require.java example

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/**
 * $Id: $
 * $Date: $
 *
 */

package org.xmlsh.builtin.commands;

import java.util.List;
import org.xmlsh.core.BuiltinCommand;
import org.xmlsh.core.Options.OptionDefs;
import org.xmlsh.core.Options;
import org.xmlsh.core.ThrowException;
import org.xmlsh.core.XValue;
import org.xmlsh.sh.shell.SerializeOpts;
import org.xmlsh.sh.shell.Version;
import org.xmlsh.sh.shell.Version.Op;

public class require extends BuiltinCommand {

  @Override
  protected int run(List<XValue> args) throws Exception {

    // Require with no args simply requires the require command exists
    // Added in version 1.0.1
    if(args.size() == 0)
      return 0;

    OptionDefs defs = new OptionDefs(
        "v=version,java=java-version,version-property:,property:,matches:,gt:,gte:,lt:,lte:,eq=equals:");
    Options opts = new Options(defs, SerializeOpts.getOptionDefs());
    opts.parse(args);
    args = opts.getRemainingArgs();

    String vtype = "version";
    String value = null;

    if(opts.hasOpt("v")) {
      vtype = "version";
      value = Version.getVersion();
    }
    else if(opts.hasOpt("java")) {
      vtype = "java";
      value = Version.getJavaVersion();
    }
    else if(opts.hasOpt("version-property")) {
      vtype = "version-property";
      value = Version
          .getProperty(opts.getOptStringRequired("version-property"));
    }
    else if(opts.hasOpt("property")) {
      vtype = "property";
      value = Version.getJavaProperty(opts.getOptStringRequired("property"));
    }
    Version.Op op = Op.GTE;
    String matches = null;

    for(String sop : new String[] { "gt", "lt", "gte", "lte", "eq",
        "matches" }) {
      if(opts.hasOpt(sop)) {
        op = Version.Op.getOp(sop);
        matches = opts.getOptStringRequired(sop);
        break;
      }
    }

    int ret = 0;
    if(matches == null) {

      requires(!args.isEmpty(), "Expected version match argument");
      matches = args.get(0).toString();
    }
    requires(op != null, "Missing matching operator");
    if(value == null)
      value = Version.getVersion();
    ret = Version.matches(value, matches, op) ? 0 : 1;

    if(ret == 0)
      return 0;
    if(mShell.isInCommandConndition())
      return 1;

    String err = "requires " + vtype + " " + value + " " + op.name() + " "
        + matches;
    printErr(err);
    throw new ThrowException(XValue.newXValue(err));

  }
}

//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (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.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//