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/*
 * Based on JUEL 2.2.1 code, 2006-2009 Odysseus Software GmbH
 *
 * 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.activiti.engine.impl.juel;

import org.activiti.engine.impl.javax.el.ELContext;
import org.activiti.engine.impl.javax.el.ELException;
import org.activiti.engine.impl.javax.el.MethodInfo;
import org.activiti.engine.impl.javax.el.ValueReference;

public final class AstText extends AstNode {
  private final String value;

  public AstText(String value) {
    this.value = value;
  }

  public boolean isLiteralText() {
    return true;
  }

  public boolean isLeftValue() {
    return false;
  }

  public boolean isMethodInvocation() {
    return false;
  }

  public Class getType(Bindings bindings, ELContext context) {
    return null;
  }

  public boolean isReadOnly(Bindings bindings, ELContext context) {
    return true;
  }

  public void setValue(Bindings bindings, ELContext context, Object value) {
    throw new ELException(LocalMessages.get("error.value.set.rvalue", getStructuralId(bindings)));
  }

  public ValueReference getValueReference(Bindings bindings, ELContext context) {
    return null;
  }

  @Override
  public Object eval(Bindings bindings, ELContext context) {
    return value;
  }

  public MethodInfo getMethodInfo(Bindings bindings, ELContext context, Class returnType, Class[] paramTypes) {
    return null;
  }

  public Object invoke(Bindings bindings, ELContext context, Class returnType, Class[] paramTypes, Object[] paramValues) {
    return returnType == null ? value : bindings.convert(value, returnType);
  }

  @Override
  public String toString() {
    return "\"" + value + "\"";
  }

  @Override
  public void appendStructure(StringBuilder b, Bindings bindings) {
    int end = value.length() - 1;
    for (int i = 0; i < end; i++) {
      char c = value.charAt(i);
      if ((c == '#' || c == '$') && value.charAt(i + 1) == '{') {
        b.append('\\');
      }
      b.append(c);
    }
    if (end >= 0) {
      b.append(value.charAt(end));
    }
  }

  public int getCardinality() {
    return 0;
  }

  public AstNode getChild(int i) {
    return null;
  }
}