx);
            spec[1] = delimiterSpec.substring(splitIdx + 1);
        }

        return new DelimiterSpecification(spec[0], spec[1]);
    }

    public String getBegin() {
        return begin;
    }

    public String getEnd() {
        return end;
    }

    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((begin == null) ? 0 : begin.hashCode());
        result = prime * result + ((end == null) ? 0 : end.hashCode());
        return result;
    }

    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;
        DelimiterSpecification other = (DelimiterSpecification) obj;
        if (begin == null) {
            if (other.begin != null) return false;
        } else if (!begin.equals(other.begin)) return false;
        if (end == null) {
            if (other.end != null) return false;
        } else if (!end.equals(other.end)) return false;
        return true;
    }

    public String toString() {
        return "Interpolation delimiter [begin: '" + begin + "', end: '" + end + "']";
    }
}
