Permissions.java

/*
 * Copyright 2014 Yaroslav Mytkalyk
 * 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.docd.purefm.file;

import java.io.Serializable;

public final class Permissions implements Serializable {

    private static final long serialVersionUID = 2682238088276963741L;
    
    public final boolean ur;
    public final boolean uw;
    public final boolean ux;
    
    public final boolean gr;
    public final boolean gw;
    public final boolean gx;
    
    public final boolean or;
    public final boolean ow;
    public final boolean ox;
    
    private final String output;
    
    public Permissions(boolean r, boolean w, boolean x) {
        this.ur = r;
        this.uw = w;
        this.ux = x;
        
        this.gr = false;
        this.gw = false;
        this.gx = false;
        
        this.or = false;
        this.ow = false;
        this.ox = false;
        
        @SuppressWarnings("StringBufferReplaceableByString")
        final StringBuilder sb = new StringBuilder();
        sb.append(ur ? 'r' : '-');
        sb.append(uw ? 'w' : '-');
        sb.append(ux ? 'x' : '-');
        this.output = sb.toString();
    }
    
    public Permissions(
            boolean ur, boolean uw, boolean ux,
            boolean gr, boolean gw, boolean gx,
            boolean or, boolean ow, boolean ox) {
        
        this.ur = ur;
        this.uw = uw;
        this.ux = ux;
        
        this.gr = gr;
        this.gw = gw;
        this.gx = gx;
        
        this.or = or;
        this.ow = ow;
        this.ox = ox;
        
        @SuppressWarnings("StringBufferReplaceableByString")
        final StringBuilder sb = new StringBuilder();
        sb.append(ur ? 'r' : '-');
        sb.append(uw ? 'w' : '-');
        sb.append(ux ? 'x' : '-');
        sb.append(gr ? 'r' : '-');
        sb.append(gw ? 'w' : '-');
        sb.append(gx ? 'x' : '-');
        sb.append(or ? 'r' : '-');
        sb.append(ow ? 'w' : '-');
        sb.append(ox ? 'x' : '-');
        this.output = sb.toString();
    }
    
    public Permissions(String line) {
        if (line.length() != 10) {
            throw new IllegalArgumentException("Bad permission line");
        }
        
        this.ur = line.charAt(1) == 'r';
        this.uw = line.charAt(2) == 'w';
        this.ux = line.charAt(3) == 'x';
        
        this.gr = line.charAt(4) == 'r';
        this.gw = line.charAt(5) == 'w';
        this.gx = line.charAt(6) == 'x';
        
        this.or = line.charAt(7) == 'r';
        this.ow = line.charAt(8) == 'w';
        this.ox = line.charAt(9) == 'x';
        
        @SuppressWarnings("StringBufferReplaceableByString")
        final StringBuilder sb = new StringBuilder();
        sb.append(ur ? 'r' : '-');
        sb.append(uw ? 'w' : '-');
        sb.append(ux ? 'x' : '-');
        sb.append(gr ? 'r' : '-');
        sb.append(gw ? 'w' : '-');
        sb.append(gx ? 'x' : '-');
        sb.append(or ? 'r' : '-');
        sb.append(ow ? 'w' : '-');
        sb.append(ox ? 'x' : '-');
        this.output = sb.toString();
    }
    
    @Override
    public String toString() {
        return this.output;
    }
    
    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Permissions)) {
            return false;
        }
        final Permissions p = (Permissions) o;
        return this.ur == p.ur && this.uw == p.uw && this.ux == p.ux &&
                this.gr == p.gr && this.gw == p.gw && this.gx == p.gx &&
                this.or == p.or && this.ow == p.ow && this.ox == p.ox;
    }

    @Override
    public int hashCode() {
        int result = (ur ? 1 : 0);
        result = 31 * result + (uw ? 1 : 0);
        result = 31 * result + (ux ? 1 : 0);
        result = 31 * result + (gr ? 1 : 0);
        result = 31 * result + (gw ? 1 : 0);
        result = 31 * result + (gx ? 1 : 0);
        result = 31 * result + (or ? 1 : 0);
        result = 31 * result + (ow ? 1 : 0);
        result = 31 * result + (ox ? 1 : 0);
        return result;
    }
}