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

public final class AstEval extends AstNode {
  private final AstNode child;
  private final boolean deferred;

  public AstEval(AstNode child, boolean deferred) {
    this.child = child;
    this.deferred = deferred;
  }

  public boolean isDeferred() {
    return deferred;
  }

  public boolean isLeftValue() {
    return getChild(0).isLeftValue();
  }

  public boolean isMethodInvocation() {
    return getChild(0).isMethodInvocation();
  }

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

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

  @Override
  public String toString() {
    return (deferred ? "#" : "$") + "{...}";
  }

  @Override
  public void appendStructure(StringBuilder b, Bindings bindings) {
    b.append(deferred ? "#{" : "${");
    child.appendStructure(b, bindings);
    b.append("}");
  }

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

  public Object invoke(Bindings bindings, ELContext context, Class returnType, Class[] paramTypes, Object[] paramValues) {
    return child.invoke(bindings, context, returnType, paramTypes, paramValues);
  }

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

  public boolean isLiteralText() {
    return child.isLiteralText();
  }

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

  public void setValue(Bindings bindings, ELContext context, Object value) {
    child.setValue(bindings, context, value);
  }

  public int getCardinality() {
    return 1;
  }

  public AstNode getChild(int i) {
    return i == 0 ? child : null;
  }
}