npanday.executable.execution.switches.SwitchFormat.java Source code

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Here is the source code for npanday.executable.execution.switches.SwitchFormat.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 npanday.executable.execution.switches;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SwitchFormat {
    char leadChar;

    char valueOperatorChar;

    String switchNamePattern;

    Pattern switchPattern;

    public SwitchFormat(char leadChar, char valueOperatorChar) {
        this(leadChar, "\\w+", valueOperatorChar);
    }

    public SwitchFormat(char leadChar, String switchNamePattern, char valueOperatorChar) {
        this.leadChar = leadChar;
        this.valueOperatorChar = valueOperatorChar;
        this.switchNamePattern = switchNamePattern;

        this.switchPattern = Pattern.compile(Pattern.quote(String.valueOf(leadChar)) + "(" + switchNamePattern + ")"
                + Pattern.quote(String.valueOf(valueOperatorChar)) + "(.+)");
    }

    public boolean isMatchingSwitch(String argument) {
        // TODO: is performance relevant here?
        return switchPattern.matcher(argument).matches();
    }

    public Switch parse(String argument) {
        final Matcher matcher = switchPattern.matcher(argument);
        if (!matcher.matches()) {
            throw new IllegalArgumentException(
                    "NPANDAY-134-000: Argument '" + argument + "' is not of format " + toString());
        }

        // first group will always be the switch name, last always the (.*) for the value
        return new Switch(this, matcher.group(1), matcher.group(matcher.groupCount()));
    }

    public String generate(String switchName, String switchValue) {
        return leadChar + switchName + valueOperatorChar + switchValue;
    }

    @Override
    public String toString() {
        return "SwitchFormat{leadChar=" + leadChar + ", valueOperatorChar=" + valueOperatorChar
                + ", switchNamePattern=/" + switchNamePattern + "/}";
    }

    static Splitter SPLIT_ON_SEMICOLON = Splitter.on(';');

    public static SwitchFormat fromStringDefinition(String formatDefinition) {
        String[] args = Iterables.toArray(SPLIT_ON_SEMICOLON.split(formatDefinition), String.class);
        return new SwitchFormat(args[0].charAt(0), args[1], args[2].charAt(0));
    }
}