| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. The ASF licenses this file to You |
| * 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. For additional information regarding |
| * copyright in this work, please see the NOTICE file in the top level |
| * directory of this distribution. |
| */ |
| package org.apache.abdera2.common.templates; |
| |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.apache.abdera2.common.templates.Context; |
| import org.apache.abdera2.common.templates.Expression; |
| import org.apache.abdera2.common.templates.Operation; |
| |
| public class Expression |
| implements Iterable<Expression.VarSpec>, Serializable { |
| |
| private static final long serialVersionUID = 1457650843240079628L; |
| private static final Pattern EXPRESSION = Pattern.compile("([\\+\\#\\.\\/\\;\\?\\&\\=\\,\\!\\@\\|\\$\\(\\)])?(.*){1}"); |
| private static final Pattern VARSPEC = Pattern.compile("([^(?:\\:\\d+)\\*\\^]+)([(?:\\:\\d+)\\*\\^]+)?"); |
| private static final Pattern LENGTH = Pattern.compile("\\:(\\d+)"); |
| |
| private final String EXP; |
| private Operation op; |
| private List<VarSpec> varspecs = |
| new ArrayList<VarSpec>(); |
| |
| public Expression(String exp) { |
| this.EXP = exp; |
| parse(); |
| } |
| |
| public String toString() { |
| return EXP; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((EXP == null) ? 0 : EXP.hashCode()); |
| result = prime * result + ((op == null) ? 0 : op.hashCode()); |
| result = prime * result + ((varspecs == null) ? 0 : varspecs.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| Expression other = (Expression) obj; |
| if (EXP == null) { |
| if (other.EXP != null) |
| return false; |
| } else if (!EXP.equals(other.EXP)) |
| return false; |
| if (op == null) { |
| if (other.op != null) |
| return false; |
| } else if (!op.equals(other.op)) |
| return false; |
| if (varspecs == null) { |
| if (other.varspecs != null) |
| return false; |
| } else if (!varspecs.equals(other.varspecs)) |
| return false; |
| return true; |
| } |
| |
| public Operation getOperation() { |
| return op; |
| } |
| |
| public String evaluate(Context context) { |
| return getOperation().evaluate(this, context); |
| } |
| |
| public Iterator<Expression.VarSpec> iterator() { |
| return varspecs.iterator(); |
| } |
| |
| private void parse() { |
| Matcher mt = EXPRESSION.matcher(EXP); |
| if (mt.find()) { |
| this.op = Operation.get(mt.group(1)); // grab the operation |
| String varlist = mt.group(2); |
| if (varlist == null) |
| throw new IllegalArgumentException( |
| "Invalid Expression: No variables"); |
| String[] vars = |
| varlist.split("\\s*,\\s*"); |
| for (String var : vars) { |
| Matcher vt = VARSPEC.matcher(var); |
| if (vt.find()) { |
| VarSpec spec = new VarSpec(vt.group(1),vt.group(2)); |
| varspecs.add(spec); |
| } else { |
| throw new IllegalArgumentException( |
| "Invalid Expression: Invalid variable spec"); |
| } |
| } |
| } else { |
| throw new IllegalArgumentException("Invalid Expression"); |
| } |
| } |
| |
| |
| public static class VarSpec { |
| private final String name; |
| private final int length; |
| private final boolean explode; |
| private final boolean noval; |
| public VarSpec(String name, String modifier) { |
| this.name = name; |
| this.length = getLength(modifier); |
| this.explode = isExplode(modifier); |
| this.noval = isNoval(modifier); |
| } |
| private int getLength(String modifier) { |
| if (modifier == null || "".equals(modifier)) |
| return -1; |
| Matcher m = LENGTH.matcher(modifier); |
| if (m.find()) { |
| return Integer.parseInt(m.group(1)); |
| } else return -1; |
| } |
| private boolean isNoval(String modifier) { |
| return "^".equals(modifier); |
| } |
| private boolean isExplode(String modifier) { |
| return "*".equals(modifier); |
| } |
| public String getName() { |
| return name; |
| } |
| public int getLength() { |
| return length; |
| } |
| public boolean isNoval() { |
| return noval; |
| } |
| public boolean isExplode() { |
| return explode; |
| } |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + (explode ? 1231 : 1237); |
| result = prime * result + length; |
| result = prime * result + ((name == null) ? 0 : name.hashCode()); |
| return result; |
| } |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| VarSpec other = (VarSpec) obj; |
| if (explode != other.explode) |
| return false; |
| if (length != other.length) |
| return false; |
| if (name == null) { |
| if (other.name != null) |
| return false; |
| } else if (!name.equals(other.name)) |
| return false; |
| return true; |
| } |
| } |
| |
| } |