JsonElementArray.java

package com.avaje.ebean.text.json;

import java.util.ArrayList;
import java.util.List;

/**
 * JSON Array element.
 * <p>
 * You will only use the JsonElements when you register a JsonReadBeanVisitor.
 * The JSON elements that are not mapped to a bean property are made available
 * to the JsonReadBeanVisitor.
 * </p>
 * 
 * @see JsonReadBeanVisitor
 * 
 * @author rbygrave
 */
public class JsonElementArray implements JsonElement {

  private final List<JsonElement> values = new ArrayList<JsonElement>();

  public List<JsonElement> getValues() {
    return values;
  }

  public void add(JsonElement value) {
    values.add(value);
  }

  public String toString() {
    return values.toString();
  }

  public boolean isPrimitive() {
    return false;
  }

  public String toPrimitiveString() {
    return null;
  }

  private String[] split(String exp) {
    int pos = exp.indexOf('.');
    if (pos == -1) {
      return new String[] { exp, null };
    }
    String exp0 = exp.substring(0, pos);
    String exp1 = exp.substring(pos + 1);
    return new String[] { exp0, exp1 };
  }

  public Object eval(String exp) {
    String[] e = split(exp);
    return eval(e[0], e[1]);
  }

  public int evalInt(String exp) {
    String[] e = split(exp);
    return evalInt(e[0], e[1]);
  }

  public String evalString(String exp) {
    String[] e = split(exp);
    return evalString(e[0], e[1]);
  }

  public boolean evalBoolean(String exp) {
    // TODO Auto-generated method stub
    return false;
  }

  private Object eval(String exp0, String exp1) {
    if ("size".equals(exp0)) {
      return values.size();
    }
    if ("isEmpty".equals(exp0)) {
      return values.isEmpty();
    }
    int idx = Integer.parseInt(exp0);
    JsonElement element = values.get(idx);
    return element.eval(exp1);
  }

  private int evalInt(String exp0, String exp1) {
    if ("size".equals(exp0)) {
      return values.size();
    }
    if ("isEmpty".equals(exp0)) {
      return values.isEmpty() ? 1 : 0;
    }
    int idx = Integer.parseInt(exp0);
    JsonElement element = values.get(idx);
    return element.evalInt(exp1);
  }

  private String evalString(String exp0, String exp1) {
    if ("size".equals(exp0)) {
      return String.valueOf(values.size());
    }
    if ("isEmpty".equals(exp0)) {
      return String.valueOf(values.isEmpty());
    }
    int idx = Integer.parseInt(exp0);
    JsonElement element = values.get(idx);
    return element.evalString(exp1);
  }

  public String getString() {
    return toString();
  }

}