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With inspiration from other libraries
There is a newer version: 2.12.15
/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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 org.mvel2.templates.util;

import org.mvel2.templates.TemplateError;
import org.mvel2.templates.res.Node;
import org.mvel2.templates.res.TerminalNode;

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import static java.nio.ByteBuffer.allocateDirect;
import static org.mvel2.util.ParseTools.balancedCapture;

public class TemplateTools {
  public static Node getLastNode(Node node) {
    Node n = node;
    while (true) {
      if (n.getNext() instanceof TerminalNode) return n;
      n = n.getNext();
    }
  }

  public static int captureToEOS(char[] expression, int cursor) {
    int length = expression.length;
    while (cursor != length) {
      switch (expression[cursor]) {
        case '(':
        case '[':
        case '{':
          cursor = balancedCapture(expression, cursor, expression[cursor]);
          break;

        case ';':
        case '}':
          return cursor;

      }
      cursor++;
    }

    return cursor;
  }

  public static String readInFile(String file) {
    return readInFile(new File(file));
  }

  public static String readInFile(File file) {
    try {
      FileChannel fc = new FileInputStream(file).getChannel();
      ByteBuffer buf = allocateDirect(10);
      StringBuilder appender = new StringBuilder();
      int read;

      while (true) {
        buf.rewind();
        if ((read = fc.read(buf)) != -1) {
          buf.rewind();
          for (; read != 0; read--) {
            appender.append((char) buf.get());
          }
        }
        else {
          break;
        }
      }

      fc.close();

      return appender.toString();
    }
    catch (FileNotFoundException e) {
      throw new TemplateError("cannot include template '" + file.getName() + "': file not found.");
    }
    catch (IOException e) {
      throw new TemplateError("unknown I/O exception while including '" + file.getName() + "' (stacktrace nested)", e);
    }
  }

  public static String readStream(InputStream instream) {
    try {
      byte[] buf = new byte[10];
      StringBuilder appender = new StringBuilder();
      int read;
      while ((read = instream.read(buf)) != -1) {
        for (int i = 0; i < read; i++) {
          appender.append((char) buf[i]);
        }
      }

      return appender.toString();
    }
    catch (NullPointerException e) {
      if (instream == null) {
        throw new TemplateError("null input stream", e);
      }
      else {
        throw e;
      }
    }
    catch (IOException e) {
      throw new TemplateError("unknown I/O exception while including (stacktrace nested)", e);
    }
  }
}